Production of aromatic polyimide separating membranes
US4485056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1982 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Jun 3, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An aromatic polyimide separating membrane is produced by a process comprising the steps of: PA0 forming a thin film of a dope solution containing an aromatic polyamic acid dissolved in a polar organic solvent at a temperature of approximately 100.degree. C. or less; PA0 coagulating the thin dope solution film in a coagulating liquid containing at least 60% by volume of at least one member selected from water and lower aliphatic alcohols at a temperature of 60.degree. C. or less; PA0 drying the resultant coagulated aromatic polyamic acid membrane; and PA0 heating the dried aromatic polyamic acid membrane at a temperature of 100.degree. C. to 300.degree. C. to convert it to an aromatic polyimide membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.