Method for homogeneous synthesis of di (2-ethylhexyl) terephthalate

A technology of terephthalic acid and tetrabutyl titanate, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of human carcinogenesis and high energy consumption in the reaction process, and achieve improved efficiency, The effect of shortening the reaction time and reducing energy consumption
CN113233977AActive Publication Date: 2021-08-10JIANGNAN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGNAN UNIV
Publication Date
2021-08-10

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Abstract

The invention discloses a method for homogeneous synthesis of di (2-ethylhexyl) terephthalate, and belongs to the technical field of plasticizer DOTP preparation. According to the method disclosed by the invention, a specific and suitable solvent NMP is used, tetrabutyl titanate is taken as a catalyst, an acid alcohol raw material is catalyzed for esterification, reaction only needs 4 hours, the reaction acid value is reduced to 1mg KOH / g, and the esterification rate of the obtained product reaches 99%. Compared with a heterogeneous esterification reaction of DOTP without a solvent, the method has the advantages that the reaction time is shortened by half, the energy consumption of the reaction is greatly reduced, and the heat loss in the reaction process is reduced. According to the method, the existing heterogeneous reaction is converted into homogeneous reaction, the esterification reaction efficiency is greatly improved, the reaction time is shortened, an excellent esterification effect is achieved, and the method has a wide application prospect in industry.
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Description

technical field

[0001] The invention relates to a method for homogeneously synthesizing bis(2-ethylhexyl) terephthalate and belongs to the technical field of plasticizer DOTP preparation. Background technique

[0002] With the continuous development of the plasticizer industry, bis(2-ethylhexyl) terephthalate (DOTP) has gradually replaced diisooctyl phthalate (DOP) in recent years and has appeared in the public eye. However, the main problems in the current industrial preparation of DOTP are: the reaction is a heterogeneous reaction of solid-liquid mixing, its industrial reaction time is twice that of DOP, and the energy consumption of the reaction process is high.

[0003] However, there is no relevant mature technology to solve the problems of long esterification reaction time and high energy consumption of DOTP. The purpose of this patent is to find a suitable solvent to be used in the esterification reaction of DOTP to change the heterogeneous reaction into a homogeneou...

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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