Method of producing vacuum in the production of polymers

Details Method of producing vacuum in the production of polymers Method of producing vacuum in the production of polymers

2008-01-08

2008-01-08

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C417S049000, C417S054000, C417S055000, C528S196000, C528S198000, C528S220000, C528S271000, C528S272000

Reexamination Certificate

active

10554436

ABSTRACT:
A method is disclosed for producing a vacuum and for separating condensable components present in vapor which accumulates during the production of a polymer by melt-phase polycondensation under vacuum. Vapor produced during the production of polymers by melt-phase polycondensation in at least one reaction step under vacuum is drawn of by at least one steam jet vacuum pump with a down stream injection condenser. The steam jet vacuum pump is driven with alkylene carbonate in vapor form and liquid alkylene carbonate is then supplied to the injection condenser as coolant.

REFERENCES:
patent: 4758650 (1988-07-01), Schulz Van Endert

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