Abstract 1. A PROCESS FOR THE PRODUCTION OF A SEMIPERMEABLE POLYBENZIMIDAZOLE MEMBRANE IN THE FORM OF A HOLLOW FILAMENT WHICH IS SUITABLE FOR USE IN REVERSE OSMOSIS APPLICATIONS COMPRISING: (A) PROVIDING A SOLUTION OF ABOUT 5 TO 30 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF THE TOTAL SOLUTION OF POLYBENZIMIDAZOLE POLYMER IN N,N-DIMETHYLACETAMIDE SOLVENT, (B) EXTRUDING SAID SOLUTION THROUGH A CONCENTRIC HOL LOW JET SPINNERET WHILE CONTINUOUSLY INTRODUCING A LIQUID ALKANE HAVING 8 TO 25 CARBON ATOMS INTO THE CENTER PORTION OF SAID EXTRUDED SOLUTION, SAID LIQUID ALKANE BEING IMMISCIBLE WITH SAID EXTRUDED SOLUTION. (C) COAGULATING SAID RESULTING SOLUTION TO FORM A HOLLOW FILAMENT CONTAINING SAID LIQUID ALKANE WITHIN THE CENTER PORTION THEREOF BY CONTACT OF THE EXTRIOR SURFACE THEREOF WITH A NON-SOLVENT FOR SAID POLYBENZIMIDAZOLE POLYMER WHICH IS MISCIBLE WITH N,NDIMETHYLACETAMIDE AND IMMISCIBLE WITH SAID LIQUID ALKANE, (D) WASHING SAID RESULTING HOLLOW FILAMENT WITH A LIQUID WHICH IS MISCIBLE WITH N,N-DIMETHYLACETEAMIDE AND IMMISCIBLE WITH SAID LIQUID ALKANE TO REMOVE RESIDUAL N,N-DIMETHYLACETAMIDE WHILE PRESERVING SAID LIQUID ALKANE WITHIN THE CENTER PORTION THEREOF, AND (E) ANNEALING SAID RESULTING HOLLOW FILAMENT CONTAINING SAID LLIQUID ALKANE WITH IN THE CENTER PORTION THEREOF BY CONTACT OF THE EXTERIOR THEREOF WITH AN ORGANIC LIQUID AT A TEMPERATURE OF ABOUT 120 TO 260*C. WHICH IS A NON-SPOLVENT FOR SAID POLYBENZIMIDAZOLE POLYMER, WITH SAID ORGANIC LIQUID BEING PROVIDED AT ATEMPERATURE BELOW THE BOILING POINT OF SAID LIQUID ALKANE.
Inventors
👤 M Ram
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 21:48
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
230 words
A PROCESS FOR THE PRODUCTION OF A SEMIPERMEABLE POLYBENZIMIDAZOLE MEMBRANE IN THE FORM OF A HOLLOW FILAMENT WHICH IS SUITABLE FOR USE IN REVERSE OSMOSIS APPLICATIONS COMPRISING: (A) PROVIDING A SOLUTION OF ABOUT 5 TO 30 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF THE TOTAL SOLUTION OF POLYBENZIMIDAZOLE POLYMER IN N,N-DIMETHYLACETAMIDE SOLVENT, (B) EXTRUDING SAID SOLUTION THROUGH A CONCENTRIC HOL LOW JET SPINNERET WHILE CONTINUOUSLY INTRODUCING A LIQUID ALKANE HAVING 8 TO 25 CARBON ATOMS INTO THE CENTER PORTION OF SAID EXTRUDED SOLUTION, SAID LIQUID ALKANE BEING IMMISCIBLE WITH SAID EXTRUDED SOLUTION. (C) COAGULATING SAID RESULTING SOLUTION TO FORM A HOLLOW FILAMENT CONTAINING SAID LIQUID ALKANE WITHIN THE CENTER PORTION THEREOF BY CONTACT OF THE EXTRIOR SURFACE THEREOF WITH A NON-SOLVENT FOR SAID POLYBENZIMIDAZOLE POLYMER WHICH IS MISCIBLE WITH N,NDIMETHYLACETAMIDE AND IMMISCIBLE WITH SAID LIQUID ALKANE, (D) WASHING SAID RESULTING HOLLOW FILAMENT WITH A LIQUID WHICH IS MISCIBLE WITH N,N-DIMETHYLACETEAMIDE AND IMMISCIBLE WITH SAID LIQUID ALKANE TO REMOVE RESIDUAL N,N-DIMETHYLACETAMIDE WHILE PRESERVING SAID LIQUID ALKANE WITHIN THE CENTER PORTION THEREOF, AND (E) ANNEALING SAID RESULTING HOLLOW FILAMENT CONTAINING SAID LLIQUID ALKANE WITH IN THE CENTER PORTION THEREOF BY CONTACT OF THE EXTERIOR THEREOF WITH AN ORGANIC LIQUID AT A TEMPERATURE OF ABOUT 120 TO 260*C. WHICH IS A NON-SPOLVENT FOR SAID POLYBENZIMIDAZOLE POLYMER, WITH SAID ORGANIC LIQUID BEING PROVIDED AT ATEMPERATURE BELOW THE BOILING POINT OF SAID LIQUID ALKANE.
Claim 2
Dependent Claim
230 words
A PROCESS FOR THE PRODUCTION OF A SEMIPERMEABLE POLYBENZIMIDAZOLE MEMBRANE IN THE FORM OF A HOLLOW FILAMENT WHICH IS SUITABLE FOR USE IN REVERSE OSMOSIS APPLICATIONS COMPRISING: (A) PROVIDING A SOLUTION OF ABOUT 5 TO 30 PERCENT BY WEIGHT BASED UPON THE WEIGHT OF THE TOTAL SOLUTION OF POLYBENZIMIDAZOLE POLYMER IN N,N-DIMETHYLACETAMIDE SOLVENT, (B) EXTRUDING SAID SOLUTION THROUGH A CONCENTRIC HOL LOW JET SPINNERET WHILE CONTINUOUSLY INTRODUCING A LIQUID ALKANE HAVING 8 TO 25 CARBON ATOMS INTO THE CENTER PORTION OF SAID EXTRUDED SOLUTION, SAID LIQUID ALKANE BEING IMMISCIBLE WITH SAID EXTRUDED SOLUTION. (C) COAGULATING SAID RESULTING SOLUTION TO FORM A HOLLOW FILAMENT CONTAINING SAID LIQUID ALKANE WITHIN THE CENTER PORTION THEREOF BY CONTACT OF THE EXTRIOR SURFACE THEREOF WITH A NON-SOLVENT FOR SAID POLYBENZIMIDAZOLE POLYMER WHICH IS MISCIBLE WITH N,NDIMETHYLACETAMIDE AND IMMISCIBLE WITH SAID LIQUID ALKANE, (D) WASHING SAID RESULTING HOLLOW FILAMENT WITH A LIQUID WHICH IS MISCIBLE WITH N,N-DIMETHYLACETEAMIDE AND IMMISCIBLE WITH SAID LIQUID ALKANE TO REMOVE RESIDUAL N,N-DIMETHYLACETAMIDE WHILE PRESERVING SAID LIQUID ALKANE WITHIN THE CENTER PORTION THEREOF, AND (E) ANNEALING SAID RESULTING HOLLOW FILAMENT CONTAINING SAID LLIQUID ALKANE WITH IN THE CENTER PORTION THEREOF BY CONTACT OF THE EXTERIOR THEREOF WITH AN ORGANIC LIQUID AT A TEMPERATURE OF ABOUT 120 TO 260*C. WHICH IS A NON-SPOLVENT FOR SAID POLYBENZIMIDAZOLE POLYMER, WITH SAID ORGANIC LIQUID BEING PROVIDED AT ATEMPERATURE BELOW THE BOILING POINT OF SAID LIQUID ALKANE.