Ammonia nitrogen-free leather-making deliming agent and preparation method thereof

Abstract

The invention discloses an ammonia nitrogen-free leather-making deliming agent and a preparation method thereof. The method comprises the following steps of: mixing 60 to 80 mass parts of organic acid A, 15 to 30 mass parts of organic acid B and 5 to 30 mass parts of inorganic salt; and mechanically crushing until the granularity is 80 to 100 meshes, adding 1 to 10 mass parts of aids and uniformly mixing to obtain the ammonia nitrogen-free leather-making deliming agent. The deliming agent does not contain ammonia nitrogen materials, the ammonia nitrogen content of the waste liquid and chemical oxygen demand (COD) content after deliming are respectively reduced by over 80 percent and 20 percent compared with those of the conventional process, no irritant gas is generated in the deliming process, safety production of an operator is facilitated, and the deliming agent is a clean leather-making aid, and has great popularization and application prospect.

Description

technical field [0001] The invention belongs to the production of leather chemicals, and in particular relates to an ammonia nitrogen-free leather deliming agent and a preparation method thereof. Background technique [0002] my country's economy has developed rapidly in recent years, and its economic aggregate ranks among the top in the world. However, the rapid development model centered on economic construction has brought a series of environmental pollution problems. Among industrial production pollution, the most harmful and most socially repercussed is the pollution caused by industrial production, especially water pollution. According to data from the State Environmental Protection Administration, since the "Songhua River Water Pollution" incident in 2005, China has had an average of one water-related pollution incident every two or three days. China's environmental situation is not optimistic. Seventy percent of the pollution incidents in our country are water pollu...

AI Technical Summary

Problems solved by technology

The price of ammonium salt deliming agent is low, and its performance is stable, but ammonia gas is released during the deliming process, which will stimulate the respiratory system of the operator. At the same time, the wastewater contains a large amount of ammonia nitrogen, which causes the ammonia nitrogen index of the wastewater to seriously exceed the standard, so it is unnecessary to use it. Ammonia nitrogen organic acid deliming agent will become the direction of deliming and cleaning in tanning