CN113698873A - Method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather leftover - Google Patents
Method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather leftover Download PDFInfo
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- CN113698873A CN113698873A CN202110396690.7A CN202110396690A CN113698873A CN 113698873 A CN113698873 A CN 113698873A CN 202110396690 A CN202110396690 A CN 202110396690A CN 113698873 A CN113698873 A CN 113698873A
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- leather
- chromium
- leftovers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09H—PREPARATION OF GLUE OR GELATINE
- C09H1/00—Pretreatment of collagen-containing raw materials for the manufacture of glue
- C09H1/04—Pretreatment of collagen-containing raw materials for the manufacture of glue of hides, hoofs, or leather scrap
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09H—PREPARATION OF GLUE OR GELATINE
- C09H3/00—Isolation of glue or gelatine from raw materials, e.g. by extracting, by heating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09H—PREPARATION OF GLUE OR GELATINE
- C09H9/00—Drying of glue or gelatine
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to the technical field of leather waste recycling, and discloses a method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather which is a leather leftover. The invention has the following purposes by setting a series of processes of placing leather leftovers containing chrome blue wet leather, soaking, sealing, cleaning, dechroming, decoiling and expanding, mincing, heating, filtering, concentrating, collecting and packaging: through soaking the setting that pH value is neutral among the skin processing to the dechromization processing, at first carry out basicity and acid processing back to leather leftover bits and pieces contain the wet skin of chromium blue when production, carry out complete washing again, thoroughly get rid of this kind of heavy metal of inside chromium, reached and prevented to cause the purpose of heavy metal polluted environment at the in-process of waste utilization, water through membrane filtration returns the setting of used and abluent water recycle, can prevent the water waste resource when production, reached the purpose at waste utilization's in-process water economy resource.
Description
Technical Field
The invention relates to the technical field of leather waste recycling, in particular to a method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather which is a leather leftover.
Background
At present, a large number of enterprises for producing, processing and recycling leather can generate a large amount of leather leftover materials in the production and operation processes of the enterprises, the generated leather leftover materials mainly comprise blue wet leather, finished leather leftover materials and the like, the main component of the leather leftover materials is solidified and denatured protein containing heavy metal chromium, about 15 percent of the total amount of the leftover materials are used as raw materials for producing the regenerated leather, the rest most of the leftover materials are difficult to be used as the raw materials for producing the regenerated leather, and only other industrial wastes are mixed for carrying out cleaning treatment, so that the leather leftover materials are not effectively treated all the time.
The prior method for producing industrial gelatin by replacing the chrome-containing blue wet leather which is leftover of leather with gray leather has the following defects: firstly, water resource consumption is too large, water after use cannot be recycled, and secondly, heavy metal chromium in the water cannot be well treated when being cleared away, so that heavy metal pollution is easily caused.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for producing industrial gelatin by replacing grey leather with chrome-containing blue wet leather which is a leather leftover, has the advantages of saving resources, preventing heavy metal pollution and the like, and solves the problems in the background art.
(II) technical scheme
In order to realize the purposes of saving resources and preventing heavy metal pollution, the invention provides the following technical scheme:
the invention aims to solve another technical problem of providing a method for producing industrial gelatin by replacing grey leather with chrome-containing blue wet leather which is leftover of leather, comprising the following steps:
1) placing the chromium-containing blue wet leather made of leather leftovers: placing the wet leather containing chrome blue from the leather leftovers into the pool.
2) And (3) soaking the skin: adding lime milk, and filling 3% of the lime milk into the pool; adding sodium hydroxide solution, and adding 3% sodium hydroxide solution into the pool for skin soaking.
3) Sealing and placing: and placing the chrome blue wet leather leftover subjected to leather soaking treatment into a closed pool, and then sealing the pool for 3 to 15 days.
4) Cleaning treatment: and (3) putting the chrome blue wet leather which is stuffy and reddish leather leftovers into a device capable of rotating and washing with water, recycling the water for washing until the pH value of the chrome blue wet leather which is leather leftovers is neutral.
5) And (3) dechromization treatment: adding 1 to 3 percent of sulfuric acid for dechromization soaking and washing, and adding water for washing after the chromium in the chromium-containing blue wet leather leftovers of the leather is dechromized and qualified.
6) Removing and kneading and expanding treatment: adding 1-3% sodium hydroxide solution into the dechromized peels, fully expanding the peels, adding water for washing, and washing until the pH value is neutral.
7) Mincing and heating: mincing the swelled skin with a meat mincer, adding water into the minced skin, boiling the glue, and stopping stirring and heating when the concentration of the glue solution reaches 3-8%.
8) And (3) filtering and concentrating: pumping the supernatant of the glue solution into another container, adding a flocculating agent for flocculation, introducing the flocculated mixture into a bag filter for filtration, filtering and concentrating the filtered glue solution by using a membrane, and returning the water filtered by the membrane for recycling.
9) Collecting and packaging: the glue solution with the concentration of 35 percent to 50 percent enters a film scraper evaporator to be steamed to 55 percent to 70 percent high-concentration solution, the glue solution of the high-concentration solution is put into a strip extruding machine to be extruded, and the extruded strip is put into a belt type (fixed bed type) dryer to be dried, crushed and packaged for sale
Preferably, the liquid level in the second step is higher than the upper surface of the wet leather containing chrome blue of the leather leftovers.
Preferably, the filtering times in the step eight are multiple times until the supernatant liquid of the glue solution does not have flocculated flocculates.
Preferably, in the second step, the ph of the solution in the pond is 10-12, and the soaking time is 4 hours plus or minus 20 minutes.
Preferably, the pH of the solution in the dechromization treatment in the step five is 7-9, and the soaking time is 4 hours plus or minus 20 minutes.
(III) advantageous effects
Compared with the prior art, the invention provides a method for producing industrial gelatin by replacing hide with chrome-containing blue wet hide which is leftover of leather, and the method has the following beneficial effects:
1. the method for producing the industrial gelatin by replacing the grey leather with the chrome-containing blue wet leather of the leather leftovers comprises the steps of performing soaking treatment until the PH value is neutral in dechromization treatment, completely cleaning the chrome-containing blue wet leather of the leather leftovers after performing alkaline and acidic treatment during regeneration, and completely removing heavy metal such as internal chrome, so as to achieve the purpose of preventing the heavy metal from polluting the environment in the waste utilization process.
2. According to the method for producing the industrial gelatin by replacing the grey leather with the chrome-containing blue wet leather leftover, water filtered by the membrane is returned for recycling and the cleaned water is recycled, so that water resource waste can be prevented during production, and the aim of saving water resources in the waste utilization process is fulfilled.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 method for producing industrial gelatin by replacing grey leather with chrome-containing blue wet leather which is leftover of leather comprises the following steps:
1) placing the chromium-containing blue wet leather made of leather leftovers: placing the wet leather containing chrome blue from the leather leftovers into the pool.
2) And (3) soaking the skin: adding lime milk, and filling 3% of the lime milk into the pool; adding sodium hydroxide solution, and adding 3% sodium hydroxide solution into the pool for skin soaking.
3) Sealing and placing: and placing the chrome blue wet leather leftover subjected to leather soaking treatment into a closed pool, and then sealing the pool for 3 to 15 days.
4) Cleaning treatment: and (3) putting the chrome blue wet leather which is stuffy and reddish leather leftovers into a device capable of rotating and washing with water, recycling the water for washing until the pH value of the chrome blue wet leather which is leather leftovers is neutral.
5) And (3) dechromization treatment: adding 1 to 3 percent of sulfuric acid for dechromization soaking and washing, and adding water for washing after the chromium in the chromium-containing blue wet leather leftovers of the leather is dechromized and qualified.
6) Removing and kneading and expanding treatment: adding 1-3% sodium hydroxide solution into the dechromized peels, fully expanding the peels, adding water for washing, and washing until the pH value is neutral.
7) Mincing and heating: mincing the swelled skin with a meat mincer, adding water into the minced skin, boiling the glue, and stopping stirring and heating when the concentration of the glue solution reaches 3-8%.
