US4092364A
Expired / Lapsed
US
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Caustic hydrolysis of chlorobenzene to diphenyl oxide
Assignee: Dow Chemical Co
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Filing: 1976-06-14
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Granted: 1978-05-30
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Expires: 1996-06-14
Abstract
Abstract The process of preparing diphenyl oxide from caustically hydrolyzing chlorobenzene, wherein phenol is a by-product, is improved by recycling the phenol. The improvement not only maximizes the yield of diphenyl oxide while minimizing the yield of phenol, but it also increases the yield of desirable by-products, such as phenylphenols and biphenylylphenyl ethers.
Inventors
- 👤 William E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
In the noncatalytic process of preparing diphenyl oxide, biphenylylphenyl ethers and phenylphenols from caustically hydrolyzing chlorobenzene at a temperature between about 350° C and about 450° C and at high pressure wherein phenol is a by-product, the caustic and chlorobenzene present at a caustic:chlorobenzene mole ratio between about 0.75:1 and about 3.5:1 the improvement comprising: recycling the phenol such that the phenol and chlorobenzene are present at a phenol:chlorobenzene mole ratio between about 0.1:1 and about 2.5:1 and that a net phenol of zero or less is achieved.
Claim 2
Dependent Claim
88 words
In the noncatalytic process of preparing diphenyl oxide, biphenylylphenyl ethers and phenylphenols from caustically hydrolyzing chlorobenzene at a temperature between about 350° C and about 450° C and at high pressure wherein phenol is a by-product, the caustic and chlorobenzene present at a caustic:chlorobenzene mole ratio between about 0.75:1 and about 3.5:1 the improvement comprising: recycling the phenol such that the phenol and chlorobenzene are present at a phenol:chlorobenzene mole ratio between about 0.1:1 and about 2.5:1 and that a net phenol of zero or less is achieved.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the chlorobenzene is caustically hydrolyzed at a temperature between about 350° C and about 450° C and at a corresponding vapor pressure.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the caustic and chlorobenzene are present at a caustic:chlorobenzene mole ratio between about 1:1 and about 3:1.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein the phenol and chlorobenzene are present at a phenol:chlorobenzene mole ratio between about 0.3:1 and about 2:1.
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) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |