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Method for leather-making with Co2 supercritical fluid as medium

A supercritical fluid, carbon dioxide technology, applied in chemical treatment before tanning, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. The problems of unfavorable industrial production of leather technology, no public reports, large volume and energy consumption, etc., achieve the effect of significant cleanliness, reduction of processing time, and reduction of energy consumption

Inactive Publication Date: 2005-09-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although there have been some relevant reports on the use of carbon dioxide supercritical fluids in leather degreasing, tanning, dyeing, and fatliquoring, in the reported documents, entrainers are generally required, and their usage reaches 10% of the skin weight. , this is a very large amount, and the entraining agent includes water and other organic matter, which inevitably brings pollution, which makes the advantages of carbon dioxide supercritical technology weakened. In addition, in the reported carbon dioxide supercritical fluid tanning process The amount of tanning reagents used and the energy consumption are relatively large, which is also very unfavorable for the industrial production of carbon dioxide supercritical fluid tanning technology
There is no published report about the leather enzyme depilation technology in carbon dioxide supercritical fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: CO 2 Depilation and Softening of Bacillus subtilis SA1.398 Neutral Protease in Supercritical Fluid

[0027] Features: Bacillus subtilis SA1.398 neutral protease, 250 activity units / gram skin

[0028] Material:

[0029] fresh pork rind, neck

[0030] Bacillus subtilis SA1.398 neutral protease: 250 units / gram skin

[0031] Water: 2%

[0032] Time: total time: 285min, including 150min under 7.4-8.0Mpa pressure for degreasing, hair removal and softening conditions:

[0033]Temperature: 34°C-38°C, Pressure: 7.4-8.0MPa, Speed: 48 rpm

[0034] operate:

[0035] 1. Dissolve the required enzyme with the required water and put it into the reactor together with the pig skin. Adjust the temperature to about 35°C. Pressure: about 7.5MPa, rotate for 150min. Pressure relief, cooling to normal pressure, normal temperature, the total time of enzyme action is 285min;

[0036] 2. Mechanical hair pushing

[0037] result:

[0038] 1. Check at the end of the reaction: ...

Embodiment 2

[0040] Example 2: CO 2 Depilation and Softening of Bacillus subtilis SA1.398 Neutral Protease in Supercritical Fluid

[0041] Features: Bacillus subtilis SA1.398 neutral protease, 200 units / gram skin

[0042] Material:

[0043] Salted pork rind, neck (rehydrated to fresh),

[0044] Bacillus subtilis SA1.398 neutral protease: 200 units / gram skin

[0045] Water: 2%,

[0046] Time: The total time is 350min, of which 100min is reacted under the pressure of 7.4-8.0MPa for hair removal and softening conditions:

[0047] Temperature 34°C-36°C, pressure: 7.4-8.0Mpa, speed: 48 rpm

[0048] operate:

[0049] 1. Dissolve the required enzyme with the required water and put it into the reactor together with the hide. Adjust the temperature to 35°C, adjust the pressure to about 7.5MPa, and rotate for 100min. Relieve the pressure, cool down to normal pressure and temperature, and the total time for enzyme action is 350min.

[0050] 2. Mechanical hair pushing

[0051] result:

[00...

Embodiment 3

[0054] Example three: CO 2 Depilation and Softening of Bacillus subtilis SA1.398 Neutral Protease in Supercritical Fluid

[0055] Features: Bacillus subtilis SA1.398 neutral protease, 150 units / gram skin

[0056] Material:

[0057] fresh pork rind, neck

[0058] Bacillus subtilis SA1.398 neutral protease: 150 units / gram skin

[0059] Water: 2%

[0060] Time: The total time is 240min, of which the reaction is 70min under the pressure of 7.5-8.0Mpa for degreasing, hair removal and softening conditions:

[0061] Temperature: 35°C-36°C, Pressure: 7.5-8.0Mpa, Speed: 48 rpm

[0062] operate:

[0063] 1. Dissolve the required enzyme with the required water and put it into the reactor together with the leather, adjust the temperature to 35°C, adjust the pressure to 7.8MPa, rotate for 70min, release the pressure, cool down to normal pressure and temperature, and the total time of enzyme action is 240min

[0064] 2. Mechanical hair pushing

[0065] result:

[0066] 1. Check at ...

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PUM

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Abstract

The present invention provides one kind of tanning method with supercritical CO2 fluid as medium, and the tanning method adopts supercritical CO2 fluid as medium for at least one step of degreasing, enzyme depilation, softening, tanning, dyeing, fatting, etc. During the said operation, no entrainer is sued basically, and the treating course with supercritical CO2 fluid can lower the temperature to 33 deg.c, lower the pressure to 7.4 MPa, shorten the treating period to 60 min and decrease power consumption.

Description

field of invention [0001] The invention relates to a tanning method using a carbon dioxide supercritical fluid as a medium. Specifically, the invention relates to a tanning method in which the carbon dioxide supercritical fluid used for enzymatic hair removal is used as a medium in the depilation process. Background technique [0002] Leather industry is an important chemical industry, but also a traditional industry that produces serious environmental pollution. To eliminate pollution in the tanning industry, two strategies are usually adopted: pollutant treatment and clean production process. Obviously, the clean production process that eliminates pollution in the production process is the main method to fundamentally control pollution. The pollution-free tanning technology using carbon dioxide supercritical fluid as a medium is a new method proposed under this background. [0003] Supercritical fluid (super critical fluids) technology is a new chemical extraction and sep...

Claims

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Application Information

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IPC IPC(8): C14C1/06
Inventor 李志强廖隆理冯豫川陈敏
Owner SICHUAN UNIV
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