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Method for improving quality of plasticizer

A technology of product quality and plasticizer, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems such as the inability to remove light boilers in time, affecting the separation effect of the tower, deepening the color of the product, etc. The effect of product color and luster, reducing production cost and improving product quality

Inactive Publication Date: 2013-03-06
HENAN QIRUI BIOLOGICAL TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process meets the requirements of the manufacturer to a certain extent, but there are still deficiencies: one is that the light boiling substances produced in the reaction process and the light boiling substances in the recovered alcohol cannot be removed in time, which will deepen the color of the product and affect the product quality; During the alcohol reflux process, the alcohol (containing light boiling substances) refluxed into the tower is prone to flushing, which affects the separation effect of the tower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Put 15t of phthalic anhydride, 18.6t of butanol and 170kg into 50m according to the original formula 3 The esterification reactor carries out the esterification reaction;

[0022] Step 2: after the esterification reaction, neutralize, dealcoholize, press filter, refine to obtain the product, recover the unreacted alcohol in the reactor, calculate the amount of recovered butanol to be 3.6t, and add 15t of fresh butanol.

[0023] Step 3: According to the original formula, first put 15t of phthalic anhydride, 15t of added fresh butanol, and 170kg of catalyst into the 50m 3 In the esterification reaction kettle, when the temperature in the esterification kettle reaches 130°C, the recovered alcohol preheated to 100°C is sprayed in batches from the top of the esterification tower in the form of atomization, and the heating is continued. The internal temperature reaches 140°C for reflux reaction, the acid value drops to 1.8 mgKOH / g after 3~4 hours of esterification re...

Embodiment 2

[0025] Embodiment 2 is the same as embodiment 1 and will not be repeated, the difference is that the preheating temperature of alcohol recovery in step 3 is 105 ° C.

Embodiment 3

[0027] The same parts of Example 3 and Example 1 will not be repeated, the difference is that in step 3, the temperature in the esterification tank reaches 145° C. for reflux reaction.

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Abstract

The invention discloses a method for improving quality of a plasticizer. The method comprises the steps of: putting acid or anhydride, alcohol and a catalyst with a certain formula in a reaction kettle, wherein the raw material alcohol comprises 75-85 percent of fresh alcohol and 15-25 percent of recycled alcohol (containing 30-50 percent of light end), putting the acid or the anhydride, the fresh alcohol and the catalyst in an esterification reaction kettle, spraying recycled alcohol preheated to 100-105 DEG C from the top of an esterification tower step by step in an atomizing manner when the temperature in the esterification reaction kettle reaches 130-135 DEG C, and removing the light end to lower the possibility that unsaturated light end participates in the reaction and reduce color of a reaction product ester. The method has the advantages of realizing dual efficiencies by one tower during production of the plasticizer, improving separation effect of the tower, increasing the separation function of the tower, reducing the color of the plasticizer, increasing the quality grade of the plasticizer, lowering the cost and increasing the benefit.

Description

technical field [0001] The invention belongs to the technical field of plasticizer production, and in particular relates to a method for improving the quality of plasticizer products. Background technique [0002] At present, the esterification production process of plasticizer products such as phthalates, citric acid esters and fatty acid esters in industry usually uses phthalic acid (or phthalic anhydride), citric acid and fatty acids, etc. Acid chemical raw materials react with alcohol chemical raw materials. This reaction is a high-temperature reversible reaction. During the reaction process, a large amount of light boilers and water are formed. If they are not removed in time, the product quality will be seriously affected. Therefore, in order to reduce product color and improve product quality in the industry, light boiling substances and water should be removed as much as possible during the general reaction process. At present, most domestic manufacturers use alcoho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/80
Inventor 张祖礼马红飞赵许博陈永战
Owner HENAN QIRUI BIOLOGICAL TECH DEV
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