Process for producing gelatin by using acid method

Abstract

The invention discloses a process for producing gelatin by using an acid method. The process comprises the following steps of: selecting appropriate leather, and washing and mechanically degreasing the leather; soaking the leather into food-grade hydrochloric acid, washing the acid soaked raw material for at least two times, slowly performing neutralization reaction by using sodium hydroxide, extracting gelatin, adding a flocculating agent when the gelatin is treated, and performing flocculating settlement; and filtering the settled material through a cotton cake filter, performing ion exchange to remove metal ions and acid radical ions after the filtrate is obtained, performing membrane ultra-filtration concentration on the filtrate, performing three-effect evaporation and flash sterilization, extruding the gelatin, and thus obtaining a gelatin finished product. By the process, the whole production period is shortened, the quality of the product is improved, the water consumption during washing is reduced, and the unit consumption of the leather in production is reduced.

Description

technical field [0001] The invention relates to a production method of gelatin, in particular to a process for producing gelatin by an acid method. Background technique [0002] Gelatin: water-soluble protein mixture, produced by partial hydrolysis of collagen in skin, ligaments, and tendons by acid or alkali or boiling in water, colorless or yellowish transparent brittle flakes or coarse powder, formed by swelling in water at 35-40°C Gel (water content is 5-10 times of its own weight). It is a nutritionally incomplete protein that lacks certain essential amino acids, especially tryptophan. [0003] Source of gelatin: Cowhide and pigskin are used as raw materials, using a full set of stainless steel equipment, strictly screened, and made through dozens of process lines such as repeated washing, degreasing and neutralization, cooking and liquefaction, sterilization and filtration, concentration and drying. The produced gelatin is an odorless, colorless (slightly light yello...

AI Technical Summary

Problems solved by technology

[0008] The basic process in the same industry is currently adopted by most gelatin companies in China. Its disadvantages are: first, the water consumption is 160-180 tons per pond; second, it produces more polluted water; It takes 7 to 13 days for liming, washing, and rubber extraction to finish the finished product. The third is that the yield of rubber extraction is low, and the unit consumption of each ton of rubber material is more than 14 tons. The fourth is that the heavy metal content in liming (lime) is high. After gluing, the residual amount of heavy metals in the glue solution is relatively high, and it is difficult to deal with in the post-process

Its characteristics are: soaking at a higher pH value will cause the leather tissue layer and fat layer to soften and swell, resulting in more fatty substances and colloidal floating matter, which will affect post-treatment and sewage treatment, and the production cycle of liming 12 days to 17 days, after the improvement, the shortest time is about 96 hours for alkali soaking, the cleaning time is long, the water consumption is large, and the unit consumption cost is high