Abstract
SAPO-34 membranes were synthesized in stainless steel autoclaves and teflon autoclaves with water bath, ice/water bath and flowing water cooling towards N2/CH4 separation. The best membrane displaying unprecedented N2 permeance of ~2600GPUs and N2/CH4 separation selectivity of 7.4 was prepared in the stainless steel autoclave with a water bath cooling. A more selective membrane with a N2/CH4 selectivity of 8.6 and N2 permeance of ~2150GPUs was also prepared in the stainless steel autoclave but with an ice/water bath cooling. The heat flux rate of the stainless steel autoclaves during membrane preparation was ~two orders of magnitude higher than that of the membranes prepared in conventional teflon autoclaves. The higher heat flux rate decreased the gel temperature faster, and slowed the kinetics of crystal growth. The slow crystal growth rate during the cooling translated into thinner and more permeable membranes. These SAPO-34 membranes may have great potential for economic N2 rejection from natural gas.
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