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Analysis of Ethylene Glycol Degumming Process and Characterization of Hemp Fibers 被引量:2
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作者 池虹 秦智慧 +3 位作者 赵树元 刘柳 张瑞云 程隆棣 《Journal of Donghua University(English Edition)》 CAS 2023年第3期255-260,共6页
To overcome the shortcomings of traditional degumming process,an efficient and environmentally friendly ethylene glycol(EG) degumming process was adopted to degum hemp fibers.The surface morphology,chemical compositio... To overcome the shortcomings of traditional degumming process,an efficient and environmentally friendly ethylene glycol(EG) degumming process was adopted to degum hemp fibers.The surface morphology,chemical composition,chemical structures,and mechanical properties of the fiber samples were analyzed to explore the mechanism of the degumming process.It was found that the EG degumming process could be divided into the main degumming stage(heating) and the supplementary degumming stage(insulation).The removal rates of hemicellulose and lignin in the main degumming stage were 70.56% and 60.17%,respectively.In the supplementary degumming stage,9.95% hemicellulose and 25.39% lignin were removed.It is confirmed that EG can separate hemp fibers effectively with less damage,which holds great potential for the biomass fiber separation technology. 展开更多
关键词 hemp fiber degumming process ethylene glycol(EG) HEMICELLULOSE LIGNIN
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Optimization for Microbial Degumming of Ramie with Bacillus subtilis DZ_(5) in Submerged Fermentation by Orthogonal Array Design and Response Surface Methodology 被引量:1
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作者 刘芬 陈杨栋 +2 位作者 朱鹏 曹张军 张兴群 《Journal of Donghua University(English Edition)》 CAS 2023年第5期475-481,共7页
As a kind of natural fiber,ramie fiber has distinctive advantages in textile application,but the application is limited due to the traditional degumming mode.Compared with the traditional degumming process,the microbi... As a kind of natural fiber,ramie fiber has distinctive advantages in textile application,but the application is limited due to the traditional degumming mode.Compared with the traditional degumming process,the microbial degumming process has many advantages.To obtain the optimal conditions for degumming ramie with Bacillus subtilis DZ_(5)(BS DZ_(5)),a combined statistical approach of orthogonal array design(OAD)and response surface methodology(RSM)was used.The influences of initial pH of the bacteria medium,culture temperature,shaking speed,degumming time and inoculum size on submerged fermentation degumming were evaluated by using fractional factorial design.The main factors in the analysis were culture temperature,shaking speed and initial pH.The residual gum mass fraction was used as the optimization index,and the optimal conditions for degumming were determined by central composite design and RSM.Thus with only a limited number of experiments,an optimal ramie microbial degumming condition was found as the culture temperature of 40℃,the initial pH in the culture medium of 8.5,the shaking speed of 205 r/min,the degumming time of 96 h and the inoculum size of 5%.After microbial degumming of ramie under the optimal conditions,there was only 10.6%residual gum by mass in the fiber.In addition,the effective degumming of BS DZ_(5)was also confirmed by a scanning electron microscope(SEM). 展开更多
关键词 microbial degumming OPTIMIZATION RAMIE orthogonal array design(OAD) response surface methodology(RSM)
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Production of Pectinolytic Enzymes by Two Bacillus spp. Strains and Their Application in Flax Degumming 被引量:2
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作者 Jingping Ge Zhiyu Yang +3 位作者 Renpeng Du Li Zhang Wenxiang Ping Dan Zhao 《Transactions of Tianjin University》 EI CAS 2019年第4期413-419,共7页
This study demonstrated that Bacillus licheniformis HDYM-03 and Bacillus megaterium HDYM-09, isolated from a liquid sample of fl ax retting pool, were able to produce pectinolytic enzymes using polysaccharides as subs... This study demonstrated that Bacillus licheniformis HDYM-03 and Bacillus megaterium HDYM-09, isolated from a liquid sample of fl ax retting pool, were able to produce pectinolytic enzymes using polysaccharides as substrates. Bacillus megaterium HDYM-09 produced pectin lyase that exhibited the highest activity of 2116.71 ± 11.55 U/mL. Bacillus licheniformis HDYM-03 produced pectate lyase that exhibited the highest activity of 611.21 ± 14.54 U/mL. Based on these fi ndings, we constructed four retting systems to degrade the pectin substance. The results showed that the content of galacturonic acid in the mixed system was 529.21 μg/mL, the content of reducing sugar was 98.14 mg/mL, and the weight loss ratio of cells reached 19.49%, which were signifi cantly higher than those in other systems. The mixed system has more advantages, and the utilization rate of degumming was higher, which further ensured that the degumming can be carried out effi ciently and quickly. The mixed system exhibits feasible applications in the fi ber and textile industry. 展开更多
关键词 FLAX degumming RETTING PECTIN Pectate Pectinolytic enzyme Fiber
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Degumming of Silk Fibers by CO<sub>2</sub>Supercritical Fluid 被引量:1
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作者 Chung-Haur Lo Yuchou Chao 《Journal of Materials Science and Chemical Engineering》 2017年第4期1-8,共8页
This paper is to study a new method to remove sericin from raw silk fiber. This new process is done using an organic acid as a pretreatment and then using CO2 supercritical fluid to remove sericin from silk fiber. Thi... This paper is to study a new method to remove sericin from raw silk fiber. This new process is done using an organic acid as a pretreatment and then using CO2 supercritical fluid to remove sericin from silk fiber. This method would be a huge break from the traditional environmentally unsustainable methods used today. This new processing method keeps the removed sericin in a clean state that can be used as a highly marketable silk protein in the medical and cosmetic industries. 展开更多
关键词 SILK SERICIN degumming CO2 SUPERCRITICAL Fluid
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Tentative Research of Short Process of Jute Degumming and Bleaching 被引量:2
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作者 王维明 王峰 +1 位作者 蔡再生 俞建勇 《Journal of Donghua University(English Edition)》 EI CAS 2008年第6期706-709,共4页
The feasibility of combination process of jute degumming and bleaching with alkali-hydrogen peroxide in one-step-one-bath was discussed. The combination process basically has the similar function as the traditional tw... The feasibility of combination process of jute degumming and bleaching with alkali-hydrogen peroxide in one-step-one-bath was discussed. The combination process basically has the similar function as the traditional two-step-two-bath method. The factors such as hydrogen peroxide concentration, CBI concentration, sodium hydroxide concentration, treatment time and temperature were studied respectively, and then an orthogonal experiment was designed to study the interactions among the hydrogen peroxide concentration, CBI concentration, sodium hydroxide concentration. After the designed experiments, the optimum treatment conditions were obtained as follows: hydrogen peroxide of 12g/L, sodium hydroxide of 4g/L, CBI of 4g/L, JFC of 1g/L, treatment time of 60min and temperature of 75℃. 展开更多
关键词 jute degumming bleaching one-step-one-bath
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Impact of Hydrogen Peroxide/Thiourea Redox Pretreatment on the Performances of Degummed Fibers for Apocynum Degumming
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作者 李长龙 王宗乾 +1 位作者 孙瑞霞 李昂 《Journal of Donghua University(English Edition)》 EI CAS 2012年第5期450-454,共5页
The degnmming pretreatment mechanism was investigated to improve degnmming performance and the spinnability of degummed fibers. Apocynum was treated with redox system in the degumming pretreatment process and the pret... The degnmming pretreatment mechanism was investigated to improve degnmming performance and the spinnability of degummed fibers. Apocynum was treated with redox system in the degumming pretreatment process and the pretreatment parameters had been optimized, besides the effects of pretreatment on property index of degnmmed apocynum fiber were investigated. The results showed that the redox system degumming process reduced alkali boiling time and had good advantages over the traditional degumming process in extraction rate, single fiber length and strength. SEM was used to test the longitudinal morphology changes of fibers before and after pretreatment. At the same time, pretreatment solution was analyzed by UV spectra and electron paramagnetic resonance spectrometer (ESR), and its pH value was also tested. The results showed that the pretreatment solution could release acid constantly to keep the stability of the pH which caused the swelling and dissolution of pectic substances in apocynum bast. Meanwhile, pretrcatment solution could activate the free radicals from apocynam bast and reduce the activation energy of non- cellulosic composition in apocynum bast. 展开更多
关键词 apocynum redox system degumming pretreatment free radical electron paramagnetic resonance spectrometer (ESR)
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Research of Degumming Process, Microstructure and Properties of Mulberry Fiber
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作者 张之亮 张元明 +1 位作者 郁崇文 喻红芹 《Journal of Donghua University(English Edition)》 EI CAS 2007年第2期170-172,共3页
More and more novel nature fibers are used in textiles. The natural fibers include banana fiber, pineapple fiber and bamboo fiber etc. In this paper, as a kind of novel natural fiber, mulberry fiber is studied. The ch... More and more novel nature fibers are used in textiles. The natural fibers include banana fiber, pineapple fiber and bamboo fiber etc. In this paper, as a kind of novel natural fiber, mulberry fiber is studied. The chemical component of mulberry bast is tested and analyzed. Meanwhile, the degumming method and process of mulberry bast are studied. Chemical degumming experiments to investigate the influence of alkali concentration, alkali boiling time and sodium phosphate tribasic ratio to material are conducted. Consequently, optimum parameters are obtained. The crystallinity of mulberry fiber is tested by using X-ray line, and the photos of scanning electron microscope (SEM) are observed. Testing results of the fiber properties (e. g. fineness, tenacity, length and elongation) show that mulberry fiber can be spun blend with cotton. 展开更多
关键词 mulberry fiber degumming process microstructure and properties
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Green Degumming of Silk by Enzyme Extracted from Natural Sources
