Preparation And Natural Gas Dehydration Performance Of Polymer Mixed Matrix Membrane

With the gradual excavation of natural gas in the deep sea area,natural gas has received more and more attention,but the presence of water vapor in the natural gas has caused corrosion of pipelines and equipment during the transportation from the deep sea area to the inland,and also caused hydrate formation and freezing.Therefore,natural gas must be dehydrated during transportation.There are many gas separation methods.Among them,membrane separation technology has many advantages such as high stability,low cost,simple preparation,high efficiency and ease of use,etc.,and has been widely concerned.The key technology is membrane material.In the membrane separation technology,the mixed matrix membrane has been widely used in the field of gas separation due to its characteristics of combining inorganic membranes and organic membranes while breaking through the selectivity-permeability tradeoff.However,the research of mixed matrix membranes for natural gas dehydration has not been seen so far.Report.This paper uses phase-inversion method to put KAUST-8 and MOF-801-P two MOF materials and rubbery polymer cellulose acetate（CA）into compound to prepare mixed matrix membrane.and the scanning electron microscope（SEM）,X-ray diffraction（XRD）,BET specific surface analysis,Fourier infrared absorption spectroscopy（FT-IR）,thermogravimetry The analysis（TG）method was used to characterize,and finally a series of characterization and testing were conducted to investigate the natural gas dewatering performance.The results show that the natural matrix water removal performance of the mixed matrix membrane is greatly improved compared with the pure cellulose acetate membrane.In the same kind of MOF-based mixed matrix membrane,the H₂O/CH₄gas separation rate of the double-layer mixed matrix membrane is higher than that of the single-layer mixed matrix membrane.For mixed matrix membranes with the same number of layers,the H₂O/CH₄ gas separation rate of the mixed matrix membrane with dense surface and uniform MOF distribution is higher than that of the mixed matrix membrane with pores on the surface.The overall gas permeability of MOF-801-P/mixed matrix membrane and the separation rate of H₂O/CH₄ gas are higher than the corresponding values of KAUST-8/cellulose acetate mixed matrix membrane,and the separation performance is more outstanding.Typically,the MOF-801-P/cellulose acetate mixed matrix membrane with a MOF loading of 15 wt%has a H₂O/CH₄ gas separation rate of up to 324.93.