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Method for manufacturing naphthalene sulfonic acid

A manufacturing method and technology of naphthalenesulfonic acid, applied in the preparation of sulfonic acid, organic chemistry, etc., can solve the problems of poor reaction stability, high cooling energy consumption, long reaction time, etc., and achieve stable reaction, good product quality and high production efficiency Effect

Inactive Publication Date: 2007-10-03
SINOLIGHT CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process SO 3 It is gap-type feeding, poor reaction stability, many by-products (disulfonate and trisulfonate), long reaction time for production in a tank reactor, and high energy consumption for heating and cooling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 6.3kg / hr molten naphthalene and SO 3 The mixed gas with 0.16Mpa pressure of 3.0v% gas is introduced into the membrane reactor at 50.1kg / h, and the material naphthalene descends along the tube wall, and the imported SO 3 Gas contact, instant reaction, using jacket cooling water to control the reaction temperature 90-110 ℃, the reactant is continuously transported to the aging device, the isomerization temperature is controlled at 150-180 ℃, the isomerization time is 2 hours, can be Obtain 9.9 kg of naphthalenesulfonic acid products with a purity of β-naphthalenesulfonic acid of 90%, and the tail gas of the reaction is passed into a gas treatment facility. By-products include unreacted naphthalene, α-naphthalenesulfonic acid, polysulfonic acid, etc.

Embodiment 2

[0020] 18.9kg / hr molten naphthalene and SO 3 The mixed gas with 0.16Mpa pressure of 5.0v% gas is introduced into the tubular reactor at 93.1kg / h. The material naphthalene descends along the tube wall, contacts with the imported SO3 gas, and reacts instantaneously. The reaction temperature is controlled by jacket cooling water at 90 -110°C, the reactant is continuously sent to the aging device, the isomerization temperature is controlled at 150-180°C, the isomerization time is 2 hours, and the naphthalenesulfonic acid product with a purity of β-naphthalenesulfonic acid of 92% can be obtained per hour 29.7 kg, the tail gas of the reaction is passed into the gas treatment facility. By-products include unreacted naphthalene, α-naphthalenesulfonic acid, polysulfonic acid, etc.

Embodiment 3

[0022] 21.0kg / hr methylnaphthalene and the mixed gas of 0.16Mpa pressure containing SO3 gas 10.0v% are imported into the shell and tube reactor at 50.4kg / h, and the material methylnaphthalene descends along the tube wall, and contacts with the imported SO3 gas, The reaction occurs instantly, and the jacket cooling water is used to control the reaction temperature at 40-80°C. The reactants are continuously transported to the aging device, the isomerization temperature is controlled at 160-190°C, the isomerization time is 2 hours, and β- The purity of methylnaphthalenesulfonic acid is 32.1kg of β-methylnaphthalenesulfonic acid product of 70%, and the tail gas of the reaction is passed into the gas treatment facility. By-products include unreacted methylnaphthalene, α-methylnaphthalenesulfonic acid, polysulfonic acid, etc.

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PUM

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Abstract

The invention discloses a method for manufacturing naphthalene sulfonic acid which comprises, pumping molten naphthalene continuously into membrane type or column type reactor, feeding sulfonation agent containing SO3 proportionally, the molten naphthalene contacting the SO3 gas for instant reaction at the temperature of 80-170 deg. C, thus obtaining reactants of alpha-naphthalene sulfonic acids, and conveying the reactants to an ageing device for isomerisation. The invention also relates to the use of the process for preparing methyl naphthalene sulfonic acid.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a method for manufacturing a naphthalene sulfonated product. technical background [0002] Naphthalenesulfonic acid is used to make naphthol (C 10 h 7 OH) is also a raw material for the synthesis of azo dyes. The naphthalenesulfonic acid formaldehyde condensate obtained by the further condensation of naphthalenesulfonic acid and formaldehyde is an important intermediate for pigments, dyes, dispersants for emulsification synthesis, and cement water reducers. [0003] Naphthalenesulfonic acid is prepared by reacting naphthalene with a sulfonating agent. The traditional method of producing naphthalenesulfonic acid is to use the concentrated sulfuric acid process, and an excess of sulfuric acid is generally used during the reaction. Otherwise, after the concentration of sulfuric acid decreases with the progress of the reaction, the sulfonation reaction will be terminat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/35C07C303/06
Inventor 杨新长祝红元贝澄冷晓力
Owner SINOLIGHT CHEM
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