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A composition for making polymeric fiber membranes, for use in non-cryogenic separation of gases, substantially improves product flow, with only a small decrease in the recovery ratio. The composition is a spin dope including tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyp

A composition for making polymeric fiber membranes, for use in non-cryogenic separation of gases, substantially improves product flow, with only a small decrease in the recovery ratio. The composition is a spin dope including tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyphenylfluorene polycarbonate (TBBHPF-PC), in proportions, by weight, ranging (in percent) from about 60/40 to 40/60, and n-methyl pyrrolidinone (NMP) and triethylene glycol (TEG), wherein the ratio of the amounts of NMP to TEG, by weight, is in the range of about 1.6-2.5. The spin dope is used to make hollow fibers for use in gas-separation membrane modules.

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1. A composition for use in making polymeric fiber membranes, the composition comprising a spin dope including: a) a mixture of tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyphenylfluorene polycarbonate (TBBHPF-PC), in proportions, by weight, ranging (in percent) from abou

1. A composition for use in making polymeric fiber membranes, the composition comprising a spin dope including: a) a mixture of tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyphenylfluorene polycarbonate (TBBHPF-PC), in proportions, by weight, ranging (in percent) from about 60/40 to 40/60, andb) n-methyl pyrrolidinone (NMP) and triethylene glycol (TEG), wherein a ratio of NMP to TEG, by weight, is in a range of about 1.6-2.5. 2. The composition of claim 1, wherein the TBBA-PC and TBBHPF-PC are provided in substantially equal amounts, by weight. 3. The composition of claim 1, wherein the ratio of NMP to TEG is about 2. 4. The composition of claim 2, wherein the ratio of NMP to TEG is about 2. 5. The composition of claim 1, wherein the spin dope comprises, by weight, 22.5% TBBA-PC, 22.5% TBBHPF-PC, 18.6% TEG, and 36.4% NMP. 6. A method of making polymeric fiber membranes for use in non-cryogenic gas separation, the method comprising the steps of: a) combining tetrabromo bis-phenol A polycarbonate (TBBA-PC) and tetrabromo bishydroxyphenylfluorene polycarbonate (TBBHPF-PC), in proportions, by weight, ranging (in percent) from about 60/40 to 40/60, to form a mixture,b) adding the mixture of step (a) to a mixture of n-methyl pyrrolidinone (NMP) and triethylene glycol (TEG), wherein a ratio of NMP to TEG, by weight, is in a range of about 1.6-2.5, so as to form a spin dope, andc) forming the spin dope into hollow fibers. 7. The method of claim 6, further comprising passing gas through said fibers so as to separate the gas into components. 8. The method of claim 6, further comprising providing the TBBA-PC and TBBHPF-PC in substantially equal amounts, by weight. 9. The method of claim 6, further comprising providing the NMP and TEG in a ratio which is about 2. 10. The method of claim 8, further comprising providing the NMP and TEG in a ratio which is about 2. 11. The method of claim 6, further comprising coating the fibers with an aqueous solution of a non-ionic surfactant. 12. The method of claim 11, further comprising selecting the non-ionic surfactant to be in a concentration of about 5-150 ppm. 13. The method of claim 6, wherein step (c) is performed at a temperature in a range of about 50-85° C. 14. The method of claim 11, wherein step (c) is performed at a temperature in a range of about 50-85° C.