A membrance compressor is a type of positive displacement compressor. It works by the back-and-forth motion of a diaphragm driven by a crankshaft mechanism. It is a compact and reliable compressor suitable for use with inert gases or compressed natural gas. It can be used in applications where the process requires working with toxic or inert gases, such as medical and laboratory equipment. It is available as a hermetic or semi-hermetic unit. A hermetic compressor uses a one-piece welded steel casing that cannot be opened for repairs; a semi-hermetic unit has a case with screws that can be removed for access to the compressor motor and compressor components.
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During the compression process b – c, the pressure of the gas in the working cavity increases from the suction P1 pressure to the discharge pressure P2. The volume of the gas in the working cavity VBC is compressed to the injection volume NGVNG. At the end of this phase, the injection valve opens.
The organic component of the second gas is separated from the other gases by condensation (stream 107). The cooled organic liquid may be recovered at high purity (up to 95% purity). The separation/recovery process is often performed in combination with compression/membrane hybrid processes. This allows the use of a lower compressor package for a given amount of expenditure of compression horsepower, and also improves the recovery/recovery efficiency of the process by reducing the load on the first compression stage of the compressor train.
