Amylase and protease mixed depilation method in leather production

Abstract

A method provided by the invention selects suitable amylase and protease for amylase and protease mixed depilation, which utilizes advantages of good depilation effect of protease and good security of amylase. The combination of amylase and protease has synergistic effect, and can reduce the dosage of enzyme; especially, amylase is employed to undertake part of the job of protease, so as to reduce action intensity of protease and reduce skin damage; and hydrolysis of polysaccharide chain by amylase is utilized to play the role of loosening fibers. The product is a compound enzyme preparation, and can be used for a hair removal process in leather production.

Description

technical field [0001] The unhairing process is a necessary step in leather production, but the traditional sulfide unhairing pollutes the environment seriously. Enzymatic depilation can reduce pollution, but the protease usually used causes considerable damage to the skin collagen itself. The invention uses carbohydrase and protease to remove hair, can reduce the amount of protease, thereby reducing the damage of protease to leather, and has good hair removal ability. The invention is applied in leather production. Background technique [0002] Depilation in tanning is the process of removing hair and epidermis from the dermis by physical, chemical or biological treatment. At the same time, the collagen fibers of the rawhide contain a lot of soluble protein and fibrous interstitium. After drying, they stick the fibers together, making the rawhide hard and not resistant to bending. Therefore, these fibrous interstitials must be removed during the depilation process. Loose...

AI Technical Summary

Problems solved by technology

What is especially troublesome is that when treating tannery wastewater, because sulfide can inhibit the growth of microorganisms, when the concentration is too high, it may even destroy the entire flora, resulting in difficulties in wastewater treatment

[0006] ②Organic matter: A large amount of hair and epidermis are degraded during depilation, wasting resources, increasing COD and BOD in a large amount, causing eutrophication of water quality, and affecting the growth of aquatic organisms

[0007] ③Solid lime: A large amount of lime is in an undissolved state and has not been fully utilized. Direct discharge will increase the alkalinity and TDS. Lime and slag may even block the pipeline

[0023] However, protease depilation will inevitably damage the structure of the dermis and affect the performance of leather products, which seriously affects the application of enzymatic depilation