8) And (3) filtering and concentrating: pumping the supernatant of the glue solution into another container, adding a flocculating agent for flocculation, introducing the flocculated mixture into a bag filter for filtration, filtering and concentrating the filtered glue solution by using a membrane, and returning the water filtered by the membrane for recycling.
9) Collecting and packaging: after the glue solution with the concentration of 35-50% enters a film scraper evaporator and is steamed to a high-concentration solution with the concentration of 55-70%, the glue solution of the high-concentration solution is put into a strip extruding machine for extruding strips, and the extruded strips are put into a belt type (fixed bed type) dryer for drying, crushing and packaging for sale.
The liquid level in the step II is higher than the upper surface of the wet leather containing chrome blue of the leather leftovers, the filtration times in the step eight are multiple times until the supernatant liquid of the glue solution is not flocculated, the ph of the solution in the pool in the step II is 12, the soaking time is 4 hours, the ph of the solution in the dechromization treatment in the step V is 9, and the soaking time is 4 hours.
Example two: a method for producing industrial gelatin by replacing grey leather with chrome-containing blue wet leather which is leftover of leather comprises the following steps:
1) placing the chromium-containing blue wet leather made of leather leftovers: placing the wet leather containing chrome blue from the leather leftovers into the pool.
2) And (3) soaking the skin: adding lime milk, and filling 3% of the lime milk into the pool; adding sodium hydroxide solution, and adding 3% sodium hydroxide solution into the pool for skin soaking.
3) Sealing and placing: and placing the chrome blue wet leather leftover subjected to leather soaking treatment into a closed pool, and then sealing the pool for 3 to 15 days.
4) Cleaning treatment: and (3) putting the chrome blue wet leather which is stuffy and reddish leather leftovers into a device capable of rotating and washing with water, recycling the water for washing until the pH value of the chrome blue wet leather which is leather leftovers is neutral.
5) And (3) dechromization treatment: adding 1 to 3 percent of sulfuric acid for dechromization soaking and washing, and adding water for washing after the chromium in the chromium-containing blue wet leather leftovers of the leather is dechromized and qualified.
6) Removing and kneading and expanding treatment: adding 1-3% sodium hydroxide solution into the dechromized peels, fully expanding the peels, adding water for washing, and washing until the pH value is neutral.
7) Mincing and heating: mincing the swelled skin with a meat mincer, adding water into the minced skin, boiling the glue, and stopping stirring and heating when the concentration of the glue solution reaches 3-8%.
8) And (3) filtering and concentrating: pumping the supernatant of the glue solution into another container, adding a flocculating agent for flocculation, introducing the flocculated mixture into a bag filter for filtration, filtering and concentrating the filtered glue solution by using a membrane, and returning the water filtered by the membrane for recycling.
9) Collecting and packaging: after the glue solution with the concentration of 35-50% enters a film scraper evaporator and is steamed to a high-concentration solution with the concentration of 55-70%, the glue solution of the high-concentration solution is put into a strip extruding machine for extruding strips, and the extruded strips are put into a belt type (fixed bed type) dryer for drying, crushing and packaging for sale.
The liquid level in the step II is higher than the upper surface of the wet leather containing chrome blue of the leather leftovers, the filtration times in the step eight are multiple times until the supernatant liquid of the glue solution is not flocculated, the ph of the solution in the pool in the step II is 11, the soaking time is 4 hours, the ph of the solution in the dechromization treatment in the step V is 7, and the soaking time is 4 hours.
Example three: a method for producing industrial gelatin by replacing grey leather with chrome-containing blue wet leather which is leftover of leather comprises the following steps:
1) placing the chromium-containing blue wet leather made of leather leftovers: placing the wet leather containing chrome blue from the leather leftovers into the pool.
2) And (3) soaking the skin: adding lime milk, and filling 3% of the lime milk into the pool; adding sodium hydroxide solution, and adding 3% sodium hydroxide solution into the pool for skin soaking.
3) Sealing and placing: and placing the chrome blue wet leather leftover subjected to leather soaking treatment into a closed pool, and then sealing the pool for 3 to 15 days.
4) Cleaning treatment: and (3) putting the chrome blue wet leather which is stuffy and reddish leather leftovers into a device capable of rotating and washing with water, recycling the water for washing until the pH value of the chrome blue wet leather which is leather leftovers is neutral.
5) And (3) dechromization treatment: adding 1 to 3 percent of sulfuric acid for dechromization soaking and washing, and adding water for washing after the chromium in the chromium-containing blue wet leather leftovers of the leather is dechromized and qualified.
6) Removing and kneading and expanding treatment: adding 1-3% sodium hydroxide solution into the dechromized peels, fully expanding the peels, adding water for washing, and washing until the pH value is neutral.
7) Mincing and heating: mincing the swelled skin with a meat mincer, adding water into the minced skin, boiling the glue, and stopping stirring and heating when the concentration of the glue solution reaches 3-8%.
8) And (3) filtering and concentrating: pumping the supernatant of the glue solution into another container, adding a flocculating agent for flocculation, introducing the flocculated mixture into a bag filter for filtration, filtering and concentrating the filtered glue solution by using a membrane, and returning the water filtered by the membrane for recycling.
9) Collecting and packaging: after the glue solution with the concentration of 35-50% enters a film scraper evaporator and is steamed to a high-concentration solution with the concentration of 55-70%, the glue solution of the high-concentration solution is put into a strip extruding machine for extruding strips, and the extruded strips are put into a belt type (fixed bed type) dryer for drying, crushing and packaging for sale.
The liquid level in the step II is higher than the upper surface of the wet leather containing chrome blue of the leather leftovers, the filtration times in the step eight are multiple times until the supernatant liquid of the glue solution is not flocculated, the ph of the solution in the pool in the step II is 11, the soaking time is 4 hours, the ph of the solution in the dechromization treatment in the step V is 8, and the soaking time is 4 hours
And (4) judging the standard: and when the ph of the solution in the tank in the second step is 11, the soaking time is 4 hours, the ph of the solution in the dechromization treatment in the fifth step is 8, and the soaking time is 4 hours, the quantity and the quality of the produced industrial gelatin are high.
The invention has the beneficial effects that: through soaking the setting that pH value is neutral among the skin processing to the dechromization processing, at first carry out basicity and acid processing back to leather leftover bits and pieces contain the wet skin of chromium blue when production, carry out complete washing again, thoroughly get rid of this kind of heavy metal of inside chromium, reached and prevented to cause the purpose of heavy metal polluted environment at the in-process of waste utilization, water through membrane filtration returns the setting of used and abluent water recycle, can prevent the water waste resource when production, reached the purpose at waste utilization's in-process water economy resource.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for producing industrial gelatin by replacing grey leather with chrome-containing blue wet leather which is leftover of leather, is characterized by comprising the following steps: the method comprises the following steps:
1) placing the chromium-containing blue wet leather made of leather leftovers: placing the wet leather containing chrome blue from the leather leftovers into the pool.
2) And (3) soaking the skin: adding lime milk, and filling 3% of the lime milk into the pool; adding sodium hydroxide solution, and adding 3% sodium hydroxide solution into the pool for skin soaking.
3) Sealing and placing: and placing the chrome blue wet leather leftover subjected to leather soaking treatment into a closed pool, and then sealing the pool for 3 to 15 days.
4) Cleaning treatment: and (3) putting the chrome blue wet leather which is stuffy and reddish leather leftovers into a device capable of rotating and washing with water, recycling the water for washing until the pH value of the chrome blue wet leather which is leather leftovers is neutral.
5) And (3) dechromization treatment: adding 1 to 3 percent of sulfuric acid for dechromization soaking and washing, and adding water for washing after the chromium in the chromium-containing blue wet leather leftovers of the leather is dechromized and qualified.
6) Removing and kneading and expanding treatment: adding 1-3% sodium hydroxide solution into the dechromized peels, fully expanding the peels, adding water for washing, and washing until the pH value is neutral.
7) Mincing and heating: mincing the swelled skin with a meat mincer, adding water into the minced skin, boiling the glue, and stopping stirring and heating when the concentration of the glue solution reaches 3-8%.
8) And (3) filtering and concentrating: pumping the supernatant of the glue solution into another container, adding a flocculating agent for flocculation, introducing the flocculated mixture into a bag filter for filtration, filtering and concentrating the filtered glue solution by using a membrane, and returning the water filtered by the membrane for recycling.
9) Collecting and packaging: after the glue solution with the concentration of 35-50% enters a film scraper evaporator and is steamed to a high-concentration solution with the concentration of 55-70%, the glue solution of the high-concentration solution is put into a strip extruding machine for extruding strips, and the extruded strips are put into a belt type (fixed bed type) dryer for drying, crushing and packaging for sale.
2. The method for producing industrial gelatin by using chromium-containing blue wet leather as leather leftovers instead of grey leather as claimed in claim 1, wherein the method comprises the following steps: the liquid level in the second step is higher than the upper surface of the wet leather containing chrome blue of the leather leftovers.
3. The method for producing industrial gelatin by using chromium-containing blue wet leather as leather leftovers instead of grey leather as claimed in claim 1, wherein the method comprises the following steps: and in the step eight, the filtering times are repeated until the supernatant liquid of the glue solution does not have flocculated flocculates.
4. The method for producing industrial gelatin by using chromium-containing blue wet leather as leather leftovers instead of grey leather as claimed in claim 1, wherein the method comprises the following steps: in the second step, the ph of the solution in the pool is 10-12, and the soaking time is 4 hours plus or minus 20 minutes.
5. The method for producing industrial gelatin by using chromium-containing blue wet leather as leather leftovers instead of grey leather as claimed in claim 1, wherein the method comprises the following steps: and the pH of the solution in the dechromization treatment in the step five is 7-9, and the soaking time is 4 hours plus or minus 20 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110396690.7A CN113698873A (en) | 2021-04-13 | 2021-04-13 | Method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather leftover |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110396690.7A CN113698873A (en) | 2021-04-13 | 2021-04-13 | Method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather leftover |
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| CN113698873A true CN113698873A (en) | 2021-11-26 |
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| CN202110396690.7A Pending CN113698873A (en) | 2021-04-13 | 2021-04-13 | Method for producing industrial gelatin by replacing grey leather with chromium-containing blue wet leather leftover |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048548A (en) * | 1990-06-15 | 1991-01-16 | 叶志远 | Produce industrial getatin by alburnums of blue vitriol leather |
| CN1136581A (en) * | 1996-03-31 | 1996-11-27 | 叶志远 | Pre-treatment technology for producing gelatin by using even peeling leather waste of blue vitriol leather as raw material |
| CN1481427A (en) * | 2000-12-22 | 2004-03-10 | �����ᡤ�ֶ����幫˾֮�����ṫ˾ | Process for gelatines extraction and chromium salts recovery from tanned hides and skins shavings |
| CN109796878A (en) * | 2019-01-24 | 2019-05-24 | 河北先达环保工程有限公司 | The method that leftover pieces prepare industrial gelatine and industrial proteins powder is discarded using leather |
-
2021
- 2021-04-13 CN CN202110396690.7A patent/CN113698873A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048548A (en) * | 1990-06-15 | 1991-01-16 | 叶志远 | Produce industrial getatin by alburnums of blue vitriol leather |
| CN1136581A (en) * | 1996-03-31 | 1996-11-27 | 叶志远 | Pre-treatment technology for producing gelatin by using even peeling leather waste of blue vitriol leather as raw material |
| CN1481427A (en) * | 2000-12-22 | 2004-03-10 | �����ᡤ�ֶ����幫˾֮�����ṫ˾ | Process for gelatines extraction and chromium salts recovery from tanned hides and skins shavings |
| CN109796878A (en) * | 2019-01-24 | 2019-05-24 | 河北先达环保工程有限公司 | The method that leftover pieces prepare industrial gelatine and industrial proteins powder is discarded using leather |
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Application publication date: 20211126 |