Biochemical and physical investigations on detoxification of ginkgo kernel juice using probiotic fermentation with macroporous resin addition

The toxicity of ginkgo kernel is a global concern,restricting its consumption as a medicinal food.This study focuses on eliminating the toxic components,specifically ginkgolic acid,from ginkgo kernel juice.The approach used was probiotic fermentation with autochthonous lactic acid bacteria combined with macroporous resin.Compared to using lactic acid fermentation alone,adding macroporous resin during probiotic fermentation significantly enhanced the removal of toxic ginkgolic acid and 4'-O-methylpyridoxine from ginkgo kernel juice.After 48 h of fermentation with macroporous resin,the contents of ginkgolic acid and 4'-O-methylpyridoxine decreased by more than 69%and 61%,respectively.Interestingly,the adsorption of microbial growth inhibitors,such as ginkgolic acid,4'-O-methylpyridoxine,and phenolics,by the resin did not hinder the growth of lactic acid bacteria or their metabolic activities involving organic acids and monosaccharides.The study further confirmed that microbial adsorption was the primary reason for removing ginkgolic acid during probiotic fermentation.Also,the adsorption mechanism of ginkgolic acid during probiotic fermentation with macroporous resin was explored.From a mass transfer perspective,incorporating macroporous resin during the probiotic fermentation of ginkgo kernel juice reduced the mass transfer resistance for surface diffusion.Consequently,this lowered the contribution of surface diffusion to the overall diffusion process and facilitated the efficient removal of toxic ginkgolic acid.This work can help to understand the physical mechanism regarding detoxification of ginkgo kernel juice by probiotic fermentation,and offer potential strategies to enhance the safety of ginkgo kernel products.

Experimental and modelling study of the solubility of CO_2 in various CaCl_2 solutions at different temperatures and pressures

Study of the thermodynamic behaviour of CaCl2-H2O-CO2 systems is important in different scientific areas in the chemical and petroleum engineering fields. For example, a system including salt- H20-CO2 is a common system in CO2 geological storage. During carbonate matrix acidizing, this mixture also appears as the spent acid. Hence, study of the behaviour of this system and the solubility of CO2 in CaCl2 brine in different thermodynamic conditions is critical. In this study, CO2 solubility in 0, 1.90 and 4.80 mol/L CaCl2 solutions at 328.15 to 375.15 K and 68.9 to 206.8 bar were measured. These values are normal for oil reservoirs. A popular thermodynamic model is available in the literature for estimating the CO2 solubility in pure water and NaC1 solutions. In this paper, the available model was modified by experimental work to be applicable for CaCl2 as well. Based on the measured data, the component interaction parameters in the base model were adjusted for a CaCl2-H2O-CO2 system. The developed model could predict CO2 solubility in different conditions with remarkable accuracy, particularly for high concentration solutions and at high pressures. This improvement is up to 65% better than in the base model. This model can be used in Darcy scale models for predicting wormhole propagation during carbonate matrix acidizing.

Monitoring and Assessing of Spring Water Quality in Southwestern Basin of Jordan

This study was undertaken to assess the physical, chemical and hydrochemical quality of spring water in the southwestern basin of Jordan during a 60-month follow up monitoring study (April 2009 to April 2014). The samples were analyzed for temperature, conductivity, dissolved oxygen, pH, major cations, major anions and trace metals. The results show that there were considerable variations among the analyzed samples with respect to their physical and chemical parameters, which lie below the maximum permissible levels of the Jordanian and World Health Organization (WHO) drinking water standards. This study shows that the trace metals of spring water in the study area do not generally pose any health or environmental issues. The assessment of water samples indicates that groundwater, in general, is chemically suitable for drinking and agricultural uses.

Investigations into Optimization Models of Crude Oil Distillation Column in the Context of Feed Stock and Market Value

This paper proposes optimization models of crude oil distillation column for both limited and unlimited feed stock and market value of known products prices. The feed to the crude distillation column was assumed to be crude oil containing naphtha gas, kerosene, petrol and diesel as the light-light key, light key, heavy key and heavy-heavy key respectively. The models determined maximum concentrations of heavy key in the distillate and light key in the bottom for limited feed stock and market condition. Both were impurities in their respective positions of the column. The limiting constraints were sales specification concentration of light key in the distillate [ ], heavy key in the bottom [ ] and an operating loading constraint of flooding above the feed tray. For unlimited feed stock and market condition, the optimization models determined the optimum separation [ and ] and feed flow rate that would give maximum profit with minimum purity sales specification constraints of light key in the distillate and heavy key in the bottom as stated above. The feed loading was limited by the reboiler capacity. However, there is need to simulate the optimization models for an existing crude oil distillation column of a refinery in order to validate the models.

Synthesis and Optical Properties of InP Semiconductor Nanocombs

One-dimensional Ⅲ- Ⅴ semiconductor nanostruc- tures show fascinating applications in various fields. These materials have high electron mobil- ity, superior optical properties, and great flexibility in heterostructure design. When applied in ad- vanced nanodevices, the performance is highly de- pendent on the morphology and crystal structure of the nanostructures. Therefore, the full understand- ing and control of crystal structures and morpholo- gies are of importance to develop such applications. As a typical Ⅲ-Ⅴ semiconductor, InP is an especially attractive target for nanowires research due to its extensive uses in various fields. InP nanostructures with different morphologies, such as quantum dots, nanospheres, nanowires, and nanotubes, have been successfully synthesized. However, the facile syn- thesis of InP semiconductor with comb-like morpholo- gies have rarely been reported.

Modelling of microbial enhanced oil recovery application using anaerobic gas-producing bacteria

Microbial enhanced oil recovery （MEOR） methods apply injection of bacteria to depleted oil reservoirs to produce oil, which had remained unrecovered after the conventional methods of production. The ability ofthermophilic anaerobic bacteria to produce gas as the main mechanism in potential MEOR in high salinities of 70-100 g/L was investigated in this study. Maximum gas production of up to 350 mL per 700 mL of salty solution was produced at a salinity of 90 g/L stably during 2-4 days of experiment. The experimental results were upscaled to the Snorre Oilfield, Norway, and simulated using ECLIPSE software for 27 months. The best scenarios showed that the increase in oil recovery on average was at 21% and 17.8% respectively. This study demonstrated that anaerobic bacteria used in biogas plants could be an attractive candidate for MEOR implementation due to their ability to withstand high temperature and salinity, and produce gas in large volumes.

A Comparative Study on Hemp(Cannabis sativa)Essential Oil Extraction Using Traditional and Advanced Techniques

A comparative study of Cannabis sativa(Hemp)essential constituents obtained by using Supercritical Fluid Extraction(SCFE),Steam Distillation(SD)and Hydrodistillation(HD)is presented here.The optimized extraction temperatures were 130,110and 50℃for hydrodistillation,steam distillation and supercritical fluid extraction respectively.The essential oil of C.sativa was analyzed by using Gas chromatography mass spectrometry(GC-MS).A total of 33,30and 31components have been identified in HD,SD and SCFE respectively.Yield of essential oil using SCFE(0.039%)was more than HD(0.025%)and SD(0.035%)extraction respectively.The main component of sesquiterpenes obtained by hydrodistillation at 130℃with their percentages included caryophyllene(40.58%),trans-α-bergamotene(5.41%),humulene(10.97%),cis-β-farnesene(8.53%)and monoterpenes includedα-pinene(2.13%),d-limonene(6.46%),p-cymol(0.65%)and cineole(2.58%)respectively.The main component of sesquiterpenes obtained by SD steam distillation at110℃including caryophyllene(38.60%)trans-α-bergamotene(4.22%),humulene(10.26%),cis-β-farnesene(6.67%)and monoterpenes includedα-pinene(3.21%),d-limonene(7.07%),p-cymol(2.59%)and cineole(3.88%)whereas the more percentages of major components were obtained by SCFE at 50℃included caryophyllene(44.31%),trans-α-bergamotene(6.79%),humulene(11.97%)cis-β-farnesene(9.71%)and monoterpenes includedα-pinene(0.45%),d-limonene(2.13%)p-cymol(0.19%)and cineole(1.38%)respectively.We found yield/efficiency,chemical composition,quality of the essential oils by supercritical fluid extraction superior in terms of modern,green,saving energy and a rapid approach as compared to traditional techniques.

Enhanced near-zero-CO2-emission chemicals-oriented oil production from coal with inherent CO2 recycling: Part I—PRB coal fast pyrolysis coupled with CO2/CH4 reforming

In this study,the Powder River Basin(PRB)coal fast pyrolysis was conducted at 700°C in the atmosphere of syngas produced by CH4-CO2 reforming in two different patterns,including the double reactors pattern(the first reactor is for syngas production and the second is for coal pyrolysis)and double layers pattern(catalyst was at upper layer and coal was at lower layer).Besides,pure gases atmosphere including N2,H2,CO,H2-CO were also tested to investigate the mechanism of the coal pyrolysis under different atmospheres.The pyrolysis products including gas,liquid and char were characterized,the result showed that,compared with the inert atmosphere,the tar yield is improved with the reducing atmospheres,as well as the tar quality.The hydrogen partial pressure is the key point for that improvement.In the atmosphere of H2,the tar yield was increased by 31.3%and the contained BTX(benzene,toluene and xylene)and naphthalene were increased by 27.1%and 133.4%.The double reactors pattern also performed outstandingly,with 25.4%increment of tar yield and 25.0%and 79.4%for the BTX and naphthalene.The double layers pattern is not effective enough due to the low temperature(700°C)in which the Ni-based catalyst was not fully activated.

An improved correlation to determine minimum miscibility pressure of CO2–oil system

An accurate and reliable estimation of minimum miscibility pressure(MMP) of CO2-oil system is a critical task for the design and implementation of CO2 miscible displacement process.In this study,an improved CO2-oil MMP correlation was developed to predict the MMP values for both pure and impure CO2 injection cases based on ten influential factors,i.e.reservoir temperature(TR),molecular weight of C7+oil components(MWC7+),mole fraction of volatile oil components(xvol),mole fraction of C2-C4 oil components(xC2-C4),mole fraction of C5-C6 oil components(xCs-5-C6),and the gas stream mole fractions of CO2(yCO2),H2S(yH2S),C1(yC1),hydrocarbons(yHC)and N2(yN2).The accuracy of the improved correlation was evaluated against experimental data reported in literature concurrently with those estimated by several renowned correlations.It was found that the improved correlation provided higher prediction accuracy and consistency with literature experimental data than other literature correlations.In addition,the predictive capability of the improved correlation was further validated by predicting an experimentally measured CO2-Oil MMP data,and it showed an accurate result with the absolute deviation of 4.15%.Besides,the differential analysis of the improved correlation was analyzed to estimate the impact of parameters uncertainty in the original MMP data on the calculated results.Also,sensitivity analysis was performed to analyze the influence of each parameter on MMP qualitatively and quantitatively.The results revealed that the increase of xC2-C4,xC5-C6 and yH2 S lead to the decrease of MMP,while the increase of TR,MWC7+,xvol,yCO2,YC1,yHC and yN2 tend to increase the MMP.Overall,the relevance of each parameter with MMP follows the order of TR> xC5-C6> MWC7+> xvol> yH2 S> yHC> yCO2>yC1>yN2>xC2-C4.

二氧化硅纳米流体在储集层微粒运移控制中的应用

利用SiO_2纳米流体开展岩心驱替实验,通过注入SiO_2纳米流体改变孔壁的表面性质,加强颗粒与孔壁间的吸引力,克服水动力排斥力,以提高临界流速,控制储集层中微粒运移、提高注液速度。在注水过程中注入SiO_2纳米颗粒控制微粒的运移,有助于设计更高的产/注液速度。驱替实验结果表明质量分数为0.1%的SiO_2纳米流体控制微粒运移的性能最好,可将微粒运移量降低80%。增加注入流体的盐度并不能改善纳米流体控制微粒运移的性能。通过测量岩心表面的Zeta电位,得知SiO_2纳米颗粒由于带负电荷不能改变孔壁上的Zeta电位。原子力显微镜(AFM)分析证明,控制微粒运移的主要机理是SiO_2纳米流体增加了孔壁的粗糙度,需要更大的水动力才能使多孔介质中的微粒开始移动。对于所有实验都计算了微粒上的总作用力和扭矩,理论结果与实验结果吻合,计算结果表明微粒主要以滚动机理从孔壁脱落。

Catalyst design strategies towards highly shape-selective HZSM-5 for paraxylene through toluene alkylation

With the shape selective zeolite catalyst,toluene alkylation with methanol to para-xylene(MTPX)technology could produce highly pure para-xylene(PX)in one step.The lower feedstock cost and less energy consumption in products separation make it more competitive compared to the current toluene disproportionation route.Thus,MTPX is regarded as the most reasonable production route for PX production.This article reviews the strategies that applied to the preparation of high-performance catalysts for MTPX,with special focus on the precise control of pore dimension and acid sites distribution in zeolite to achieve the highest selectivity to PX.The outlook of the MTPX catalyst is also proposed to guide the catalyst development in the field.

铂和HF掺杂的H-ZSM-5分子筛催化甲苯与甲醇烷基化反应(英文)

Toluene was alkylated with methanol in a flow type reactor at temperatures between 300 and 500 °C using H-ZSM-5 zeolite, 0.2%Pt/H-ZSM-5 and hydrofluorinated 0.2%Pt/H-ZSM-5 with HF concentrations of 1.0%, 2.0%, 3.0%, or 4.0%. Pt primarily enhances toluene conversion, total xylenes production, and p-xylene relative to its thermodynamic equilibrium. As the concentration of HF increases from 1.0% to 3.0%, the catalyst activity increases because of the increase in the number of acid sites and their strength. Additionally, the surface area and Pt dispersion also increases. An advantage of increased HF doping is that the formation of voluminous trimethylbenzene (TMB) byproducts is inhibited. However, at a HF concentration of 4.0%, Al and Si are partially leached and then deposited mostly in the wider catalytic pores. This was determined by evaluating the pore volume distribution and we determined that reactivity inhibition was ob-viously present and was due to diffusion restriction.

碳纳米管二氧化钛复合材料作为可见光活性光催化剂对DBT的光氧化（英文）

近年来液体燃料中硫的脱除越来越重要。加氢脱硫是脱除硫的常用方法,但用这种方法消除噻吩类化合物比较困难。光催化法是目前正在开发的一种环境条件下脱除噻吩的替代方法。在半导体中,二氧化钛作为光催化剂显示出了良好的潜力;然而,电子空穴的快速复合阻碍了它的工业应用。降低复合率的一种方法是将碳纳米管与半导体结合起来。本文以正丁酸四乙酯(TEOT)和四异丙醇钛(TTIP)为前驱体,制备了不同质量比的纳米碳管(MWCNT)/二氧化钛复合材料。研究了在有氧和无氧条件下,二苯并噻吩(DBT)对正己烷的光催化去除作用。结果表明,当氧化钛与氧化钛之比为1时,去除效果最好。当比值超过此数时,由于光散射而使DBT去除率降低。TEOT制备的复合材料在DBT去除率方面表现出较好的效果。结果表明该复合材料是一种可见光活性光催化剂,在含氧条件下表现出较好的性能。光催化去除DBT的动力学为一级反应,在最佳条件下得到的去除速率常数为0.7 h^(–1)。

A comparative study of biopolymers and alum in the separation and recovery of pulp fibres from paper mill effluent by flocculation

Recovery of cellulose fibres from paper mill effluent has been studied using common polysacchatides or biopolymers such as Guar gum, Xanthan gum and Locust bean gum as flocculent. Guar gum is commonly used in sizing paper and routinely used in paper making. The results have been compared with the performance of alum, which is a common coagulant and a key ingredient of the paper industry. Guar gum recovered about 3.86 mg/L of fibre and was most effective among the biopolyrners. Settling velocity distribution curves demonstrated that Guar gum was able to settle the fibres faster than the other biopolymers; however, alum displayed the highest particle removal rate than all the biopolymers at any of the settling velocities. Alum, Guar gum, Xanthan gum and Locust bean gum removed 97.46%, 94.68%, 92.39% and 92.46% turbidity of raw effluent at a settling velocity of 0.5 cm/min, respectively. The conditions for obtaining the lowest sludge volume index such as pH, dose and mixing speed were optimised for guar gum which was the most effective among the biopolymers. Response surface methodology was used to design all experiments, and an optimum operational setting was proposed. The test results indicate similar performance of alum and Guar gum in terms of fioc settling velocities and sludge volume index. Since Guar gum is a plant derived natural substance, it is environmentally benign and offers a green treatment option to the paper mills for pulp recycling.

Conversion of CO into CO_(2) by high active and stable PdNi nanoparticles supported on a metal-organic framework

The solubility of Pd(NO_(3))_(2) in water is moderate whereas it is completely soluble in diluted HNO_(3) solution. Pd/MIL-101(Cr) and Pd/MIL-101-NH_(2)(Cr) were synthesized by aqueous solution of Pd(NO_(3))_(2) and Pd(NO_(3))_(2) solution in dilute HNO_(3) and used for CO oxidation reaction. The catalysts synthesized with Pd(NO_(3))_(2) solution in dilute HNO_(3) showed lower activity. The aqueous solution of Pd(NO_(3))_(2) was used for synthesis of mono-metal Ni, Pd and bimetallic PdNi nanoparticles with various molar ratios supported on MOF. Pd_(70)Ni_(30)/MIL-101(Cr) catalyst showed higher activity than monometallic counterparts and Pd+ Ni physical mixture due to the strong synergistic effect of PdNi nanoparticles, high distribution of PdNi nanoparticles, and lower dissociation and desorption barriers. Comparison of the catalysts synthesized by MIL-101(Cr) and MIL-101-NH_(2)(Cr) as the supports of metals showed that Pd/MIL-101-NH_(2)(Cr) outperforms Pd/MIL-101-(Cr) because of the higher electron density of Pd resulting from the electron donor ability of the NH_(2) functional group. However, the same activities were observed for Pd_(70)Ni_(30)/MIL-101(Cr) and Pd_(70)Ni_(30)/MIL-101-NH_(2)(Cr), which is due to a less uniform distribution of Pd nanoparticles in Pd_(70)Ni_(30)/MIL-101-NH_(2)(Cr) originated from amorphization of MIL-101-NH_(2)(Cr) structure during the reduction process. In contrast, Pd_(70)Ni_(30)/MIL-101(Cr) revealed the stable structure and activity during reduction and CO oxidation for a long time.

A study of the performance of the LSWA CO2 EOR technique on improvement of oil recovery in sandstones

Low salinity water is an emerging enhanced oil recovery(EOR)method that causes wettability alteration towards a favorable state to reduce residual oil saturation,while water alternating gas(WAG)is a proven EOR process that enhances oil recovery by controlling mobility of both water and gas.Therefore,combining the two EOR processes as low salinity water-alternating CO2 EOR injection(LSWA CO2)can further improve oil recovery by promoting the synergy of the mechanisms underlying these two methods.Core flooding experiments,contact angle,interfacial tension(IFT),and CO2 solubility measurement in oil and brine were conducted to investigate the viability and performance of LSWA CO2 in sandstone reservoirs.A favorable wettability alteration,along with IFT reduction and mobility control,are the mechanisms that contribute to residual oil mobilization efficiencies during the LSWA CO2 EOR process.In addition,LSWA CO2 core flooding experiments result in a significant incremental oil recovery.Three smart waters were tested in our research,to examine the impact of changing cationic composition on oil recovery.The solutions are designed brines as NaCl(SW1),MgCl2(SW2),and KCl(SW3).Of the three solutions,SW1 yields the highest incremental oil recovery and highest IFT reduction.In addition,it results in a favorable wettability alteration towards a more water-wet state.In all cases,introducing CO2 to the brine/oil system shows a great advantage in terms of enhancing wettability modification,promoting IFT reduction,and controlling the displacement front of the injected fluid through mobility control.

Advances in diamond nanofabrication for ultrasensitive devices

This paper reviews some of the major recent advances in single-crystal diamond nanofabrication and its impact in nano-and micromechanical,nanophotonics and optomechanical components.These constituents of integrated devices incorporating specific dopants in the material provide the capacity to enhance the sensitivity in detecting mass and forces as well as magnetic field down to quantum mechanical limits and will lead pioneering innovations in ultrasensitive sensing and precision measurements in the realm of the medical sciences,quantum sciences and related technologies.

Sand production control mechanisms during oil well production and construction

Sand production is considered as one of the significant production issues that significantly reduce wellbore productivity.The process of sand or solids production in production operations is one of the crucial operational inefficiencies that can lead to wells collapsing.Besides,the drilling mud might erupt through the formation.Therefore,it is essential to properly determine what types of solids or sand are produced to correctly predict efficient sand control mechanisms.This paper aimed to compare different sand production control mechanisms and how to control or minimize sand production.Moreover,we consider injection pressure and sand moisture on the sand production rate.According to this study’s findings,pressure injection and moisture increase had caused sand production increase,which should be considered in operational performances.Furthermore,chemical injection such as resin and hydrogel injection usually has efficient sand production control methods.An expandable sand screen is an expandable three-layer component that is driven into the well and expanded.

Experimental study on using SiO_(2) nanoparticles along with surfactant in an EOR process in micromodel

Surfactant flooding is a common chemical method for enhancing oil recovery.Recently,the simultaneous application of nanoparticles and chemical substances has been considered for improving the efficiency of EOR processes.In the present study,the microscopic and macroscopic efficiency of oil recovery in a linear micromodel in three injection cases of Sodium dodecyl sulfate(SDS)as an anionic surfactant,SiO_(2) nanoparticles,and simultaneous injection of nanoparticles and surfactant was investigated.In our study,adding the nanoparticles along with SDS(2000 ppm)decreased Interfacial tension by 84%,while the figure was 74%and only 10%when the surfactant and the nanoparticles were used alone,respectively.Seemingly,although the nanoparticles alone could not reduce IFT values,adding them to surfactant solution could strongly decrease the interfacial tension between oil and water,leading to enhancement of oil recovery.However,our findings showed that an optimum concentration of nanoparticles in surfactant solution must be used.In this regard,in low concentrations of nanoparticles,they were attached to the interface and IFT decreased due to absorption process.Nevertheless,in high concentrations,nanoparticles removed the surfactant from aqueous phase resulting in no free surfactant available in the bulk.Therefore,surfactant effectiveness in reducing IFT and alteration wettability decreased,and as a consequence,oil recovery efficiency dropped compared to lower nanoparticles’concentrations.Moreover,the results of sessile drop experiments and wettability measurements revealed that coating with either the surfactants or the nanoparticles could partially alter the wettability of surface to water-wet,while coating with the surfactants along with the nanoparticles could make a strongly water-wet surface.Seemingly,investigating the microscopic images of pores and throats showed a strong water-wet condition when the surfactant along with the nanoparticles was used.In addition,the results of flooding tests demonstrated that adding the nanoparticles to surfactant solution could increase the ultimate oil recovery significantly.Moreover,microscopic images confirmed that adding the nanoparticles to the surfactant solution can lead to forming oil-in-water and water-in-oil micro-emulsions due to ultra-low IFT.Obviously,this can result in improving the effectiveness of injection fluid to influence a wider range of porous media.