1. Swiss separation equipment technology co., ltd: this company is a high-tech enterprise in Henan province with independent intellectual property rights. The company has established a provincial solid control technology research and development center in Puyang, Henan.

2. Shanghai Dingyi Petrochemical Equipment Manufacturing Co., Ltd.: This company is committed to the engineering design, equipment manufacturing, complete systems and after-sales service of gas, liquid and powder treatment in petroleum, chemical, food and medicine industries, and builds a competitive engineering solution center.

3. Liaoyang Guancheng Machinery Co., Ltd.: The DHZ series disc centrifuge equipment produced by this company is suitable for the separation of mixed solution of concentrated sulfuric acid and paraffin oil in the process of refining concentrated sulfuric acid.