CN210030505U - Crotonaldehyde reaction rectification device - Google Patents
Crotonaldehyde reaction rectification device Download PDFInfo
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- CN210030505U CN210030505U CN201920661630.1U CN201920661630U CN210030505U CN 210030505 U CN210030505 U CN 210030505U CN 201920661630 U CN201920661630 U CN 201920661630U CN 210030505 U CN210030505 U CN 210030505U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a crotonaldehyde reaction rectifier unit, including first reaction rectifying column, first reaction rectifying column top of the tower is equipped with acetaldehyde reflux unit, and first reaction rectifying column middle part reaction section is equipped with solid-borne catalytic reaction device, is equipped with butanol aldehyde dewatering device at the bottom of the first reaction rectifying column, and butanol aldehyde dewatering device is connected with crotonaldehyde rectifier unit. The condensation tower, the dehydration tower and the rectification tower are combined into one tower, the production flow is simplified, the production efficiency is improved, the occupied area is reduced, and the production cost is reduced. The supported catalytic reaction device comprises an immobilized catalyst bundling bag, the immobilized catalyst bundling bag comprises a filler pipe, an immobilized catalytic section and a hollow section are arranged in the filler pipe, the structure of the filler pipe increases the gas-liquid mass transfer space of the immobilized catalyst, products generated by reaction can be separated timely, the gas-liquid mass transfer efficiency is high, and the reaction is facilitated.
Description
Technical Field
The utility model belongs to the technical field of the technique and specifically relates to a crotonaldehyde reaction rectification device is related to.
Background
The catalytic rectification is to introduce the catalyst into the rectifying tower, and the solid catalyst is used as catalyst to speed up chemical reaction and as stuffing or tower inner part to provide mass transfer surface. Because of the high coupling of the catalytic reaction and the rectification process, reaction products can be continuously removed in the reaction process, so that the catalytic rectification process has the advantages of high selectivity, high production capacity, high yield, low energy consumption, low investment and the like, and is increasingly paid attention to by people, and the research and the application of the catalytic rectification process are increasingly wide. At present, because the diameter of catalyst particles adopted in industry is smaller, the pressure drop in a tower is increased and the flooding is easy to happen when the catalyst particles are directly placed in the tower. Reducing the amount of catalyst added results in too short contact time between the reactants and the catalyst and low catalytic efficiency.
Crotonaldehyde, which is known as crotonaldehyde and methacrolein, has cis-form, trans-form and two isomers, wherein the commercial crotonaldehyde has a trans-form structure, and the crotonaldehyde is used as an important chemical intermediate product for producing crotonic acid, isobutanol, n-butanol, methoxybutanol and the like, is mainly used for producing sorbic acid, and the consumption of a sorbic acid preservative is gradually increased in the field of food in China.
At present, the industrial production of crotonaldehyde generally adopts two-step production process of liquid phase condensation and dehydration by using acetaldehyde as a raw material, and the chemical reaction process can be represented by the following reaction formula:
2CH3CHO→CH3CH(OH)CH2CHO
CH3CH(OH)CH2CHO→CH3CH＝CHCHO+H2O
the solid alkali is used as the catalyst for the condensation reaction of the acetaldehyde, so that the defects of the process when the liquid alkali catalyst is used can be overcome, and the solid catalyst is easy to separate from the reaction product, can be repeatedly used and has very obvious advantages of environment and cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a crotonaldehyde reaction rectifier unit aims at being applied to the crotonaldehyde with catalytic rectification and prepares in.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the crotonaldehyde reaction rectifying device comprises a first reaction rectifying tower, wherein an acetaldehyde reflux device is arranged on the top of the first reaction rectifying tower, a solid-borne catalytic reaction device is arranged at a reaction section in the middle of the first reaction rectifying tower, a butyraldehyde dehydration device is arranged at the bottom of the first reaction rectifying tower, and the butyraldehyde dehydration device is connected with the crotonaldehyde rectifying device.
As a further improvement of the utility model, the package is tied up including the solid catalyst that carries to the solid catalytic reaction device, the package is tied up including the filled tube to the solid catalyst that carries, the filled tube has a plurality ofly, the filled tube is regular polygon post, seamless concatenation between the filled tube, the filled tube outside after the concatenation is equipped with the strapping, the strapping is used for fixed filled tube, space between filled tube and the strapping adopts the padding to fill, be equipped with the solid catalyst in the filled tube, and be used for the fixed mounting of the solid catalyst that carries, mounting and solid catalyst form solid catalysis section in the filled tube, still be equipped with the cavity section in the filled tube.
As a further improvement of the utility model, the immobilized catalysis section is in a rectangular saddle shape which accords with the fluid flow rule.
As a further improvement of the utility model, the solid-borne catalytic reaction device is still including the reservoir that is used for temporary storage reaction liquid, and be used for supporting the supporting shoe that the package was tied up to the solid-borne catalyst, the package is tied up to the solid-borne catalyst and is located in the reservoir, the supporting shoe is located reservoir tank bottom and solid-borne catalyst and is tied up between the package, the package is tied up to the solid-borne catalyst still includes first return tube, be equipped with jet-propelled pipe in the first return tube, jet-propelled union coupling has the air supply pipe that provides the air current for jet-propelled pipe, there is the clearance to form reaction liquid return path between jet-propelled pipe and the first return tube, jet-propelled pipe highly be less than first return tube height, first return tube is a plurality of, first return tube is regular polygon and equipartit.
As a further improvement of the utility model, the immobilized catalytic reaction device further comprises a flow baffle plate arranged above the immobilized catalyst bundling bag, and the flow baffle plate is provided with an air hole for air flow to pass through.
As a further improvement of the utility model, the cover is sprayed to this toper that has under the solid-supported catalytic reaction device, the toper is sprayed and is covered and is equipped with the water conservancy diversion hole.
Compared with the prior art, the invention has the beneficial effects that:
1. the condensation tower, the dehydration tower and the rectification tower are combined into one tower, the production flow is simplified, the production efficiency is improved, the occupied area is reduced, and the production cost is reduced;
2. the hollow section in the filler pipe reduces the thickness of the solid-supported catalyst, the route of acetaldehyde diffusing to the surface of solid-supported catalyst particles outside the solid-supported catalytic section and the route of butyraldehyde diffusing to the outside of the solid-supported catalytic section are short, the diffusion resistance in the solid-supported catalytic section is small, and the utilization rate of the catalyst is high. The outer wall of the packing tube divides the bound package of the immobilized catalyst into smaller reaction units, the structural arrangement of the packing tube increases the gas-liquid mass transfer space of the immobilized catalyst, the products generated by the reaction can be separated in time, the gas-liquid mass transfer efficiency is high, and the reaction is favorably carried out;
3. the mixed liquid obtained by mixing the butyraldehyde obtained by catalytic reaction of the immobilized catalyst and acetaldehyde which has not reacted is accumulated in a liquid storage tank, the mixed liquid flows into an air injection pipe along a reaction liquid backflow passage, gas is injected into the air injection pipe, the mixed liquid is blown and pulled into a liquid film by the gas, the liquid film is broken into liquid drops under the action of surface tension in the process of being lifted by the gas, a gas-liquid mixed flow is sprayed out from a first backflow pipe orifice, the liquid part in the gas-liquid mixed flow returns to the surface of the immobilized catalytic section of the filler pipe under the action of gravity, condensation reaction is carried out again, and the yield of the butyraldehyde is improved.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 is an enlarged view of a portion c of FIG. 1;
FIG. 3 is a schematic perspective view of a catalyst-immobilized binder package;
FIG. 4 is a schematic view of a packing tube configuration;
fig. 5 is a schematic view of a first return pipe structure.
The reference numerals are explained below: 1. a first reactive distillation column; 2. a flow baffle plate; 3. packing the immobilized catalyst; 31. a binding member; 32. a filling-in part; 33. a filler tube; 331. an immobilized catalytic section; 332. a hollow section; 34. a first return pipe; 341. a gas ejector tube; 342. a reaction liquid reflux path; 4. a gas supply pipe; 5. a liquid storage tank; 6. a support block; 7. a conical spray hood; 8. a reservoir space; 9. a second reactive distillation column; 10. a first condenser; 11. a second condenser; 12. a two-position four-way valve; 13. a third return conduit; 14. a wastewater discharge pipe; 15. a crotonaldehyde liquid outlet pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1:
as shown in fig. 1, a crotonaldehyde reaction rectification device comprises a first reaction rectification tower 1, wherein an acetaldehyde reflux device is arranged at the top of the first reaction rectification tower 1, and the acetaldehyde reflux device comprises a first condenser 10, and a first gas pipe and a second reflux pipe which are connected with the top of the first reaction rectification tower 1 and the first condenser 10. An immobilized catalytic reaction device is arranged at the middle reaction section of the first reaction rectifying tower 1, an acetaldehyde liquid inlet pipe (not shown) is arranged at the middle reaction section of the first reaction rectifying tower 1, a butanol aldehyde dehydration device is arranged at the bottom of the first reaction rectifying tower 1, the butanol aldehyde dehydration device comprises a second reaction rectifying tower 9, a liquid storage space 8 is arranged between the immobilized catalytic reaction device and the second reaction rectifying tower 9, a liquid conveying pipe (not shown) is arranged between the liquid storage space 8 and the second reaction rectifying tower 9, and a driving pump (not shown) for driving liquid in the liquid storage space 8 to enter the second reaction rectifying tower 9 is arranged on the liquid conveying pipe. The butanol aldehyde dehydration device also comprises an acid liquor inlet pipe (not shown) arranged on the second reactive distillation tower 9. The butyraldehyde dehydration device is connected with a crotonaldehyde rectification device, the crotonaldehyde rectification device comprises a second condenser 11, a liquid inlet (not shown) and a liquid outlet (not shown) are formed in the second condenser 11, and a second gas conveying pipe is connected between the liquid inlet of the second condenser 11 and the top of the second reaction rectification tower 9. A liquid outlet of the second condenser 11 is connected with a liquid outlet pipe, the liquid outlet pipe is connected with a two-position four-way valve 12, the other three interfaces of the two-position four-way valve 12 are respectively connected with a wastewater discharge pipe 14, a crotonaldehyde liquid outlet pipe 15 and a third return pipe 13, and the other end of the third return pipe 13 is connected with the second reaction rectifying tower 9.
As shown in fig. 1, reactant acetaldehyde enters the immobilized catalytic reaction device from the acetaldehyde liquid inlet pipe, and is subjected to catalytic reaction by an immobilized catalyst in the immobilized catalytic reaction device to generate butyraldehyde, and the butyraldehyde enters the liquid storage space 8 under the action of gravity. Because the boiling point of acetaldehyde is low, acetaldehyde which does not react in time is vaporized and then enters the first condenser 10 through the first gas conveying pipe, acetaldehyde gas is condensed and then becomes liquid, and then the liquid flows back to the immobilized catalytic reaction device through the second return pipe for condensation reaction, so that the waste of acetaldehyde is avoided. The driving pump drives the liquid in the liquid storage space 8 to enter the second reactive distillation tower 9, the acid liquid enters the second reactive distillation tower 9 from the acid liquid inlet pipe, and the crotonaldehyde is generated by dehydrating the butyraldehyde under the action of the acid liquid. And (3) vaporizing the water and the crotonaldehyde, feeding the gaseous water and the gaseous crotonaldehyde into a second condenser 11 through a second gas conveying pipe, separating the condensed liquid in the second condenser 11, controlling a two-position four-way valve 12, discharging a water layer through a wastewater discharge pipe 14, detecting the purity of the crotonaldehyde in an oil layer, controlling the two-position four-way valve 12 if the purity meets the requirement, outputting the oil layer through a crotonaldehyde discharge pipe 15, controlling the two-position four-way valve 12 if the purity does not meet the requirement, and returning the oil layer to the second reactive distillation tower 9 through a third return pipe 13. The structure realizes that the condensation tower, the dehydration tower and the rectification tower are combined into one tower, simplifies the production flow, improves the production efficiency, reduces the occupied area and reduces the production cost.
As a further improvement of the utility model, as shown in fig. 3, the package 3 is tied up including the solid catalyst to the solid catalyst that carries, the package 3 is tied up including the filled tube 33 to the solid catalyst that carries, filled tube 33 has a plurality ofly, filled tube 33 is regular polygon post, seamless concatenation between filled tube 33, filled tube 33 after the concatenation is good is equipped with strapping 31 outward, strapping 31 is used for fixed filled tube 33, space between filled tube 33 and the strapping 31 adopts the packing 32 to fill, the packing 32 is made by waterproof material, be equipped with the solid catalyst in the filled tube 33, and be used for the fixed mounting of solid catalyst, mounting and solid catalyst form solid catalysis section 331 in filled tube 33, still be equipped with cavity section 332 in the filled tube 33. The hollow section 332 in the filler pipe 33 reduces the thickness of the solid-supported catalyst, the path of acetaldehyde diffusing to the surface of solid-supported catalyst particles outside the solid-supported catalyst section 331 and the path of butanol aldehyde diffusing to the outside of the solid-supported catalyst section 331 are short, the diffusion resistance in the solid-supported catalyst section 331 is small, and the catalyst utilization rate is high. The solid-supported catalyst bundling bag 3 is divided into smaller reaction units by the outer wall of the filler pipe 33, the gas-liquid mass transfer space of the solid-supported catalyst is enlarged by the structural arrangement of the filler pipe 33, products generated by the reaction can be separated in time, the gas-liquid mass transfer efficiency is high, and the reaction is facilitated.
As a further improvement of the present invention, as shown in fig. 4, the immobilized catalytic section 331 has a rectangular saddle shape conforming to the fluid flow law. The rectangular saddle-shaped shape of the solid-supported catalytic section 331 limits the specific surface area of the solid-supported catalytic section 331 to the maximum extent, thereby improving the gas-liquid mass transfer efficiency of the solid-supported catalytic section 331.
As a further improvement of the utility model, as shown in figures 1, 2 and 3, 5, the immobilized catalytic reaction device further comprises a liquid storage tank 5 for temporarily storing the reaction liquid, and a supporting block 6 for supporting the immobilized catalyst bundler package 3, the immobilized catalyst bundler package 3 is arranged in the liquid storage tank 5, the supporting block 6 is arranged between the bottom of the liquid storage tank 5 and the immobilized catalyst bundler package 3, the immobilized catalyst bundler package 3 further comprises a first return pipe 34, an air injection pipe 341 is arranged in the first return pipe 34, the air injection pipe 341 is connected with an air supply pipe 4 for providing air flow for the air injection pipe 341, a gap is formed between the air injection pipe 341 and the first return pipe 34 to form a reaction liquid return passage 342, the height of the air injection pipe 341 is lower than the height of the first return pipe 34 and the height of the liquid storage tank 5, the first return pipes 34 are multiple, the first return pipes 34 are regular polygons and are uniformly distributed between the filler pipes 33, and the first return. The mixed liquid obtained by mixing the butyraldehyde obtained by catalytic reaction of the immobilized catalyst and acetaldehyde which has not yet reacted is accumulated in the liquid storage tank 5, the mixed liquid flows into the gas injection pipe 341 along the reaction liquid backflow passage 342 (arrow a direction in fig. 5), gas is injected into the gas injection pipe 341 (arrow b direction in fig. 5), the gas blows and pulls the mixed liquid into a liquid film, the liquid film is broken into liquid drops under the action of surface tension in the process of being lifted by the gas, the gas-liquid mixed flow is sprayed out from the pipe opening of the first backflow pipe 34, the liquid part in the gas-liquid mixed flow returns to the surface of the immobilized catalytic section 331 of the filler pipe 33 under the action of gravity, condensation reaction is carried out again, and the yield of the butyraldehyde is improved.
As a further improvement of the utility model, the immobilized catalytic reaction device further comprises a flow baffle plate 2 arranged above the immobilized catalyst bundling bag 3, and the flow baffle plate 2 is provided with an air hole for air flow to pass through. The gas-liquid mixed flow ejected from the nozzle of the first return pipe 34 contacts the baffle plate 2, and liquid drops in the gas-liquid mixed flow are accumulated into large liquid drops under the action of the baffle plate 2, and the large liquid drops drop on the surface of the immobilized catalysis section 331 of the filler pipe 33 under the action of gravity to carry out condensation reaction again.
As a further improvement of the present invention, as shown in fig. 1, a conical spraying cover 7 is provided under the immobilized catalytic reaction device, and a flow guiding hole (not shown) is provided on the conical spraying cover 7. The liquid overflowing from the liquid storage tank 5 is uniformly dispersed on the solid-supported catalytic reaction device on the next layer or in the liquid storage space 8 through the flow guide holes of the conical spraying cover 7.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (6)
1. The utility model provides a crotonaldehyde reaction rectifier unit, includes first reaction rectifying column (1), its characterized in that first reaction rectifying column (1) top of the tower is equipped with acetaldehyde reflux unit, first reaction rectifying column (1) middle part reaction section is equipped with solid-borne catalytic reaction device, be equipped with butanol aldehyde dewatering device at first reaction rectifying column (1) bottom of the tower, butanol aldehyde dewatering device is connected with crotonaldehyde rectifier unit.
2. The crotonaldehyde reaction and rectification device according to claim 1, wherein the immobilized catalyst reaction device comprises an immobilized catalyst bundle (3), the immobilized catalyst bundle (3) comprises a plurality of packing tubes (33), the packing tubes (33) are regular polygonal columns, the packing tubes (33) are seamlessly spliced, a bundling member (31) is arranged outside the spliced packing tubes (33), the bundling member (31) is used for fixing the packing tubes (33), a gap between the packing tubes (33) and the bundling member (31) is filled with a padding member (32), the packing tubes (33) are internally provided with immobilized catalyst and a fixing member for fixing the immobilized catalyst, and the fixing member and the immobilized catalyst form an immobilized catalyst section (331) in the packing tubes (33), a hollow section (332) is further arranged in the filler pipe (33).
3. The crotonaldehyde reaction and rectification device according to claim 2, wherein the supported catalytic section (331) has a saddle shape conforming to the fluid flow law.
4. The crotonaldehyde reaction and rectification device according to claim 2, wherein the immobilized catalyst reaction device further comprises a liquid storage tank (5) for temporarily storing the reaction liquid, and a support block (6) for supporting the immobilized catalyst bundle package (3), the immobilized catalyst bundle package (3) is disposed in the liquid storage tank (5), the support block (6) is disposed between the bottom of the liquid storage tank (5) and the immobilized catalyst bundle package (3), the immobilized catalyst bundle package (3) further comprises a first return pipe (34), an air injection pipe (341) is disposed in the first return pipe (34), the air injection pipe (341) is connected to an air supply pipe (4) for providing air flow for the air injection pipe (341), a gap is formed between the air injection pipe (341) and the first return pipe (34) to form a reaction liquid return passage (342), and the height of the air injection pipe (341) is lower than that of the first return pipe (34), the number of the first return pipes (34) is multiple, the first return pipes (34) are regular polygons and are uniformly distributed among the filler pipes (33), and the first return pipes (34) are seamlessly spliced with the filler pipes (33).
5. The crotonaldehyde reaction and rectification device according to claim 4, wherein the immobilized catalytic reaction device further comprises a flow baffle plate (2) disposed above the immobilized catalyst bale (3), and the flow baffle plate (2) is provided with air holes for passing air.
6. The crotonaldehyde reaction and rectification device according to claim 1, wherein a conical spraying cover (7) is arranged below the immobilized catalytic reaction device, and the conical spraying cover (7) is provided with flow guide holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920661630.1U CN210030505U (en) | 2019-05-09 | 2019-05-09 | Crotonaldehyde reaction rectification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920661630.1U CN210030505U (en) | 2019-05-09 | 2019-05-09 | Crotonaldehyde reaction rectification device |
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| Publication Number | Publication Date |
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| CN210030505U true CN210030505U (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920661630.1U Expired - Fee Related CN210030505U (en) | 2019-05-09 | 2019-05-09 | Crotonaldehyde reaction rectification device |
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| CN (1) | CN210030505U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112657440A (en) * | 2020-11-16 | 2021-04-16 | 南阳师范学院 | Production equipment and production method of ethyl acetate |
| CN112774232A (en) * | 2020-12-02 | 2021-05-11 | 李桂凤 | Catalytic reactive rectifying tower for carrying out chemical reaction |
-
2019
- 2019-05-09 CN CN201920661630.1U patent/CN210030505U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112657440A (en) * | 2020-11-16 | 2021-04-16 | 南阳师范学院 | Production equipment and production method of ethyl acetate |
| CN112774232A (en) * | 2020-12-02 | 2021-05-11 | 李桂凤 | Catalytic reactive rectifying tower for carrying out chemical reaction |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200207 |