skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Anisotropic membranes for gas separation

Abstract

A gas separation membrane has a dense separating layer about 10,000 Angstroms or less thick and a porous support layer 10 to 400 microns thick that is an integral unit with gradually and continuously decreasing pore size from the base of the support layer to the surface of the thin separating layer and is made from a casting solution comprising ethyl cellulose and ethyl cellulose-based blends, typically greater than 47.5 ethoxyl content ethyl cellulose blended with compatible second polymers, such as nitrocellulose. The polymer content of the casting solution is from about 10% to about 35% by weight of the total solution with up to about 50% of this polymer weight a compatible second polymer to the ethyl cellulose in a volatile solvent such as isopropanol, methylacetate, methanol, ethanol, and acetone. Typical nonsolvents for the casting solutions include water and formamide. The casting solution is cast in air from about zero to 10 seconds to allow the volatile solvent to evaporate and then quenched in a coagulation bath, typically water, at a temperature of 7.degree.-25.degree. C. and then air dried at ambient temperature, typically 10.degree.-30.degree. C.

Inventors:
 [1]
  1. Newton, MA
Publication Date:
Research Org.:
A/G Technology Corp
OSTI Identifier:
866312
Patent Number(s):
US 4681605
Assignee:
A/G Technology Corporation (Needham, MA)
DOE Contract Number:  
AC07-83ID12429
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
anisotropic; membranes; gas; separation; membrane; dense; separating; layer; 10; 000; angstroms; thick; porous; support; 400; microns; integral; unit; gradually; continuously; decreasing; pore; size; base; surface; casting; solution; comprising; ethyl; cellulose; cellulose-based; blends; typically; 47; ethoxyl; content; blended; compatible; polymers; nitrocellulose; polymer; 35; weight; total; 50; volatile; solvent; isopropanol; methylacetate; methanol; ethanol; acetone; typical; nonsolvents; solutions; water; formamide; cast; air; zero; allow; evaporate; quenched; coagulation; bath; temperature; degree; -25; dried; ambient; -30; volatile solvent; ambient temperature; pore size; solution comprising; porous support; gas separation; support layer; separation membrane; microns thick; casting solution; air dried; typically water; integral unit; ethyl cellulose; anisotropic membranes; /96/210/264/

Citation Formats

Gollan, Arye Z. Anisotropic membranes for gas separation. United States: N. p., 1987. Web.
Gollan, Arye Z. Anisotropic membranes for gas separation. United States.
Gollan, Arye Z. Thu . "Anisotropic membranes for gas separation". United States. https://www.osti.gov/servlets/purl/866312.
@article{osti_866312,
title = {Anisotropic membranes for gas separation},
author = {Gollan, Arye Z},
abstractNote = {A gas separation membrane has a dense separating layer about 10,000 Angstroms or less thick and a porous support layer 10 to 400 microns thick that is an integral unit with gradually and continuously decreasing pore size from the base of the support layer to the surface of the thin separating layer and is made from a casting solution comprising ethyl cellulose and ethyl cellulose-based blends, typically greater than 47.5 ethoxyl content ethyl cellulose blended with compatible second polymers, such as nitrocellulose. The polymer content of the casting solution is from about 10% to about 35% by weight of the total solution with up to about 50% of this polymer weight a compatible second polymer to the ethyl cellulose in a volatile solvent such as isopropanol, methylacetate, methanol, ethanol, and acetone. Typical nonsolvents for the casting solutions include water and formamide. The casting solution is cast in air from about zero to 10 seconds to allow the volatile solvent to evaporate and then quenched in a coagulation bath, typically water, at a temperature of 7.degree.-25.degree. C. and then air dried at ambient temperature, typically 10.degree.-30.degree. C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

Patent:

Save / Share: