Abstract
A hybrid process that combines a vapor permeation process with a recently developed membrane-based absorption and stripping process using an inert essentially nonvolatile absorbent oil is described here for a very high degree of removal of volatile organic compounds (VOCs) from vented gas streams. The combined and continuous process of this study uses the same utility, a vacuum pump, and achieves a very high level of VOC removal, for example, 99.57–99.97% from a N 2 feed stream containing 6,000 ppmv of methylene chloride. The performance is illustrated here using hollow fiber membrane modules of two kinds: microporous polypropylene hollow fibers having an ultrathin nonporous silicone coating used for vapor permeation first and then later for regenerating the VOC-loaded absorbent by VOC stripping via vacuum; micreoporous polypropylene hollow fibers without any nonporous coating for nondispersive absorption of VOCs from the waste gas stream.
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