US3621071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dehydrogenating and cracking alkanes and olefins
Assignee: Dow Chemical Co
•
Filing: 1968-03-21
•
Granted: 1971-11-16
•
Expires: 1988-03-21
Abstract
Abstract Aliphatic hydrocarbons are dehydrogenated and/or cracked using catalysts prepared by precipitating nickel with a phosphate ion or coprecipitating chromium and nickel with phosphate ions, the latter coprecipitation being carried out to produce a material having from six to 12 atoms of chromium per atom of nickel on one hand or six to 12 atoms of nickel per atom of chromium on the other hand. The catalyst is precipated in the gel form in the presence of ammonium hydroxide.
Inventors
- 👤 Charles R Noddings
- 👤 Andrew J Dietzler
- 👤 Ronald G Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:25
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/188; B01J27/19; C07C4/00; C07C4/02; C07C4/06; C07C4/08; C07C4/10; C07C5/321; C07C5/35; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
The method of claim 1 which comprises passing hydrocarbon vapors containing a paraffin having four carbon atoms and between 10 and 20 volumes per volume of hydrocarbon of steam into contact with the catalyst.
Claim 2
Dependent Claim
133 words
A process for dehydrogenating propylene to ethylene, propyne and propadiene which comprises passing gaseous propylene at a temperature of about 700* to 1,000* C. over a chromium-nickel-containing coprecipitated phosphate catalyst and in the presence of steam, said propylene being employed in proportions to provide space velocities of from about 100 to 500 volumes of propylene per volume of catalyst per hour at standard temperature and pressure and from about 10 to about 30 volumes of steam per volume of propylene feed, said catalyst containing from about 6 to 9 moles of chromium per mole of nickel or 6 to 9 moles of nickel per mole of chromium, and coprecipitation in the gel form at a pH of between about 4 to 9 established at least in part by the presence of ammonium hydroxide.
Claim 3
Dependent Claim
24 words
The process of claim 3 wherein said catalyst is a phosphate containing from about 6 to 9 moles of chromium per mole of nickel.
Claim 4
Dependent Claim
28 words
The process of claim 4, wherein said temperature is from about 805* C. to about 875* C. and said chromium to nickel ratio is 6 to 1 respectively.
Claim 5
Dependent Claim
22 words
The process of claim 3 wherein said catalyst is a phosphate containing 6 to 9 moles of nickel per mole of chromium.
Claim 6
Dependent Claim
27 words
In the process of claim 6, 815*said temperature is from about 755* to about 815* C. and said nickel to chromium ratio is 9 to 1 respectively.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |