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Method for purifying 5-sulfosalicylic acid

A sulfosalicylic acid and purification method technology, applied in the field of 5-sulfosalicylic acid purification, can solve the problems of cumbersome operation, high cost, high energy consumption, etc., and achieve safe and convenient purification process and stable product quality Effect

Inactive Publication Date: 2011-10-19
TAICANG HUSHI REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by this invention is to provide a kind of purification method of 5-sulfosalicylic acid, to overcome the low purity of 5-sulfosalicylic acid purification product in the prior art, complex operation, large energy consumption and high cost insufficient

Method used

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  • Method for purifying 5-sulfosalicylic acid

Examples

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Effect test

Embodiment 1

[0020] Dissolve 100g of industrial grade 5-sulfosalicylic acid in 1000mL of deionized water, add 20g of activated carbon under stirring, keep the temperature at 42±2°C for 5 hours, filter to remove the activated carbon, and pass the obtained filtrate through the device at a flow rate of 10ml / min. There is a 1000g 4A molecular sieve separation column with a heating device, and the column temperature is kept at 75±5°C. The collected liquid is concentrated at 100°C and recrystallized to obtain 82.5g of the purified white crystalline product 5-sulfosalicylic acid. 99.1% purity.

Embodiment 2

[0022] Dissolve 100g of industrial grade 5-sulfosalicylic acid in 500mL of deionized water, add 10g of activated carbon under stirring, maintain the temperature at 50±2°C for 6 hours, filter to remove the activated carbon, and pass the obtained filtrate through the device at a flow rate of 15ml / min. There is a 1500g 4A molecular sieve separation column with a heating device, and the column temperature is kept at 85°C. The collected liquid is concentrated at 100°C and recrystallized to obtain 83.7g of purified white crystalline product 5-sulfosalicylic acid with a purity of 99.2 %.

Embodiment 3

[0024] Dissolve 100g of industrial grade 5-sulfosalicylic acid in 400mL of deionized water, add 10g of activated carbon under stirring, maintain the temperature at 58±2°C for 8 hours, filter to remove the activated carbon, and pass the obtained filtrate through the device at a flow rate of 20ml / min. There is a 1500g 4A molecular sieve separation column with a heating device, and the column temperature is kept at 95°C. The collected liquid is concentrated at 100°C and recrystallized to obtain 86.2g of purified white crystalline product 5-sulfosalicylic acid with a purity of 99.2 %.

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Abstract

The invention discloses a method for purifying 5-sulfosalicylic acid. The method comprises the following steps of: mixing industrial-grade 5-sulfosalicylic acid serving as a raw material and deionized water to obtain an aqueous solution of 5-sulfosalicylic acid, making the aqueous solution of 5-sulfosalicylic acid pass through active carbon and a 4A molecular sieve in sequence for secondary absorption purification, and collecting by using the common method to obtain the purified 5-sulfosalicylic acid. The purity of the 5-sulfosalicylic acid prepared by the method is more than 99 percent. Compared with the prior art, the method has the advantages that: the purification process is safe and simple, the energy is saved, the emission is reduced, the used active carbon and 4A molecular sieve can be activated to be recycled, and the requirements of green chemical engineering and environmental friendliness are met; and the purified 5-sulfosalicylic acid is stable in quality and has an industrialized production prospect.

Description

technical field [0001] The invention relates to a method for purifying 5-sulfosalicylic acid, in particular to a method for secondary purification of 5-sulfosalicylic acid with activated carbon and molecular sieves. Background technique [0002] 5-sulfosalicylic acid is referred to as sulfosalicylic acid, also known as 2-hydroxy-5-sulfobenzoic acid, the English name is 5-sulphosalicylic acid, mainly used in the manufacture of dyes, surfactants, catalysts, pharmaceutical intermediates and other fields. 5-sulfosalicylic acid is used in the dye industry as an intermediate for the manufacture of surfactants; in pharmaceutical intermediates, it is the raw material for various preparations such as doxycycline and methacycline; 5-sulfosalicylic acid Salicylic acid is also a color developer for metal ions, which can be used to determine manganese, lead and other metal ions. [0003] The structural formula of 5-sulfosalicylic acid is as follows: [0004] [0005] In the prior a...

Claims

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Application Information

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IPC IPC(8): C07C309/60C07C303/44
Inventor 王伟顾小焱吕明王永旗
Owner TAICANG HUSHI REAGENT
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