Synthetic leather is the product of polyurethane impregnation and coating with high-density woven fabric (non-woven) as the base fabric. Due to the rapid expansion of the application field of synthetic leather products and the high added value of products, its production scale has gradually expanded, but the resulting exhaust emissions and environmental problems have also gradually become prominent. Therefore, it is of great practical significance to adopt economic and practical treatment technology and develop appropriate process flow to make the exhaust emission indicators of many synthetic leather plants meet the national standards.

The main source of waste gas in synthetic leather production is the volatilization of organic solvents, including the volatilization of resins and solvents during batching, transportation and storage; Volatilization of organic matter during processing such as coating or soaking; Volatilization of organic matter when heating in the oven; Volatilization of organic matter during post-treatment. The waste gas pollutants are related to the specific process and formula composition. The formula of a certain process can often be changed, so the specific pollutants produced are not fixed. Common organic solvent pollutants in the production process of dry process include: DMF, toluene, xylene, butanone, etc; DMF is the common organic pollutant in the production process of wet process.

Dimethylformamide (DMF) as a solvent has increased sharply in recent years. It is widely used. It is mainly used as a solvent or intermediate raw material for polymer synthesis, especially as a spinning solvent for polypropylene acrylic fiber. It is also used as a treatment solvent for polyurethane resin in the manufacture of artificial leather or leather (or PVC fabric, laser leather, waterproof cloth) surface materials. It is also used as a solvent for the separation and extraction of petroleum products such as ethylene and butene Acetylene recovery and solvent of insect proof and rust proof coating. Dimethylformamide is a moderately low toxic substance, which can invade the body through the respiratory tract, skin and digestive tract, causing toxic reactions.