CN213060206U

CN213060206U - Hydrogenation tower for producing hydrogen peroxide by anthraquinone process

Info

Publication number: CN213060206U
Application number: CN202021362987.9U
Authority: CN
Inventors: 徐向晖; 林晨; 陆棋; 徐杭; 方永; 王红伟; 楼生龙; 张丹妮
Original assignee: China National Air Separation Engineering Co ltd
Current assignee: China National Air Separation Engineering Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-04-27
Anticipated expiration: 2030-07-13
Also published as: AU2020102888A4

Abstract

The application discloses a hydrogenation tower for producing hydrogen peroxide by an anthraquinone process, which comprises a hydrogenation tower shell and a feed pump, wherein the hydrogenation tower shell comprises an upper section shell and a lower section shell, and catalyst filler layers are arranged inside the upper section shell and inside the lower section shell; a hydrogen inlet is arranged on the side part of the upper section shell, a working liquid inlet pipe penetrates into the upper end of the upper section shell, the inlet end of the working liquid inlet pipe is positioned outside the upper section shell and is connected with a feed pump through a pipeline, the outlet end of the working liquid inlet pipe is sealed, a plurality of spray heads are uniformly arranged below the working liquid inlet pipe at intervals, and a catalyst packing layer in the upper section shell is arranged right below the spray heads; the lower shell is internally provided with a liquid distribution plate which is arranged right above the catalyst packing layer in the lower shell, and the bottom of the lower shell is provided with a working liquid outlet. By adopting the hydrogenation tower structure, the hydrogenation reaction efficiency can be improved, the side reaction is reduced, and the production safety is greatly improved.

Description

Hydrogenation tower for producing hydrogen peroxide by anthraquinone process

Technical Field

The utility model relates to a hydrogenation tower for producing hydrogen peroxide by an anthraquinone process.

Background

The anthraquinone process is one main process of producing hydrogen peroxide, and includes compounding alkyl anthraquinone and organic solvent into work solution, introducing hydrogen for hydrogenation at 55-65 deg.c and 0.30MPa pressure and in the presence of catalyst, countercurrent oxidation with air (or oxygen) at 40-44 deg.c, extraction, regeneration, refining and concentration to obtain 20-30 wt% concentration hydrogen peroxide solution product.

In the current industrialized production of hydrogen peroxide by anthraquinone process, the inside of the hydrogenation tower is only dispersed by a liquid distribution plate, and the plate is provided with a plurality of uniform small holes and a downcomer. The downcomer is used to pass hydrogen gas and the orifice is used to pass liquid, and the diameter of the orifice is determined according to the diameter of the device and the flow rate of the system working liquid. During normal production, liquid distribution plate has the hydrops layer of certain thickness, has following technical problem: 1. if the system flow is too big, thereby perhaps local aperture because anthraquinone is appeared in the working solution and is blockked up the aperture, can arouse the high rising of hydrops layer, and high downcast pipe height is crossed in the hydrops layer, and liquid will pass through in the downcast pipe to lead to gaseous unable catalyst layer participation reaction of arriving through the downcast pipe, influence production. 2. When the system is produced when the flow is small, the thickness of the accumulated liquid layer is reduced, and the phenomenon of local bias flow can occur, so that the local catalyst layer has over reaction, and the side reaction is increased (the side reaction can generate anthraquinone degradation products, separate out crystals, wrap the catalyst surface, and influence the service time of the catalyst). In order to solve the above situation, the hydrogenation tower is provided with a sight glass at present for observing the height of the liquid accumulation layer, but the sight glass has a rupture risk because the hydrogenation tower is a pressure container, and certain potential safety hazards exist in the chemical industry production.

Disclosure of Invention

Aiming at the technical problems in the prior art, the hydrogenation tower for producing hydrogen peroxide by an anthraquinone process is provided, and the hydrogenation tower structure can improve the hydrogenation reaction efficiency, reduce the side reaction and greatly improve the production safety.

The hydrogenation tower for producing hydrogen peroxide by the anthraquinone process is characterized by comprising a hydrogenation tower shell and a feed pump, wherein the hydrogenation tower shell comprises an upper section shell and a lower section shell which are directly communicated, and catalyst filler layers for catalytic hydrogenation reaction are arranged in the upper section shell and the lower section shell; a hydrogen inlet is arranged on the side part of the upper section shell, a working liquid inlet pipe penetrates into the upper end of the upper section shell, the inlet end of the working liquid inlet pipe is positioned outside the upper section shell and is connected with a feed pump through a pipeline, the outlet end of the working liquid inlet pipe is sealed, a plurality of spray heads are uniformly arranged below the working liquid inlet pipe at intervals, and a catalyst packing layer in the upper section shell is arranged right below the spray heads; the lower shell is internally provided with a liquid distribution plate which is arranged right above the catalyst packing layer in the lower shell, and the bottom of the lower shell is provided with a working liquid outlet.

The hydrogenation tower for producing hydrogen peroxide by the anthraquinone method is characterized in that the liquid distribution plate comprises a support plate arranged on the inner wall of the lower shell and a plurality of air reducing pipes uniformly arranged on the upper surface of the support plate, a plurality of small holes are uniformly arranged on the support plate, the small holes in the support plate are used for allowing working liquid to pass through, and the air reducing pipes are used for allowing hydrogen to pass through.

The hydrogenation tower for producing hydrogen peroxide by the anthraquinone method is characterized in that a water-avoiding cover is arranged at the upper end of the downcomer and comprises a cover plate and supporting connecting pieces, and the cover plate is arranged right above an upper end opening of the downcomer at intervals through the supporting connecting pieces.

The hydrogenation tower for producing hydrogen peroxide by the anthraquinone process is characterized in that the number of catalyst filler layers arranged in the lower shell is 1-2, the number of the catalyst filler layers in the lower shell is the same as that of liquid distribution plates in the lower shell, and a liquid distribution plate is arranged right above each catalyst filler layer in the lower shell.

The hydrogenation tower for producing hydrogen peroxide by the anthraquinone process is characterized in that the catalyst filler layer is a catalyst bed layer formed by palladium catalyst particles.

Compared with the prior art, the beneficial effect that this application was got is:

this application has improved the hydrogenation tower, and under the transport effect of charge pump, working solution accessible working solution import pipe and a plurality of shower nozzles of below carry out the downstream jet, sprays the tiny working solution of dispersion and hydrogen under the action of gravity, carries out the even reaction through the catalyst packing layer, avoids appearing the circumstances such as local bias flow excessive reaction, can cancel the sight glass (avoided the cracked risk of sight glass), and the reaction degree is higher in upper casing. When the working solution continues to flow into the lower shell and continues to react, even if a certain local bias flow phenomenon occurs, the great adverse effect cannot be caused, the hydrogenation efficiency of the whole process is high, the side reaction degree is low, and the catalyst filler layer is long in single use.

Drawings

FIG. 1 is a schematic structural diagram of a hydrogenation tower for producing hydrogen peroxide by an anthraquinone process;

FIG. 2 is a schematic cross-sectional view of a liquid distribution plate of the present application;

in the figure: 1-hydrogenation tower shell, 2-working solution inlet pipe, 3-spray head, 4-catalyst packing layer, 5-support plate, 6-air reducing pipe and 6 a-water-avoiding cover.

Detailed Description

The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.

Example (b): compare FIGS. 1-2

A hydrogenation tower for producing hydrogen peroxide by an anthraquinone process comprises a hydrogenation tower shell 1 and a feed pump, wherein the hydrogenation tower shell 1 comprises an upper section shell and a lower section shell which are directly communicated, and catalyst filler layers 4 for catalytic hydrogenation reaction are arranged in the upper section shell and the lower section shell; the upper segment casing lateral part is equipped with hydrogen import 7, and the upper end of upper segment casing is inside to penetrate a working solution import pipe 2, the entrance point of working solution import pipe 2 is located the outside of upper segment casing and by the tube coupling with the charge pump, the exit end of working solution import pipe 2 seals, the even interval in below of working solution import pipe 2 sets up a plurality of shower nozzles 3 (during the structure of actual design equipment, need calculate shower nozzle quantity in detail, mounting height and spray area isoparametric, so that the spray area of 4 upper surfaces of catalyst packing layer in the upper segment casing is more suitable, and the spray area of two adjacent shower nozzles 3 can not have great alternately), catalyst packing layer 4 in the upper segment casing is located under shower nozzle 3. The lower shell is internally provided with a liquid distribution plate which is arranged right above the catalyst filler layer 4 in the lower shell, and the bottom of the lower shell is provided with a working liquid outlet.

Wherein the catalyst filling layer 4 can be a catalyst bed layer formed by stacking palladium catalyst particles.

Referring to fig. 1 and 2, the liquid distribution plate in the lower shell includes a supporting plate 5 disposed on the inner wall of the lower shell and a plurality of air pipes 6 uniformly disposed on the upper surface of the supporting plate 5, the supporting plate 5 is uniformly provided with a plurality of small holes, the small holes in the supporting plate 5 are used for passing through the working liquid, and the air pipes 6 are used for passing through the hydrogen.

For avoiding the in-process that the working solution flows downwards directly through the downcomer 6, the upper end of the downcomer 6 is provided with a water-avoiding cover 6a, the water-avoiding cover 6a comprises a cover plate and a supporting connecting piece, and the cover plate is arranged right above an opening at the upper end of the downcomer 6 through the supporting connecting piece at intervals.

The number of the catalyst filler layers 4 arranged in the lower shell is 1-2, the number of the catalyst filler layers 4 in the lower shell is the same as that of the liquid distribution plates in the lower shell, and a liquid distribution plate is arranged right above each catalyst filler layer 4 in the lower shell.

When the hydrogenation tower is used for hydrogenation reaction, the process is as follows:

under the transport effect of charge pump, the working solution carries out the downward injection through a plurality of shower nozzles of working solution import pipe and below, sprays the tiny working solution of dispersion and hydrogen under the action of gravity, carries out even reaction through the catalyst packing layer in the upper segment casing, local excessive reaction can not appear and lead to the too much condition of accessory substance, and the single live time of catalyst packing layer prolongs greatly. The hydrogenation reaction of anthraquinone process is a strong exothermic reaction, because the sprayed and dispersed fine working solution and hydrogen gas are uniformly reacted in the catalyst filler layer, the condition of local overheating can not occur (the safety of production is improved), and the reaction rate of this stage is also faster, and the reaction degree can reach more than 70%.

Working liquid flowing down from the upper section of the shell does not need to be collected, and then is sprayed and dispersed to the inside of the lower section of the shell through the feeding pump and the spray head, so that energy consumption is increased to a certain extent. Because the reaction degree in the upper casing is higher, the raw material concentration in the working solution flowing down from the upper casing has already declined a lot, even certain local bias current phenomenon appears, can not too big degree lead to excessive reaction (so can cancel the setting of sight glass, improve the security of operation), directly through liquid distribution plate after get into the catalyst packing layer continue the reaction can to improve hydrogenation's conversion rate, the working solution is discharged through the working solution export of lower section casing after the reaction is complete, get into next process.

The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.

Claims

1. A hydrogenation tower for producing hydrogen peroxide by an anthraquinone process is characterized by comprising a hydrogenation tower shell (1) and a feed pump, wherein the hydrogenation tower shell (1) comprises an upper section shell and a lower section shell which are directly communicated, and catalyst filler layers (4) for catalytic hydrogenation reaction are arranged in the upper section shell and the lower section shell; a hydrogen inlet (7) is arranged on the side part of the upper section shell, a working liquid inlet pipe (2) penetrates into the upper end of the upper section shell, the inlet end of the working liquid inlet pipe (2) is positioned outside the upper section shell and is connected with a feed pump through a pipeline, the outlet end of the working liquid inlet pipe (2) is sealed, a plurality of spray heads (3) are uniformly arranged below the working liquid inlet pipe (2) at intervals, and a catalyst packing layer (4) in the upper section shell is arranged right below the spray heads (3);

the lower shell is internally provided with a liquid distribution plate which is arranged right above the catalyst filler layer (4) in the lower shell, and the bottom of the lower shell is provided with a working liquid outlet.

2. The hydrogenation tower for producing hydrogen peroxide by the anthraquinone process according to claim 1, wherein the liquid distribution plate comprises a support plate (5) arranged on the inner wall of the lower shell and a plurality of downcomer pipes (6) uniformly arranged on the upper surface of the support plate (5), the support plate (5) is uniformly provided with a plurality of small holes, the small holes on the support plate (5) are used for passing through the working liquid, and the downcomer pipes (6) are used for passing through the hydrogen.

3. The hydrogenation tower for producing hydrogen peroxide by the anthraquinone process according to claim 2, wherein the upper end of the downcomer (6) is provided with a water-repellent cover (6a), the water-repellent cover (6a) comprises a cover plate and a supporting connecting piece, and the cover plate is arranged right above the upper end opening of the downcomer (6) at intervals through the supporting connecting piece.

4. The hydrogenation tower for producing hydrogen peroxide by an anthraquinone process according to claim 1, wherein the number of the catalyst filler layers (4) arranged in the lower shell is 1-2, the number of the catalyst filler layers (4) in the lower shell is the same as the number of the liquid distribution plates in the lower shell, and a liquid distribution plate is arranged right above each catalyst filler layer (4) in the lower shell.

5. The hydrogenation tower for producing hydrogen peroxide by the anthraquinone process according to claim 1, wherein the catalyst filler layer (4) is a catalyst bed layer formed by palladium catalyst particles.