Using catalytic oxidative absorption for H_2S removal is of great interest due to its distinct advantages. However,traditional scrubbing process faces a great limitation in the confined space. Therefore, there is an u...Using catalytic oxidative absorption for H_2S removal is of great interest due to its distinct advantages. However,traditional scrubbing process faces a great limitation in the confined space. Therefore, there is an urgent demand to develop high-efficiency process intensification technology for such a system. In this article, H_2S absorption experimental research was conducted in a rotating packed bed(RPB) reactor with ferric chelate absorbent and a mixture of N_2 and H_2S, which was used to simulate natural gas. The effects of absorbent p H value, gas–liquid ratio, gravity level of RPB, absorption temperature and character of the packing on the desulfurization efficiency were investigated. The results showed that H_2S removal efficiency could reach above 99.6% under the most of the experimental condition and above 99.9% under the optimal condition. A long-time continuous experiment was conducted to investigate the stability of the whole process combining absorption and regeneration. The result showed that the process could well realize simultaneous desulfurization and absorbent regeneration, and the H_2S removal efficiency kept relatively stable in the whole duration of 72 h. It can be clearly seen that high gravity technology desulfurization process, which is simple, high-efficiency, and space intensive, has a good prospect for industrial application of H_2S removal in confined space.展开更多
A response surface modeling approach for simultaneous optimization of optical purity and yield was applied to the resolution of tartaric acid to study the effects of both the amount of the solvent and the amount of th...A response surface modeling approach for simultaneous optimization of optical purity and yield was applied to the resolution of tartaric acid to study the effects of both the amount of the solvent and the amount of the resolving agent a-methylbenzyl amine on the resolution results. The direction of changing the experimental conditions was determined from the initial response study, and expected high yield of the pure L(+)-tartaric acid-L(-)-a-methylbenzyl amine salt was obtained.展开更多
[Objective] The aim was to study the optimal test condition for preparation of active peptides from corn and soybean by bi-enzyme hy- drolysis. [Metbod]Taking soybean peptide and corn peptide as materials, different c...[Objective] The aim was to study the optimal test condition for preparation of active peptides from corn and soybean by bi-enzyme hy- drolysis. [Metbod]Taking soybean peptide and corn peptide as materials, different concentrations of soy-corn protein isolate solution were pre- pared. Through pretreatment, and based on compound protease, flavor protease, neutral protease, papaya protease, pineapple hydrolysis, and by measuring the degree of hydrolysis activity and enzyme activity, tested enzyme was determined. Mixing two of those enzymes in certain proportion and by orthogonal test, the optimal condition of enzyme hydrolysis of a double was determined. [ Result] The optimal hydrolysis condition was 2% of substrate concentration, 1 ： 1of hydrolyze compound protease and flavor protease, and 8 h of hydrolysis time, 75.14% of DH. [ Condasien] The study provided a basis for the development and application of active peptides from corn and soybean by bi-enzyme hydrolysis.展开更多
This study aimed to optimize the rapid test factors of dry basis weight of reconstituted tobacco, in order to afford a reference test method for companies which produce reconstituted tobacco to better control the basi...This study aimed to optimize the rapid test factors of dry basis weight of reconstituted tobacco, in order to afford a reference test method for companies which produce reconstituted tobacco to better control the basis weight and coating ratio on line. The dry basis weight of reconstituted tobacco was tested by fast method and normal oven method individually. And the effects on the test values of different test factors such as temperature, time and the number of baking sheets were studied. Then the test values of these two methods were compared, so the proper factors of rapid test method were determined. As the baking temperature rose from 130 ℃ to 150 ℃, and the baking time rose from 1 min to 2 min, the difference between fast test method and normal oven method grew, and when the number of baking pieces rose from 3 pieces to 5 pieces, the difference between the two methods went down. The optimum test condition was baking temperature of 130 ℃, baking time of 1 min, and baking sample sheet number of 5. Under this condition, the value of fast test method was the closest to the test value of normal oven method, and meanwhile, the test factor was more proper for testing on line. The study will provide a reference for online controlling of dry basis weight and coating ratio of reconstituted tobacco.展开更多
基金Supported by the National Natural Science Foundation of China(21406008)
文摘Using catalytic oxidative absorption for H_2S removal is of great interest due to its distinct advantages. However,traditional scrubbing process faces a great limitation in the confined space. Therefore, there is an urgent demand to develop high-efficiency process intensification technology for such a system. In this article, H_2S absorption experimental research was conducted in a rotating packed bed(RPB) reactor with ferric chelate absorbent and a mixture of N_2 and H_2S, which was used to simulate natural gas. The effects of absorbent p H value, gas–liquid ratio, gravity level of RPB, absorption temperature and character of the packing on the desulfurization efficiency were investigated. The results showed that H_2S removal efficiency could reach above 99.6% under the most of the experimental condition and above 99.9% under the optimal condition. A long-time continuous experiment was conducted to investigate the stability of the whole process combining absorption and regeneration. The result showed that the process could well realize simultaneous desulfurization and absorbent regeneration, and the H_2S removal efficiency kept relatively stable in the whole duration of 72 h. It can be clearly seen that high gravity technology desulfurization process, which is simple, high-efficiency, and space intensive, has a good prospect for industrial application of H_2S removal in confined space.
文摘A response surface modeling approach for simultaneous optimization of optical purity and yield was applied to the resolution of tartaric acid to study the effects of both the amount of the solvent and the amount of the resolving agent a-methylbenzyl amine on the resolution results. The direction of changing the experimental conditions was determined from the initial response study, and expected high yield of the pure L(+)-tartaric acid-L(-)-a-methylbenzyl amine salt was obtained.
基金Supported by Liaoning Education Bureau Scientific Research Support Fund(L2010203)Liaoning"Eleventh five-year plan"Education Science Fund Program(JG08DB133)The Seventh University Graduates Scientific Research Program of Liaoning Science and Technology University
文摘[Objective] The aim was to study the optimal test condition for preparation of active peptides from corn and soybean by bi-enzyme hy- drolysis. [Metbod]Taking soybean peptide and corn peptide as materials, different concentrations of soy-corn protein isolate solution were pre- pared. Through pretreatment, and based on compound protease, flavor protease, neutral protease, papaya protease, pineapple hydrolysis, and by measuring the degree of hydrolysis activity and enzyme activity, tested enzyme was determined. Mixing two of those enzymes in certain proportion and by orthogonal test, the optimal condition of enzyme hydrolysis of a double was determined. [ Result] The optimal hydrolysis condition was 2% of substrate concentration, 1 ： 1of hydrolyze compound protease and flavor protease, and 8 h of hydrolysis time, 75.14% of DH. [ Condasien] The study provided a basis for the development and application of active peptides from corn and soybean by bi-enzyme hydrolysis.
基金Supported by Science and Technology Planning Project of China Tobacco Schweitzer(Yunnan)Reconstituted Tobacco Co.,Ltd.(KY-17-ZL-01)China Tobacco Yunnan Industrial Co.,Ltd.(2016YL02)
文摘This study aimed to optimize the rapid test factors of dry basis weight of reconstituted tobacco, in order to afford a reference test method for companies which produce reconstituted tobacco to better control the basis weight and coating ratio on line. The dry basis weight of reconstituted tobacco was tested by fast method and normal oven method individually. And the effects on the test values of different test factors such as temperature, time and the number of baking sheets were studied. Then the test values of these two methods were compared, so the proper factors of rapid test method were determined. As the baking temperature rose from 130 ℃ to 150 ℃, and the baking time rose from 1 min to 2 min, the difference between fast test method and normal oven method grew, and when the number of baking pieces rose from 3 pieces to 5 pieces, the difference between the two methods went down. The optimum test condition was baking temperature of 130 ℃, baking time of 1 min, and baking sample sheet number of 5. Under this condition, the value of fast test method was the closest to the test value of normal oven method, and meanwhile, the test factor was more proper for testing on line. The study will provide a reference for online controlling of dry basis weight and coating ratio of reconstituted tobacco.
