Patent US5239105A successfully refreshed from Google Patents.
US5239105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic formation of diarylcarbonates
Assignee: Dow Chemical Co
•
Filing: 1992-01-30
•
Granted: 1993-08-24
•
Expires: 2012-01-30
Abstract
Abstract Diphenylcarbonate is produced by contacting phenol with phosgene or phenylchloroformate or mixture thereof in the presence of one or more heterogeneous catalysts. The catalysts include Group VB metal oxides: silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals: tungsten oxides: and clays. The more preferred catalysts are silicates of yttrium, titanium, or zirconium.
Inventors
- 👤 R. Garth Pews
- 👤 Robert G. Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:32
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
75 words
A process for the production of diarylcarbonates, comprising contacting phenol or substituted phenol with phosgene, an arylchloroformate, or a mixture of arylchloroformate and phosgene in the presence of a heterogeneous catalyst under conditions effective for the formation of a diarylcarbonate, the heterogeneous catalyst being selected from the group consisting of: (a) Group VB metal oxides: (b) silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals; (c) tungsten oxides: and (d) clays.
Claim 2
Dependent Claim
75 words
A process for the production of diarylcarbonates, comprising contacting phenol or substituted phenol with phosgene, an arylchloroformate, or a mixture of arylchloroformate and phosgene in the presence of a heterogeneous catalyst under conditions effective for the formation of a diarylcarbonate, the heterogeneous catalyst being selected from the group consisting of: (a) Group VB metal oxides: (b) silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals; (c) tungsten oxides: and (d) clays.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the heterogeneous catalyst is a silicate of zirconium, yttrium, or titanium.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the heterogeneous catalyst is a silicate of titanium.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 100° C. to about 300° C.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein the temperature is from about 125° C. to about 200° C.
Claim 7
Dependent Claim
44 words
The process of claim 1 wherein the substituted phenol is of the formula: ##STR3## wherein R, R 1 , R 2 , R 3 , and R 4 are separately in each occurrence hydrogen, halo, or alkyl of from 1 to 10 carbon atoms.
Claim 8
Dependent Claim
34 words
The process of claim 6 wherein R, R 1 , R 2 , R 3 , and R 4 are separately in each occurrence hydrogen or alkyl of from one to three carbon atoms.
Claim 9
Dependent Claim
24 words
The process of claim 6 wherein R, R 1 , R 2 , R 3 , and R 4 are hydrogen in each occurrence.
Claim 10
Dependent Claim
43 words
The process of claim 1 wherein the arylchloroformate is of the formula: ##STR4## wherein R, R 1 , R 2 , R 3 , and R 4 are separately in each occurrence hydrogen, halo, or alkyl of from 1 to 10 carbon atoms.
Claim 11
Dependent Claim
34 words
The process of claim 9 wherein R, R 1 , R 2 , R 3 , and R 4 are separately in each occurrence hydrogen or alkyl of from one to three carbon atoms.
Claim 12
Dependent Claim
25 words
The process of claim 9 wherein R, R 1 , R 2 , R 3 , and R 4 are is hydrogen in each occurrence.
Claim 13
Dependent Claim
19 words
The process of claim 1 wherein the pressure is in the range from about atmospheric to about 4000 psig.
Claim 14
Dependent Claim
15 words
The process of claim 1 wherein the process is carried out as a batch reaction.
Claim 15
Dependent Claim
15 words
The process of claim 1 wherein the process is carried out in a continuous manner.
Claim 16
Dependent Claim
47 words
A process for the production of diphenylcarbonate comprising contacting phenol with phenylchloroformate, phosgene, or a mixture of phenylchloroformate and phosgene in the presence of a heterogeneous catalyst under conditions effective for the formation of a diphenylcarbonate, said heterogeneous catalyst being a silicate of yttrium, titanium, or zirconium.
Claim 17
Dependent Claim
47 words
A process for the production of diphenylcarbonate comprising contacting phenol with phenylchloroformate, phosgene, or a mixture of phenylchloroformate and phosgene in the presence of a heterogeneous catalyst under conditions effective for the formation of a diphenylcarbonate, said heterogeneous catalyst being a silicate of yttrium, titanium, or zirconium.
Claim 18
Dependent Claim
17 words
The process of claim 15 wherein the temperature is from about 100° C. to about 300° C.
Claim 19
Dependent Claim
17 words
The process of claim 15 wherein the temperature is from about 125° C. to about 200° C.
Claim 20
Dependent Claim
13 words
The process of claim 15 wherein the catalyst is a silicate of titanium.
Claim 21
Dependent Claim
19 words
The process of claim 15 wherein the pressure is in the range from about atmospheric to about 4000 psig.
Claim 22
Dependent Claim
15 words
The process of claim 15 wherein the process is carried out as a batch reaction.
Claim 23
Dependent Claim
15 words
The process of claim 15 wherein the process is carried out in a continuous manner.
Claim 24
Dependent Claim
30 words
The process of claim 21 wherein flow rate is from 0.01 to 100 bed volume of phenol per hour and temperature is from about 125° C. to about 300° C.
References Cited (Backward Citations)
US2362865A
Cited
US3576838A
Cited
US4182726A
Cited
US4045464A
Cited
US4487962A
Cited
US4410464A
Cited
US4552704A
Cited
US4609501A
Cited
US5034557A
Cited
US4983735A
Cited
US4927931A
Cited
US4996363A
Cited
US5073635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |