Title:
PROCESS FOR RECOVERING CRYSTALS FROM SLURRY
Document Type and Number:
WIPO Patent Application WO/1989/011323
Kind Code:
A1
Abstract:
The invention relates to a process for efficiently recovering crystals from slurry for a long time by feeding a slurry to a rotary vacuum filter, filtering with suction while rotating a cylindrical filtering member, washing and again filtering with suction, which comprises applying pressure to the slurry side so as to keep the temperature and pressure at levels not making the filtrate from the rotary vacuum filter supersaturated. This process enables prevention of clogging of the filtering member due to precipitation of crystals from the mother liquor side or due to an increase in viscosity, and efficient recovery of crystals from the slurry for a long period of time. This process is adapted for recovery of crystals of crude or purified terephthalic acid, and is also applicable to recovery of crystals in general, such as hydroquinone or resorcinol, from slurry.
Inventors:
UEDA MASANORI (JP)
Application Number:
PCT/JP1989/000529
Publication Date:
November 30, 1989
Filing Date:
May 26, 1989
Export Citation:
Assignee:
MITSUI PETROCHEMICAL IND (JP)
International Classes:
B01D9/02; B01D33/06; B01D24/46; B01D33/073; B01D33/09; B01D33/44; B01D33/58; B01D37/00; C07B63/00; C07C51/43; C07C63/26; (IPC1-7): B01D33/06
Foreign References:
| JPH04825967A | ||||
| JPH04826740A | ||||
| JPS49135939A | 1974-12-27 |
Other References:
See also references of EP 0406424A4
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