Jiangsu union SK static mixer is made of left and right twisted spiral pieces with single channel. The nonuniformity coefficient of liquid-liquid phase and liquid-solid phase is σ x ≤ 1-5%. Application fields: SK static mixer is suitable for mixing, reaction, extraction, absorption, injection molding, color matching, heat transfer and other processes of chemical, petroleum, pharmaceutical, food, fine chemical, plastic, environmental protection, synthetic fiber, mining and metallurgy departments, especially for high viscosity medium with small flow and impurity or viscosity ≤ 106 centipoise. Case study: 1. Application in the asphalt removal unit with propane as solvent The SK static mixer of propane deasphalting unit in a domestic plant takes vacuum residue as raw material and liquid phase propane as solvent to carry out liquid-liquid extraction to produce high viscosity lubricating oil as catalytic cracking raw material. At the same time, asphalt is mentioned to achieve good residue dilution, improve oil recovery, reduce solvent ratio and save energy consumption. 2. Application of SK static mixer in the chlorination process of pulp A domestic paper mill has applied SK type static mixer produced by Jiangsu younet, the chlorine content has reached the technological requirements, and the quality of bleached pulp has been guaranteed. Due to the full dispersion, reaction, complete absorption of chlorine in the pulp, the production is normal, without chlorine overflow, the production environment has been improved, and the high quality rate of the pulp has been raised.