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作者 Mahbubur Rahman Asim Bhowmik +2 位作者 Sudipta Das Kartick Chowhan Tanmoy Biswas 《Journal of Materials Science and Chemical Engineering》 2020年第8期30-40,共11页
The main objective of this work is to degum the silk with natural enzyme in lieu of conventional degumming to make it sustainable. Fibroin and sericin are the main composition of silk. Sericin provides a harsh and sti... The main objective of this work is to degum the silk with natural enzyme in lieu of conventional degumming to make it sustainable. Fibroin and sericin are the main composition of silk. Sericin provides a harsh and stiff effect of silk and decreases the valuable property like luster and whiteness and also leads to uneven dyeing. It is necessary to remove this sericin for the better post processing of silk. The removal process of sericin from silk is called degumming. Usually degumming process is done by using chemicals like soda (Na<sub>2</sub>CO<sub>3</sub>), detergent and other chemical staffs. But these chemicals are lethal to the environment. So, if such component found that can be substitute the fatal components and give the same required result or very close then that would be considered as an asset. This work deals with the different enzymes extracted from natural sources such as papaya skin, pineapple skin and guava leaf with variation of enzyme concentrations such as 10 (%), 15 (%) & 20 (%) as well as 35<span style="white-space:nowrap;">&#176;</span>C 45<span style="white-space:nowrap;">&#176;</span>C & 55<span style="white-space:nowrap;">&#176;</span>C temperatures that influence the degumming efficiency. By analyzing the various samples on the basis of degumming efficiency and other tests such as tensile strength, water vapor permeability, pilling and abrasion, crease recovery, whiteness test and spot test are done by standard method, it is found that the enzyme extracted from papaya skin shows the best degumming efficiency 15.9 (%) and other tests also show the good result at 15 (%) concentration and 45<span style="white-space:nowrap;">&#176;</span>C temperature whereas degumming efficiency 16.6 (%) for conventional process. From this work, it can be concluded that enzyme extracted from papaya skin can be substituted of conventional degumming which is also ecofriendly. 展开更多
关键词 degumming SILK ENZYME Pineapple Skin ECOFRIENDLY
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Properties and Processing of the Pineapple Leaf Fiber 被引量:1
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作者 Zhang Yuanming(张元明) +1 位作者 Yu Chongwen(郁崇文) 《Journal of Donghua University(English Edition)》 EI CAS 2001年第4期24-26,共3页
The properties and constituent of pineapple fiber were tested, and on the base of that, chemical treatment was used to improve the spinnability of the fiber, and the pure and blended yarn of pineapple fiber were produ... The properties and constituent of pineapple fiber were tested, and on the base of that, chemical treatment was used to improve the spinnability of the fiber, and the pure and blended yarn of pineapple fiber were produced in worsted and cotton spinning system. 展开更多
关键词 PINEAPPLE LEAF fiber bast fiber degumming spinning
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Production of Rice Bran Oil in India: a Technical Evaluation
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作者 Pradosh Prasad Chakrabarti Ram Chandra Reddy Jala 《粮油食品科技》 2021年第5期36-42,共7页
India has the highest utilization of rice bran oil in terms of the available resources in the country.Parboiled rice tradition has made the available rice bran in relatively good quality.This makes the quality of crud... India has the highest utilization of rice bran oil in terms of the available resources in the country.Parboiled rice tradition has made the available rice bran in relatively good quality.This makes the quality of crude rice bran oil being also high.Therefore the following processing is made relatively simple comparing with those high free fatty acid content crude rice bran oils.In India,physical refining is commonly used.Thus the oil refining yield is usually high.The unsaponifiable content is also higher comparatively.For example,oryzanol content is usually 1%to 1.5%in weight.Although there are a large number of rice bran oil small plants in India,the technology is relatively mature for the production of relatively good quality rice bran oil.In this short overview of the production technology of rice bran oil in India,the state of the art has been elaborated in a simple form.Particularly,the problems and challenges of the production technology have been evaluated with the background of decades of research and technology development work in India. 展开更多
关键词 rice bran oil in India enzymatic degumming physical refining DEWAXING BLEACHING membrane separation
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Study Rheological Behavior for Rapeseed Oils 被引量:1
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作者 Ioana Stanciu 《Journal of Chemistry and Chemical Engineering》 2013年第2期184-186,共3页
Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingh... Rheological behavior of this article presents rapeseed oil. Dynamic viscosity of rapeseed oil was determined at temperatures between 40 ℃-90 ℃ and shear rates ranging from 3.3-120 s1. All types of oils studied Bingham fluid behavior in the temperature range from 313-363 K. Correlation coefficients have similar values to one for all oils studied. 展开更多
关键词 Rheological behaviour rapeseed oil degummed rapeseed oil.
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