CN111620967A - Production process for producing chitin with high-efficiency depigmentation - Google Patents
Production process for producing chitin with high-efficiency depigmentation Download PDFInfo
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- CN111620967A CN111620967A CN202010684394.2A CN202010684394A CN111620967A CN 111620967 A CN111620967 A CN 111620967A CN 202010684394 A CN202010684394 A CN 202010684394A CN 111620967 A CN111620967 A CN 111620967A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0003—General processes for their isolation or fractionation, e.g. purification or extraction from biomass
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Abstract
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.
Description
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.
The first embodiment is as follows:
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.
Further, the soaking time of soaking in clear water in the step (1) is 3min, and the soaking is repeated for 2 times.
Further, 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%.
Further, the soaking time in the step (2) is 36 hours, 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 clean water until the shrimp shells and the crab shells become neutral.
Further, in the step (3), the concentration of the sodium hydroxide solution is 8%, and the boiling time is kept to be 1.2 h.
Further, after boiling in the step (3), the shrimp shells or the crab shells are washed by clean water until the shrimp shells or the crab shells become neutral.
Further, the heating temperature in the step (4) is 40 ℃.
Further, the concentration of the caustic soda solution in the step (6) is 35%, and the heating temperature is 60 ℃.
The production process is suitable for mass rapid production of chitin.
Example two:
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.
Further, the soaking time of soaking in clear water in the step (1) is 10min, and the soaking is repeated for 3 times.
Further, 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 8%.
Further, the soaking time in the step (2) is 48 hours, 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 clean water until the shrimp shells and the crab shells become neutral.
Further, in the step (3), the concentration of the sodium hydroxide solution is 10%, and the boiling time is kept for 1.7 h.
Further, after boiling in the step (3), the shrimp shells or the crab shells are washed by clean water until the shrimp shells or the crab shells become neutral.
Further, the heating temperature in the step (4) is 60 ℃.
Further, the concentration of the caustic soda solution in the step (6) is 45%, and the heating temperature is 65 ℃.
The production process is suitable for producing chitin in small batches at a low speed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
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 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523007A (en) * | 2020-11-30 | 2021-03-19 | 南京林业大学 | Method for preparing high-strength transparent chitin nanofiber gelatin composite membrane by mild method |
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| CN106893005A (en) * | 2017-03-28 | 2017-06-27 | 周景天 | A kind of manufacture craft of soluble chitin |
| CN107722141A (en) * | 2017-11-24 | 2018-02-23 | 桂林浩新科技服务有限公司 | A kind of manufacture craft of soluble chitin |
| CN110591455A (en) * | 2019-09-26 | 2019-12-20 | 汪远昊 | Shrimp shell and crab shell chitosan formaldehyde sealant and preparation method thereof |
| CN110746659A (en) * | 2019-11-14 | 2020-02-04 | 广东医科大学 | Natural preservative film and preparation method thereof |
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2020
- 2020-07-16 CN CN202010684394.2A patent/CN111620967A/en active Pending
Patent Citations (5)
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| CN103880979A (en) * | 2012-12-22 | 2014-06-25 | 青岛中仁药业有限公司 | Extraction method for chitin from housefly larvae |
| CN106893005A (en) * | 2017-03-28 | 2017-06-27 | 周景天 | A kind of manufacture craft of soluble chitin |
| CN107722141A (en) * | 2017-11-24 | 2018-02-23 | 桂林浩新科技服务有限公司 | A kind of manufacture craft of soluble chitin |
| CN110591455A (en) * | 2019-09-26 | 2019-12-20 | 汪远昊 | Shrimp shell and crab shell chitosan formaldehyde sealant and preparation method thereof |
| CN110746659A (en) * | 2019-11-14 | 2020-02-04 | 广东医科大学 | Natural preservative film and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523007A (en) * | 2020-11-30 | 2021-03-19 | 南京林业大学 | Method for preparing high-strength transparent chitin nanofiber gelatin composite membrane by mild method |
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Application publication date: 20200904 |