Continuous acidification process for synthesizing 2-naphthol

Abstract

The invention discloses a continuous acidification process for synthesizing 2-naphthol. Sodium 2-naphthol and sulfur dioxide are adopted as starting raw materials and are subjected to continuous acidification by virtue of a multi-stage acidification tower so as to obtain 2-naphthol. By specially designing the acidification tower and optimizing the process, the defects of complicated operation, low utilization rate of sulfur dioxide, large amount of wastewater, difficulty in control of the sulfur dioxide feed, large labor demand and high cost in the traditional process are overcome. Compared with the traditional process, according to the continuous acidification process disclosed by the invention, the utilization rate of sulfur dioxide is increased by about 7%, the amount of wastewater is decreased by about 9.8%, the production period is shortened by 5% and meanwhile, the sulfur dioxide feed is easily controlled, the labor demand is small and the cost is low.

Description

technical field [0001] The invention relates to the technical field of production of 2-naphthol, in particular to a continuous acidification process for synthesizing 2-naphthol. Background technique [0002] 2-Naphthol is an important organic raw material and dye intermediate, widely used, such as used in the manufacture of tunic acid, butyric acid, β-naphthol-3-carboxylic acid, and used in the manufacture of rubber additives, anti-aging agents, organic pigments and Medicine etc. [0003] There are many patents and literature reports about the synthesis process of 2-naphthol at home and abroad, as disclosed in the Chinese patent literature with the publication number CN103626637 through sulfonation, neutralization, crystallization, filtration, drying, alkali fusion, dilution, sulfuric acid Acidification and rectification obtain 2-naphthol, and describe the recovery and utilization of production wastewater at the same time, and realize that the process has basically no waste...

AI Technical Summary

Problems solved by technology

[0005] On the one hand, the unreacted sulfur dioxide in the batch method is directly absorbed by the recovery system under negative pressure, and the utilization rate of sulfur dioxide is low;

[0006] On the other hand, the entry of sulfur dioxide into the recovery system leads to high pressure on the recovery system and produces a large amount of waste water;

[0007] Three aspects, the reaction time of the batch method is long, the production cycle is lengthened, and there is a shortcoming that the synthesis cost is relatively high;

[0008] Four aspects, the sulfur dioxide from the neutralization reaction enters the acidification process separately and is difficult to control

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