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Method for preparing SIPE from SIPA by direct esterification method

A technology of diethylene glycol isophthalate and isophthalic acid, which is applied in the field of preparing diethylene glycol isophthalate-5-sulfonate, can solve the problems of high methanol recovery cost, large equipment investment, Unfavorable environmental protection and other problems, to achieve the effect of eliminating large equipment investment, high purity and less by-products

Active Publication Date: 2008-09-17
厦门翔鹭化纤股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the by-product of this method is methanol, it must be recycled, otherwise it will cause damage to the environment. Therefore, there are disadvantages such as large equipment investment, high methanol recovery cost, and unfavorable environmental protection.

Method used

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  • Method for preparing SIPE from SIPA by direct esterification method

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment one, a kind of isophthalic acid-5-sulfonate (SIPA) direct esterification method of the present invention prepares the method for diethylene glycol isophthalate-5-sulfonate (SIPE), comprising:

[0035] a. Ingredients stage:

[0036] Put 9000g of ethylene glycol (EG) into the esterification reactor 1. Ethylene glycol is put into the esterification reactor 1 from the feeding port a, and the temperature is raised to 80°C. Then, press isophthalic acid-5-sulfonic acid Add the isophthalic acid-5-sulfonate (SIPA) into the molar ratio of salt (SIPA) and ethylene glycol (EG) at a ratio of 1:10, then start the agitator, put in the anti-ether agent and catalyst, the anti-ether agent It is sodium acetate, the input amount of sodium acetate is 2g, the catalyst is tetraisopropyl titanate, and the input amount of tetraisopropyl titanate is 4g; isophthalic acid-5-sulfonate (SIPA), sodium acetate, titanic acid Tetraisopropyl ester all is dropped in the esterification reaction...

Embodiment 2

[0045] Embodiment two, a kind of isophthalic acid-5-sulfonate (SIPA) direct esterification method of the present invention prepares the method for diethylene glycol isophthalate-5-sulfonate (SIPE), comprising:

[0046] a. Ingredients stage:

[0047] Put 9000g of ethylene glycol (EG) into the esterification reactor 1. Ethylene glycol is put into the esterification reactor 1 from the feeding port a, and the temperature is raised to 80°C. Then, press isophthalic acid-5-sulfonic acid Add the isophthalic acid-5-sulfonate (SIPA) into the molar ratio of salt (SIPA) to ethylene glycol (EG) at a ratio of 1:10, then start the agitator, put in the anti-ether agent and catalyst, the anti-ether agent It is sodium acetate, the input amount of sodium acetate is 2g, the catalyst is tetraisopropyl titanate, and the input amount of tetraisopropyl titanate is 4g; isophthalic acid-5-sulfonate (SIPA), sodium acetate, titanic acid Tetraisopropyl ester all is dropped in the esterification reaction ...

Embodiment 3

[0055] Embodiment three, a kind of isophthalic acid-5-sulfonate (SIPA) direct esterification method of the present invention prepares the method for diethylene glycol isophthalate-5-sulfonate (SIPE), comprising:

[0056] a. Ingredients stage:

[0057] Put 9000g of ethylene glycol (EG) into the esterification reactor 1. Ethylene glycol is put into the esterification reactor 1 from the feeding port a, and the temperature is raised to 80°C. Then, press isophthalic acid-5-sulfonic acid Add the isophthalic acid-5-sulfonate (SIPA) into the molar ratio of salt (SIPA) to ethylene glycol (EG) at a ratio of 1:10, then start the agitator, put in the anti-ether agent and catalyst, the anti-ether agent It is lithium acetate, the input amount of lithium acetate is 2g, the catalyst is n-tetrabutyl titanate, and the input amount of n-butyl titanate is 4g; isophthalic acid-5-sulfonate (SIPA), lithium acetate, n-tetrabutyl titanate The esters are all dropped into the esterification reaction ke...

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Abstract

The invention discloses a method of preparing m-phthalic acid diglycol ester-5-sulphonate by directly esterifying m-phthalic acid-5-sulphonate. The m-phthalic acid-5-sulphonate (SIPA) and glycol (EG) are used as raw material and are directly esterified to prepare the m-phthalic acid diglycol ester-5-sulphonate (SIPE); the esterification rate is more than 99 percent, the acid value is less than 1(mgKOH / g), and the content of diglycol (DEGA) is less than 2.0 percent. Therefore, the m-phthalic acid diglycol ester-5-sulphonate (SIPE) which is manufactured by adopting the method is almost esterified completely; the disadvantages of high equipment investment, high recovery cost of methanol, and going against environment protection are elminated when the m-phthalic acid diglycol ester-5-sulphonate (SIPE) is prepared by using dimethyl-m-phthalate-5-sulphonate (SIPM) through an interesterification method; the m-phthalic acid diglycol ester-5-sulphonate (SIPE) has the characteristics of low acid value, high purity, less byproducts, etc.; the m-phthalic acid diglycol ester-5-sulphonate (SIPE) is used as a dye modifier or a third monomer and is added in polyester, so that the mass-producing demand is achieved; the method is a preparation method with stable way and excellent quality.

Description

technical field [0001] The invention relates to a method for preparing diethylene glycol isophthalate-5-sulfonate by direct esterification of isophthalic acid-5-sulfonate. Background technique [0002] The polyester industry has developed rapidly in my country in recent years, and various enterprises are developing differentiated polyesters, which can be used as polyester dyeing modifiers and the third monomer diethylene glycol isophthalate- The research on 5-sulfonate (SIPE) is being carried out a lot. SIPE is suitable for the large-scale PTA process route to produce the third monomer of cationic dyeable polyester, which can endow CDP polyester fiber with good softness to cationic dyes , so that the dyed CDP fiber has bright color, complete color spectrum, fast coloring degree, good antistatic property, hygroscopicity and air permeability, and at the same time plays a role in reducing dyeing cost and improving environmental protection. But what report at present mostly is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/22C07C309/58
Inventor 陈耀南
Owner 厦门翔鹭化纤股份有限公司
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