CN217120192U - No-polycondensation furfural feeding system - Google Patents
No-polycondensation furfural feeding system Download PDFInfo
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- CN217120192U CN217120192U CN202220523484.8U CN202220523484U CN217120192U CN 217120192 U CN217120192 U CN 217120192U CN 202220523484 U CN202220523484 U CN 202220523484U CN 217120192 U CN217120192 U CN 217120192U
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Abstract
The utility model belongs to a furfural feeding system without polycondensation; the system comprises a hydrogen storage tank and a furfural storage tank, wherein the hydrogen storage tank and the furfural storage tank are respectively connected with a vacuum vaporization unit, and the vacuum vaporization unit is sequentially connected with a hydrogenation reaction unit, a heat recovery unit, a rectification unit and a product tank through an aldehyde gas pressurizing and heating unit; the furfural vaporization temperature reduction device has the advantages of being simple in structure, reasonable in design, capable of effectively reducing the furfural vaporization temperature through the vacuum pump and the vacuum vaporizer, capable of reducing the load of the preheater and capable of preventing the polycondensation phenomenon.
Description
Technical Field
The utility model belongs to a furfural charge-in system of no polycondensation.
Background
Furfural is an important chemical raw material, and furfural can be used for producing hydrogenation products such as furfuryl alcohol, tetrahydrofurfuryl alcohol, 2-methylfuran, 2-methyltetrahydrofuran and the like through catalytic hydrogenation. The furfural catalytic hydrogenation process is divided into a liquid phase hydrogenation process and a gas phase hydrogenation process, the furfural raw material needs to be preheated to the reaction temperature, the higher the furfural temperature is, the higher the degree of self-polycondensation is, and the adverse aspects of furfural polycondensation are as follows: the selectivity of raw materials is reduced, and the obtained effective products are reduced; the boiling point of the second furfural polycondensate is higher, so that the product is more difficult to separate and the steam consumption is higher; the third furfural polycondensation can reduce the heat transfer effect of the furfural preheater and even block a heat exchange tube of the furfural preheater; the fourth furfural polycondensate enters the catalytic bed layer, so that the catalyst is coked, and the service life of the catalyst is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's defect, and provide a simple structure, reasonable in design, through the use of vacuum pump and cooperation vacuum vaporizer can effectual reduction furfural vaporization temperature, not only can reduce furfural preheater's load, can also prevent the furfural charge-in system of no polycondensation that the polycondensation phenomenon produced.
The purpose of the utility model is realized like this:
the utility model provides a no condensation polymerization's furfural charge-in system, includes hydrogen storage tank and furfural storage tank, hydrogen storage tank and furfural storage tank link to each other respectively in vacuum vaporization unit, and vacuum vaporization unit passes through aldehyde gas pressure heating unit in proper order with hydrogenation unit, heat recovery unit, rectification unit and product jar.
Preferably, the vacuum vaporization unit comprises a vacuum vaporizer connected with the hydrogen storage tank and the furfural storage tank respectively, a top gas-phase outlet of the vacuum vaporizer is connected with the buffer tank, and a gas-phase outlet of the buffer tank is connected with the aldehyde gas preheater in the aldehyde gas pressurizing and heating unit through a vacuum pump.
Preferably, the bottom of the vacuum vaporizer and the upper paper part of the vacuum vaporizer are provided with a circulating pipeline communicated with the vacuum vaporizer, the circulating pipeline at the bottom of the vacuum vaporizer is provided with a circulating pump, and a furfural preheater is arranged on the circulating pipeline between the circulating pump and the upper part of the vacuum vaporizer.
Preferably, a liquid phase outlet at the bottom of the buffer tank is connected with a circulating pipeline close to one side of the upper part of the vacuum vaporizer through a furfural pump.
Preferably, the vacuum pump is connected with a circulating water inlet pipeline and a circulating water return pipeline of a public work.
Preferably, the aldehyde gas pressurizing and heating unit comprises an aldehyde gas preheater, and the aldehyde gas preheater is connected with the aldehyde gas superheater through an aldehyde gas compressor.
Preferably, a hydrogen preheater is arranged between the hydrogen storage tank and the vacuum vaporizer in the vacuum vaporization unit.
