Asymmetric modified carbon molecular sieve hollow fiber membranes having improved permeance
First Claim
1. A process for preparing an asymmetric modified carbon molecular sieve hollow fiber membrane having improved gas separation performance properties comprisinga. providing an asymmetric polymer hollow fiber,b. contacting the polymer fiber with a solution comprising a modifying agent,c. contacting the polymer fiber of step b. with a moisture-containing atmosphere to form a treated polymer fiber, andd. pyrolyzing the treated polymer fiber to form an asymmetric modified carbon molecular sieve hollow fiber membrane having an improved gas permeance,wherein the concentration of the modifying agent in the solution is selected to obtain an asymmetric modified carbon molecular sieve hollow fiber membrane having an improved gas permeance.
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Abstract
The present invention provides an asymmetric modified CMS hollow fiber membrane having improved gas separation performance properties and a process for preparing an asymmetric modified CMS hollow fiber membrane having improved gas separation performance properties. The process comprises treating a polymeric precursor fiber with a solution containing a modifying agent prior to pyrolysis. The concentration of the modifying agent in the solution may be selected in order to obtain an asymmetric modified CMS hollow fiber membrane having a desired combination of gas permeance and selectivity properties. The treated precursor fiber is then pyrolyzed to form an asymmetric modified CMS hollow fiber membrane having improved gas permeance.
3 Citations
29 Claims
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1. A process for preparing an asymmetric modified carbon molecular sieve hollow fiber membrane having improved gas separation performance properties comprising
a. providing an asymmetric polymer hollow fiber, b. contacting the polymer fiber with a solution comprising a modifying agent, c. contacting the polymer fiber of step b. with a moisture-containing atmosphere to form a treated polymer fiber, and d. pyrolyzing the treated polymer fiber to form an asymmetric modified carbon molecular sieve hollow fiber membrane having an improved gas permeance, wherein the concentration of the modifying agent in the solution is selected to obtain an asymmetric modified carbon molecular sieve hollow fiber membrane having an improved gas permeance.
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21. A process for forming an asymmetric modified carbon molecular sieve hollow fiber membrane comprising
a. forming an asymmetric hollow polymer fiber, b. contacting the hollow polymer fiber with one or more solvent exchange materials, and c. pyrolyzing the hollow polymer fiber to form an asymmetric carbon molecular sieve hollow fiber membrane, wherein at least one of the solvent exchange materials comprises a modifying agent in an amount effective to improve the gas permeance of the asymmetric carbon molecular sieve hollow fiber membrane.
Specification