The polytetrafluoroethylene hollow fiber membrane contactor natural gas purification technology jointly developed by the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences and Nanjing Bidun New Membrane Technology Co. has won the first prize of the 2019 Dalian Municipal Technology Invention Award.

   Polytetrafluoroethylene hollow fiber membrane membrane contactor technology is the coupling of membrane technology and traditional absorption process, in the gas-liquid two phases do not directly contact the premise of interphase mass transfer, which fundamentally avoids the traditional absorption tower process of bubbling, liquid flooding, mist entrainment and other drawbacks, and has the advantages of a large specific surface area, small size of the equipment, high mass transfer efficiency, good flexibility in the operation of good, good prospects for application in the field of gas absorption and purification. . Membrane is the core and key of membrane contactor process, its nature and performance directly determine the technical economy and practicality of membrane contactor process. Polytetrafluoroethylene (PTFE) material has excellent hydrophobicity, mechanical strength, chemical stability and wettability resistance, is the most ideal membrane material for membrane contactor process, but due to the "insoluble and non-molten" nature, it can not be prepared by the traditional method of membrane production, Dalian Institute of Chemical Technology has adopted patented technology to prepare the pore size uniformity of different specifications. Dalian Institute of Chemical Technology uses a patented technology to prepare PTFE products with uniform pore size and different specifications, the finest of which can reach 0.8mm and can be mass produced.

    In 2017, the technology was successfully transformed, industrial amplification in Nanjing, mass production of PTFE hollow fiber membrane. At present, PTFE membranes produced by Nanjing Zhongke Bidun New Membrane have been applied in the field of material concentration, high ammonia nitrogen wastewater treatment, concentration of highly concentrated brine, and degassing.