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Method for producing dioctyl terephthalate

A technology of dioctyl terephthalate and dioctyl phthalate, which is applied in the production field of dioctyl terephthalate, can solve the problems of slow esterification reaction speed, large production waste water, and high energy consumption, and achieve The effect of improving product quality

Inactive Publication Date: 2008-03-12
郭立耀 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, "the process of producing dioctyl terephthalate (DOTP) from terephthalic acid and isooctyl alcohol" is: esterification-dealcoholization-neutralization-washing-stripping-filtration, and there is an esterification reaction in this process Defects such as slow speed, low esterification rate, large production wastewater and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Put terephthalic acid and isooctyl alcohol into the esterification reaction kettle in a weight ratio of 1:2.3~2.8 (example 1:2.3, 1:2.6, 1:2.8), heat while stirring, when the temperature rises When the temperature reaches 160-220°C (for example, 160°C, 190°C, 220°C), add a catalyst corresponding to 0.2-2% of the total weight of terephthalic acid and isooctyl ester (for example, 0.2%, 1%, 2%), and ester The reaction temperature of the reaction is controlled between 180-260° C. (for example, 180° C., 220° C., 260° C.). When the acidity is ≤0.05%, the esterification reaction is considered to be over, and the step (2) is entered.

[0028] (2) distill out the esterified water and unnecessary alcohol in the material;

[0029] (3) After the temperature of the material treated in step (2) drops below 130°C, throw it into the filter kettle, add the porous material that plays the role of adsorption and decolorization, and stir for 0.5 to 2 hours (for example, 0.5 hours, 1.2 h...

Embodiment 2

[0036] The catalyst is mixed with the following compounds in weight percent:

[0037] (a) Titanium metal compound 65%

[0038] (b) Tin metal compound 30%

[0039] (c) Other metal compounds 5%. All the other are with embodiment 1.

Embodiment 3

[0041] The catalyst is mixed with the following compounds in weight percent:

[0042] (a) Titanium metal compound 80%

[0043] (b) Tin metal compound 10%

[0044] (c) Other metal compounds 10%. All the other are with embodiment 1.

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PUM

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Abstract

The present invention discloses a production method of the terephthalic dioctyl ester wherein the terephthalic acid and the isooctyl are put into the reactor; the catalyst is added for the esterification; the esterified water and the left alcohol are distilled from the materials; the porous material with the functions of adsorption and decolorization are added; the mixture is stirred and the product can be got after the filtration. The present invention has the little waste emission and the high-ester product.

Description

Technical field: [0001] The present invention relates to a kind of production method of dioctyl terephthalate. Background technique: [0002] Dioctyl terephthalate is an important polyvinyl chloride (PVC) resin plasticizer with excellent performance, which has excellent chemical stability, heat resistance, cold resistance, low volatility and high electrical insulation properties And other advantages, can be widely used in cables, PVC plastics, high-grade artificial leather, rubber products and other fields. [0003] At present, "the process of producing dioctyl terephthalate (DOTP) with terephthalic acid and isooctyl alcohol as raw materials" is: esterification-dealcoholization-neutralization-washing-stripping-filtration, and there is an esterification reaction in this process The disadvantages are slow speed, low esterification rate, large production wastewater and high energy consumption. Invention content: [0004] The object of the present invention is to provide a k...

Claims

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Application Information

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IPC IPC(8): C07C69/82C07C67/08C08K5/12
Inventor 郭立耀刘晓东徐晶
Owner 郭立耀
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