A clean production process of chitin

Abstract

A chitin clean production process belongs to the technical field of aquatic product processing. In the process of producing chitin, potassium hydroxide is used instead of sodium hydroxide, and then potassium hydroxide waste liquid is used as a digestant for seaweed fertilizer production; nitric acid is used Instead of hydrochloric acid, nitric acid waste liquid was used instead of part of phosphoric acid as a neutralizer for seaweed digestion liquid. The present invention changes the traditional thinking, changes the treatment of waste lye to use waste lye, uses potassium hydroxide instead of sodium hydroxide, and then uses potassium hydroxide waste liquid as a seaweed digester in the production process of seaweed fertilizer, turning waste into treasure, The treatment of waste lye from chitin production is exempted. At the same time, in the chitin production process, potassium hydroxide waste liquid contains a large amount of animal protein and other organic matter, and nitric acid waste liquid is rich in calcium and trace elements, making the produced seaweed The fertilizer is more nutritious and the fertilizer effect is better.

Description

technical field [0001] The invention belongs to the technical field of aquatic product processing, in particular to a clean production process of chitin. Background technique [0002] Chitin is a natural macromolecular biological polysaccharide, which is an important raw material for medicine, food, light industry, chemical industry, environmental protection, etc. Shrimp, crab and other shells are rich in chitin, which is the main raw material for the production of chitin. At present, the production of chitin mainly adopts the traditional acid-base process to produce chitin, which produces a large amount of waste water. Because the wastewater contains a large amount of protein, acid, alkali, calcium, etc., the wastewater treatment is difficult and expensive. The conventional treatment method for chitin production wastewater in China is to concentrate waste acid and waste lye, and then treat it with anaerobic or aerobic methods after mixing, sedimentation, flocculation, etc...

AI Technical Summary

Problems solved by technology

[0003] The traditional wastewater treatment technology is only for treatment, and the recyclable and useful components contained in the wastewater are basically consumed in vain, which not only wastes resources, but also has high processing costs and difficulties.

Therefore, for the treatment of chitin wastewater, it is difficult to achieve clean production by using terminal treatment methods. Only through comprehensive utilization can we truly achieve a model of clean production and sustainable development.

In recent years, methods of chitin production wastewater and comprehensive utilization have been reported at home and abroad, such as enzymatic hydrolysis instead of strong alkali to remove protein, strong alkali recycling, etc., but there are shortcomings such as high production costs and large investment in equipment.