Propylene carbonate recovery process

Details Propylene carbonate recovery process Propylene carbonate recovery process

1992-08-04

1994-01-25

Tsang, Cecilia

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549228, 549229, C07D31708

Patent

active

052817237

ABSTRACT:
Disclosed is a method of recovering a cyclic alkylene carbonate, such as propylene carbonate, from an effluent stream of a process in which the cyclic alkylene carbonate removes an organic photoresist material from a substrate. The effluent is a cyclic alkylene carbonate effluent, e.g., a propylene carbonate effluent, of the carbonate, water, and polymeric solids. In the recovery process the cyclic alkylene carbonate effluent is fed to a heat exchanger, and separated into (i) water and volatiles, and (ii) cyclic carbonate. This lowers the concentration of water in the cyclic alkylene carbonate to a level that is low enough to substantially avoid hydrolysis of cyclic alkylene carbonate to the corresponding glycol. The dewatered cyclic alkylene carbonate is evaporated to separate the cyclic alkylene carbonate from high boiling materials and polymeric solids. The dewatered cyclic alkylene carbonate is separated into (i) a cyclic alkylene carbonate fraction, and (ii) a photoresist solids fraction. The photoresist materials fractions contains photoresist material in the alkylene carbonate. The cyclic alkylene carbonate fraction is further separated in a fractionation means into a higher vapor pressure alkylene glycol fraction, and a lower vapor pressure alkylene carbonate fraction.

REFERENCES:
patent: 2766258 (1956-10-01), Malkemus
patent: 2894957 (1959-07-01), Anderson et al.
patent: 3074962 (1963-01-01), Anderson et al.

Affiliated with

Also associated with

Rating

Propylene carbonate recovery process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Propylene carbonate recovery process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Propylene carbonate recovery process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-729013