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Another new breakthrough in the field of gas separation
2017-03-03682
Gas filtration and separation equipment, which can finally separate the gas into oxygen, nitrogen and other useful gases through liquefaction, distillation and other processes The PIM hollow fiber asymmetric membrane of Yubu Xingchan company has been successfully used to separate nitrogen and oxygen in the air. The oxygen enriched membrane (30-35%) is mainly used in medical first aid, boiler combustion support and chemical oxidant. The nitrogen is mainly used in explosion-proof atmosphere of inflammable and explosive warehouses such as petrochemical site, dehumidification membrane for vehicle brake pad, etc. Recently, it has been found that injecting nitrogen into coffee and other beverages can play a role of smooth and tongue touching, so a nitrogen generator for this field has been developed.
In the United States, by the end of May this year, more than 500 coffee shops had sold the beverage in seven major cities, including New York alone, with the potential to spread. Another important use is to separate and recover CO2 through CO2 filtration equipment. In order to restrain the warming of the earth, it has become an important topic to reduce and utilize the CO2 emissions. Some steel plants and power plants in Japan have used the CO2 recovered from PIM hollow fiber separation device for the carbonylation synthesis of chemical plants and other C1 (one carbon chemistry) aspects.
The PIM hollow fiber membrane is creatively used in wastewater filtration system and gas filtration system by SDL and Evonik to treat and utilize the high concentration methane gas discharged from wastewater treatment plant, food plant and livestock production facilities. In South Korea, the company has built a large-scale power generation project by using methane gas extracted from Seoul wastewater treatment plant, and expanded its application overseas for oil field natural gas refining plants, and developed hfgsm for hydrogen production to expand its application in the energy field.
Using hollow fiber carbon membrane, Japan Institute of industrial technology has developed the ultra-high purity hydrogen refining technology used in organic hydride hydrogen stations to meet the needs of high-pressure hydrogen stations for hydrogen fuel vehicles of Toyota Motor and other companies. After wet spinning with sulfonated polyphenylene ether, the hollow fiber was treated specially and carbonized for 1 h at 600 ℃, 650 ℃ and 700 ℃ respectively.
In the College of Shankou University, PIM hollow fiber membrane was heat-treated in the active gas above 500 ℃, and then heat-treated at 700 ℃ and 800 ℃ to prepare hollow fiber carbon membrane with nano pores. This membrane has good selective permeability to hydrogen, and can also be used for the preparation of high-purity hydrogen.
The selective separation of CO2 / N2 by polysulfone asymmetric membrane and polyethylene oxide (PEO) modified PIM membrane was studied and compared with molecular sieve membrane and mixed matrix membrane.
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