Generally, there are many methanol in chemical shops, chemical stores, chemical plants and coking plants. These plants all produce refined alcohol, which is 99.9% in content, such as crude alcohol, while waste alcohol is leftover from some factories, such as fertilizer plants, pharmaceutical factories, pesticide plant, etc. The quality of these wastes is uneven and needs to be tested, such as color, smell, carbon deposition, corrosion and residue.