US3907661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for quenching unstable gas
Assignee: Shell USA Inc
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Filing: 1973-12-28
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Granted: 1975-09-23
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Expires: 1993-12-28
Abstract
Abstract There is disclosed a process for quenching pyrolysis product by passing it through a quench zone into which quench liquid is introduced in sufficient quantity and in a manner to form abruptly a continuous liquid film on the wall of the quench zone and to cool the pyrolysis product to a temperature at which it is stable; the quench liquid being refractory and highly aromatic. There is also disclosed an apparatus including a cylindrical quench zone having means for introducing quench liquid against the walls thereof to form a liquid film abruptly.
Inventors
- 👤 John E Gwyn
- 👤 Lisle L Baldwin
- 👤 Howard Brodhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:15
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/06; C; C10; C10G; C10G9/00; C10G9/002; F28D; F28D21/00; F28D2021/0019; F28D2021/0075
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
158 words
A METHOD FOR QUENCHING THE EFFLUENT FROM A HYDROCARBON PYROLYSIS UNIT FRM TEMPERATURE IN EXCESS OF 1400*F TO A TEMPERATURE AT WHICH THE EFFLUENT IS STABLE, WHICH COMPRISES: A. PASSING SAID EFFLUENT THROUGH A CONDUIT, AND B. INTRODUCING AS THE SOLE QUENCHING FLUID A REFRACTORY, HIGHLY AROMATIC HYDROCARBON QUENCH LIQUID THROUGH THE WALL OF SAID CONDUIT IN A MANNER SUCH THAT THE RATIO OF RADICAL MOMENTIUM OF QUENCH LIQUID TO THE MOMENTIUM OF THE EFFLUENT PASSING THROUGH THE CONDUIT IS LESS THAN UNITY, THEREBY ABRUPTLY FORMING A CONTINUOUS LIQUID FILM ON THE CONDUIT WALL AT A TEMPERATURE BELOW THE DEW POINT OF THE EFFLUENT, SAID QUENCH LIQUID BEING INTRODUCED INTO THE CONDUIT IN THE FORM OF THE CONTINUOUS LIQUID FILM IN AN AMOUNT SUFFICIENT TO BOTH COOL THE EFFLUENT TO A TEMPERATURE AT WHICH IT IS STABLE AND TO MAINTAIN A CONTINUOUS LIQUID FILM ON ALL PORTIONS OF THE CONDUIT WALL UNTIL THE EFFLUENT REACHES A STABLE TEMPERATURE.
Claim 2
Independent Claim
158 words
A METHOD FOR QUENCHING THE EFFLUENT FROM A HYDROCARBON PYROLYSIS UNIT FRM TEMPERATURE IN EXCESS OF 1400*F TO A TEMPERATURE AT WHICH THE EFFLUENT IS STABLE, WHICH COMPRISES: A. PASSING SAID EFFLUENT THROUGH A CONDUIT, AND B. INTRODUCING AS THE SOLE QUENCHING FLUID A REFRACTORY, HIGHLY AROMATIC HYDROCARBON QUENCH LIQUID THROUGH THE WALL OF SAID CONDUIT IN A MANNER SUCH THAT THE RATIO OF RADICAL MOMENTIUM OF QUENCH LIQUID TO THE MOMENTIUM OF THE EFFLUENT PASSING THROUGH THE CONDUIT IS LESS THAN UNITY, THEREBY ABRUPTLY FORMING A CONTINUOUS LIQUID FILM ON THE CONDUIT WALL AT A TEMPERATURE BELOW THE DEW POINT OF THE EFFLUENT, SAID QUENCH LIQUID BEING INTRODUCED INTO THE CONDUIT IN THE FORM OF THE CONTINUOUS LIQUID FILM IN AN AMOUNT SUFFICIENT TO BOTH COOL THE EFFLUENT TO A TEMPERATURE AT WHICH IT IS STABLE AND TO MAINTAIN A CONTINUOUS LIQUID FILM ON ALL PORTIONS OF THE CONDUIT WALL UNTIL THE EFFLUENT REACHES A STABLE TEMPERATURE.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the quench liquid comprises cracked heavy gas oil and the effluent is quenched to below 700*F.
Claim 4
Dependent Claim
19 words
The process of claim 2 wherein said quench liquid comprises heavy gas oil separated from the pyrolysis unit effluent.
Claim 5
Dependent Claim
24 words
The process of claim 2 wherein said quench liquid comprises a mixture of heavy gas oil and bottoms separated from the pyrolysis unit effluent.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the effluent is quenched to 640*-660*F.
Claim 7
Dependent Claim
21 words
The process of claim 1 wherein quench liquid is introduced into the quench zone in contact with a continuous circumferential element.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein the ratio of the radial momentum of the liquid to the momentum of the gas is not more than 0.5.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein the conduit through which the pyrolysis effluent is passed is oriented horizontally.
Claim 10
Dependent Claim
29 words
The process of claim 1 wherein any coke deposits formed during the quenching process are removed by temporarily interrupting the flow of quench liquid introduced through the conduit wall.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |