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Esterification reaction accelerating method

A technology for esterification reaction and reaction kettle, which is applied in the field of accelerating esterification reaction, can solve the problems such as the inability to meet the needs of high-speed production of enterprises and the long time required, and achieve the effects of shortening the reaction period, reducing the reaction time, and heating up quickly.

Inactive Publication Date: 2017-08-11
苏州安利化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current DOTP preparation method takes a long time and cannot meet the high-speed production needs of enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] A method for accelerating esterification reaction, comprising the steps of:

[0019] 1) Configure the mixture with a mass ratio of phthalic acid:octanol=1:1.9-1:2.1;

[0020] 2) Add the mixture in step 1) into the reactor, and simultaneously monitor the temperature of the reactor in real time;

[0021] 31) When the kettle temperature is 197°C≥T≥205°C, control the excess alcohol at 53%-58%;

[0022] 32) When the kettle temperature is 205°C≥T≥225°C, control the excess alcohol at 23%-28%.

[0023] 4) In the mixture in the reactor, phthalic acid and octanol generate ester and water under the action of a catalyst.

[0024] In step 1), in the mixture, in terms of mass ratio, phthalic acid: octanol = 1:2.

[0025] In step 31), control excess alcohol at 55%.

[0026] In step 32), control excess alcohol at 25%.

[0027] Compared with the prior art, the method for accelerating the esterification reaction of the present invention has a rapid temperature rise in the early stag...

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PUM

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Abstract

The invention discloses an esterification reaction accelerating method. The method comprises the following steps that 1, a mixture is prepared according to the mass ratio of phthalic acid to octanol being 1:1.9 to 1:2.1; 2, the mixture in the step 1 is added into a reaction still, and the temperature of the reaction still is monitored in real time; 31, when the still temperature T is larger than or equal to 197 DEG C and smaller than or equal to 205 DEG C, excess alcohol is controlled to range from 53 % to 58 %; 32, when the still temperature T is larger than or equal to 205 DEG C and smaller than or equal to 225 DEG C, the excess alcohol is controlled to range from 23 % to 28 %; 4, in the mixture in the reaction still, phthalic acid and octanol generate ester and water under the action of a catalyst. Temperature rise is fast at the earlier stage and gentle later, the concentration of alcohol in the reaction solution is controlled at different temperature points, the reaction time is greatly shortened, the reaction period is shortened, the production efficiency is improved, and the heat energy utilization rate is increased.

Description

technical field [0001] The invention relates to the preparation technology of chemical products, especially the DOTP preparation technology, specifically, it shows a method for accelerating the esterification reaction. Background technique [0002] Plasticizer is a simple reaction between acid or acid anhydride and alcohol to form water and ester. At present, the commonly used plasticizer is DOTP (dioctyl terephthalate), which is the reaction between terephthalic acid and octanol as a catalyst. Ester and water are formed under the environment, because of the existence of solid-liquid, two-phase reaction; so the reaction is relatively slow. The preparation time of DOTP at this stage generally takes 6-8 hours. [0003] The current preparation method of DOTP takes a long time and cannot meet the high-speed production needs of enterprises. [0004] Therefore, it is necessary to provide a method for accelerating the esterification reaction to solve the above problems. Contents...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/82
CPCC07C67/08C07C69/82
Inventor 王刚
Owner 苏州安利化工有限公司