Patent US5478961A successfully refreshed from Google Patents.
US5478961A
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Process for preparting aryl carbonates
Assignee: Bayer AG
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Filing: 1994-07-11
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Granted: 1995-12-26
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Expires: 2014-07-11
Abstract
Abstract Carbonates with aromatic ester groups may be prepared by reacting aromatic monohydroxy compounds with phosgene or with chloroformates of aromatic monohydroxy compounds, wherein the process is performed at a temperature in the range 50°-350° C. in the presence of aluminosilicates as heterogeneous catalysts.
Inventors
- 👤 Pieter Ooms
- 👤 Norbert Schon
- 👤 Hans-Josef Buysch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:15
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
A process for preparing aryl carbonates by reacting aromatic monohydroxy compounds with phosgene or chloroformates of aromatic monohydroxy compounds, characterised in that the reaction is performed at a temperature in the range 50°-350° C. under a pressure of 0.2 to 20 bar in the presence of one or more aluminosilicate zeolites as heterogeneous catalysts.
Claim 2
Dependent Claim
54 words
A process for preparing aryl carbonates by reacting aromatic monohydroxy compounds with phosgene or chloroformates of aromatic monohydroxy compounds, characterised in that the reaction is performed at a temperature in the range 50°-350° C. under a pressure of 0.2 to 20 bar in the presence of one or more aluminosilicate zeolites as heterogeneous catalysts.
Claim 3
Dependent Claim
59 words
A process according to claim 1, wherein the aluminosilicate is a zeolite of the formula M.sub.2/n.Al.sub.2 O.sub.3.xSiO.sub.2.yH.sub.2 O in which M represents a metal cation, n represents the valency of the cation, x represents the molar ratio SiO 2 /Al 2 O 3 , wherein x may be a number from 1.0-50.0, and y is a number from 0-9.
Claim 4
Dependent Claim
13 words
The process according to claim 1, wherein the aluminosilicate is an ALPO zeolite.
Claim 5
Dependent Claim
13 words
The process according to claim 1, wherein the aluminosilicate is a SAPO zeolite.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |