Novel process for producing 1,4-dihydroxy anthraquinone

Abstract

The invention discloses a novel process for producing 1,4-dihydroxy anthraquinone, and relates to the technical field of chemical production. The technological process is as follows: firstly, co-heating and dehydrating fuming sulphuric acid and boric acid for 30-60 minutes, adding phthalic anhydride, heating up to 130 DEG C, adding parachlorophenol into the reaction system for multiple times in batches, heating up to 200-205 DEG C after adding the parachlorophenol, continuously reacting for 5-10 hours, slowly putting a reactant in 8 times by volume of water for hydrolysis after the reaction is finished, controlling the hydrolysis temperature at 100-130 DEG C, extracting the product to an organic phase by use of a solvent after hydrolysis, discharging the lower-layer waste acid, washing the upper-layer extracting solution by use of hot water, distilling the solvent for cycle use, and carrying out high-vacuum distillation and sublimation to obtain high-quality 1,4-dihydroxy anthraquinone. The novel process disclosed by the invention is used for improving the product yield and reducing the production cost by regulating process conditions such as raw material feeding ratio, feeding method, feeding temperature and the like on the premise of ensuring the product yield and the product quality.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a new process for producing 1,4-dihydroxyanthraquinone by p-chlorophenol method. Background technique [0002] 1,4-dihydroxyanthraquinone, commonly known as quinazine, can be used as smoke dyes, pigments and solvent dyes, and can also be used as disperse dyes in transfer printing process. In addition, 1,4-dihydroxyanthraquinone is an important intermediate in the synthesis of aminoanthraquinone, which can be used to synthesize 1,4-diaminoanthraquinone, 1-hydroxy-4-substituted aminoanthraquinone, 1,4-disubstituted amino Anthraquinone, or introducing a substituent at the β-position to obtain a series of red and blue dyes, is widely used in the synthesis of disperse dyes, acid dyes, reactive dyes, and vat dyes, and plays an important role in the dye industry. The anthraquinone dyes synthesized therefrom are one of the most important types in the anthraquinone dye family...

AI Technical Summary

Problems solved by technology

In addition, whether it is the hydroquinone route or the p-chlorophenol route, a large amount of water must be used for multiple washings during the product separation process, resulting in a large amount of acidic wastewater, and there are still long process times, high labor intensity, and labor costs. Problems such as poor environment and unstable product quality