US4013694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceria catalyzea conversion of phenols to dibenzofurans
Assignee: Monsanto Co
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Filing: 1975-08-08
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Granted: 1977-03-22
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Expires: 1995-08-08
Abstract
Abstract A method for preparation of heterocyclic fused ring compounds by dehydration and dehydrogenation of certain phenolic compounds in the presence of a cerium oxide catalyst is disclosed. Preferred phenolic compounds, catalytic materials, and reaction conditions also are described.
Inventors
- 👤 Norman A. Fishel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:05
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/91; B; B01; B01J; B01J23/00; B01J23/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
Process for the production of a dibenzofuran compound which comprises contacting a phenolic compound feedstock comprising a phenol having an unsubstituted ortho position selected from phenols and polycyclic phenols having no substituents other than alkyl, hydroxy, aryl, aralkyl and alkaryl in the vapor phase at a temperature of 300° to 700° C at a gas hourly space velocity of from 1 hr - 1 to 2,000 hr - 1 with a catalyst essentially composed of a member of the class of ceria and combinations of ceria with an oxide of a metal of the group consisting of aluminum, silicon, magnesium, titanium, zirconium, hafnium, calcium, potassium, sodium, lanthanum, neodymium, praseodymium, samarium, thorium, and uranium and mixtures thereof
Claim 2
Dependent Claim
116 words
Process for the production of a dibenzofuran compound which comprises contacting a phenolic compound feedstock comprising a phenol having an unsubstituted ortho position selected from phenols and polycyclic phenols having no substituents other than alkyl, hydroxy, aryl, aralkyl and alkaryl in the vapor phase at a temperature of 300° to 700° C at a gas hourly space velocity of from 1 hr - 1 to 2,000 hr - 1 with a catalyst essentially composed of a member of the class of ceria and combinations of ceria with an oxide of a metal of the group consisting of aluminum, silicon, magnesium, titanium, zirconium, hafnium, calcium, potassium, sodium, lanthanum, neodymium, praseodymium, samarium, thorium, and uranium and mixtures thereof
Claim 3
Dependent Claim
86 words
Process for the production of dibenzofuran which comprises contacting phenol in the vapor phase at a temperature of 300° to 700° C at a gas hourly space velocity of from 1 hr - 1 to 2,000 hr - 1 over a catalyst essentially composed of a member of the class of ceria and combinations of ceria with an oxide of a metal of the group consisting of aluminum, silicon, magnesium, titanium, zirconium, hafnium, calcium, potassium, sodium, lanthanum, neodymium, praseodymium, somarium, thorium, and uranium and mixtures thereof.
Claim 4
Dependent Claim
86 words
Process for the production of dibenzofuran which comprises contacting phenol in the vapor phase at a temperature of 300° to 700° C at a gas hourly space velocity of from 1 hr - 1 to 2,000 hr - 1 over a catalyst essentially composed of a member of the class of ceria and combinations of ceria with an oxide of a metal of the group consisting of aluminum, silicon, magnesium, titanium, zirconium, hafnium, calcium, potassium, sodium, lanthanum, neodymium, praseodymium, somarium, thorium, and uranium and mixtures thereof.
Claim 5
Dependent Claim
11 words
Process as in claim 2 in which the catalyst is ceria.
Claim 6
Dependent Claim
15 words
Process as in claim 3 in which the ceria is dispersed on an alumina carrier.
Claim 7
Dependent Claim
15 words
Process as in claim 3 in which the ceria is dispersed on a silica-alumina carrier.
Claim 8
Dependent Claim
15 words
Process as in claim 3 in which the ceria is in combination with potassium oxide.
Claim 9
Dependent Claim
15 words
Process as in claim 3 in which the ceria is in combination with thorium oxide.
Claim 10
Dependent Claim
20 words
Process as in claim 1 in which the feedstock is orthophenylphenol, and the product is a diphenyl derivative of dibenzofuran.
Claim 11
Dependent Claim
18 words
Process as in claim 1 in which the feedstock is resorcinol, and the products are 1,7-dihydroxydibenzofuran and 3,7-dihydoxydibenzofuran.
Claim 12
Dependent Claim
16 words
Process as in claim 1 in which the feedstock is 1-naphtol, and the product is dinaphthofuran.
Claim 13
Dependent Claim
16 words
Process as in claim 1 in which the feedstock is paracresol, and the product is 2,8-dimethyldibenzofuran.
Claim 14
Dependent Claim
15 words
Process as in claim 1 in which hydrogen is added to the reaction is mixture.
Claim 15
Dependent Claim
30 words
Process as in claim 1 in which the catalyst is periodically regenerated by passing an oxygen containing gas over the catalyst at a temperature of from 300° to 1000° C.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |