CN102477108A - Chitosan and preparation method thereof - Google Patents

Abstract

The invention relates to aquatic products such as shrimp and crab shells, and specifically relates to chitosan and a preparation method thereof. The invention belongs to the technical field of chemical engineering. According to the invention, crab shells are selected, and are placed in a decalcification tank; a prepared 4% hydrochloric acid solution is pumped into the decalcification tank, and decalcification is carried out; a protein (fat) removing process is carried out; and a chitosan preparing process is carried out, such that a chitosan finished product is obtained. With the method, a problem of crab shell reutilization is well solved, economic benefits of aquatic product departments and fishermen are improved, and the environment can be protected.

Description

A kind of chitose and preparation method thereof that gathers

Technical field

The present invention relates to a kind of fishery products shrimp, crab shell etc., specifically relate to a kind of chitose and preparation method thereof that gathers, belong to chemical technology field.

Background technology

Fish for crab class fishery products enormous amount every year in the coastland, and after fishery products enterprise extracted crab meat, the only simple solarization dry grinding of a large amount of crab shells supplied the additive of feedstuff industry as the feed calcium source.How to improve crab shell overall economic efficiency and utilize level; Scientific and technological circle have carried out many research and inquirement both at home and abroad; With the crab shell is that the chitosan of raw material manufacturing is necessarily used in fields such as protective foods, medicine, chemical industry, biotechnology, and DEVELOPMENT PROSPECT is very good.

Summary of the invention

The objective of the invention is for overcoming the weak point of above-mentioned prior art; A kind of chitose and preparation method thereof that gathers is provided, and the decalcification jar of packing into after this method utilizes Carapax Eriocheir sinensis selected pumps into 4% hydrochloric acid soln for preparing in the decalcification jar; Carry out decalcification; Through deproteinization (fat) operation, preparation chitosan operation gets the chitosan finished product again.

The present invention realizes with following technical scheme: a kind of chitose and preparation method thereof that gathers is characterized in that: this method comprises the preparation of chitin, chitosan, specifically as follows:

(1) chitin processing: the crab shell is packed in the decalcification jar for preparing 4% hydrochloric acid soln, react after 10 hours, and when jar internal reaction liquid PH reached 6.5 left and right sides, the new acid-respons that pumps into new preparation again drained into the spent acid groove after 8 hours, and is subsequent use after dewatering;

(2) deproteinization operation: in taking off the acetoxylation jar, carry out, in the chitin tank filling of step (1), pump into 10% alkali lye that has prepared in the jar to material submergence place with alkali pump; Add steam from sheathed heater and heat up and boil, boil and stop heating after 1.5 hours, after waste liquid drains; Add washing water with pump and carry out washing by soaking, when PH reaches 7.5 in the solution, discharge washing water as 10% alkali lye preparation water; Unload chitin, use centrifuge dewatering;

(3) preparation chitosan operation: after compacting flattened in the chitin tank filling, it was interior to submergence material place to pump into jar to 50% alkali lye for preparing, logical vapour heat tracing; Temperature 70-80 ℃, after 8 hours, put down jar interior surplus alkali to a middle lye vat; The new high alkali liquid that pumps into new preparation again continues insulation reaction deacetylated end after 12 hours, gets into the washing of alkali pump pump circulation, when washing PH7.5; Unload chitosan,, promptly get the chitosan finished product with drying behind the centrifuge dewatering or drying.

Advantage of the present invention is: the decalcification jar of packing into after this method utilizes Carapax Eriocheir sinensis selected, pump into 4% hydrochloric acid soln for preparing in the decalcification jar, and carry out decalcification, through deproteinization (fat) operation, preparation chitosan operation, promptly get the chitosan finished product again.This method has well solved the utilization again of Carapax Eriocheir sinensis, has improved aquatic products department and fisherman's economic benefit, also helps the protection of environment.

Embodiment

Below in conjunction with embodiment the present invention is done further explain:

Embodiment,

A kind of chitose and preparation method thereof that gathers is characterized in that: this method comprises the preparation of chitin, chitosan, specifically as follows:

(1) chitin processing: the crab shell is packed in the decalcification jar for preparing 4% hydrochloric acid soln, react after 10 hours, and when jar internal reaction liquid PH reached 6.5 left and right sides, the new acid-respons that pumps into new preparation again drained into the spent acid groove after 8 hours, and is subsequent use after dewatering;

(2) deproteinization operation: in taking off the acetoxylation jar, carry out, in the chitin tank filling of step (1), pump into 10% alkali lye that has prepared in the jar to material submergence place with alkali pump; Add steam from sheathed heater and heat up and boil, boil and stop heating after 1.5 hours, after waste liquid drains; Add washing water with pump and carry out washing by soaking, when PH reaches 7.5 in the solution, discharge washing water as 10% alkali lye preparation water; Unload chitin, use centrifuge dewatering;

(3) preparation chitosan operation: after compacting flattened in the chitin tank filling, it was interior to submergence material place to pump into jar to 50% alkali lye for preparing, logical vapour heat tracing; Temperature 70-80 ℃, after 8 hours, put down jar interior surplus alkali to a middle lye vat; The new high alkali liquid that pumps into new preparation again continues insulation reaction deacetylated end after 12 hours, gets into the washing of alkali pump pump circulation, when washing PH7.5; Unload chitosan,, promptly get the chitosan finished product with drying behind the centrifuge dewatering or drying.

Claims (1)

1. one kind is gathered chitose and preparation method thereof, it is characterized in that: this method comprises the preparation of chitin, chitosan, specifically as follows:

(1) chitin processing: the crab shell is packed in the decalcification jar for preparing 4% hydrochloric acid soln, react after 10 hours, and when jar internal reaction liquid PH reached 6.5 left and right sides, the new acid-respons that pumps into new preparation again drained into the spent acid groove after 8 hours, and is subsequent use after dewatering;

(2) deproteinization operation: in taking off the acetoxylation jar, carry out, in the chitin tank filling of step (1), pump into 10% alkali lye that has prepared in the jar to material submergence place with alkali pump; Add steam from sheathed heater and heat up and boil, boil and stop heating after 1.5 hours, after waste liquid drains; Add washing water with pump and carry out washing by soaking, when PH reaches 7.5 in the solution, discharge washing water as 10% alkali lye preparation water; Unload chitin, use centrifuge dewatering;

(3) preparation chitosan operation: after compacting flattened in the chitin tank filling, it was interior to submergence material place to pump into jar to 50% alkali lye for preparing, logical vapour heat tracing; Temperature 70-80 ℃, after 8 hours, put down jar interior surplus alkali to a middle lye vat; The new high alkali liquid that pumps into new preparation again continues insulation reaction deacetylated end after 12 hours, gets into the washing of alkali pump pump circulation, when washing PH7.5; Unload chitosan,, promptly get the chitosan finished product with drying behind the centrifuge dewatering or drying.