Catalyst for preparing acrylic acid and butyl ester using lactic acid method and preparation method thereof

By using biolactic acid and five components of catalysts for gas-solid phase reaction, the problem of propylene oxidation method's dependence on petroleum resources is solved, the efficient preparation of acrylic acid and its butyl ester is achieved, the production cost is reduced and the selectivity is improved.

CN101417232AActive Publication Date: 2009-04-29LIYANG CHANGDA TECH ZHUANYI CENT LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIYANG CHANGDA TECH ZHUANYI CENT LTD
Filing Date
2008-12-09
Publication Date
2009-04-29

AI Technical Summary

Technical Problem

The propylene oxidation method relies on non-renewable petroleum resources, resulting in a shortage of raw materials and rising production costs. Market demand continues to grow, and there is an urgent need for new acrylic acid and butyl ester preparation processes.

Method used

Bio-lactic acid is used as the initial raw material, and a gas-solid phase reaction is carried out through a five-component catalyst (main catalyst CaSO4 and co-catalyst CuSO4, Na2HPO4, NaH2PO4, La2O3 and H3PO4), the reaction temperature and pressure are reduced, and acrylic acid and its butyl ester are increased. selectivity and conversion rate.

Benefits of technology

It achieves highly selective conversion of butyl lactate into acrylic acid and its butyl ester, improves the raw material conversion rate and product selectivity of the reaction, reduces production costs, and avoids the risk of polymerization of acrylic acid derivatives.

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Abstract

The invention discloses a catalyst used for preparing acrylic acid and butyl ester by the dehydration of butyl lactate and a preparation method thereof. The catalyst is a composite catalyst, comprising a main catalyst A and auxiliary catalysts B, C, D and E, wherein, A is calcium sulphate, B is sulphuric acid, C is phosphate, D is alkaline matter and E is promoter. The preparation method comprises the steps as follows: five compositions A, B, C, D and E are sufficiently mixed, baked for 2-10 hours at the temperature of 200-800DEG C and formed for standby. The catalyst has high catalytic activation; under the catalysis of the catalyst, the molar yield reaches 75.1 percent and the molar selectivity of the acrylic acid and butyl ester reaches 71.5 percent. The preparation method has the advantages that the crystal structure of the main catalyst can be improved so as to be beneficial for carrying out the reaction; and the introduction of different auxiliary catalysts and quantities is helpful to improve the conversion ratio of the raw material and the product selectivity and is beneficial for improving the strength of the catalyst.
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