US4545879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodesulphurization of hydrocracked pitch
Assignee: Ministry of Natural Resources and Wildlife
•
Filing: 1984-07-13
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Granted: 1985-10-08
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Expires: 2004-07-13
Abstract
Abstract An exceptionally effective technique has been developed for desulphurizing hydrocracked petroleum pitch containing organic molecules having at least some chemically bound sulphur. Particles of petroleum pitch and a para- or ferromagnetic material catalyst are intimately mixed and this mixture in the presence of hydrogen is subjected to microwave radiation so as to generate a high intensity oscillating electric field thereby releasing at least part of the chemically bound sulphur from the pitch as sulphur-containing gases without substantial increase of the temperature of the pitch and separating the sulphur containing gases thus formed. To avoid temperature rise during desulphurization, the microwave irradiation is preferably gated in a train of short pulses.
Inventors
- 👤 Jeffrey K. S. Wan
- 👤 Jaroslav F. Kriz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:52
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/122; B01J19/126; C; C10; C10C; C10C3/00; Y; Y10; Y10S; Y10S44/00; Y10S44/904; Y10S44/905
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
116 words
A method of desulphurizing a petroleum pitch containing organic molecules having at least some chemically bound sulphur, comprising the steps of: (a) effecting intimate mixing between particles of petroleum pitch and particles of a para- or ferromagnetic metallic catalyst, (b) subjecting the pitch-catalyst particulate mixture in the presence of hydrogen to a train of short pulses of microwave radiation so as to generate a high intensity oscillating electric field thereby creating a microwave enhanced surface reaction whereby chemically bound sulphur in the pitch particles reacts with the hydrogen and is released from the pitch particles as sulphur-containing gases without substantial increase of the temperature of the pitch particles, and (c) separating the sulphur-containing gases thus formed.
Claim 2
Independent Claim
116 words
A method of desulphurizing a petroleum pitch containing organic molecules having at least some chemically bound sulphur, comprising the steps of: (a) effecting intimate mixing between particles of petroleum pitch and particles of a para- or ferromagnetic metallic catalyst, (b) subjecting the pitch-catalyst particulate mixture in the presence of hydrogen to a train of short pulses of microwave radiation so as to generate a high intensity oscillating electric field thereby creating a microwave enhanced surface reaction whereby chemically bound sulphur in the pitch particles reacts with the hydrogen and is released from the pitch particles as sulphur-containing gases without substantial increase of the temperature of the pitch particles, and (c) separating the sulphur-containing gases thus formed.
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein the microwave radiation is in the range 2-10 GHz.
Claim 4
Dependent Claim
16 words
The method according to claim 2 wherein the catalyst is a metal or metal hydride powder.
Claim 5
Dependent Claim
14 words
The method according to claim 1 or 2 wherein the catalyst is iron powder.
Claim 6
Dependent Claim
25 words
The method according to claim 1 or 2 wherein the catalyst is an alloy containing at least two of nickel, copper, lithium, lanthanum and calcium.
Claim 7
Dependent Claim
25 words
The method according to claim 1 or 2 wherein the catalyst is an alloy containing at least two metals selected from nickel, copper and lithium.
Claim 8
Dependent Claim
20 words
The method according to claim 1 or 2 wherein the microwave irradiation is gated in a train of short pulses.
Claim 9
Dependent Claim
32 words
The method according to claim 1 wherein the pitch particles are of a -100 mesh size and the microwave irradiation in the presence of hydrogen is conducted at or near atmospheric pressure.
References Cited (Backward Citations)
US2550089A
Cited
US2553944A
Cited
US3616375A
Cited
US3503865A
Cited
US4087348A
Cited
US4076607A
Cited
US4113606A
Cited
US4180452A
Cited
US4123230A
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US4234402A
Cited
US4279722A
Cited
US4357229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-07 | 1989-04-08 | 1989-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-07 | 1993-04-08 | 1993-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-07 | 1997-04-08 | 1997-10-08 | $7700.00 | Window Closed / Lapsed |