US3708550A
Expired / Lapsed
US
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Dehydrogenation process
Assignee: Ameripol Inc
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Filing: 1971-06-16
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Granted: 1973-01-02
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Expires: 1991-06-16
Abstract
Abstract Process for reducing the formation and effects of carbon mounds in dehydrogenation reactions employing calcium nickel phosphatecontaining catalysts by adding vaporized sulfur-containing materials to the catalyst bed. Such additives preferably are added during the hydrocarbon feed phase of the reaction cycle.
Inventors
- 👤 H Beuther
- 👤 H Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:58
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; B; B01; B01J; B01J27/00; B01J27/14; B01J27/185; B01J27/1853; C07C5/42; C07C5/48; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
In a process for the catalytic dehydrogenation of an olefin to a diolefin by passing the mixed vapors of an olefin and steam into contact with a calcium nickel phosphate catalyst at a temperature of from about 550*C. to about 750*C., the improvement which comprises intermingling with said mixed vapors before contact with said catalyst from about 4.5 to about 50 parts/wt. per million parts/wt. of the total of said mixed vapors, of a sulfur containing material characterized by the formula: (A)m - S - (D)n where (A) is selected from the group consisting of a hydrogen atom, an oxygen atom, and alkyl and aryl hydrocarbon radicals containing from one to about 20 carbon atoms; (D) is selected from the group consisting of a hydrogen atom and alkyl and aryl hydrocarbon radicals containing from one to about 20 carbon atoms; and m and n are integers which can be the same or different and range from 1 to 2.
Claim 2
Dependent Claim
38 words
The method as defined in claim 2 wherein the said sulfur-containing composition is hydrogen sulfide added as a vapor in a proportion of from about 5 to about 25 parts/wt. per million parts/wt. of said total mixed vapors.
Claim 3
Dependent Claim
63 words
The method as defined in claim 2 wherein the said olefin is a butene, the steam is present in proportions of from about 15 and about 20 volumes per volume of butene, and the said sulfur-containing composition is hydrogen sulfide which is added in the proportion of from about 5 and about 25 ppm based on the total weight of said mixed vapors.
Claim 4
Dependent Claim
14 words
Process as claimed in claim 2 wherein the said sulfur-containing composition is aN organomercaptan.
Claim 5
Dependent Claim
194 words
A process for catalytically oxydehydrogenating olefins containing from four to six carbon atoms to diolefins comprising forming a mixture of the vapors of an olefin of said class and steam in steam:olefin volume ratio of 15:1 to 20:1, from about 4, 200 to about 29,000 parts/wt. of oxygen per million parts/wt. of the total of said mixed vapors, and from about 5 to about 25 parts/wt. per million parts/wt. of the total of said mixed vapors, of a sulfur-containing compound characterized by the formula: (A)m - S - (D)n wherein A is selected from the group consisting of hydrogen atoms, oxygen atoms, and alkyl and aryl hydrocarbon radicals containing from one to about 20 carbon atoms; (D) is selected from the group consisting of hydrogen atoms and alkyl and aryl hydrocarbon radicals containing one to about 20 carbon atoms; and m and n are integers which may be the same or different and range from 1 to 2, passing the resulting mixture f vapors through a bed of a calcium nickel phosphate dehydrogenation catalyst at a temperature from about 450* to 700*C, and recovering the diolefins formed from the vapors issuing from said bed.
Claim 6
Dependent Claim
35 words
The method as defined in claim 6 and further characterized by said olefin being a butene and said sulfur containing composition being hydrogen sulfide, the latter being added continuously to the incoming butene feed stream.
Claim 7
Dependent Claim
184 words
In a process for catalytically dehydrogenating butenes to produce butadiene-1,3 over a calcium nickel phosphate dehydrogenation catalyst at a temperature between about 450*C. to about 750*C., the improvement which comprises feeding to such catalyst along with a mixed butene feed containing between about 15 and about 20 volumes of steam per volume of said butene feed and from about 5 to abut 25 parts/wt., per million parts by weight total of said mixed feed, of a sulfur-containing material characterized by the formula: (A)m - S - (D)n wherein (A) is selected from the group consisting of a hydrogen atom, a carbon atom, an oxygen atom, and alkyl and aryl hydrocarbon radicals containing from one to about 20 carbon atoms; (D) is selected from the class consisting of a hydrogen atom and alkyl and aryl hydrocarbon radicals containing from one to about 20 carbon atoms, and m and n are integers which may be the same or different and range from 1 to 2, and maintaining feed of said sulfur-containing material to the catalyst during addition of olefin throughout the useful life of said catalyst.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |