Filled membranes for separation of polar from non-polar gases
First Claim
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1. The process which comprises passing a mixture of gases across a first side of a gas permeable, filled pore membrane at a pressure higher than that which obtains on the second side of said membrane, said membrane comprising:
- (a) a porous membrane, the pores of which have a size of from about 5 angstroms to about 10 microns, and(b) a substantially non-aqueous composition filling said pores, said composition comprising;
(i) a polar organic solvent of low volatility and having a boiling point of at least about 150°
C., said solvent consisting of at least one member selected from the group consisting of an alkane polyglycol of 2 to 6 carbon atoms and a poly(alkyleneoxy) of an alkane glycol of 2 to 4 carbon atoms having a molecular weight up to 600; and
(ii) at least one gas carrier component selected from the group consisting of alkali metal salts of weak acids having a pK at 25°
C. exceeding 2.0, amines, and (hydroxy lower alkyl)amines, said amines and (hydroxy lower alkyl)amines having low volatility and a boiling point of at least about 150°
C.,whereby gases in said mixture which react with said gas carrier component diffuse preferentially to said second side of said membrane.
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Abstract
Gas permeable, filled pore membranes in which the pores are filled with a substantially non-aqueous mixture of a polyhydroxy solvent and a gas carrier. A typical example is a membrane filled with glycerol and triethanolamine.
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Citations
21 Claims
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1. The process which comprises passing a mixture of gases across a first side of a gas permeable, filled pore membrane at a pressure higher than that which obtains on the second side of said membrane, said membrane comprising:
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(a) a porous membrane, the pores of which have a size of from about 5 angstroms to about 10 microns, and (b) a substantially non-aqueous composition filling said pores, said composition comprising; (i) a polar organic solvent of low volatility and having a boiling point of at least about 150°
C., said solvent consisting of at least one member selected from the group consisting of an alkane polyglycol of 2 to 6 carbon atoms and a poly(alkyleneoxy) of an alkane glycol of 2 to 4 carbon atoms having a molecular weight up to 600; and(ii) at least one gas carrier component selected from the group consisting of alkali metal salts of weak acids having a pK at 25°
C. exceeding 2.0, amines, and (hydroxy lower alkyl)amines, said amines and (hydroxy lower alkyl)amines having low volatility and a boiling point of at least about 150°
C.,whereby gases in said mixture which react with said gas carrier component diffuse preferentially to said second side of said membrane.
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2. A gas permeable, filled pore membrane comprising:
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(a) a porous membrane, the pores of which have a size of from about 5 angstroms to about 10 microns, and (b) a substantially non-aqueous composition filling said pores, said composition comprising; (i) a polar organic solvent of low volatility having a boiling point of from at least about 150°
C., said solvent consisting of at least one member selected from the group consisting of an alkane polyglycol of 2 to 6 carbon atoms and a poly(alkyleneoxy) of an alkane glycol of 2 to 4 carbon atoms and having a molecular weight up to 600; and(ii) at least one gas carrier component selected from the group consisting of alkali metal salts of weak acids having a pK at 25°
C. exceeding 2.0, amines, and (hydroxy lower alkyl)amines, said amines and (hydroxy lower alkyl)amines having low volatility and a boiling point of at least about 150°
C. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification
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Current AssigneeKingston Technology Incorporated (Kingston Technology Corporation)
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Original AssigneeKingston Technology Company Incorporated Delaware (Kingston Technology Corporation)
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InventorsThakore, Yatin B., Stoy, Vladimir
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Primary Examiner(s)SPITZER, ROBERT H
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Application NumberUS07/155,986Time in Patent Office931 DaysField of Search55/16, 55/68, 55/158, 423/228, 423/229US Class Current95/44CPC Class CodesB01D 53/228 characterised by specific m...B01D 61/38 Liquid-membrane separationB01D 69/142 with "carriers"
