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Depilating composition for less thiolase process and the water bath depilation method therewith

A technology of depilatory composition and sulfur-reducing enzyme, which is applied in food science, slaughtering accessories, slaughtering, etc., can solve the problems of difficult process control, phenolic substance pollution, difficult hair recycling, etc., and achieve significant economic and social benefits , reduce COD and BOD5, and reduce the effect of pollution control costs

Inactive Publication Date: 2004-09-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the amount of 1398 enzyme is greater than 0.4%, and the amount of sodium sulfide is 0.5% (Wang Jiangen, Zhang Zhongyu, Chen Chaoying, etc. Research on depilation technology with less sodium sulfide enzyme. "China Leather", 2001, 30 (5): 29-32), this The operation of this method is more loaded down with trivial details, and the consumption amount of sodium sulfide is also higher, and has also brought the pollution of phenolic substance, and the hair that takes off is difficult to recycle.
[0005] Chinese patent 90101445.1 "Ash Enzymatic Hair Removal New Technology for Thoroughly Solving Sulfur Pollution", 88103066.X "Triisopropanolamine Hair Removal New Technology" and 85102770 "Triethanolamine Hair Removal Technology" all use other chemical substances instead of sulfide hair removal, only In the first patent, protease is used to remove hair under the action of lime to completely replace sulfide and solve the problem of sulfur pollution. However, it is difficult to control the process, and it is prone to incomplete hair removal or rotten surface.
In the latter two patents, organic amines are used instead of sulfides for hair removal, but there are pollution problems and even toxicity problems of organic amines
There are no patent reports on low-sulfur assisted enzyme hair removal technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Depilation of pigskin

[0028] Add 100kg of pig skin to be depilated into the drum, add 160kg of water with a water temperature of 36-38°C, add 2kg of sodium bicarbonate and C 12 -C 18 Fatty alcohol polyoxyethylene ether 0.5kg, rotate for 30 minutes, add NH 4 Cl 1.3kg rotated for 30 minutes, added 0.4kg of 1398 protease, controlled the temperature at 34-3g°C, rotated for 60 minutes, added Na 2 S Turn 0.3kg for 60 minutes, add lime 3kg and rotate for 60 minutes, stop for 60 minutes, add H 2 o 2 Rotate at 0.2kg for 30 minutes, then combine rotation and stop, rotate for 5 minutes per hour, rotate 5 times in total, stop the drum overnight, and the total time is 20-24 hours.

[0029] Before adding sodium sulfide, remove the hair balls in the drum, one is to reduce the consumption of sulfide, and at the same time avoid the high content of COD and BOD caused by the dissolution of hair 5 .

[0030] The hair is completely removed, and the skin is clean and s...

Embodiment 2

[0031] Embodiment 2: depilation of pigskin

[0032] Put 100kg of pig skin to be depilated into the drum, add 200kg of water with a water temperature of 36-38°C, and add C 8 -C 12 Alkylphenol polyoxyethylene ether 0.6kg and sodium bicarbonate 1kg, rotate for 30 minutes, add NH 4 Cl 1.2kg, rotate for 30 minutes, add 166 protease 0.5kg and NaHS 0.5kg, control the temperature inside the drum at 34-38°C, rotate for 60 minutes, add lime 3kg, rotate for 60 minutes, stop for 60 minutes, then rotate and stop combined, rotate every hour 5 minutes, a total of 5 rotations, stop the drum overnight, and the total time is 18-22 hours.

[0033] The hairballs were removed from the drum before the NaHS was added.

[0034] The depilation is complete, and the skin is off-white and soft.

Embodiment 3

[0035] Example 3: Depilation of goatskin

[0036] Put 100kg of goat skin to be depilated after soaking in water and de-fleshing into the drum, add 200kg of water with a water temperature of 36-38°C, and add C 12 -C 18 0.2kg of fatty alcohol polyoxyethylene ether, 0.3kg of sodium dodecylbenzenesulfonate and 2kg of sodium bicarbonate and rotate for 30 minutes, add 0.8kg of ammonium chloride and rotate for 30 minutes, add 0.5kg of 1398 enzyme and 0.35kg of NaHS and rotate for 100 minutes (control the temperature around 36°C), add 3kg of lime and rotate for 60 minutes, add H 2 o 2 Rotate 0.6kg for 30 minutes, then combine rotation and stop, rotate for 5 minutes per hour, rotate 5 times in total, stop the drum overnight, and the total time is 18-22 hours.

[0037]After adding enzymes, a large amount of hair falls off and rolls into hair balls, so the hair balls should be removed before adding sodium hydrogen sulfide. After depilation, the leather surface is white and clean. A...

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PUM

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Abstract

The present invention is depilating composition for less thiolase process and the water bath depilation method therewith. The water bath depilation method features the depilation process including placing leather blank after soaking, eliminating meat and fat into rotating drum; adding water, surfactant and sodium bicarbonate and rotating for 30 min; adding ammonium chloride and rotating for 30 min; adding proteinase and rotating for 60-120 min; adding sodium sulfide and rotating for 60 min; adding hydrogen peroxide and rotating for 30 min; rotating 5 times for 5-10 min each in each hour; and stopping for one night to complete the water bath depilation process, with the total period being 15-24 hr. The said method has good depilation effect, can disperse fiber further and make leather soft and light colored. In addition, the said process has less sulfide pollution and its effluent has low COD and low BOD5.

Description

1. Technical field [0001] The invention relates to a sulfur-less enzyme depilatory composition and a water bath depilatory method thereof, which belong to the technical field of leather engineering. 2. Background technology [0002] Traditional animal skins such as sheepskin, cowhide and pigskin are mainly depilated by the soda sulfide method. The sheepskin is made of soda sulfide and lime into a paste and applied to the meat surface of the skin. After stacking for a certain period of time, the hair is pushed manually; Pigskin and the like are destroyed in a water bath with soda sulfide and lime in a drum. Therefore, there are serious pollution problems, including sulfide, lime, and a large amount of COD and BOD produced by the dissolution of wool 5 and SS. [0003] At present, tanneries generally adopt the traditional ash-alkali method for hair removal. This method has good hair removal effect, stable quality, and mature technology, but it will produce a large amount of d...

Claims

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Application Information

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IPC IPC(8): A22B5/08
Inventor 张宗才戴红夏志富殷强峰
Owner SICHUAN UNIV
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