US3849512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoprene prepared by the catalytic dehydration of 2-methyl-2,3-butanediol
Assignee: Texas Petrochemicals Corp
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Filing: 1970-12-10
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Granted: 1974-11-19
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Expires: 1990-12-10
Abstract
Abstract 1. A PROCESS FOR THE DEHYDRATION OF 2-METHYL-2,3BUTANEDIOL CONSISTING ESSENTIALLY OF CONTACTING 2-METHYL2,3-BUTANEDIOL IN THE VAPOR PHASE WITH A CATALYST AT A TEMPERATURE IN THE RANGE OF 200 TO 500* C., SAID CATALYST BEING THORIUM OXIDE AND LITHIUM PHOSPHATE IN WHICH THE LITHIUM PHOSPHATE HAS A SUBSTANTIALLY NEUTRAL PH AND WHEREIN THE THORIUM OXIDE AND LITHIUM PHOSPHATE ARE MAINTAINED SEPARATE AND DISTINCT FROM EACH OTHER, IN DISCRETE BEDS, SAID 2-METHYL-2,3-BUTANEDIOL CONTACTING SAID THORIUM OXIDE BED FIRST AND THEN SUBSEQUENTLY CONTACTING SAID LITHIUM PHOSPHATE.
Inventors
- 👤 W Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:17
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/12; B01J27/00; B01J27/14; B01J27/16; B01J27/18; C; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2521/12; C07C2521/18; C07C2523/00; C07C2523/12; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR THE DEHYDRATION OF 2-METHYL-2,3BUTANEDIOL CONSISTING ESSENTIALLY OF CONTACTING 2-METHYL2,3-BUTANEDIOL IN THE VAPOR PHASE WITH A CATALYST AT A TEMPERATURE IN THE RANGE OF 200 TO 500* C., SAID CATALYST BEING THORIUM OXIDE AND LITHIUM PHOSPHATE IN WHICH THE LITHIUM PHOSPHATE HAS A SUBSTANTIALLY NEUTRAL PH AND WHEREIN THE THORIUM OXIDE AND LITHIUM PHOSPHATE ARE MAINTAINED SEPARATE AND DISTINCT FROM EACH OTHER, IN DISCRETE BEDS, SAID 2-METHYL-2,3-BUTANEDIOL CONTACTING SAID THORIUM OXIDE BED FIRST AND THEN SUBSEQUENTLY CONTACTING SAID LITHIUM PHOSPHATE.
Claim 2
Dependent Claim
82 words
A PROCESS FOR THE DEHYDRATION OF 2-METHYL-2,3BUTANEDIOL CONSISTING ESSENTIALLY OF CONTACTING 2-METHYL2,3-BUTANEDIOL IN THE VAPOR PHASE WITH A CATALYST AT A TEMPERATURE IN THE RANGE OF 200 TO 500* C., SAID CATALYST BEING THORIUM OXIDE AND LITHIUM PHOSPHATE IN WHICH THE LITHIUM PHOSPHATE HAS A SUBSTANTIALLY NEUTRAL PH AND WHEREIN THE THORIUM OXIDE AND LITHIUM PHOSPHATE ARE MAINTAINED SEPARATE AND DISTINCT FROM EACH OTHER, IN DISCRETE BEDS, SAID 2-METHYL-2,3-BUTANEDIOL CONTACTING SAID THORIUM OXIDE BED FIRST AND THEN SUBSEQUENTLY CONTACTING SAID LITHIUM PHOSPHATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |