# US 2010/0137670 A1 · Process and apparatus for injecting oxygen into a reaction gas flowing through a synthesis reactor

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- Number: US 2010/0137670 A1
- Document ID: US20100137670A1
- Status: Published application
- Kind: A1
- Application number: 12/312,502
- Filed: 2007-11-05
- Published: 2010-06-03
- Earliest claimed: 2006-11-16
- Assignees: Uhde GmbH
- Inventors: Max Heinritz-Adrian; Stefan Hamel; Lothar Semrau
- Web page: https://patentgrep.com/patent/US20100137670A1

## CPC

- B01F 25/3132: {by using two or more injector devices}
- B01F 23/10: Mixing gases with gases
- B01F 25/23: Mixing by intersecting jets
- B01J 8/025: {in a cylindrical shaped bed}
- B01J 8/0278: {Feeding reactive fluids (for solid material B01J8/0015)}
- B01J 2208/00221: comprising baffles for guiding the flow of the heat exchange medium
- B01J 2208/00707: Fouling
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

Synthesis reactor comprising an apparatus for injecting oxygen, which can be initially charged in pure form, as air, or mixed with inert gas or water vapor, into a reaction gas which can flow through the synthesis reactor which finds use, for example, in an oxydehydrogenation plant, wherein oxygen and reaction gas have different temperatures, wherein a distribution element is provided upstream of the device for accommodating a catalyst charge in flow direction of the reaction gas, said distributor element comprising a distributor body, two tube plates and a multitude of gas guide tubes for passing the reaction gas through, and the oxygen can be supplied to the chamber between the gas guide tubes, wherein at least one baffle plate is arranged orthogonally to the gas guide tubes and divides the intermediate space into at least two distributor chambers, wherein the distributor chambers are connected to one another or merge into one another fluidically through one or more orifices, at least one gas line leads into the first distributor space in flow direction, through which the oxygen can be supplied, and the lower tube plate is provided in flow direction with a multitude of orifices in the form of nozzles, bores or the like, through which the oxygen can leave the intermediate space, wherein a solids-free gas mixing zone is provided below the lower tube plate.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

A synthesis reactor including a device for injecting oxygen, which is supplied in pure form, in air or mixed with inert gas or steam, into a reaction gas which flows through the synthesis reactor as, for example, used in an oxydehydrogenation plant, the oxygen and the reaction gas being of different temperatures, wherein a distribution device is provided in direction of the reaction gas flow upstream of the compartment accommodating the catalyst charge, consisting of a distributor body, two tube sheets and a plurality of gas guide tubes for the passage of the reaction gas, and the oxygen can be supplied to the intermediate space between the gas guide tubes, wherein
at least one baffle plate is arranged orthogonally to the gas guide tubes, which subdivides the intermediate space into at least two distribution chambers, the distribution chambers being interconnected via one or several openings or intertwining so to ensure the fluid passage, and
at least one gas line by which the oxygen can be supplied runs into the first distribution chamber in direction of the flow, and
the lower tube sheet indirection of the flow is provided with a plurality of openings in the form of nozzles, boreholes or the like, through which the oxygen can escape from the intermediate space,
a solid-free gas mixing zone being provided underneath the lower tube sheet.

### Claim 13 (depends on 12)

The synthesis reactor according to claim 12, wherein the distance between the boreholes or openings and the surface of the catalyst charge is not below 40 mm and not above 250 mm.

### Claim 14 (depends on 12)

The synthesis reactor according to claim 12, wherein the boreholes or nozzles which are arranged in the lower tube sheet are inclined from the perpendicular.

### Claim 15 (depends on 14)

The synthesis reactor according to claim 14, wherein the boreholes or nozzles are inclined in tangential direction from the perpendicular.

### Claim 16 (depends on 14)

The synthesis reactor according to claim 14, wherein every borehole or nozzle is directed towards the axis of an individual gas guide tube below the outlet of that respective gas guide tube, also allowing that several boreholes or nozzles are directed to the axis of a feed tube below the outlet of that respective gas guide tube.

### Claim 17 (depends on 12)

The synthesis reactor according to claim 12, wherein the gas guide tubes for conveying the reactor gas are arranged in concentric circles inside the reactor.

### Claim 18 (depends on 12)

The synthesis reactor according to claim 12, wherein the gas guide tubes are arranged to each other at an angle of 45° or 30° or 60°.

### Claim 19 (depends on 12)

A process involving a synthesis reactor according to claim 12, wherein the oxygen leaves the individual nozzle at a gas velocity of at least 60 m/s.

### Claim 20 (depends on 19)

The process according to claim 19, wherein the oxygen is completely or nearly completely mixed with the reaction gas leaving the gas guide tubes prior to entering the catalyst charge, a nearly complete mixing result being obtained if the minimum oxygen concentration in the gas is above 60% of the average oxygen concentration.

### Claim 21 (depends on 19)

The process according to claim 19, wherein the temperature of the oxygen upon entry into the gas mixing zone is the same or nearly the same at all nozzles, wherein a nearly uniform temperature is achieved if the temperature difference between the nozzles is below 100° C.

### Claim 22 (depends on 19)

The process according to claim 19, wherein a heat exchange between the supplied oxygen at the gas guide tubes and the space around the gas guide tubes is effected to ensure that the oxygen which enters the gas mixing chamber is essentially of the same temperature as the reaction gas in that chamber.

### Claim 23 (depends on 13)

The synthesis reactor according to claim 13, wherein the distance between the boreholes or openings and the surface of the catalyst charge is 120 mm.

### Claim 24 (depends on 19)

The process involving a synthesis reactor according to claim 19, wherein the oxygen leaves the individual nozzle at a gas velocity of at least 100 m/s.

### Claim 25 (depends on 24)

The process involving a synthesis reactor according to claim 24, wherein the oxygen leaves the individual nozzle at a gas velocity of at least 140 m/s.

### Claim 26 (depends on 19)

The process according to claim 19, wherein the oxygen is completely or nearly completely mixed with the reaction gas leaving the gas guide tubes prior to entering the catalyst charge, a nearly complete mixing result being obtained if the minimum oxygen concentration in the gas is above 80% of the average oxygen concentration.

### Claim 27 (depends on 26)

The process according to claim 26, wherein the oxygen is completely or nearly completely mixed with the reaction gas leaving the gas guide tubes prior to entering the catalyst charge, a nearly complete mixing result being obtained if the minimum oxygen concentration in the gas is above 90% of the average oxygen concentration.

### Claim 28 (depends on 19)

The process according to claim 19, wherein the temperature of the oxygen upon entry into the gas mixing zone is the same or nearly the same at all nozzles, wherein a nearly uniform temperature is achieved if the temperature difference between the nozzles is below 50° C.

### Claim 29 (depends on 19)

The process according to claim 19, wherein the temperature of the oxygen upon entry into the gas mixing zone is the same or nearly the same at all nozzles, wherein a nearly uniform temperature is achieved if the temperature difference between the nozzles is below 30° C.