阅读说明：本技术 一种生产甲壳素高效去色素的生产工艺 (Production process for producing chitin with high-efficiency depigmentation ) 是由 李炜祺 徐军飞 周寅 何继中 邓冲 曹从文 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种生产甲壳素高效去色素的生产工艺,所述生产工艺包括如下步骤：清洗,准备适量虾壳或者蟹壳,并将虾壳或者蟹壳浸泡在清水中,随后使用毛刷进行刷洗,刷洗结束后,将水倒掉,并重复上述步骤；酸洗软化,处理过的虾壳或者蟹壳按照一定的比例浸泡与稀盐酸内,并浸泡一端时间,直至不在产生气泡；碱洗中和,处理过的虾壳或者蟹壳放入锅内,并向锅内放入浓度适量的氢氧化钠溶液,随后进行煮沸。该生产工艺的有益效果是：在对原料进行氧化脱色时,对原料以及试剂进行增温,从而可以起到缩减脱色时间的效果,进而减少了甲壳素的生产周期,提升甲壳素的生产效率。(The invention discloses a production process for producing chitin with high efficiency and removing pigment, which comprises the following steps: cleaning, namely preparing a proper amount of shrimp shells or crab shells, soaking the shrimp shells or the crab shells in clear water, then brushing the shrimp shells or the crab shells by using a brush, pouring water after the brushing is finished, and repeating the steps; pickling and softening, namely soaking the treated shrimp shells or crab shells into dilute hydrochloric acid according to a certain proportion, and soaking for a period of time until no bubbles are generated; alkali washing for neutralization, the treated shrimp shells or crab shells are put into a pot, and sodium hydroxide solution with proper concentration is put into the pot, and then boiling is carried out. The production process has the beneficial effects that: when the raw materials are subjected to oxidation decoloration, the raw materials and the reagent are heated, so that the effect of reducing the decoloration time can be achieved, the production period of the chitin is reduced, and the production efficiency of the chitin is improved.)

1. A production process for producing chitin with high efficiency and depigmentation is characterized in that: the production process comprises the following steps:

(1) cleaning, namely preparing a proper amount of shrimp shells or crab shells, soaking the shrimp shells or the crab shells in clear water, then brushing the shrimp shells or the crab shells by using a brush, pouring water after the brushing is finished, and repeating the steps;

(2) pickling and softening, namely soaking the shrimp shells or the crab shells treated in the step (1) in dilute hydrochloric acid according to a certain proportion for a period of time until no bubbles are generated;

(3) alkali washing neutralization, namely putting the shrimp shells or crab shells treated in the step (2) into a pot, putting a sodium hydroxide solution with a proper concentration into the pot, and then boiling;

(4) performing oxidation decolorization, namely transferring the shrimp shells or the crab shells treated in the step (3) into a barrel, then putting water and a potassium permanganate decolorizer into the barrel, and heating and stirring the solution in the barrel until the shrimp shells or the crab shells are decolorized;

(5) drying in the sun, namely transferring the faded shrimp shells or crab shells in the step (4) into dewatering equipment for dewatering, and then spreading the dewatered shrimp shells or crab shells for drying in the sun;

(6) deacetylating, namely putting the dried shrimp shells or crab shells in the step (5) into a jacketed kettle, adding a caustic soda solution, uniformly stirring, heating the jacketed kettle, keeping the heating state for 24 hours, and stirring regularly during heating;

(7) and (4) detecting, taking out the shrimp shells or the crab shells in the jacketed kettle, soaking the shrimp shells or the crab shells in 1% glacial acetic acid solution, completing preparation if the shrimp shells or the crab shells are dissolved, and prolonging the heating time in the step (6) if the shrimp shells or the crab shells are not dissolved.

2. The production process of chitin efficient depigmentation according to claim 1, wherein: the soaking time of soaking in clear water in the step (1) is 3min-10min, and the soaking time is repeated for 2 times-3 times.

3. The production process of chitin efficient depigmentation according to claim 1, wherein: the ratio of the shrimp shell or the crab shell to the dilute hydrochloric acid in the step (2) is 1: 15, and the concentration of the dilute hydrochloric acid is 6-8%.

4. The production process of chitin efficient depigmentation according to claim 1, wherein: and (3) the soaking time in the step (2) is 28-48 h, if no bubbles are generated in the soaking process, the soaking is stopped, and the shrimp shells or the crab shells are cleaned by using clear water until the shrimp shells and the crab shells become neutral.

5. The production process of chitin efficient depigmentation according to claim 1, wherein: in the step (3), the concentration of the sodium hydroxide solution is 8-10%, and the boiling time is kept for 1.2-1.7 h.

