Patent US3880933A successfully refreshed from Google Patents.
US3880933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of carbon disulfide to methyl mercaptan in presence of hydrogen sulfide
Assignee: Phillips Petroleum Co
•
Filing: 1973-05-02
•
Granted: 1975-04-29
•
Expires: 1993-05-02
Abstract
Abstract The conversion of carbon disulfide by hydrogenation in presence of a sulfactive hydrogenation catalyst to methyl mercaptan is conducted in presence of hydrogen sulfide added in an amount effective to permit an increase in space velocity such that increased conversion of carbon disulfide to methyl mercaptan at the expense of dimethyl sulfide is obtained. Dimethyl sulfide, also produced, is reduced, higher space velocities are attained over a broad range with increase in conversion of CS2, the H2S moderating the reaction or modifying same to yield the obtained results. Generally, very considerable increase in mol ratio of CH3SH/(CH3)2S is obtained.
Inventors
- 👤 Donald H Kubicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:07
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/02; C07C319/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
A PROCESS FOR THE CONVERSION OF CARBON DISULFIDE TO METHYL MERCAPTAN AND UNAVOIDABLY TO DIMETHYL SULFIDE WHICH COMPRISES HYDROGENATING CARBON DISULFIDE IN THE PRESENCE OF HYDROGEN AND A SULFACTIVE HYDROGENATION CATALYST AND HYDROGEN SULFIDE ADDED IN AN AMOUNT WITH RESPECT TO THE CARBON DISULFIDE EFFECTIVE TO PERMIT SUBSTANTIALLY OVER A BOARD RANGE AN INCREASE IN SPACE VELOCITY WITH CONCOMITANT INCREASE IN CONVERSION OF CARBON DISULFIDE TO METHYL MERCAPTAN AT THE EXPENSE OF DIMETHYL SULFIDE WHEREIN THE MOL RATIO O H2S TO CS2 IS IN THE APPROXIMATE RANGE OF FROM ABOUT 0.5/1 TO ABOUT 20/1, THE MOL RATIO OF HYDROGEN TO CARBON DISULFIDE IS IN THE APPROXIMATE RANGE OF FROM ABOUT 0.1/1 TO ABOUT 10/1, THE PRESSURE IS IN THE APPROXIMATE RANGE FROM ABOUT ATMOSPHERIC TO ABOUT 1,000 PSIG, THE TEMPERATURE IS IN THE APPROXIMATE RANGE OF FROM ABOUT 300* TO ABOUT 650*F, AND THE SPACE VELOCITY IS IN THE APPROXIMATE RANGE OF FROM ABOUT 100 TO ABOUT 5,000 EXPRESSED AS GASEOUS VOLUMES OF REACTANTS PER VOLUME OF CATALYST PER HOUR.
Claim 2
Dependent Claim
170 words
A PROCESS FOR THE CONVERSION OF CARBON DISULFIDE TO METHYL MERCAPTAN AND UNAVOIDABLY TO DIMETHYL SULFIDE WHICH COMPRISES HYDROGENATING CARBON DISULFIDE IN THE PRESENCE OF HYDROGEN AND A SULFACTIVE HYDROGENATION CATALYST AND HYDROGEN SULFIDE ADDED IN AN AMOUNT WITH RESPECT TO THE CARBON DISULFIDE EFFECTIVE TO PERMIT SUBSTANTIALLY OVER A BOARD RANGE AN INCREASE IN SPACE VELOCITY WITH CONCOMITANT INCREASE IN CONVERSION OF CARBON DISULFIDE TO METHYL MERCAPTAN AT THE EXPENSE OF DIMETHYL SULFIDE WHEREIN THE MOL RATIO O H2S TO CS2 IS IN THE APPROXIMATE RANGE OF FROM ABOUT 0.5/1 TO ABOUT 20/1, THE MOL RATIO OF HYDROGEN TO CARBON DISULFIDE IS IN THE APPROXIMATE RANGE OF FROM ABOUT 0.1/1 TO ABOUT 10/1, THE PRESSURE IS IN THE APPROXIMATE RANGE FROM ABOUT ATMOSPHERIC TO ABOUT 1,000 PSIG, THE TEMPERATURE IS IN THE APPROXIMATE RANGE OF FROM ABOUT 300* TO ABOUT 650*F, AND THE SPACE VELOCITY IS IN THE APPROXIMATE RANGE OF FROM ABOUT 100 TO ABOUT 5,000 EXPRESSED AS GASEOUS VOLUMES OF REACTANTS PER VOLUME OF CATALYST PER HOUR.
Claim 3
Dependent Claim
40 words
A process according to claim 1 wherein the catalyst is a sulfactive hydrogenation catalyst having approximately the following composition: CoO, 3-4 percent by weight; MoO3, 15-16 percent; Na2O, 0.4 percent; Fe, 0.05 percent; and the remainder consisting essentially of alumina.
Claim 4
Dependent Claim
44 words
A process according to claim 1 wherein the mol rAtio of H2S to CS2 is from about 1.5/1 to about 10/1 and the space velocity is in the range of from 500 to 2,200 gaseous volumes of reactants per volume of catalyst per hour.
References Cited (Backward Citations)
US3488739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |