METHOD FOR CONTINUOUSLY PREPARING CARBOXYLIC ACID ESTER
申请人:CHINA PETROCHEMICAL DEVELOPMENT CORPORATION
公开号:US20130303796A1
公开(公告)日:2013-11-14
A method for continuously preparing a carboxylic acid ester is disclosed. In the method of the present invention, a vertical reactor is filled with a solid catalyst, a carboxylic acid and an alcohol are introduced into a lower part of the vertical reactor, esterification is performed to form an esterized mixture, the esterized mixture is output from an upper part of the vertical reactor, and distillation is performed to isolate the carboxylic acid ester. The method of the present invention is simple, easily controlled and environmental friendly, and has significantly high conversion rate and selectivity.
Process for Production of Alkyl Tin Alkoxide Compound, and Process for Production of Carbonic Acid Ester Using the Compound
申请人:Shinohata Masaaki
公开号:US20100292496A1
公开(公告)日:2010-11-18
The present invention provides a process for producing: a compound represented by XOR
2
; a dialkyl tin dialkoxide compound having one tin atom, two Sn—R
1
bonds and two Sn—OR
2
bonds; and/or a tetraalkyl dialkoxy distannoxane compound having one Sn—O—Sn bond, in which each tin atom of the tetraalkyl dialkoxy distannoxane compound has two Sn—R
1
bonds and one Sn—OR
2
bond, the process comprising reacting in the absence of a catalyst at least one alkyl tin compound selected from the group consisting of i) and ii) below:
i) a dialkyl tin compound having one tin atom, two Sn—R
1
(wherein R
1
represents an alkyl group) bonds, and two Sn—OX bonds (wherein OX is a group in which HOX that is a conjugate acid of OX is a Bronsted acid having a pKa of from 0 to 6.8); and
ii) a tetraalkyl distannoxane compound having one Sn—O—Sn bond, in which each tin atom of the tetraalkyl distannoxane compound has two Sn—R
1
bonds and one Sn—OX bond (wherein OX is a group in which HOX that is a conjugate acid of OX is a Bronsted acid having a pKa of from 0 to 6.8); and
a carbonic acid ester represented by R
2
OCOOR
2
(wherein R
2
represents a linear or branched, saturated or unsaturated hydrocarbon group, a hydrocarbon group having a saturated or unsaturated cyclic hydrocarbon substituent, or a Y—CH
2
— group (wherein Y represents an alkyl polyalkylene group, an aromatic group or a cyclic saturated or unsaturated alkylene ether group)), and/or
an alcohol represented by R
2
OH (wherein R
2
is the same as defined above).
A Method for Esterification Reaction Rate Prediction of Aliphatic Monocarboxylic Acids with Primary Alcohols in 1,4-Dioxane Based on Two Parametrical Taft Equation
作者:Ján Vojtko、Peter Tomčík
DOI:10.1002/kin.20845
日期:2014.3
concentrations reaction rate depends only on the structure of reactants and, therefore, can be predicted by a correlationequation with two Taft coefficients (inductive and steric effects). From these equations, it is possible to estimate the esterification reaction rate constant for other acid‐alcohol pairs. This methodology may also be suitable for other kinetic systems measured under comparable experimental
[EN] PROCESSES FOR PRODUCING CARBOXYLIC ACIDS<br/>[FR] PROCÉDÉS DE PRODUCTION D'ACIDES CARBOXYLIQUES
申请人:EASTMAN CHEM CO
公开号:WO2020205348A1
公开(公告)日:2020-10-08
Processes are disclosed for preparing carboxylic acids from organic esters, the processes comprising contacting an ester with water in the presence of an acid catalyst and a homogenizing solvent at conditions effective to form a carboxylic acid. The homogenizing solvent is present in an amount sufficient to form a single-phase reaction mixture comprising the ester, water, and homogenizing solvent. The homogenizing solvent may be selected from acetonitrile, dimethyl sulfoxide, and 1,4-dioxane.
(Poly)glycerol monoethers were synthesized in good yield and selectivity by the catalytic reductive alkylation of glycerol, diglycerol, and triglycerol with readily available, cheap and/or bio‐sourced carboxylic acids. The reaction was catalyzed by 1 mol % of Pd/C under 50 bar H2 using an acid ion‐exchange resin as a recyclable cocatalyst. The catalytic system was recycled several times, and a mechanism
(聚)甘油单醚是通过甘油,二甘油和三甘油与现成的廉价和/或生物来源的羧酸的催化还原烷基化反应而合成的,具有良好的收率和选择性。使用酸性离子交换树脂作为可循环助催化剂,在50 bar H 2下以1 mol%的Pd / C催化反应。催化系统被回收了几次,并提出了这种转化的机理。