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A kind of preparation method of dioctyl terephthalate

A technology of dioctyl phthalate and terephthalic acid, applied in the field of polymer compounds, can solve the problems of dioctyl terephthalate taking a long time, high cost, large amount of catalyst, etc. The effect of improving quality and reducing production costs

Active Publication Date: 2020-04-14
佛山市高明晟俊塑料助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the common preparation process of dioctyl terephthalate is the direct esterification method of terephthalic acid, but this method is expensive, it takes a long time to prepare dioctyl terephthalate, and the amount of catalyst is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of preparation method of dioctyl terephthalate, specifically the following steps:

[0020] (1) Terephthalic acid pretreatment

[0021] Take the raw material terephthalic acid and place it in a freezer at -10°C for 60 minutes, then vacuum dehydrate it at 80°C until the water content is below 0.1%, and the vacuum degree is 0.01MPa, and set aside;

[0022] (2) Octanol pretreatment

[0023] Take the raw material octanol, freeze it at -15°C for 35 minutes, centrifuge to get the supernatant, and set aside;

[0024] (3) Catalytic reaction

[0025] Put the treated terephthalic acid and octanol in a reaction kettle with a molar ratio of 1:3, add octanol first, and then add terephthalic acid, which will help the raw materials to mix evenly and fully react, and then add Catalyst A with 0.5% terephthalic acid mass fraction is slowly heated, and a stirrer is used to continuously stir during the heating process, and the stirring speed is 30r / min; when the temperature in the...

Embodiment 2

[0031] A kind of preparation method of dioctyl terephthalate, specifically the following steps:

[0032] (1) Terephthalic acid pretreatment

[0033] Take the raw material terephthalic acid and place it in a freezer at -10°C for 80 minutes, then vacuum dehydrate it at 90°C until the water content is less than 0.1%, and the vacuum degree is 0.04MPa, and set aside;

[0034] (2) Octanol pretreatment

[0035] Take the raw material octanol, freeze it at -15°C for 45 minutes, centrifuge to get the supernatant, and set aside;

[0036] (3) Catalytic reaction

[0037] The treated terephthalic acid and octanol are placed in the reaction kettle in a molar ratio of 1.5:3.5, wherein octanol is added first, and then terephthalic acid is added to help the raw materials mix uniformly and fully react, and then add 1.1% catalyst A of the mass fraction of terephthalic acid, heat slowly, use a stirrer to continuously stir during the heating process, and the stirring speed is 45r / min; when the t...

Embodiment 3

[0043] A kind of preparation method of dioctyl terephthalate, specifically the following steps:

[0044] (1) Terephthalic acid pretreatment

[0045] Take the raw material terephthalic acid and place it in a freezer at -10°C for 70 minutes, then vacuum dehydrate it at 85°C until the water content is below 0.1%, and the vacuum degree is 0.03MPa, and set aside;

[0046] (2) Octanol pretreatment

[0047] Take the raw material octanol, freeze it at -15°C for 40 minutes, centrifuge to get the supernatant, and set aside;

[0048] (3) Catalytic reaction

[0049] The treated terephthalic acid and octanol are placed in the reaction kettle in a molar ratio of 1.2:3.3, wherein octanol is added first, and then terephthalic acid is added to help the raw materials mix uniformly and fully react, and then add Catalyst A with 0.8% terephthalic acid mass fraction is slowly heated, and a stirrer is used to continuously stir during the heating process, and the stirring speed is 40r / min; when th...

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PUM

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Abstract

The invention relates to a preparation method of dioctyl terephthalate. The dioctyl terephthalate is prepared by (1), pretreatment of terephthalic acid; (2), pretreatment of octyl alcohol; (3), catalytic reaction; (4), purification to obtain a finished product. Through experiment, the preparation method of dioctyl terephthalate greatly shortens the preparation time of dioctyl terephthalate by a TPA esterification method; the TPA esterification reaction can be completed for 5-7 hours by the prior art, but the preparation time of the invention only needs 3-5 hours through optimizing the catalyst type, the adding temperature and time; thus the production cost of enterprises is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer compounds, and in particular relates to a preparation method of dioctyl terephthalate. Background technique [0002] Dioctyl terephthalate (DOTP) is an excellent primary plasticizer for polyvinyl chloride (PVC) plastics. Compared with di-isooctyl phthalate (DOP), which is commonly used at present, it has the advantages of heat resistance, cold resistance, low volatility, anti-extraction, flexibility and good electrical insulation performance, and it shows excellent durability in products. , Soap water resistance and low temperature softness. Because of its low volatility, the use of DOTP can fully meet the temperature resistance level requirements of wire and cable, and can be widely used in 70°C resistant cable materials (International Electrotechnical Commission IEC standard) and various other PVC soft products. In addition to being widely used as a plasticizer for cable materials and PVC, DOT...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/82C07C67/08
CPCC07C67/08C07C69/82
Inventor 黄山明
Owner 佛山市高明晟俊塑料助剂有限公司