Degassing liquids: apparatus and method
AssigneeHoechst Celanese Corporation
InventorsKwantai Cho, Xiaoyan Huang
Life of this patent
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Abstract
The present invention is directed to a microporous membrane contactor for degassing liquids at temperatures greater than (>) 60.degree. C. and at pressures greater than or equal (.gtoreq.) to 40 psig. The contactor has a microporous hollow fiber membrane adapted to withstand collapse and resist appreciable pore shrinkage or pore closure when subjected to liquid temperatures greater than (>) 60.degree. C. and liquid pressures greater than or equal to (.gtoreq.) 40 psig for a period of greater than or equal to (.gtoreq.) 30 days. A housing encloses the membrane.
Claims17
A method for degassing liquids at a temperature equal to 60.degree. C. and having dissolved or entrained gas therein comprising the steps of:
- providing a microporous membrane contactor having a nucleated polyolefin hollow fiber membrane having good dimensional stability above 60.degree. C. and 40 psig;
- and
- degassing the liquid by removing the dissolved or entrained gas across the membrane.
A method for degassing water at a temperature equal to 60.degree. C. and at a pressure of equal to or greater than 40 psig and having dissolved or entrained gas therein comprising the steps of:
- providing a microporous membrane contactor having a plurality of polypropylene hollow fiber membrane with a wall thickness of at least 50 microns and a crystallization temperature greater than or equal to 125.degree. C.;
- and
- degassing the water by removing the dissolved or entrained gas across the membrane.
A microporous membrane contactor for degassing liquids at temperatures greater than 60.degree. C. and at pressures greater than or equal to 40 psig comprising a microporous hollow fiber membrane adapted to withstand collapse and resist appreciable pore shrinkage or pore closure when subjected to temperatures >60.degree. C. and liquid pressures .gtoreq.40 psig for a period of .gtoreq.30 days;
- and a housing enclosing said membrane.
A microporous membrane contactor for degassing liquids at temperatures greater than 60.degree. C. and at pressures greater than or equal to 40 psig comprising:
- a microporous hollow fiber membrane having a wall thickness of greater than 30 micron and made with a polyolefin containing a nucleating agent;
- and
- a housing enclosing said membrane.
A membrane comprising:
- a microporous hollow fiber having a wall thickness greater than 30 microns, being made of a nucleated polyolefin, having a porosity of less than 80%, having a Gurley number greater than 1, and said polyolefin having a melt flow index of greater than 0.1 gram per 10 minutes.
Dependencies are inferred from the claim text.