A high-value comprehensive utilization method of shrimp and crab shells based on catalytic oxidation of reducing sugar and its application

Abstract

The invention discloses a method for high-value comprehensive utilization of shrimp and crab shells based on catalytic oxidation of reducing sugar and its application. The method includes the following steps: (1) Wash discarded shrimp and crab shells, dry them, grind them into powder and sieve them to obtain shrimp and crab shell powder; (2) Mix the shrimp and crab shell powder with potassium hydroxide solution to remove them. Protein treatment and filtration to obtain protein-containing filtrate and deproteinized shrimp and crab shell powder; then sterilize the filtrate and add concentrated phosphoric acid to adjust the pH value to neutral, concentrate and dry to obtain organic solid fertilizer; (3) sterilize the deproteinized shrimp and crab shell powder The proteinated shrimp and crab shell powder is mixed with the reducing sugar solution, a catalyst and an oxidant are added to react, and filtered to obtain chitin and a filtrate containing calcium gluconate; the filtrate is then concentrated and recrystallized to obtain calcium gluconate. The method of the invention can effectively extract chitin from shrimp and crab shells, and simultaneously prepare by-products such as calcium gluconate and organic fertilizers, solving the problem of zero waste discharge and realizing all-round comprehensive utilization.

Description

technical field [0001] The invention belongs to the research field of high-value shrimp and crab shells, and in particular relates to a high-value comprehensive utilization method and application of shrimp and crab shells based on catalytic oxidation of reducing sugar. Background technique [0002] my country's vast sea area is rich in marine fishery resources. Fishery is an important part of my country's agriculture. Shrimp and crab products occupy an important position in fishery output. With the rapid development of aquaculture, a large amount of shrimp and crab shell waste is produced. If it is not utilized, it will cause some pollution to the ecological environment. Making full use of the shrimp and crab shell waste is conducive to the sustainable development of the ecological environment. [0003] In the whole country, shrimp and crab are rich in resources and are an important part of the economy. With the progress of society and economy, their demand is also increasin...

AI Technical Summary

Problems solved by technology

Although the invention reduces the amount of acid and alkali, it does not achieve zero discharge, resulting in waste of resources to a certain extent

CN107312109A discloses a method for extracting chitin from shrimp and crab shells with degradable ionic liquids. In the process, citric acid needs to be used for secondary decalcification to realize high-value utilization of biological calcium. However, in industrial production, a large amount of chitin needs to be used. Expensive degradable ionic liquids with high requirements for process operation and difficult promotion

CN109053930A discloses a process for preparing chitin and organic calcium fertilizer, which specifically involves the steps of organic acid decalcification, enzymatic deproteinization and inorganic acid decalcification. This invention creatively realizes the reuse of waste liquid and solves the problem of avoiding secondary Pollution and other issues, but the process uses organic acids and inorganic acids, the calcium waste liquid is not purified into pure calcium agents, but simply mixed into organic liquid fertilizers, reducing economic benefits

CN108456261A uses steam explosion technology to destroy the dense structure of shrimp and crab shells. In the process, organic acid decalcification and enzymatic deproteinization are required to effectively obtain organic acid calcium, chitin and protein liquid, and realize the purpose of comprehensive utilization of shrimp and crab shells , the process is simple but expensive