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Prepn of fatty alcohol acetate

A technology of fatty alcohol ester and fatty alcohol, which is applied in the reaction preparation of ester group and hydroxyl group, organic chemistry, etc., can solve the problem of difficult transesterification reaction, etc., and achieve the effect of high efficiency

Inactive Publication Date: 2005-11-09
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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AI Technical Summary

Problems solved by technology

However, the preparation of the corresponding fatty alcohol acetate by transesterification of methyl acetate and fatty alcohol faces such a problem: the boiling point (54°C) of methyl acetate or its azeotrope formed with methanol is usually lower than that of the transesterification reaction system Therefore, in the transesterification process, the transesterification reaction is difficult to carry out due to the evaporation of methyl acetate in the reaction system
Therefore, conventional methods cannot make methyl acetate and other fatty alcohols undergo transesterification reactions to prepare corresponding fatty alcohol acetates.

Method used

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  • Prepn of fatty alcohol acetate
  • Prepn of fatty alcohol acetate

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Embodiment 1～4

[0020] Add a fatty alcohol with a purity of more than 95%, polyvinyl acetate and methyl acetate mixture (the content of methyl acetate is 60-85%) produced by methanolysis to produce polyvinyl alcohol, and add a mixture with reflux according to the required feeding ratio In the enamel reactor of the condenser, and add the required amount of catalyst. The reactant is heated to a suitable temperature under pressure with stirring. After a suitable reaction time, the reaction material is taken and the content of each component in the reaction product is detected by chromatographic analysis, and the reaction result is calculated. After the reaction is finished, the reaction product is separated and purified to obtain the corresponding fatty alcohol acetate product.

[0021] See Table 1 and Table 2 for specific fatty alcohol raw materials, catalysts and their consumption, and specific reaction conditions, and Table 3 for the reaction results.

[0022] fatty alcohol raw m...

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Abstract

The present invention is the preparation process of fatty alcohol acetate with methyl acetate and fatty alcohol as material. In the presence of catalyst, methyl acetate and fatty alcohol are made to produce ester exchange reaction at the reaction temperature of 70-180 deg.c and the reaction pressure of 0.15-2.0 MPa for 2-6 hr before the reaction material is rectified and separated to obtain product fatty alcohol acetate. The fatty alcohol may one of ethanol, propyl alcohol, isopropyl alcohol, butyl alcohol, isobutyl alcohol, amyl alcohol, isoamyl alcohol, hexyl alcohol, isohexyl alcohol, heptyl alcohol, isoheptyl alcohol, capryl alcohol and isocapryl alcohol. The present invention solves the technological problem that methyl acetate has boiling point lower than that of other matter in the ester exchange system and thus can not produce ester exchange reaction with other fatty alcohol.

Description

technical field [0001] The invention belongs to a method for preparing corresponding fatty alcohol acetate by transesterification reaction using methyl acetate and fatty alcohol as raw materials. Background technique [0002] At present, the industrialized production of polyvinyl alcohol is generally to prepare polyvinyl acetate first, and then alcoholyze polyvinyl acetate and methanol in alkaline aqueous solution to obtain polyvinyl alcohol. In this process, a large amount of by-product methyl acetate will be produced. The by-product methyl acetate exists as a mixture of methyl acetate, methanol, water and a small amount of impurities, wherein the content of methyl acetate is about 60-85%, the content of methanol is about 15-40%, and the content of water is about It is 0.5%-10%, and the impurity content is about 0.1-5%. Since the by-product methyl acetate is not high in purity and contains more methanol, it has little direct application value. Therefore, in the industry, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/03C07C69/12
Inventor 苏勇章洪良邓诗峰陶念曾刁春霞朱德成全继胜
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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