US4987260A
Expired / Lapsed
US
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Preparation of anilines
Assignee: Mitsui Chemicals Inc
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Filing: 1988-12-13
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Granted: 1991-01-22
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Expires: 2008-12-13
Abstract
Abstract An aniline is prepared by reacting a phenol with an amination agent in the presence of a gamma -alumina catalyst having a specific porosity.
Inventors
- 👤 Mitsuki Yasuhara
- 👤 Fujihisa Matsunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:07
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/04; C07C209/14; C07C209/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A process for preparing an niline, comprising reacting a phenol with an amination agent in the presence of a gamma-alumina catalyst wherein said gamma-alumina catalyst is, without pretreatment, a low alkali alumina consisting essentially of at least 90% by weight of alumina, less than 10% by weight of silica, and up to 0.5% by weight of an alkali metal oxide in the dry state, said catalyst has, without pretreatment, a mean pore diameter in the range of from 30 to 90 angstroms with a standard deviation of 10 to 40 angstroms based on statistical calculation from the pore diameter and pore volume, and said gamma-alumina catalyst is, without pretreatment, a weakly acidic alumina having a pKa value in the range of from +3.3 to +6.8 as measured with Hammett's indicator and an integrated acid quantity of up to 0.5 meq/gram on the dry basis.
Claim 2
Dependent Claim
144 words
A process for preparing an niline, comprising reacting a phenol with an amination agent in the presence of a gamma-alumina catalyst wherein said gamma-alumina catalyst is, without pretreatment, a low alkali alumina consisting essentially of at least 90% by weight of alumina, less than 10% by weight of silica, and up to 0.5% by weight of an alkali metal oxide in the dry state, said catalyst has, without pretreatment, a mean pore diameter in the range of from 30 to 90 angstroms with a standard deviation of 10 to 40 angstroms based on statistical calculation from the pore diameter and pore volume, and said gamma-alumina catalyst is, without pretreatment, a weakly acidic alumina having a pKa value in the range of from +3.3 to +6.8 as measured with Hammett's indicator and an integrated acid quantity of up to 0.5 meq/gram on the dry basis.
Claim 3
Dependent Claim
30 words
The process as set forth in claim 1 wherein said γ-alumina catalyst contains ink bottle-shaped pores in a total pore volume of at least 0.4 c.c./gram on the dry basis.
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) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |