US4549031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of carbohydrates
Assignee: Mobil Oil AS
•
Filing: 1984-11-08
•
Granted: 1985-10-22
•
Expires: 2004-11-08
Abstract
Abstract A process for the direct conversion of an aqueous solution of carbohydrates to hydrocarbons where a feed consisting essentially of an aqueous solution of carbohydrates is passed over a crystalline aluminosilicate zeolite catalyst having a constraint index of 1 to 12 and a silica/alumina molar ratio of about 12. An important feature of this invention is the short amount of time the aqueous carbohydrate solution is in contact with the catalyst.
Inventors
- 👤 Nai Y. Chen
- 👤 Leonard R. Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:01
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
110 words
A process for the conversion of an aqueous solution of carbohydrates to hydrocarbons which comprises contacting a feed stream consisting essentially of an aqueous solution of carbohydrate with a crystalline zeolite catalyst in a cyclic fluid bed operation involving cracking and regeneration at a temperature of 300° C. to 650° C. and space velocity (WHSV) of 0.5 to 5 for a period of time not exceeding 10 minutes, and thereafter recovering a hydrocarbon product of increased carbon content; said catalyst being characterized as having a constraint index of about 1 to 12 and a dried crystal density in the hydrogen form not substantially less than 1.6 grams per cubic centimeter.
Claim 2
Dependent Claim
110 words
A process for the conversion of an aqueous solution of carbohydrates to hydrocarbons which comprises contacting a feed stream consisting essentially of an aqueous solution of carbohydrate with a crystalline zeolite catalyst in a cyclic fluid bed operation involving cracking and regeneration at a temperature of 300° C. to 650° C. and space velocity (WHSV) of 0.5 to 5 for a period of time not exceeding 10 minutes, and thereafter recovering a hydrocarbon product of increased carbon content; said catalyst being characterized as having a constraint index of about 1 to 12 and a dried crystal density in the hydrogen form not substantially less than 1.6 grams per cubic centimeter.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the zeolite catalyst has an α-activity of 30 to 1000.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the zeolite catalyst has an α-activity of 100 to 150.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the space velocity (WHSV) is from 0.5 to 2.5.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the temperature is from 400° C. to 550° C.
Claim 7
Dependent Claim
23 words
The process of claim 1 wherein the aqueous solution of carbohydrates is contacted for a period of time of 1 to 5 minutes.
Claim 8
Dependent Claim
28 words
The process of claim 1 wherein the aqueous solution of carbohydrates is passed over the zeolite catalyst for a period of time from 2 seconds to 1 minute.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the zeolite catalyst is ZSM-5.
Claim 10
Dependent Claim
16 words
The process of claim 1 wherein the carbohydrate solution is the hydrolysis product of a polysaccharide.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein the polysaccharide is starch or cellulose.
Claim 12
Dependent Claim
13 words
The process of claim 8 wherein the catalyst is dispersed in a matrix.
References Cited (Backward Citations)
US3998898A
Cited
US4046825A
Cited
US3936353A
Cited
US3979472A
Cited
US4148835A
Cited
US4300009A
Cited
US4313011A
Cited
US4503278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |