Chitosan and seaweed fertilizer joint production method

Abstract

The invention provides a chitosan and seaweed fertilizer joint production method and belongs to the technical field of aquatic product processing. In the chitosan production process, potassium hydroxide replaces sodium hydroxide and then potassium hydroxide waste liquor is used as a digestant for seaweed fertilizer production; hydrochloric acid is replaced by nitric acid and nitric acid waste liquor replaces part of phosphoric acid to be used as a neutralizer for a seaweed digestive liquid. The traditional thinking is changed, waste alkali liquor is utilized instead of being treated, the waste is turned into wealth, and treatment of the waste alkali liquor in chitosan production is avoided. Meanwhile, the potassium hydroxide waste liquor contains a large quantity of organic matters such as animal protein and the like, and the nitric acid waste liquor contains abundant calcium and microelements, so that produced seaweed fertilizer is rich in nutrition and better in fertilizer efficiency. Two production technologies are combined, the production cost of chitosan and the seaweed fertilizer is reduced, the quality of the seaweed fertilizer is improved, and the win-win effect is realized.

Description

technical field [0001] The invention belongs to the technical field of aquatic product processing, and in particular relates to a joint production method of chitosan and seaweed fertilizer. Background technique [0002] Chitosan is a natural macromolecular biological polysaccharide, which is another element to maintain human life after protein, fat and vitamins, and is an important raw material for medicine, food, light industry, chemical industry, environmental protection, etc. Shrimp, crab and other shells are rich in chitosan, which is the main raw material for the production of chitosan. The main production process of using shrimp or crab shells to produce chitosan is: remove calcium and other inorganic minerals in shrimp and crab carapaces with hydrochloric acid solution, remove organic matter such as protein in and on the shell with sodium hydroxide solution, and finally use 40 % of sodium hydroxide solution to remove acetylation and other processes to obtain chitosan...

AI Technical Summary

Problems solved by technology

The production process is simple and has strong applicability, but it produces a large amount of waste water, which contains strong acid, strong alkali and organic matter, which seriously pollutes the environment.

This kind of wastewater treatment is difficult and expensive, and a large amount of protein, residual alkali and other useful components in the wastewater also cause a lot of waste of resources while polluting the environment

[0003] In recent years, new chitosan production processes and wastewater treatment methods have been reported at home and abroad, such as enzymatic hydrolysis instead of strong alkali for protein removal, strong alkali recycling, etc., but there are shortcomings such as high production costs and large equipment investment.