US3593779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for quenching thermally cracked gas
Assignee: Idemitsu Petrochemical Co Ltd
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Filing: 1969-08-25
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Granted: 1971-07-20
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Expires: 1989-08-25
Abstract
Abstract Quenching of thermally cracked gas of hydrocarbons is carried out by the use of a first stage heat exchanger and one of two or more second stage heat exchangers which are arranged in parallel and connected to the first stage one and each of which is used alternately after removal of deposited coke, whereby the operation of a thermal cracking furnace can be carried out continuously for much longer period than ever before.
Inventors
- 👤 Ichiro Tokumitsu
- 👤 Minoru Sugiyama
- 👤 Souji Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:17
CPC Classifications
B; B01; B01D; B01D51/00; B01D51/10; C; C10; C10G; C10G9/00; C10G9/002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
4 words
a standby step, and
Claim 2
Dependent Claim
29 words
The method of claim 1 wherein said thermally cracked gases are derived from the thermal cracking of light naphtha having a boiling point between 40* C and 170* C.
Claim 3
Dependent Claim
4 words
a standby step, and
Claim 4
Dependent Claim
50 words
a heat exchange step; f. said other(s) of said at least two heat exchanger zones being at either the cleaning step or the standby step of its operation cycle while said one of said at least two heat exchanger zones is at the heat exchange step of its operation cycle.
Claim 5
Dependent Claim
39 words
The method of claim 1 wherein said gases are quenched to a temperature of 450*-550* C in said first heat exchange stage and are further quenched down to a temperature of 350*-450* C in said second heat exchange stage.
Claim 6
Dependent Claim
50 words
a heat exchange step; e. said other(s) of said at least two heat exchanger zones being at either the cleaning step or the standby step of its operation cycle while said one of said at least two heat exchanger zones is at the heat exchange step of its operation cycle.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein said thermally cracked gases are quenched in said heat exchanger zones by indirect heat transfer with high pressure water.
Claim 8
Independent Claim
118 words
A method for quenching thermally cracked hydrocarbon gases which comprises: a. conducting thermally cracked hydrocarbon gases from a thermal cracking furnace through a first heat exchanger zone in a first heat exchange stage in order to quench said thermally cracked gases; b. removing said gases from said first heat exchanger zone; c. injecting residual oil from the thermal cracking of naphtha into said gases in order to cool said gases; d. passing said gases with the residual oil injected therein through only one of at least two heat exchanger zones in a second heat exchange stage in order to further quench said gases; e. said at least two heat exchanger zones having a sequential operation cycle consisting of
Claim 9
Dependent Claim
39 words
The method of claim 5 wherein said gases are quenched to a temperature of 450*-550* C in said first heat echange stage and are further quenched down to a temperature of 350*-450* C in said second heat exchange stage.
Claim 10
Independent Claim
153 words
An apparatus for quenching thermally cracked hydrocarbon gases which comprises: a. a first stage heat exchanger means for quenching said gases; b. said first stage heat exchanger means having an inlet for said thermally cracked gases and an outlet for said thermally cracked gases; c. at least two second stage heat exchanger means for further quenching said gases and being connected in parallel to said first heat exchanger means; d. said at least two second stage heat exchanger means each containing inlet means and outlet means for said thermally cracked gases; e. said outlet for the first stage heat exchanger means connecting to said inlet means for each of said at least two second stage heat exchanger means; f. said inlets for each of said at least two second stage heat exchanger means having value means; and g. one of said valve means being open while the other said valve means is closed.
Claim 11
Dependent Claim
19 words
The apparatus of claim 7 wherein at least one heat exhanger means is a shell and tube heat exchanger.
Claim 12
Dependent Claim
29 words
The apparatus of claim 7 wherein both said first stage heat exchanger means and said at least two second stage heat exchanger means are shell and tube heat exchangers.
Claim 13
Independent Claim
197 words
An apparatus for quenching thermally cracked hydrocarbon gases which comprise: a. a first stage heat exchanger means for quenching said gases; b. said first stage heat exchanger means having inlet means for saiD thermally first stage heat exchanger means having inlet means for said cracked gases and outlet means for said thermally cracked gases; c. at least two second stage heat exchanger means for further quenching said gases that are connected in parallel to said first stage heat exchanger means; d. said at least two second stage heat exchanger means each containing inlet means and outlet means for said thermally cracked gases; e. said outlet means for the first stage heat exchanger means connecting to said inlet means for each of said at least two second stage heat exchanger means; f. inlet means for injecting oil to cool said thermally cracked gases which is located between said first-step heat exchanger means and said at least two second stage heat exchanger means; g. said inlets for each of said at least two second stage heat exchanger means having valve means; and h. one of said valve means being open while the other of said valve means is closed.
References Cited (Backward Citations)
US2886483A
Cited
US2877866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |