US4083889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing ethylene
Assignee: Mobil Oil AS
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Filing: 1977-05-26
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Granted: 1978-04-11
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Expires: 1997-05-26
Abstract
Abstract Ethylene is produced by catalytic conversion of a methanol feed in the presence of steam or water diluent. The catalyst employed is exemplified by HZSM-5, a crystalline aluminosilicate zeolite, and the conversion is conducted at relatively low temperature, i.e. from about 600 DEG F to about 750 DEG F. The hydrocarbon conversion product contains at least 18 wt.% ethylene.
Inventors
- 👤 Philip Dornin Caesar
- 👤 Roger Allen Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:33
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; C07C2521/00; C07C2521/06; C07C2521/08; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
In a method for producing a hydrocarbon mixture rich in olefins by contacting a methanol feed and a diluent with a catalyst comprising a crystalline aluminosilicate zeolite having a constraint index of 1.0 to 12.0, a silica to alumina ratio of at least about 12 and a dried crystal density in the hydrogen form of not substantially less than 1.6 grams per cubic centimeter, said contacting being effected under conversion conditions, the improvement, whereby increasing the ethylene content of said hydrocarbon mixture, which comprises: contacting said methanol feed with said zeolite catalyst at a temperature of about 600° F to about 750° F, at a WHSV of methanol of 0.2-20, at a pressure of 0 to 135 p.s.i.g., said contacting being effected in the presence of 2 to 20 mols of steam per mol of methanol feed; and converting from about 40 wt.% to about 90 wt.% of said methanol feed to said hydrocarbon mixture having an increased ethylene content.
Claim 2
Dependent Claim
160 words
In a method for producing a hydrocarbon mixture rich in olefins by contacting a methanol feed and a diluent with a catalyst comprising a crystalline aluminosilicate zeolite having a constraint index of 1.0 to 12.0, a silica to alumina ratio of at least about 12 and a dried crystal density in the hydrogen form of not substantially less than 1.6 grams per cubic centimeter, said contacting being effected under conversion conditions, the improvement, whereby increasing the ethylene content of said hydrocarbon mixture, which comprises: contacting said methanol feed with said zeolite catalyst at a temperature of about 600° F to about 750° F, at a WHSV of methanol of 0.2-20, at a pressure of 0 to 135 p.s.i.g., said contacting being effected in the presence of 2 to 20 mols of steam per mol of methanol feed; and converting from about 40 wt.% to about 90 wt.% of said methanol feed to said hydrocarbon mixture having an increased ethylene content.
Claim 3
Dependent Claim
21 words
The improved method claimed in claim 1 wherein said hydrocarbon mixture of increased ethylene content contains at least 18 wt.% ethylene.
Claim 4
Dependent Claim
26 words
The improved method claimed in claim 2 wherein said ethylene content is also at least 1.5 wt.% higher than obtained in the absence of said diluent.
Claim 5
Dependent Claim
14 words
The improved method claimed in claim 2 wherein said crystalline aluminosilicate zeolite is HZSM-5.
Claim 6
Dependent Claim
19 words
The improved method claimed in claim 4 wherein said HZSM-5 has a crystallite size greater than about 0.5 micron.
Claim 7
Dependent Claim
35 words
The improved method of claim 4 wherein said hydrocarbon mixture of increased ethylene content contains at least 18 wt.% ethylene, and at least 1.5 wt.% more ethylene than obtained in the absence of said diluent.
Claim 8
Dependent Claim
11 words
The improved method of claim 4 wherein said HZSM-5 is silica-coated.
Claim 9
Dependent Claim
41 words
The improved method of claim 2 wherein said contacting is effected in the presence of up to 20 mols of diluent, said diluent consisting of 3 to 10 mols of steam per mol of methanol feed supplemented with an inert diluent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |