第1个回答 2010-03-12
A summary of issues in detail:
Describes the direct esterification of citric acid ester and indirect esterification of synthetic methods reviewed with emphasis on citric acid ester in the plasticizers, food additives, cleaning help Jing, cosmetics add Jing, Jing, etc. to help the textile applications. Also focused on an overview of citric acid ester surfactant as a detergent, cosmetic additives and food additives such as Industry; discussed the synthesis of citric acid ester of temperature, when asked, raw material ratio (molar ratio), catalyst type and the amount of such factors as the impact on yield; in particular pointed out the citric acid ester synthesis generate the importance of water removal and product separation and purification of the complexity; concludes with a synthesis of citric acid esters of the existing problems, development the direction and application prospects. On the citric acid ester plasticizer in the two main varieties of tributyl citrate (TBC), and acetyl tributyl citrate (A TBC) characteristics, uses outlined and discussed the industrial production and control. And the citric acid ester plasticizer in the two main varieties of tributyl citrate (TBC), and acetyl tributyl citrate (A TBC) characteristics, uses were summarized
Described and discussed the industrial production and control. As well as srn 1, kl, Composite solid acid catalyst used to catalyze the synthesis of citric acid esters, for catalyst preparation and esterification reaction conditions were studied The results show that. sn0 '1 A 0] Composite Solid Ether Catalyzed by Jing has good water, reuse and recycling performance. Optimum conditions for catalyst preparation: Sw'Al molar ratio of 1:3. Calcination temperature of 650 qC. Rao baking time 3 h: catalytic Taiwan into the citric acid isooctyl optimal conditions as follows: the amount of catalyst 12% (by total volume of acid to alcohol), acid-alcohol molar ratio l: 5. Reaction Time 2 h. Citric acid esterification rate of 99 4%.
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第2个回答 2010-03-12
Detailed questions:
Introduces citrate indirect and direct esterification of esterification synthesis methods are reviewed, focusing on citrate plasticizer, food additive, in design, the cosmetics to add grant washing thorns, and the thorns, etc. Also reviewed the citric acid ester surfactants as washing auxiliaries, cosmetic and food additive industrial application, Discuss the synthesis temperature, citrate, when the ratio of raw material (than) the amount of catalyst type and dosage, factors such as the effect of yield, Particularly pointed out in the synthesis of citrate water removal of the importance of the product and the complexity of the separation and purification, Finally proposed citrate synthesis of existing problems, the direction of development and application prospect. Just citrate plasticizer tributyl citrate (TBC) and acetyl tributyl citrate (TBC) properties and USES were reviewed, and discusses the industrialized production and control. And just citrate plasticizer tributyl citrate (TBC) and acetyl tributyl citrate (TBC) and USES of the generalized
Above, and discusses the industrialized production and control. And will SRN kl, and sets A solid acid catalyst used in catalytic synthesis of catalyst preparation, citric acid esters and esterification reaction conditions were studied. The results show that sn0 'A 0] after Taiwan solid ether catalytic subjects with good resistance to water, reuse and regenerated catalyst preparation condition. The best performance for Sw: 1) Al' mole ratio calcination temperature, curing time 650 qC Rao 3 h: citric acid catalytic Taiwan into the best condition of isooctyl catalyst for: 1 (2%), the total alcohol acid mellowly Moore j l: 5 than when asked 2 h. citrate esterification rate of 4% of 99.
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