US4273623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of resorcin
Assignee: Mitsui Chemicals Inc
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Filing: 1979-05-22
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Granted: 1981-06-16
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Expires: 1999-05-22
Abstract
Abstract In the process for obtaining a concentrate of resorcin by acid-decomposing m-diisopropylbenzene hydroperoxide in an inert solvent in the presence of an acidic solid catalyst and distilling off acetone and the inert solvent from the resulting acid-decomposition reaction mixture, if water is added to this reaction mixture in an amount of 20 to 70% by weight based on resorcin and the reaction mixture is then subjected to distillation, resorcin can be obtained at a high recovery yield.
Inventors
- 👤 Isao Hashimoto
- 👤 Toru Taguchi
- 👤 Hirohiko Nambu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:18
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/08; C07C37/68; C07C37/70; C07C37/74
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
In the process for the preparation of resorcin, by the steps of acid-decomposing m-diisopropylbenzene dihydroperoxide in an inert solvent in the presence of an acid catalyst, separating the catalyst from the acid-decomposition reaction mixture and subjecting the reaction mixture to distillation to separate a resorcin-containing concentrate from acetone formed as a by-product and the inert solvent, the improvement comprising carrying out the acid-decomposition of the dihydroperoxide in the presence of an acidic solid catalyst in an amount of 50 to 200% by weight based on the dihydroperoxide, adding water to the acid decomposition reaction mixture in an amount of 20 to 70% by weight based on resorcin contained in the reaction mixture prior to the distillation and subjecting the resulting mixture to said distillation.
Claim 2
Dependent Claim
124 words
In the process for the preparation of resorcin, by the steps of acid-decomposing m-diisopropylbenzene dihydroperoxide in an inert solvent in the presence of an acid catalyst, separating the catalyst from the acid-decomposition reaction mixture and subjecting the reaction mixture to distillation to separate a resorcin-containing concentrate from acetone formed as a by-product and the inert solvent, the improvement comprising carrying out the acid-decomposition of the dihydroperoxide in the presence of an acidic solid catalyst in an amount of 50 to 200% by weight based on the dihydroperoxide, adding water to the acid decomposition reaction mixture in an amount of 20 to 70% by weight based on resorcin contained in the reaction mixture prior to the distillation and subjecting the resulting mixture to said distillation.
Claim 3
Dependent Claim
39 words
A process for the preparation of resorcin according to claim 1 wherein the acid-decomposition reaction mixture to which water has been added is subjected to distillation at a temperature of 70° to 140° C. under atmospheric or reduced pressure.
Claim 4
Dependent Claim
54 words
A process for the preparation of resorcin according to claim 1 wherein said acid-decomposition reaction mixture containing at least one member selected from the group consisting of carbinols, olefins and peroxide formed as by-products by said acid-decomposition in an amount of at least 0.1 mole per mole of resorcin contained in said reaction mixture.
Claim 5
Dependent Claim
37 words
A process for the preparation of resorcin according to claim 1 wherein water is added to said acid-decomposition reaction mixture in an amount of 30 to 50% by weight based on resorcin contained in said reaction mixture.
Claim 6
Dependent Claim
74 words
A process for the preparation of resorcin according to claim 1 wherein said acid-decomposition reaction mixture is a mixture comprising 0.7 to 1.5 mol/l of resorcin, 6 to 15 mol/l of acetone, 0.5 to 2.5 mol/l of an aromatic hydrocarbon solvent and 0.1 to 0.5 mol/l of at least one member selected from the group consisting of carbinols, olefins and peroxides, which have been formed as by-products by said acid-decomposition reaction of m-diisopropylbenzene dihydroperoxide.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |