Process for preparing 5-sodium sulfo isophthalate

A technology of isophthalic acid and sodium sulfonate, applied in the preparation of sulfonic acid, organic chemistry, etc., can solve problems such as inability to solve quality and yield, and inability to industrialize production, so as to reduce raw material consumption, avoid pollution, and improve product yield. rate effect

Active Publication Date: 2006-08-23
潍坊德润化学有限公司
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Problems solved by technology

[0004] The problem existing at present is: for many years, many domestic production enterprises have been researching the production process of isophthalic acid-5-sodium sulfon

Method used

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  • Process for preparing 5-sodium sulfo isophthalate

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[0019] With reference to the drawings, the present invention will be further described:

[0020] According to a preferred molar ratio of 1:(1-1.5), isophthalic acid and fuming sulfuric acid are reacted in a sulfonation kettle at 150-200°C for 5-10 hours. After sampling reaches the end of sulfonation, the sulfonated material Put it in the neutralization kettle, reduce the temperature to 100-130℃, add deionized water, after cooling to room temperature, slowly add alkali, which can be sodium hydroxide, sodium carbonate, sodium bicarbonate, etc., fully stir the reaction and centrifuge. Add sodium sulfate and centrifugation to the mother liquor in the salting-out kettle, and the centrifugal material obtained is returned to the primary hot-melting kettle. The obtained salting-out mother liquor is extracted by adding toluene and sulfuric acid in the extraction kettle. The alkali is neutralized and recycled to the primary hot melt tank to recover the 5-sodium isophthalic acid 5-sulfonate;...

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Abstract

The present invention relates to chemical preparation process, and is especially preparation process of 5-sodium sulfo isophthalate. The preparation process includes the following steps: the first sulfonation reaction between isophthalic acid and fuming sulfuric acid; the subsequent neutralization of the reaction product with alkali; and refining the product through centrifugation, hot dissolving and drying. The present invention features the sulfonating agent of fuming sulfuric acid in certain concentration and the closed loop circulation of the mother liquid after refining product, and has no environmental pollution, high product yield up to 80 %, low material consumption and high product quality.

Description

1. Technical field: [0001] The invention relates to a chemical preparation method, in particular to a preparation method of isophthalic acid-5-sodium sulfonate. 2. Background technology: [0002] Sodium isophthalic acid-5-sulfonate, also known as: 5-(sodium sulfo)isotitanic acid, English code 5-SSIPA, is mainly used as an additive for water-soluble paints and an important dyeing modification for the production of cationic dyeable polyester It can also be used as an intermediate in the production of medicines and pesticides. [0003] Isophthalic acid-5-sodium sulfonate has two less methyl ester groups than isophthalic acid dimethyl-5-sodium sulfonate (SIPM), which is the direct neutralization and refining of isophthalic acid sulfonation without esterification owned. Dimethyl isophthalate-5-sodium sulfonate (SIPM) is used to produce polyester polyester. Before polymerization, it is first necessary to mix dimethyl isophthalate-5-sodium sulfonate (SIPM) with ethylene glycol T...

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Application Information

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IPC IPC(8): C07C303/06C07C309/58
Inventor 刘旭思隋福龙
Owner 潍坊德润化学有限公司
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