6. The production process of chitin efficient depigmentation according to claim 1, wherein: and (4) after boiling in the step (3), cleaning the shrimp shells or the crab shells by using clear water until the shrimp shells or the crab shells become neutral.

7. The production process of chitin efficient depigmentation according to claim 1, wherein: the heating temperature in the step (4) is 40-60 ℃.

8. The production process of chitin efficient depigmentation according to claim 1, wherein: the concentration of the caustic soda solution in the step (6) is 35-45%, and the heating temperature is 60-65 ℃.

Technical Field

The invention relates to the technical field of chitin production processes, in particular to a production process for producing chitin with high-efficiency pigment removal.

Background

Chitin (C8H13O5N) n, also known as chitin or chitin, was found by blakeno, a french scholar, in 1811, in 1823 to be extracted from crustacean shells by legel, where chitin is light beige to white, soluble in concentrated hydrochloric acid, phosphoric acid, sulfuric acid or acetic acid, insoluble in alkali and other organic solvents, and also insoluble in water, and the deacetylated derivative of chitin, chitosan, is insoluble in water and soluble in part of dilute acids.

In the existing chitin production process, oxidation decolorization is usually carried out at normal temperature, so that the velocity of the decolorization is low, more time is needed for the decolorization, and the production period of the chitin is greatly prolonged.

Disclosure of Invention

The invention aims to provide a production process for producing chitin with high-efficiency pigment removal, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a production process for producing chitin with high efficiency and removing pigment comprises the following steps:

(1) cleaning, preparing a proper amount of shrimp shells or crab shells, soaking the shrimp shells or the crab shells in clear water, then brushing the shrimp shells or the crab shells by using a brush, pouring water after the brushing is finished, and repeating the steps.

(2) Pickling and softening, namely soaking the shrimp shells or the crab shells treated in the step (1) in dilute hydrochloric acid according to a certain proportion for a period of time until no bubbles are generated.

(3) And (3) alkali washing neutralization, namely putting the shrimp shells or the crab shells treated in the step (2) into a pot, putting a sodium hydroxide solution with proper concentration into the pot, and then boiling.

(4) And (3) oxidation and decoloration, namely transferring the shrimp shells or the crab shells treated in the step (3) into a barrel, then putting water and a potassium permanganate fading agent into the barrel, and heating and stirring the solution in the barrel until the shrimp shells or the crab shells fade.

(5) And (4) drying, namely transferring the faded shrimp shells or crab shells in the step (4) into dewatering equipment for dewatering, and then spreading the dewatered shrimp shells or crab shells for drying.

(6) And (3) deacetylating, namely putting the dried shrimp shells or crab shells in the step (5) into a jacketed kettle, adding a caustic soda solution, uniformly stirring, heating the jacketed kettle, keeping the heating state for 24 hours, and stirring regularly during heating.

(7) And (4) detecting, taking out the shrimp shells or the crab shells in the jacketed kettle, soaking the shrimp shells or the crab shells in 1% glacial acetic acid solution, completing preparation if the shrimp shells or the crab shells are dissolved, and prolonging the heating time in the step (6) if the shrimp shells or the crab shells are not dissolved.

Preferably, the soaking time of soaking in clear water in the step (1) is 3min-10min, and the soaking is repeated for 2 times-3 times.

Preferably, the ratio of the shrimp shell or the crab shell and the dilute hydrochloric acid in the step (2) is 1: 15, and the concentration of the dilute hydrochloric acid is 6-8%.

Preferably, the soaking time in the step (2) is 28-48 h, and if no bubbles are generated in the soaking process, the soaking is stopped, and the shrimp shells or the crab shells are cleaned by using clear water until the shrimp shells and the crab shells become neutral.

Preferably, the concentration of the sodium hydroxide solution in the step (3) is 8-10%, and the boiling time is kept for 1.2-1.7 h.

Preferably, after the boiling in the step (3), the shrimp shells or the crab shells are washed with clean water until the shrimp shells or the crab shells become neutral.

Preferably, the heating temperature in the step (4) is 40 ℃ to 60 ℃.

Preferably, the concentration of the caustic soda solution in the step (6) is 35-45%, and the heating temperature is 60-65 ℃.

Compared with the prior art, the invention has the beneficial effects that: when the raw materials are subjected to oxidation decoloration, the raw materials and the reagent are heated, so that the effect of reducing the decoloration time can be achieved, the production period of the chitin is reduced, and the production efficiency of the chitin is improved.

Drawings

FIG. 1 is a flow chart of the production process of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.