Method for extracting collagen fibers from offal produced during tanning process

Abstract

The invention discloses a method for extracting collagen fibers from offal produced during a tanning process. At present, the offal produced during the tanning process is treated through a chemical treatment method which has the defects that though the product added value is higher, the treatment is complex, the cost is high, secondary pollution is generated, the offal utilization ratio is low, and a great quantity of leather waste cannot be effectively utilized all along. The method provided by the invention comprises the following steps: selecting blocky wet blue leather scrap, immersing the wet blue leather scrap in soda lye for 36 to 48 hours, treating the tumefied wet blue leather scrap with ultrasonic equipment for 20 to 30 min, passing the wet blue leather scrap through a high-pressure water jet device slowly, drying, and finally beating and opening through a cotton carding machine to ensure complete separation between the collagen fibers and obtain the collagen fibers. The invention mainly adopts the physical and mechanical method, so as to ensure that trivalent chromium cannot be converted into poisonous hexavalent chromium; environment pollution is avoided; and the extraction rate of collagen fiber approximately reaches 70 percent.

Description

[0001] technical field

[0002] The invention relates to the treatment of leather waste produced in the tanning process, in particular to a method for extracting collagen fibers from the leftovers produced in the tanning process. Background technique

[0003] my country's traditional tanning industry is mainly based on the blue leather process. In the entire tanning production process, the final product made only accounts for about 50% of the original leather weight, and the rest is a large amount of tanning waste. As a big country in tanning, my country produces more than 1.4 million tons of leather waste (including chrome-containing leather waste) every year, accounting for almost one-half of the world's total. , the amount of tanning solid waste is also increasing. Most of the waste is the dregs and dander produced during the processing of blue leather, such as trimming and smoothing. The main component is collagen. If it is not utilized Discarding not only wastes resource...