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methanol esterification
相关语句
  甲酯化
     Studies on Methanol Esterification of Soybean Deodirized Sludge
     豆油脱臭馏出物甲酯化处理的试验研究
短句来源
     The methanol esterification of rapeseed deodorizer distillate is an important process when phytosterol and vitamin E were separated applying molecular distillation.
     以菜籽油脱臭馏出物为原料利用分子蒸馏分离维生素E和甾醇,原料的甲酯化是重要步骤之一。
短句来源
  甲醇酯化
     Aiming at this situation, the research mostly does some research following: First, the method for determination of HAAs has been established according to US Environmental Protection Agency method 552.3(USEPA552.3), and it adopts liquid-liquid microextration combining acidity methanol esterification.
     针对此现状,本研究主要做了以下几方面的研究工作:首先参考美国USEPA552.3法,建立了卤乙酸的测定方法,即采用液液微萃取联合酸性甲醇酯化法。
短句来源
     In this short paper, various methods to manufacture methyl formate from methanol esterification, methanol dehydrogenation, methanol carbonylation, syngas direct synthesis were reviewed.
     介绍甲酸甲酯的合成方法,即甲醇酯化法、甲醇气相催化脱氢法、甲醇羰基化法、合成气直接合成法最新技术进展,并分析了这几种方法的优劣。
短句来源
  “methanol esterification”译为未确定词的双语例句
     It has been synthesized through substitution with methanol,esterification,chiral separation with valine,saponification,oxidation from the original material 1,2-cyclooxyhexane in total yield 14.32%.
     本研究工作设计以1,2环-氧环己烷为起始原料,经甲醇取代开环、酯化、缬氨酸手性拆分、皂化、氧化,得到光学纯的(S)-2甲-氧基环己酮,总收率14.32%.
短句来源
     Effects of the mole ratio of maleic anhydride to methanol,esterification time and isomerization temperature on the yield were studied and the optimal conditions were obtained. That is,the mole ratio of maleic anhydride to methanol was 6∶1,esterification time was 6 hours,isomerization temperature was 100℃. The final product was characterized by the infrared spectra and elemental analysis.
     通过精馏分水一锅法制备富马酸二甲酯 ,考察了醇酐比、酯化时间和异构化温度对产率的影响 ,确定了最佳反应条件为 :醇酐物质的量比为 6∶1,回流反应 6h ,异构化温度为10 0℃ ,利用红外谱图和元素分析对产物进行了表征。
短句来源
  相似匹配句对
     Studies on Methanol Esterification of Soybean Deodirized Sludge
     豆油脱臭馏出物甲酯化处理的试验研究
短句来源
     Esterification of Hyodexycholic Acid by Methanol under Microwave Irradiation
     微波辐射下猪去氧胆酸甲酯化反应
短句来源
     METHANOL CARBONYLATION
     甲醇羰基化
短句来源
     Study on the esterification
     酯化反应的探讨
短句来源
     On Esterification and Decolorizing of the
     黄水的酯化与脱色处理
短句来源
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  methanol esterification
In the esterification with ethanol, it was not possible to obtain pure esters as in methanol esterification, because the solubilities of oil components in ethanol were much higher than those in methanol.
      
A dramatic decrease in Cu(II)- and Zn(II)-binding resulted after acidic methanol esterification of the nonliving cells, indicating that carboxyl functional groups play an important role in the binding of metal to the biomaterial.
      
Two well-known derivatization procedures, H2SO4-butanol and H2SO4-methanol esterification, were compared for application to GC-MS identification of organic acids in Bayer process liquors.
      


Dimethyl fumarate was prepared from maleic anhydride and methanol with phospho-tungstic acid as the esterification catalyst and an oxidant of bromide as the isomerization catalyst by rectification to remove produced water. The influences of esterification time, the amount of esterification catalyst, the amount of isomerization catalyst, isomerization time and temperature have been investigated. The optimized reaction conditions were obtained as the follows: the mole ratio of maleic anhydride to methanol is...

Dimethyl fumarate was prepared from maleic anhydride and methanol with phospho-tungstic acid as the esterification catalyst and an oxidant of bromide as the isomerization catalyst by rectification to remove produced water. The influences of esterification time, the amount of esterification catalyst, the amount of isomerization catalyst, isomerization time and temperature have been investigated. The optimized reaction conditions were obtained as the follows: the mole ratio of maleic anhydride to methanol is 1∶8; the amount of phospho-tungstic acid is 6%(W/W)of the maleic anhydride, and esterification time is 4 h. Then superfluous methanol is removed by distillation. At 95~105 ℃, the isomerization catalyst is added. Its amount is 1.6%(W/W) of the maleic anhydride, and the reaction time is 30 min. The overall yield is over 77%. The rectification is an effective method of removing water for the methanol esterification. The esterification catalyst and the isomerization catalyst all have less corrosive effects to the equipment. The purification of the product is simple. No pollution happens. The mechanism of isomerization has been discussed as well.

以顺酐为原料 ,磷钨酸为酯化催化剂 ,一种含溴的氧化剂为异构化催化剂 ,通过精馏分水 ,一锅法合成富马酸二甲酯。考察了酯化时间、酯化催化剂用量、酐醇摩尔比、异构化催化剂用量、异构化温度、异构化时间等因素对反应产率的影响 ,并得到了最佳工艺条件 ,即顺n(酐 )∶n(甲醇 ) =1∶8,磷钨酸的用量为顺酐用量的 6% ,酯化回流 4h ,蒸出过量甲醇 ,然后加入顺酐用量 1 .6%的异构化催化剂 ,在 95~ 1 0 5℃温度下反应 3 0min ,产率超过 77%。精馏分水法较好地解决了甲酯化反应去水的问题 ;所采用的酯化催化剂和异构化催化剂对设备腐蚀较小 ,产品后处理简单 ,无三废。并且探讨了异构化机理

Methanol esterification is one of the most important steps in the process of natural vitamin E extraction using supercritical carbon dioxide from soybean deodorized sludge (SDS) , the esterification results showed that the important factors affecting the esterification ratio were the weight ratio of methanol and SDS, temperature and esterification time, sulfuric acid concentration had little influence , the best factor combination was that the weight ratio of methanol and...

Methanol esterification is one of the most important steps in the process of natural vitamin E extraction using supercritical carbon dioxide from soybean deodorized sludge (SDS) , the esterification results showed that the important factors affecting the esterification ratio were the weight ratio of methanol and SDS, temperature and esterification time, sulfuric acid concentration had little influence , the best factor combination was that the weight ratio of methanol and SDS was 0. 6, sulfuric acid 1%, temperature 80℃ and time 60 min, at this conditions, the highest esterification was 75. 59%. As to vitamin E maintenance, the most important factors were esterification temperature and time, the weight ratio of methanol and SDS, sulfuric acid concentration had minor affect. During esterification, 95. 82% of vitamin E can be kept.

以豆油脱臭馏出物为原料利用超临界CO_2提取维生素E,原料的甲酯化处理是重要的步骤之一,甲酯化结果表明,影响甲酯化的主要因素是甲醇与豆油脱臭馏出物的重量比例、酯化温度、酯化时间,而催化剂硫酸浓度的影响较小,最佳酯化因素组合是甲醇与豆油脱臭馏出物的重量比为0.6、硫酸浓度1%、酯化温度80℃、酯化时间60min,酯化率可达75.59%。而影响维生素E保存率的主要因素是酯化时间、酯化温度,甲醇与豆油脱臭馏出物的重量比例,硫酸浓度影响较小,在酯化过程中,维生素E的保存率最好可以达到95.82%。

Esterification is one of the most important steps in the process of natural vitamin E extraction using supercritical carbon dioxide from soybean deodorized distillate (SDD) . The common method is methanol esterification, but methanol is strongly toxic which gives much difficulty to the esterification process. The feasibility of ethanol esterification was studied in this paper. The results showed that the important factors affecting the esterification ratio were the weight ratio...

Esterification is one of the most important steps in the process of natural vitamin E extraction using supercritical carbon dioxide from soybean deodorized distillate (SDD) . The common method is methanol esterification, but methanol is strongly toxic which gives much difficulty to the esterification process. The feasibility of ethanol esterification was studied in this paper. The results showed that the important factors affecting the esterification ratio were the weight ratio of alcohol and SDD, esterification temperature and esterification time, while sulfuric acid concentration has a little influence. The best factor combination was: the weight ratio of alcohol to SDD 0.6, sulfuric acid concentration 1%, esterification temperature 80℃ and esterification time 60min, at this condition, the highest esterification ratio was 74.5%. As to vitamin E loss during esterification, the most important factors are esterification temperature and time, while the weight ratio of alcohol and SDD, sulfuric acid concentration had minor effect. During esterification, the minimum vitamin E loss was just 4.18%.

酯化处理是利用超临界CO_2从豆油脱臭馏出物中提取维生素E的重要步骤之一,常用甲酯化方法进行酯化处理,然而因甲醇有剧毒,处理过程有诸多不便。本文探讨了乙酯化处理的可能性。结果表明:影响乙酯化率的主要因素是乙醇与豆油脱臭馏出物的重量比例、酯化温度和酯化时间,催化剂硫酸浓度对其影响较小。最佳酯化因素组合是:乙醇与豆油脱臭馏出物的重量比例为0.6、硫酸浓度1%、酯化温度80℃、酯化时间60min,在此务件下,最高酯化率可达74.5%。影响维生素E损失率的最主要因素是酯化时间和酯化温度,乙醇与豆油脱臭馏出物的重量比例和硫酸浓度对其影响较小。在乙酯化过程中,维生素E损失的最小值为4.18%。

 
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