Method for recovering glucosamine hydrochloride from hydrolytic mother liquid of glucosamine hydrochloride

Abstract

The invention relates to a method for recovering a glucosamine hydrochloride from a hydrolytic mother liquid of the glucosamine hydrochloride. According to the method, chitin is added to concentrated hydrochloric acid with the concentration of 30-31% according to a weight ratio of 1:2.5 and is hydrolyzed for 3.5-4.5h at 90-95DEG C, the obtained liquid is cooled, the deposition is crystallized, the mother liquid generated by centrifuge dewatering is added with a special crystal induction agent at 40-50DEG C, is stirred for 25-35min by an anchor stirrer, is cooled to below 10DEG C by refrigerated water, and stands for not less than 4h at the temperature, the supernatant is sucked out by a vacuum tube, and the deposition is centrifuged to dryness to obtain crude crystals. The method allows the energy consumption to be low, the operation time to be short, and the recovery rate to reach 80-85%. Compared with present traditional high-temperature (85-90DEG C) long-time (10h) vacuum concentration recovery methods, the method of the invention allows the recovery rate of the glucosamine hydrochloride to be increased by about 20%, the crude crystal quality to be obviously better because of the low temperature deposition mode, the comprehensive energy consumption to be reduced, the production period to be shortened, the labor cost and the equipment maintenance cost to be reduced, and the production cost to be lower.

Description

technical field [0001] The invention relates to the field of biochemical technology, in particular to a method for recovering glucosamine hydrochloride from glucosamine hydrochloride hydrolysis mother liquor. Background technique [0002] The hydrolyzed mother liquor produced by adding concentrated hydrochloric acid to hydrolyze chitin during the production of glucosamine hydrochloride must be recovered because it still contains about 10-15% glucosamine hydrochloride dissolved in the mother liquor. [0003] The existing traditional recovery process uses high temperature (85-90°C) long-term (10 hours) vacuum concentration recovery method, which consumes a lot of cost, such as energy consumption steam and electricity, labor costs and equipment maintenance costs, etc., and the amino acid in the mother liquor The recovery rate of the crude glucosamine hydrochloride is only 60-65%, and about 20% of the crude glucosamine hydrochloride is broken and decomposed due to long-term heat...

AI Technical Summary

Problems solved by technology

[0003] The existing traditional recovery process uses high temperature (85-90°C) long-term (10 hours) vacuum concentration recovery method, which consumes a lot of cost, such as energy consumption steam and electricity, labor costs and equipment maintenance costs, etc., and the amino acid in the mother liquor The recovery rate of the crude glucosamine hydrochloride is only 60-65%, and about 20% of the crude glucosamine hydrochloride is destroyed and decomposed by heating at high temperature for a long time and burning the wall, so it cannot be recovered, resulting in huge waste and loss