US4410464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaryl carbonate process
Assignee: General Electric Co
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Filing: 1982-03-15
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Granted: 1983-10-18
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Expires: 2002-03-15
Abstract
Abstract Diphenyl carbonates are prepared by the reaction of phenol and a dialkyl carbonate in the presence of an effective amount of a suitable catalyst and a molecular sieve. The alkyl aryl carbonate produced in the first step of the reaction can be converted to the diaryl carbonate by further reaction with phenol, in the absence of molecular sieves.
Inventors
- 👤 John E. Hallgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:55
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A process for the production of diaryl carbonates comprising: A. producing an aryl alkyl carbonate by reacting a dialkyl carbonate with a phenol in accordance with the equation: ##STR3## wherein R is selected from the class consisting of halogen, alkyl, alkoxy, aryl and aryloxy groups; n is a whole number from 0 to 3; and R' is methyl or ethyl, in the presence of an effective amount of a catalyst comprising a salt or alkoxide of Al +3 , Zn +2 , Ti +4 , Sn +4 or Zr +4 and a methanol- or ethanol-removing amount of a crystalline hydrated silica-alumina molecular sieve having a pore size from 4 Å to 5 Å, said methanol- or ethanol-removing amount being about 8 to 20 parts per part of methanol or ethanol liberated, and B. reacting said aryl alkyl carbonate with an additional amount of said phenol at an elevated temperature in the presence of a catalyst, to produce the diaryl carbonate in accordance with the equation: ##STR4##
Claim 2
Dependent Claim
166 words
A process for the production of diaryl carbonates comprising: A. producing an aryl alkyl carbonate by reacting a dialkyl carbonate with a phenol in accordance with the equation: ##STR3## wherein R is selected from the class consisting of halogen, alkyl, alkoxy, aryl and aryloxy groups; n is a whole number from 0 to 3; and R' is methyl or ethyl, in the presence of an effective amount of a catalyst comprising a salt or alkoxide of Al +3 , Zn +2 , Ti +4 , Sn +4 or Zr +4 and a methanol- or ethanol-removing amount of a crystalline hydrated silica-alumina molecular sieve having a pore size from 4 Å to 5 Å, said methanol- or ethanol-removing amount being about 8 to 20 parts per part of methanol or ethanol liberated, and B. reacting said aryl alkyl carbonate with an additional amount of said phenol at an elevated temperature in the presence of a catalyst, to produce the diaryl carbonate in accordance with the equation: ##STR4##
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein R' is methyl and n is 0.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein the reaction between the dialkyl carbonate and the phenol is carried out at from room temperature to 200° C.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein the pressure employed in the reaction between the diaryl carbonate and phenol is from atmospheric to 300 psig.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the catalyst employed is a titanate ester.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the catalyst employed is a tin catalyst.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the catalyst employed is a mixture of a titanate ester and a tin catalyst.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |