Synthesis method of 1,3-propanediol-bis(4-nitrobenzoic acid)ester

A technology of p-nitrobenzoic acid and synthesis method, applied in the field of preparation 1, can solve the problems of complex operating conditions, large environmental pollution, and low purity, and achieve the effects of high product purity, easy-to-obtain raw materials, and high yield
CN102432486AInactive Publication Date: 2012-05-02HAINING CHONGSHUN CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HAINING CHONGSHUN CHEM
Publication Date
2012-05-02
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention discloses a synthesis method of 1,3-propanediol-bis(4-nitrobenzoic acid)ester. The synthesis method comprises the following steps: a) putting 1,3-propanediol and nitrobenzoic acid at a mol ratio of 1:(1.5-2.5) into a reaction kettle, heating to 130-150 DEG C, reacting for 6-8 hours, then heating to 180-200 DEG C and reacting for 5-8 hours; and b) adding a solvent and a catalyst into materials, introducing hydrogen gas to carry out hydrogenation reducing reaction at the temperature of 80-100 DEG C, filtering and recovering the catalyst immediately after reaction is finished, concentrating, then carrying out cooling crystallization, filtering and drying to obtain the 1,3-propanediol-bis(4-nitrobenzoic acid)ester product. The method disclosed by the invention has the characteristics of easily available raw materials, convenience in operation, high yield, high product purity, low cost and less produced three wastes, and is especially suitable for industrial production and is beneficial to environmental conservation.
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Description

technical field

[0001] The invention relates to a synthesis method for preparing 1,3-propanediol-bis(4-aminobenzoic acid) ester from p-nitrobenzoic acid. Background technique

[0002] 1.3 Propylene glycol-bis(4-aminobenzoic acid) ester is a colorless, odorless, tasteless crystal, hardly soluble in water, and is a safe and excellent performance amine curing agent, used for polyurethane prepolymer , The curing of epoxy resin will get products with excellent performance. The elastomer prepared by the reaction of 1.3 propylene glycol-bis(4-aminobenzoic acid) ester with TDI / polyether or polyester has excellent physical properties; it also has excellent chemical properties, such as hydrolysis resistance stability, resistance Dry / heat resistance, oil / solvent / humidity / ozone resistance, etc.

[0003] 1.3 Propylene glycol-bis(4-aminobenzoic acid) ester There are mainly two existing synthetic methods. One method is to synthesize by transesterification of methyl or ethyl p-aminobenzo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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