US2002099163A1PendingUtilityA1

Reactive rectification

34
Priority: Aug 23, 2000Filed: Aug 21, 2001Published: Jul 25, 2002
Est. expiryAug 23, 2020(expired)· nominal 20-yr term from priority
Inventors:Gerald JohnEdmund DikowChristine Mendoza-FrohnGeorg RongeRolf BachmannLutz GottschalkMichael Prein
C08G 64/30B01D 3/009Y10T428/24273C08G 64/205C08G 64/307Y02P20/10
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Claims

Abstract

A process for producing polycarbonate is disclosed. Accordingly a pre-reaction mixture containing a bis(hydroxyaryl) compound and a diaryl carbonate is formed and introduced through the top of a reactive rectification column under condition calculated to bring about a reaction. The resulting hydroxyaryl is eliminated and diaryl carbonate in vapor form is introduced at the bottom of the reactive rectification column.

Claims

exact text as granted — not AI-modified
What is claimed:  
     
         1 . A process for producing polycarbonate comprising 
 (i) forming in a pre-reaction unit a mixture containing a bis(hydroxyaryl) compound and a diaryl carbonate,    (ii) introducing said mixture through the top of a reactive rectification column under condition calculated to bring about a reaction of said bis(hydroxyaryl) compound with said diaryl carbonate to yield hydroxyaryl,    (iii) eliminating the hydroxyaryl obtained in (ii) and    (iv) introducing diary carbonate in vapor form at the bottom of said reactive rectification column.    
     
     
         2 . The process of  claim 1  wherein the bis(hydroxyaryl) compound is bisphenol A and the diaryl carbonate is diphenyl carbonate.

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