US4834962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for the catalytic reaction of gases
Assignee: Huels AG
•
Filing: 1988-03-16
•
Granted: 1989-05-30
•
Expires: 2008-03-16
Abstract
Abstract A process for the catalytic gaseous phase reaction of a reactive gas wherein the heat of reaction generated produces a temperature elevation of less than about 150° C. in the substantially adiabatic reaction system, the improvement comprising: heating the cold reactive gas by passing it through a heated regenerative material present in the first portion of a vessel; passing the heated reactive gas through a solid catalyst for the reaction present in a second portion of the vessel to form a gaseous product stream; redirecting the gaseous product stream; passing the redirected gaseous product stream through the solid catalyst for the reaction present in the second portion of the vessel to form additional gaseous product, cooling the gaseous product stream by passing it through a cooled regenerative material present in the first portion of the vessel; and periodically reversing the flow direction in the portions of the reaction system.
Inventors
- 👤 Gerhard Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:54
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; B01J; B01J8/00; B01J8/02; B01J8/04; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00044; B01J2208/00061; B01J2208/00477; B01J2208/00495; B01J2208/00504; B01J2208/0053; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/13
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
208 words
A process for the catalytic gaseous phase reaction of a reactive gas wherein the heat of reaction generated produces a temperature elevation of less than about 150° in a substantially adiabatic reaction system, the improvement comprising: providing a cold reactive gas having a temperature of about 20° to 100° C.; heating the cold reactive gas by passing said gas in a first direction through a heated regenerative material present in a first part of a first stage; passing the heated reactive gas concurrently to said first direction through a solid catalyst for the reaction present in a second part of said stage to form a gaseous product stream; passing the partially reacted gaseous product stream in a second direction concurrently to said first direction through a solid catalyst for the reaction present in a second part of a second stage to form additional gaseous product in said product stream; cooling the latter gaseous product stream by passing said stream concurrently to said second direction through a regenerative material present in a first part of said second stage, said regenerative material being cooler than said product stream; and periodically reversing the flow direction in said parts and stages, said stages being housed in rotatable zones, and rotating said stages.
Claim 2
Dependent Claim
208 words
A process for the catalytic gaseous phase reaction of a reactive gas wherein the heat of reaction generated produces a temperature elevation of less than about 150° in a substantially adiabatic reaction system, the improvement comprising: providing a cold reactive gas having a temperature of about 20° to 100° C.; heating the cold reactive gas by passing said gas in a first direction through a heated regenerative material present in a first part of a first stage; passing the heated reactive gas concurrently to said first direction through a solid catalyst for the reaction present in a second part of said stage to form a gaseous product stream; passing the partially reacted gaseous product stream in a second direction concurrently to said first direction through a solid catalyst for the reaction present in a second part of a second stage to form additional gaseous product in said product stream; cooling the latter gaseous product stream by passing said stream concurrently to said second direction through a regenerative material present in a first part of said second stage, said regenerative material being cooler than said product stream; and periodically reversing the flow direction in said parts and stages, said stages being housed in rotatable zones, and rotating said stages.
Claim 3
Dependent Claim
42 words
A process of claim 1, wherein the product stream is passed through a plurality of stages equivalent to said first stage and a plurality of stages equivalent to said second stage, the flow directions in all stages being periodically and cyclically reversed.
Claim 4
Dependent Claim
72 words
A process according to claim 2, wherein the stages are conducted in an apparatus suitable for undertaking both heat exchange and catalytic reaction therein, comprising parallel and separate ducts for providing said stages, a redirecting chamber being formed at the bottom of said ducts for reversing the flow direction out of the ducts forming the first stages so that it flows in the opposite direction with the ducts forming the second stages.
Claim 5
Dependent Claim
41 words
A process according to claim 2, wherein the process further comprises adjusting the temperature of the cold reactive gas by either adding a gaseous reactive additive, or adding a cooling gas into the reactive gas before it enters the first stages.
Claim 6
Dependent Claim
29 words
A process as claimed in claim 2, wherein the cold reactive gas is heated in the first stage to at least the desired activation temperature of the catalytic reaction.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 1, wherein the cold reactive gas is substantially entirely reacted in a single vessel.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 2, wherein the amount of heat carried along with the cooled gaseous product stream is substantially equal to the amount of heat exothermically produced by the reaction.
Claim 9
Dependent Claim
50 words
A process according to claim 4, further comprising adjusting the amount of additionally introduced reactive gas or cooling gas added to effect a desired temperature change to the reactive gas stream as a function of the lowest or highest temperature respectively, of the gas as it exits said first stages.
Claim 10
Dependent Claim
37 words
A process as claimed in claim 4, further comprising adjusting the amount of reactive additive or cooling gas by controlling the average temperature in a redirecting chamber wherein the first direction is changed into the second direction.
Claim 11
Dependent Claim
17 words
A process as claimed in claim 2, wherein the reaction is a combustion of an effluent stream.
Claim 12
Dependent Claim
25 words
A process as claimed in claim 2, wherein the regenerative material is selected from ceramic pieces or ceramic or metal members with longitudinal holes (honeycombs).
Claim 13
Dependent Claim
20 words
A process as claimed in claim 2, wherein the temperature elevation produced ranges from about 100 degrees to 5 degrees.
Claim 14
Dependent Claim
44 words
A process according to claim 3, further comprising rotating about the axis of the filling chamber said ducts so as to cause the section of the filling chamber which is entered by the reactive gas to be periodically entered by the gaseous product stream.
Claim 15
Dependent Claim
21 words
A process according to claim 2, wherein the reactive gas contains nitrogen oxides which can be reduced by reaction with ammonia.
Claim 16
Dependent Claim
19 words
A process according to claim 1 wherein the reactive gas contains 0.001 to 10% by volume of reactive compounds.
Claim 17
Dependent Claim
19 words
A process according to claim 1 wherein the reactive gas contains 0.1 to 1% by volume of reactive compounds.
Claim 18
Dependent Claim
38 words
A process according to claim 13 further comprising adjusting the rotational speed in order to obtain a desired reaction temperature in the zone of catalytic reactions, the higher the speed, the higher the peak temperature in the catalyst.
Claim 19
Dependent Claim
22 words
A process according to claim 1 wherein said second part of the first stage is conducted without any cooling of the catalyst.
Claim 20
Dependent Claim
26 words
A process according to claim 1, wherein at an adiabatic exotherm of 30 degrees, said stages are rotated at a rate of 2-20 revolutions per hour.
Claim 21
Dependent Claim
26 words
A process according to claim 1, wherein at an adiabatic exotherm of 80 degrees, said stages are rotated at a rate of 2-5 revolutions per hour.
Claim 22
Dependent Claim
19 words
A process according to claim 1, wherein said stages are rotated at a rate of 2-20 revolutions per hour.
Claim 23
Dependent Claim
60 words
A process according to claim 1, wherein said cold reactive gas is a waste gas from a chemical process, a coating process, a printing plant, a tire production plant, a leather tanning plant, a textile cleaning plant, a biological wastewater treatment plant, an animal farming facility, a garbage processing facility, an animal carcass utilization facility, or power plant flue gases.
Claim 24
Dependent Claim
18 words
A process according to claim 1, wherein said cold reactive gas is a gas from a chemical process.
References Cited (Backward Citations)
US3189417A
Cited
US3407045A
Cited
US3957444A
Cited
US3897439A
Cited
US3997294A
Cited
US4215099A
Cited
US4391880A
Cited
US4418046A
Cited
EP0037119A1
Cited
JPH05221277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |