Patent US5146918A successfully refreshed from Google Patents.
Patent US1679271A successfully refreshed from Google Patents.
Patent US3373891A successfully refreshed from Google Patents.
Patent US3979957A successfully refreshed from Google Patents.
Patent US3972836A successfully refreshed from Google Patents.
US3972836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ortho-alkylated phenols
Assignee: General Electric Co
•
Filing: 1974-12-19
•
Granted: 1976-08-03
•
Expires: 1994-12-19
Abstract
Abstract There are provided alkylation catalysts comprising magnesium oxide mixed with and bonded by manganese oxides. These are used in processes for the vapor phase ortho-alkylation of phenols with an alcohol. The present catalysts are advantageous in that they provide a substantially increased total useful life, a reduced induction period for maximum reaction selectivity, elimination of catalyst losses in comparison with the powders or weakly sintered composites of the prior art and increased selectivity for ortho-substitution. Treatment of the new catalysts with methanol vapor before use enhances their activity in converting phenols to 2,6-xylenol and results in a significant increase in production rate.
Inventors
- 👤 Bernardus J. Van Sorge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:02
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/34
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
25 words
A catalyst comprising a mixture of magnesium oxide with a manganese oxide and having a surface area of at least 20 sq. meters per gram.
Claim 2
Dependent Claim
25 words
A catalyst comprising a mixture of magnesium oxide with a manganese oxide and having a surface area of at least 20 sq. meters per gram.
Claim 3
Dependent Claim
20 words
The catalyst of claim 1 wherein a manganese oxide constitutes from 1 to 15% by weight of the total catalyst.
Claim 4
Dependent Claim
20 words
The catalyst of claim 1 wherein a manganese oxide constitutes from 2 to 10% by weight of the total catalyst.
Claim 5
Dependent Claim
29 words
The catalyst of claim 1 wherein the manganese oxide is substantially free of sulfate ions and is precipitated from an aqueous manganese sulfate solution by contact with an alkali.
Claim 6
Dependent Claim
10 words
The catalyst of claim 1 in the shape of pellets.
Claim 7
Dependent Claim
11 words
The catalyst of claim 1 in the shape of Raschig rings.
Claim 8
Dependent Claim
31 words
The catalyst of claim 1 wherein exposure to methanol vapor has been carried out at a temperature of at least about 250° C. until activation of the catalyst is substantially complete.
Claim 9
Dependent Claim
50 words
A process for the preparation of a catalyst for the ortho-alkylation of phenols comprising blending a mixture of magnesium oxide and a manganese oxide with about an equal amount of water, molding the blend to shape, drying the shaped blend, and heating at the calcination temperature to form the catalyst.
Claim 10
Dependent Claim
50 words
A process for the preparation of a catalyst for the ortho-alkylation of phenols comprising blending a mixture of magnesium oxide and a manganese oxide with about an equal amount of water, molding the blend to shape, drying the shaped blend, and heating at the calcination temperature to form the catalyst.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the calcination temperature is at least 300° F.
Claim 12
Dependent Claim
33 words
The process of claim 8 wherein the manganese oxide in the catalyst is substantially free of sulfate ions and is precipitated from an aqueous solution of manganese sulfate by contact with an alkali.
Claim 13
Dependent Claim
19 words
The process of claim 8 wherein a manganese oxide constitutes from 1 to 15% by weight of the mixture.
Claim 14
Dependent Claim
19 words
The process of claim 11 wherein a manganese oxide constitutes from 2 to 10% by weight of the mixture.
Claim 15
Dependent Claim
23 words
The process of claim 8 wherein the ratio of the mixture of a manganese oxide and magnesium oxide to water is about 1:1.
Claim 16
Dependent Claim
36 words
The process of claim 8 including the step of enhancing the activity of the catalyst by exposure to methanol vapor at a temperature of at least 250° C. until activation of the catalyst is substantially complete.
Claim 17
Dependent Claim
62 words
A catalyst comprising a mixture of magnesium oxide that is bonded with a manganese oxide by blending a mixture of magnesium oxide and a manganese oxide with about an equal amount of water, molding the blend to shape, drying the shaped blend, and heating at the calcination temperature, said catalyst having a surface area of at least 20 sq. meters per gram.
Claim 18
Dependent Claim
62 words
A catalyst comprising a mixture of magnesium oxide that is bonded with a manganese oxide by blending a mixture of magnesium oxide and a manganese oxide with about an equal amount of water, molding the blend to shape, drying the shaped blend, and heating at the calcination temperature, said catalyst having a surface area of at least 20 sq. meters per gram.
Claim 19
Dependent Claim
26 words
A catalyst consisting of a mixture of magnesium oxide with a manganese oxide and having a surface area of at least 20 sq. meters per gram.
Claim 20
Dependent Claim
26 words
A catalyst consisting of a mixture of magnesium oxide with a manganese oxide and having a surface area of at least 20 sq. meters per gram.
References Cited (Backward Citations)
GB717588A
Cited
US3901947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |