105% acid sulfonation manufacturing technique of 2-naphthalenol

Abstract

The present invention relates to a 105 percent acidic sulfonation production process of 2-naphthol, and belongs to the technical field of chemical production. In the process, molten refined naphthalene is added into a reaction still and is heated to be at the temperature between 135 DEG C and 140 DEG C, sulfuric acid of 105 percent is added within 30 minutes according to a mass ratio of 1.28 to 1, the temperature in the reaction still is raised to be 160 DEG C and maintained for 135 minutes, the sulphonation product with an acidity of 24 to 27 percent is prepared, and the next procedure is performed. The present invention solves the problems in the traditional process with sulphonation of sulphuric acid of 100 percent that water is generated in the process of substituting hydrogen on a double benzene nucleus with sulfonic group and has dilution effects on sulphuric acid, the substitution reaction is impeded, water becomes water vapor at the temperature of 160 DEG C which has hydrolysis effects on 1-naphthalene sulfonic acid and 2-naphthalene sulfonic acid, and the total yield rate of the sulfonation reaction is not high. And the present invention has the advantages that sulfuric acid of 105 percent is added, the sulfonation conversion and the product yield rate are improved, the generated naphthalene compounds and other byproducts are reduced, and the yield rate is improved by 1.1 percent.

Description

Technical field: [0001] The invention relates to a 105% acid sulfonation production process of 2-naphthol, which belongs to the field of chemical production process. Background technique: [0002] 2-Naphthol is used in the manufacture of various intermediates in the aniline dye industry, in the manufacture of anti-aging agents in the rubber industry, in the manufacture of evaporation accelerators in the sun-dried salt industry, and as raw materials for pigments, paints and ice dye primers . The industrial production method of 2-naphthol is to use refined naphthalene as the raw material, and process 100% sulfuric acid sulfonation, hydrolysis and blowing of naphthalene, neutralization, cold analysis, drying, alkali fusion, distillation and other processes. The disadvantage of this process is that when 100% sulfuric acid is used for sulfonation in the production process, water will be generated when the sulfonic acid group replaces the hydrogen on the naphthalene ring. Due to ...

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Problems solved by technology

The disadvantage of this process is that when 100% sulfuric acid is used for sulfonation in the production process, water will be generated when the sulfonic acid group replaces the hydrogen on the naphthalene ring. Due to the existence of water, one is to dilute the sulfuric acid and hinder the substitution reaction. The second is that water turns into water vapor at 160°C, which hydrolyzes the sulfonic acid groups of 1-naphthalenesulfonic acid and 2-naphthalenesulfonic acid, and produces naphthalene and sulfuric acid, which leads to poor overall yield of sulfonation reaction. high

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