US3923908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of hydroquinone and/or resorcinol by the cleavage of dihydroperoxides
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1973-10-31
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Granted: 1975-12-02
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Expires: 1993-10-31
Abstract
Abstract Diisopropylbenzene dihydroperoxides are cleaved with an acid catalyst to produce resorcinol and/or hydroquinone by controlling the content of impurities in a cleavage feed solution of the dihydroperoxides to keep the ratio of the number of 2-hydroxy-2propyl groups to the number of molecules of the dihydroperoxides, not more than 0.16. High cleavage yield can be obtained thereby.
Inventors
- 👤 Hideaki Suda
- 👤 Iwao Dohgane
- 👤 Takashi Chinuki
- 👤 Kenji Tanimoto
- 👤 Hirokazu Hosaka
- 👤 Yukimichi Nakao
- 👤 Yuji Ueda
- 👤 Seiya Imada
- 👤 Hideki Yanagihara
- 👤 Kunihiko Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:17
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
IN A PROCESS FOR CLEAVING DIISOPROPYLBENZENE DIHYDROPEROXIDES BY CONTACTING A CLEAVAGE FEED SOLUTION OF THE DIHYDROPEROXIDES REFERRED TO AS DHPO CONTAINING AS IMPURITIES ISOPROPYLPHENYLDIMETHYLCARBINOL REFERRED TO AS MCA, (2-HYDROXY-2-PROPYL) CUMENE HYDROPEROXIDE REFERRED TO AS CHPO AND DI-(2-HYDROXY-2-PROPYL)BENZENE REFERRED TO AS DCA, WITH AN ACID CATALYST TO OBTAIN RESORCINOL AND/OR HYDROQUINONE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE CLEAVAGE REACTION OF THE DIHYDROPEROXIDES BY CONTROLLING THE CONTENT OF THE IMPURITIES IN THE SAID FEED SOLUTION TO KEEP THE RATIO OF THE NUMBER OF 2-HYDROXY-2-PROPYL GROUPS TO THE NUMBER OF MOLECULES OF THE DIHYROPEROXIDES AS EXPRESSED BY THE EQUATION THE RATIO = MOLES OF MCA + MOLES OF CHPO + 2 X MOLES OF DCA/MOLES OF DHPO TO VALUE OF NOT MORE THAN ABOUT 0.16.
Claim 2
Dependent Claim
123 words
IN A PROCESS FOR CLEAVING DIISOPROPYLBENZENE DIHYDROPEROXIDES BY CONTACTING A CLEAVAGE FEED SOLUTION OF THE DIHYDROPEROXIDES REFERRED TO AS DHPO CONTAINING AS IMPURITIES ISOPROPYLPHENYLDIMETHYLCARBINOL REFERRED TO AS MCA, (2-HYDROXY-2-PROPYL) CUMENE HYDROPEROXIDE REFERRED TO AS CHPO AND DI-(2-HYDROXY-2-PROPYL)BENZENE REFERRED TO AS DCA, WITH AN ACID CATALYST TO OBTAIN RESORCINOL AND/OR HYDROQUINONE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE CLEAVAGE REACTION OF THE DIHYDROPEROXIDES BY CONTROLLING THE CONTENT OF THE IMPURITIES IN THE SAID FEED SOLUTION TO KEEP THE RATIO OF THE NUMBER OF 2-HYDROXY-2-PROPYL GROUPS TO THE NUMBER OF MOLECULES OF THE DIHYROPEROXIDES AS EXPRESSED BY THE EQUATION THE RATIO = MOLES OF MCA + MOLES OF CHPO + 2 X MOLES OF DCA/MOLES OF DHPO TO VALUE OF NOT MORE THAN ABOUT 0.16.
Claim 3
Dependent Claim
109 words
In a process for cleaving diisopropylbenzene dihydroperoxides by contacting a cleavage feed solution of the dihydroperoxides referred to as DHPO containing as impurities isopropylphenyldimethylcarbinol referred to as MCA, (2-hydroxy-2-propyl) cumene hydroperoxide referred to as CHPO and di(2-hydroxy-2-propyl)benzene referred to as DCA, with an acid catalyst to obtain resorcinol and/or hydroquinone, the improvement which comprises using a cleavage feed solution of the dihydroperoxides having the ratio of the number 2-hydroxy-2-propyl groups to the number of molecules of the dihydroperoxides as expressed by the equation the ratio moles of MCA + moles of CHPO + 2 X moles of DCA/moles of DHPO to a value of not more than about 0.16.
Claim 4
Dependent Claim
109 words
In a process for cleaving diisopropylbenzene dihydroperoxides by contacting a cleavage feed solution of the dihydroperoxides referred to as DHPO containing as impurities isopropylphenyldimethylcarbinol referred to as MCA, (2-hydroxy-2-propyl) cumene hydroperoxide referred to as CHPO and di(2-hydroxy-2-propyl)benzene referred to as DCA, with an acid catalyst to obtain resorcinol and/or hydroquinone, the improvement which comprises using a cleavage feed solution of the dihydroperoxides having the ratio of the number 2-hydroxy-2-propyl groups to the number of molecules of the dihydroperoxides as expressed by the equation the ratio moles of MCA + moles of CHPO + 2 X moles of DCA/moles of DHPO to a value of not more than about 0.16.
References Cited (Backward Citations)
US2785205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |