US4256783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic vapor phase oxidation reactor apparatus
Assignee: Nippon Shokubai Co Ltd
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Filing: 1979-05-09
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Granted: 1981-03-17
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Expires: 1999-05-09
Abstract
Abstract A catalytic vapor phase oxidation reactor which comprises a fixed-bed shell and tube heat exchange apparatus in which a bundle of a multiplicity of tubes filled with at least one type of oxidizing catalyst are disposed in a shell and these tubes are passed through the apertures formed in at least one perforated shield plate to partition the inside of the shell into at least two heat transfer medium feed zones and in such a manner that each of the tubes passing through the perforated shield plate is not in direct contaction with the shield plate but the outer surface of the tube and the inner surface of the aperture are spaced apart by a distance of between 0.2-5 mm, supplying feed gas to the tubes of the reactor, and conducting exothermic catalytic vapor phase oxidation while controlling the temperatures for the heat transfer medium in each of the zones so that the temperature difference between each of the zones can be maintained between 0°-100° C.
Inventors
- 👤 Masahiro Takada
- 👤 Hiroyuki Uhara
- 👤 Takahisa Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:26
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/06; B01J8/067; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; C07C51/31; C07C51/313; F; F28; F28D; F28D7/00; F28D7/0066; F28D7/16; F28F; F28F9/00; F28F9/22; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00168; B01J2208/00212; B01J2208/00221; B01J2208/00256; B01J2208/02; B01J2208/023; B01J2208/024; B01J2208/025; B01J2219/00; B01J2219/00761; B01J2219/00763; B01J2219/00765; B01J2219/00777; F28F2009/222; F28F2009/226
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A fixed-bed shell and tube heat exchange type reactor for use in exothermic catalytic vapor phase oxidation, comprising: a bundle of a multiplicity of tubes filled with at least one type of oxidizing catalyst disposed in said shell, said tubes being passed through apertures provided in at least one perforated shield plate to partition the inside of said shell into at least two heat transfer medium feed zones in such a manner that each of said tubes passing through said perforated shield plate is not in direct contact with said shield plate, the outer surface of said tube and the inner surface of the apertures provided in said shield plate are spaced apart by a distance of between 0.2-5 mm.
Claim 2
Dependent Claim
120 words
A fixed-bed shell and tube heat exchange type reactor for use in exothermic catalytic vapor phase oxidation, comprising: a bundle of a multiplicity of tubes filled with at least one type of oxidizing catalyst disposed in said shell, said tubes being passed through apertures provided in at least one perforated shield plate to partition the inside of said shell into at least two heat transfer medium feed zones in such a manner that each of said tubes passing through said perforated shield plate is not in direct contact with said shield plate, the outer surface of said tube and the inner surface of the apertures provided in said shield plate are spaced apart by a distance of between 0.2-5 mm.
Claim 3
Dependent Claim
26 words
A reactor according to claim 1, wherein each of said heat transfer medium feed zones is respectively provided with means for circulating the heat transfer medium.
Claim 4
Dependent Claim
29 words
A reactor according to claim 2, wherein only one shield plate is provided on the inside of said shell partitioning said shell into two heat transfer medium feed zones.
Claim 5
Dependent Claim
32 words
A reactor according to claim 2, wherein the gap between the outer surface of said tubes and the inner surface of the aperture in the perforated shield plate is between 0.3-1 mm.
Claim 6
Dependent Claim
57 words
A reactor according to claim 2, wherein said tubes include fins having an outer diameter of a size capable of covering the gap between the outer surface of said tube and the inner surface of said aperture in said perforated shield plate, said fins being individually secured to said tubes in the vicinity of said shield plate.
Claim 7
Dependent Claim
20 words
A reactor according to claim 5, wherein the annular fins are flat and are generally parallel to said shield plate.
Claim 8
Dependent Claim
20 words
A reactor according to claim 5, wherein said annular fins are provided only on one side of said shield plate.
Claim 9
Dependent Claim
20 words
A reactor according to claim 5, wherein said annular fins are provided alternately on both sides of said shield plate.
Claim 10
Dependent Claim
30 words
A reactor according to claim 5, wherein said annular fins are generally conically-shaped and disposed so as to outwardly open toward the gap between said tube and said shield late.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |