Analyzing solubility of acid gas and light alkanes in triethylene glycol

Physical solvents such as ethylene glycol （EG）, diethylene glycol （DEG）, and triethylene glycol （TEG） are commonly used in wet gas dehydration processes with TEG being the most popular due to ease of regeneration and low solvent losses. Unfortunately, TEG absorbs significantly more hydrocarbons and acid gases than EG or DEG. Quantifying this amount of absorption is therefore critical in order to minimize hydrocarbon losses or to optimize hydrocarbon recovery depending on the objective of the process. In this article, a new correlation that fully covers the operating ranges of TEG dehydration units is developed in order to determine the solubility of light alkanes and acid gases in TEG solvent. The influence of several parameters on hydrocarbon and acid gas solubility including temperature, pressure, and solvent content is also examined.

Preparation of Triethylene Glycol Maleate and Its Effect on Plasticization of Oxidized Starch

A plasticizer triethylene glycol maleate（TEG-MA） was synthesized. The dominated monoester of moderate hydrophobicity with apparent oil-water partition coefficient of 0.042 in the product was confirmed by acid value determination, HPLC and FTIR. Its plasticizing effect on oxidized starch was manifested by crystallization, aging behaviour, moisture absorption, and mechanical performance. X-ray diffraction data showed that the relative crystallinity of the plasticized starch decreased. Both the crystal and the crystallinity of starch films were rarely changed in aging. Moisture absorption relied on the ester content and relative humidity. The elongation at break increased significantly with plasticizer content more than 10% in the matrix.

Feasibility analysis and process simulation of CO_(2) dehydration using triethylene glycol for CO_(2) pipeline transportation

The operation of dehydration is very important in the process of gas transportation. This study aims to evaluate the application feasibility of CO_(2) dehydration using triethylene glycol, which is also called TEG for short. Aspen Plus software was used to simulate the dehydration process system of CO_(2) gas transportation using TEG dehydration. Parameter analysis and process improvement were carried out for the simulation of dehydration process. At first, a sensitivity analysis was conducted to analyze and optimize operating conditions of conventional CO_(2)-TEG dehydration process system. Subsequently, a recycle unit was introduced into the conventional CO_(2)-TEG dehydration process system, it can be found that the improved process system with the recycle unit has a higher CO_(2) recovery rate which was about 9.8% than the conventional one. Moreover, the improved process system showed excellent operation stability through the comparison of simulation results of several processes with various water contents in their feed gases. Although the energy consumption is increased by about 2%, the improved process was economically and technically feasible for the long-term availability of CO_(2) pipeline transportation. The simulated results showed that the improved CO_(2)-TEG process system has promising application prospects in CO_(2) dehydration of CO_(2) gas transportation with high stability.

Poly(thiourea triethylene glycol) as a multifunctional binder for enhanced performance in lithium-sulfur batteries

A mechanically strong binder with polar functional groups could overcome the dilemma of the large volume change during charge/discharge processes and poor cyclability of lithium-sulfur batteries(LSBs).In this work,for the first time,we report the use of poly(thiourea triethylene glycol)(PTTG)as a multifunctional binder for sulfur cathodes to enhance the performance of LSBs.As expected,the PTTG binder facilitates the high performance and stability delivered by the Sulfur-PTTG cathode,including a higher reversible capacity of 825 mAh g^(-1) at 0.2 C after 80 cycles,a lower capacity fading(0.123%per cycle)over 350 cycles at 0.5 C,a higher areal capacity of 2.5 mAh cm^(-2) at 0.25 mA cm^(-2),and better rate capability of 587 mAh g^(-1) at 2 C.Such superior electrochemical performances could be attributed to PTTG's strong chemical adsorption towards polysulfides which may avoid the lithium polysulfide shuttle effect and excellent mechanical characteristics which prevents electrode collapse during cycling and allows the Sulfur-PTTG electrode to maintain robust electron and ion migration pathways for accelerated redox reaction kinetics.

超重力技术在TEG脱水中的应用研究

文中通过建立传质模型研究了超重力技术在三甘醇脱水中的应用,探讨了超重力技术三甘醇脱水的原理及工艺流程。得出在天燃气脱水工艺中使用超重力机,在一定范围内提高超重力机的转速、增加三甘醇的流量或减少天然气的流量有利于加强气液反应过程的传质,可以提高天然气脱水的效率。

基于GA-BP神经网络预测凝析油对TEG溶液起泡性能的影响

凝析油是一种天然气伴生的轻质原油,不仅会对TEG脱水撬的运行效果造成不良影响,而且影响产品气的气质.为了研究凝析油对TEG溶液起泡性能影响的规律,以n-C_(5)、i-C_(5)、C_(6)、C_(7)、C_(8)、C_(9)和C_(10)模拟凝析油的各组成成分,测定不同凝析油组成对TEG溶液起泡性能的影响大小,并分析了其规律.利用GA-BP神经网络建立凝析油不利影响的预测模型,采用t检验法对实验真实值和模型预测值进行验证.结果表明了凝析油各组分对TEG溶液起泡能力影响大小排序如下:C_(9)>C_(7)>C_(10)>n-C_(5)>C_(8)>C_(6)>i-C_(5),实验真实值与模型预测值近似相等,且两者并无显著性差异,因此,采用GA-BP神经网络能够准确预测凝析油对TEG溶液起泡性能的不利影响.

制备液相色谱-离子色谱法测定二缩三乙二醇二硝酸酯(TEGDN)中阴离子杂质

为了测定含能增塑剂二缩三乙二醇二硝酸酯(TEGDN)中的阴离子杂质,采用制备液相色谱-离子色谱法对TEGDN 中的阴离子进行定性定量分析。考察了制备液相色谱实验中不同流动相比例、进样量、收集时间对TEGDN 中杂质阴离子的分离和收集效果的影响以及离子色谱实验中淋洗液体系和淋洗液流速对阴离子分离效果的影响。结果表明,优化后的制备液相色谱条件为:Eclipse XDB-C18 色谱柱(250 mm×9.4 mm,5.0 μm),流动相V 甲醇∶V 水=50∶50,流速1.5 mL·min^-1,检测波长210 nm,柱温30 ℃,进样体积0.25 mL;优化后的离子色谱条件为:Metrosep A Supp 5 型阴离子分析柱(250 mm×4.0 mm,5.0 μm),淋洗液Na2CO3(3.2 mmol·L^-1)/NaHCO3 (1.0 mmol·L^-1),流速0.7 mL·min^-1,抑制型电导检测器,柱温40 ℃,进样体积20 μL。在优化的制备色谱条件下,TEGDN 中的杂质阴离子得到有效分离和收集,在离子色谱测定中,各阴离子线性关系良好,相关系数均大于0.999,检出限为0.0025~0.0100 μg·mL^-1,精密度和重复性试验(n=6)的相对标准偏差均小于2.0%,平均加标回收率为95.5%~103.5%。该方法灵敏度高,重现性好,可用于测定TEGDN7 中的阴离子杂质。

The Role of Surfactant and Costabilizer in Controlling Size of Nanocapsules Containing TEGDMA in Miniemulsion

Nanocapsules with triethylene glycol dimethacrylate （TEGDMA） as core material and polyurethane as wall material used for self-healing bonding resin were prepared by interfacial polycondensation in miniemulsion. The influence of surfactant and costabilizer concentration on nanocapsules size and stability of nanocapsules was investigated. The size and its polydispersity of the nanocapsules were measured by light-scattering particle size analyzer. When the concentration of SDS were increased from 2.5wt% to 10wt%,the size decreases from 340.5 nm to 258.3 nm, PDI decreased from 0.210 to 0.111. As the concentration of HD increased, the size and PDI were both decreased, When reaching 10wt%,the size was 258.0 nm,PDI was 0.130. SDS and HD play important effect in synthesis of Nanocapsules containing TEGDMA.By changing the surfactant and costabilizer concentration it was possible to synthesize a wide variety of nanocapsules sizes. The performance and technical parameters of nanocapsules had been researched preliminarily, which built the solid foundation for the application to the self-repairing bonding resin.

水溶液中低代TEG—PAMAM树形分子存在下金纳米颗粒的制备

在水溶液中低代TEG—PAMAM树形分子存在时，用NaBH4还原HAuCI4制备出金纳米颗粒。用紫外可见吸收光谱（UV—Vis），红外光谱（FT-IR）和透射电子显微镜（TEM）对所制备的金纳米颗及其制备过程进行了表征，实验结果表明，以低代树形分子为模板，当HAuCI4与TEG—PAMAM物质量的比分别为2：1，1：1和1：2时，所制的金纳米颗粒的粒径分别为3．5±0．4nm，2．6±1．6nm和2．88±1．33nm，并且可在室温下储存数月。

TEG-NCS/NBS复合溶剂的络合萃取脱氮性能研究

采用三乙二醇(TEG)-氯代琥珀酰亚胺(NCS)和溴代琥珀酰亚胺(NBS)复合溶剂作为萃取剂,研究其分别对模型油中喹啉、吖啶、吡啶、吲哚、吡咯以及催化裂化柴油中氮化物的脱除性能。结果表明:复合溶剂可将模型油中碱性氮和非碱性氮完全脱除。对于碱性氮,纯TEG对模型油中喹啉等的脱除率只有85%左右,而TEG-NCS、TEG-NBS复合溶剂对模型油中碱性氮的脱除率却能达99.9%以上,超高的脱氮性能来自于NCS、NBS与碱性氮之间发生的强络合作用。对于非碱性氮,TEG对吲哚、吡咯的脱除率均能达到99%以上,说明TEG与非碱性氮之间存在较强的氢键作用,研究还发现TEG-NBS与吲哚能发生强烈的络合作用,通过红外、紫外和^(1)H-核磁共振等表征方法也进一步证实了上述这些相互作用。此外,复合溶剂对催化裂化柴油也表现出良好的脱氮性能。可见,对于萃取脱氮而言,TEG-NCS和TEG-NBS具有良好的应用前景。

海上平台三甘醇脱水装置故障分析及工艺优化

目的解决某海上平台三甘醇脱水装置无法达到脱水要求的问题。方法基于现场实际生产数据,采用HYSYS软件进行该工艺系统的模拟分析,找出该系统运行问题的原因。结果脱水塔入口天然气中水含量过高是影响脱水系统效果的主要因素,改造方案应考虑入口过滤分离器和重沸器改造两方面。结合平台实际情况,最终确定改造方案为更换入口过滤分离器滤芯与重沸器电加热器。改造后,在表压5.2 MPa下的干气水露点从6℃降至-23℃,达到预期效果,且为后续扩容预留了操作空间。结论该海上平台三甘醇脱水装置处理量无法达到设计值的原因可能是入口过滤分离器性能不达标导致脱水塔入口天然气中水含量过高,建议在进行三甘醇脱水装置工艺设计时,严控入口过滤分离器处理指标,并根据入口过滤分离器处理指标配套三甘醇脱水装置。

298.2 K下KCl在三甘醇-水体系中的热力学性质研究

电解质溶液的热力学性质是海卤水开发利用的重要基础。文章采用钾离子选择性电极(K-ISE)和氯离子选择性电极(Cl-ISE),组成电池:K−ISE|KCl(m),三甘醇(TEG)(w),H_(2)O(1−w)|Cl−ISE,测量了298.2 K时KCl在TEG+H_(2)O(TEG的质量分数wt%=0,0.10,0.20,0.30和0.40)混合溶剂中的电动势。通过Nernst方程分别与扩展的Debye-Hückel模型和Pitzer模型结合,得到了KCl+TEG+H_(2)O体系的热力学性质:活度系数(γ_(±))、标准迁移吉布斯自由能(△G■_(t))和原水化数(n_(hydr))。结果表明,扩展的Debye-Hückel和Pitzer模型均能准确描述该体系;氯化钾的活度系数随混合体系中KCl含量的增加而减小,随混合溶剂中TEG含量的增加而减小;△G■_(t)>0,说明KCl从水中迁移到(TEG+H_(2)O)混合溶剂的过程是非自发行为。研究结果为盐-混合溶剂体系提供了热力学数据。

气相色谱-串联质谱法同时测定牙膏中乙二醇、二甘醇、三甘醇

建立了气相色谱-串联质谱法(GC-MS)同时测定牙膏中乙二醇、二甘醇、三甘醇等3种醇类物质分析方法。牙膏样品经超纯水提取,加入无水乙醇抑制泡沫产生,采用溶剂放空进样模式,经气相色谱串联质谱检测,外标法对牙膏中醇类物质目标物进行定量。结果表明牙膏中3种醇类物质在聚乙二醇为固定相的毛细管柱上得到良好的分离,线性相关系数均大于0.995,回收率在86.7%~94.1%,检出限范围为0.18 mg/kg~0.20mg/kg,定量限范围为0.46 mg/kg~0.50 mg/kg。该方法简单,适用于牙膏中醇类物质的检测,为牙膏质量控制提供技术支持。

三甘醇脱水装置尾气回收治理技术研究

天然气开采过程使用三甘醇脱水装置吸收脱出天然气中的水分,其精馏柱尾气含有挥发性有机物(VOCs),目前主要采用分离吸附技术、焚烧炉焚烧和引射增压回收技术进行尾气处理。文章分析各类尾气处理技术的工艺流程、应用实例,对比了各类技术的优缺点、污染物排放和资源利用情况,推荐通过尾气治理实现VOCs减排和资源回收利用的水引射增压回收技术。

Thermal Decomposition Kinetics of Triethylene Glycol Dinitrate

The thermal behavior and kinetic parameters of the decomposition reaction of triethylene glycol dinitrate (TEGDN) in a temperature-programmed mode at different pressures (0.1, 2, 4 and 6 MPa) have been investigated by means of DSC and TG-DTG. The results show that the properties of the thermal decomposition of TEGDN are affected by the change of pressure, and the kinetic model function, the apparent activation energy Ea and pre-exponential factor A of this reaction are []122(1)ln(1)aa---, 106.54 kJ昺ol-1 and 109.17 s-1 at 0.1 MPa, and 120.82 kJ昺ol-1 and 1010.56 s-1 at 2 MPa, respectively. The critical temperature of thermal explosion of TEGDN obtained by the values Teo and Tpo of the onset temperature Te and the peak temperature TP when the heat-ing rate tends to zero are 191.05, 209.86 ℃ at 0.1 MPa, 207.59 and 221.65 ℃ at 2 MPa, respectively.

基于碳排放核算的天然气脱水系统优化

针对天然气脱水系统能耗和碳排放量较大的问题,通过HYSYS软件对典型三甘醇脱水工艺进行建模,基于能流分析对流程中的碳排放源进行识别,考察了不同因素对碳排放量的影响,并通过粒子群算法完成目标函数及决策变量的求解。结果表明,根据核算边界限制,可识别到的碳排放源为重沸器、再生气、循环泵和汽提气加热器,其中重沸器为燃料燃烧排放节点、再生气为工艺放空排放节点、循环泵和汽提气加热器为净购入电力排放节点;TEG循环量、重沸器温度、汽提气流量和吸收塔塔板数均对碳排放量产生一定影响,重沸器是排碳的主要设备。通过算法优化,重沸器的碳排放量降低最多,CO_(2)排放总量从38.43 kg/h降至31.59 kg/h,降幅17.8%,总能耗从49.47 kW降至41.50 kW,降幅16.1%,节能减排效果显著。

基于HYSYS的渤海某油田三甘醇脱水工艺优化实验研究

目的:解决某海上平台三甘醇脱水装置无法达到脱水要求的问题。方法:基于现场实际生产数据,采用HYSYS软件进行该工艺系统的模拟分析,并找出该系统运行问题的原因。结果:在项目开始初期由于进口天然气量较小,现场供给的汽提气量不足,三甘醇循环量提供较少是影响脱水系统效果的主要因素,改造方案应考虑汽提气量及三甘醇循环量两方面。结合平台实际情况,最终确定工艺调整方案。工艺调整后,在表压6.0 MPa下的干气水露点从-25.3℃降至-38.27℃,达到预期效果。结论:海上平台三甘醇脱水装置在最初开启时,由于进口天然气量较小,处理量无法达到设计值的原因可能是现场供给的汽提气量不足,三甘醇循环量提供较少,建议在进行三甘醇脱水装置工艺设计时,如发生干气水露点不达标的情况,可以适度提高优化汽提气用量,致使初期干气水露点达到理想条件。

催化法制备三乙二醇二异辛酸酯及其性能

采用沉淀-浸渍法制备SO_(4)^(2-)/ZrO_(2)-γ-Al_(2)O_(3)固体酸催化剂,以三乙二醇和2-乙基己酸的酯化反应为探针反应催化法制备三乙二醇二异辛酸酯(TGDE),确定SO_(4)^(2-)/ZrO_(2)-γ-Al_(2)O_(3)固体酸催化剂的最佳制备条件。考察焙烧温度、焙烧时间、硫酸浸渍浓度、硫酸浸渍时间、陈化温度对催化活性的影响,并进一步考察催化剂的循环使用性能。结果表明,焙烧温度为600℃、焙烧时间为5 h、硫酸浸渍浓度为0.6 mol·L^(-1),酸浸渍时间为9 h、陈化温度-20℃时,制备的SO_(4)^(2-)/ZrO_(2)-γ-Al_(2)O_(3)固体酸催化剂具有较好的催化活性,三乙二醇的酯化率达到99.06%,催化剂循环使用5次后,酯化率降至90.54%。目的产物TGDE进行气相色谱、FT-IR、^(1)HNMR和^(13)CNMR分析检测,各项性能指标都达到了国家标准。

Junction properties and conduction mechanism of new terbium complexes with triethylene glycol ligand for potential application in organic electronic device

Terbium-picrate triethylene glycol（EO3-Tb-Pic） complex was prepared in thin film and single layer device structure of ITO/EO3-Tb-Pic/Al, using spin coating technique. The UV-Vis absorption spectroscopy analysis was performed to evaluate the electronic molecular transition of the complex. The optical band gap, Eg estimated from the Tauc model revealed that EO3-Tb-Pic thin film exhibited a direct transition with Eg of 2.70 eV. The electronic parameters of the ITO/EO3-Tb-Pic/Al device such as the ideality factor n, barrier height Φb, saturation current Io, and series resistance Rs, were extracted from the conventional lnI-V, Cheung＇s functions and Norde＇s method. It was found that the evaluated parameters calculated from Norde＇s and Cheung＇s methods were consistent with those calculated from the conventional I-V method. In the double logarithmic I-V plot, three distinct regions based on the slope were identified, and the conduction mechanisms were discussed and explained. The mobility, μ value was estimated from SCLC region as 2.58×10^–7 cm2/（V·s）. This newly obtained lanthanide complex may be potentially utilized in electronic devices.

天然气三甘醇脱水装置重沸器烟管腐蚀特性研究

以重庆南川某脱水站为研究对象,对现场重沸器烟管进行了宏观形貌、金相、微观形貌及腐蚀产物分析,探究了烟管腐蚀失效机理,并提出了防治措施。结果表明:烟管外壁失效是由Cl^(-)引起的点腐蚀,同时弯管段叠加了空泡腐蚀。造成烟管外壁点腐蚀的主要原因是天然气中的Cl^(-)等盐类腐蚀介质进入了三甘醇溶液;造成烟管外壁空泡腐蚀的主要原因是重沸器罐内的三甘醇溶液在运行过程中曾出现过酸性变质或起泡变质失效,现场运行作业未能及时发现消除。烟管管体材料为20G普通碳钢,耐Cl^(-)点腐蚀和空泡腐蚀的能力较差,是造成腐蚀失效事故的次要原因。