Claims
- 1. A process for condensing a gaseous mixture of steam, phenol and bisphenol A maintained at a pressure of 30 Torr or less, comprising the steps of:
- introducing said gaseous mixture into a first cooling zone maintained at a pressure of 30 Torr or less and such a temperature that said steam is prevented from condensing while a portion of said phenol is condensed, wherein said gas is brought into counter-current contact with a first liquid cooling medium to condense substantially all of said bisphenol A and part of said phenol and thereby obtain a mixed gas containing uncondensed steam and uncondensed phenol, said first liquid cooling medium being phenol or bisphenol A-containing phenol;
- introducing said mixed gas into a second cooling zone maintained at a pressure of 30 Torr or less and such a temperature that substantially all of said mixed gas is condensed, wherein said gas is brought into counter-current contact with a second liquid cooling medium to condense substantially all of said mixed gas and thereby obtain a condensate-containing liquid, said second liquid cooling medium being an aqueous solution of phenol.
- 2. A process as claimed in claim 1, further comprising recycling a portion of said condensate-containing liquid to said second cooling zone as at least part of said second liquid cooling medium.
- 3. A process as claimed in claim 1, wherein said first cooling zone is maintained at a temperature of 42.degree.-90.degree. C.
Priority Claims (8)
Number |
Date |
Country |
Kind |
3-201444 |
Jul 1991 |
JPX |
|
3-216364 |
Aug 1991 |
JPX |
|
3-219163 |
Aug 1991 |
JPX |
|
3-232354 |
Aug 1991 |
JPX |
|
3-232355 |
Aug 1991 |
JPX |
|
3-232356 |
Aug 1991 |
JPX |
|
3-306522 |
Oct 1991 |
JPX |
|
3-306523 |
Oct 1991 |
JPX |
|
Parent Case Info
This is a division, of application Ser. No. 07/912,487 filed Jul. 13, 1992 U.S. Pat. No. 5,324,867.
US Referenced Citations (8)
Divisions (1)
|
Number |
Date |
Country |
Parent |
912487 |
Jul 1992 |
|