The furfural feeding system without polycondensation is mainly suitable for feeding in the process of hydrogenation reaction by a gas phase method, can reduce the vaporization temperature of furfural by using a vacuum vaporization unit so as to avoid furfural polycondensation, is provided with an aldehyde gas pressurizing and heating unit on the basis, and preheats, pressurizes and heats aldehyde gas so as to meet the requirement of hydrogenation reaction; furthermore, the utility model can heat the furfural by arranging the circulating pipeline to achieve the purpose of accelerating the vaporization of the furfural, and on the basis, the liquid phase outlet at the bottom of the buffer tank is connected with the circulating pipeline, so that the heated furfural heats the liquid phase flowing out of the buffer tank, thereby realizing the characteristic of improving the vaporization efficiency; meanwhile, the circulation pipeline arranged at the lower part of the vacuum vaporizer can increase the circulation amount of the furfural, and further realize the purpose of reducing the outlet temperature of the furfural preheater; the furfural vaporization temperature reduction device has the advantages of being simple in structure, reasonable in design, capable of effectively reducing the furfural vaporization temperature through the vacuum pump and the vacuum vaporizer, capable of reducing the load of the preheater and capable of preventing the polycondensation phenomenon.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout. For the sake of simplicity, only the parts relevant to the invention are schematically shown in the drawings, and they do not represent the actual structure as a product.
As shown in figure 1, the utility model relates to a no condensation polymerization's furfural charge-in system, including hydrogen storage tank 1 and furfural storage tank 3, hydrogen storage tank 1 and furfural storage tank 3 link to each other in the vacuum vaporization unit respectively, and the vacuum vaporization unit passes through aldehyde gas pressurization heating unit and in proper order with hydrogenation unit 14, heat recovery unit 15, rectification unit 16 and product jar 17.
Further, the vacuum vaporization unit comprises a vacuum vaporizer 4 respectively connected with the hydrogen storage tank 1 and the furfural storage tank 3, a top gas-phase outlet of the vacuum vaporizer 4 is connected with a buffer tank 7, and a gas-phase outlet of the buffer tank 7 is connected with an aldehyde gas preheater 12 in the aldehyde gas pressurizing and heating unit through a vacuum pump 9.
Furthermore, a circulating pipeline 19 communicated with the vacuum vaporizer 4 is arranged on the paper piece at the bottom of the vacuum vaporizer 4 and on the upper part of the vacuum vaporizer 4, a circulating pump 5 is arranged on the circulating pipeline 19 at the bottom of the vacuum vaporizer 4, and a furfural preheater 6 is arranged on the circulating pipeline 19 between the circulating pump 5 and the upper part of the vacuum vaporizer 4.
Further, a liquid phase outlet at the bottom of the buffer tank 7 is connected with a circulating pipeline 19 close to one side of the upper part of the vacuum vaporizer 4 through a furfural pump 8.
Further, the vacuum pump 9 is connected with a circulating water inlet pipe 10 and a circulating water return pipe 11 of a public work.
Further, the aldehyde gas pressurizing and heating unit comprises an aldehyde gas preheater 12, and the aldehyde gas preheater 12 is connected with the aldehyde gas superheater 18 through an aldehyde gas compressor 13.
Further, a hydrogen preheater 2 is arranged between the hydrogen storage tank 1 and a vacuum vaporizer 4 in the vacuum vaporization unit.
The utility model also provides a method of furfural charge-in system of no polycondensation, it includes following step:
the method comprises the following steps: the hydrogen in the hydrogen storage tank 1 is heated by the hydrogen preheater 2 and enters the vacuum vaporizer 4, and the furfural in the furfural storage tank 3 also enters the vacuum vaporizer 4; the outlet hydrogen temperature of the hydrogen preheater 2 is 100-140 ℃; the preheating form in the hydrogen preheater 2 can be, but is not limited to, steam heating, electric heating, plant process heat, or the like; the furfural in the furfural storage tank 3 is at normal temperature, and the hydrogen: the molar ratio of the furfural is 5-25: 1. The vacuum in the vacuum vaporizer 4 is 45-75 kpa.
Step two: a circulating pipeline 19 is arranged at the lower part of the vacuum vaporizer 4, a circulating pump 5 and furfural are arranged on the circulating pipeline 19 and pass through a furfural preheater 6, and the furfural pumped out by the working of the circulating pump 5 is preheated by the furfural preheater 6 and enters the top of the vacuum vaporizer 4; preferably, the circulation flow of the circulation pump 5 is 5-15 times of the furfural feeding amount; the temperature of the process gas at the top gas phase outlet of the vacuum vaporizer 4 is 50-75 ℃.
Step three: the process gas discharged from the gas phase outlet at the top of the vacuum vaporizer 4 enters a buffer tank 7, liquid drops carried in the process gas are collected by the buffer tank 7, and then the liquid drops are sent to a circulating pipeline 19 from a furfural pump 8 to be mixed with preheated aldehyde gas for heat exchange and then return to the vacuum vaporizer 4 for vaporization;
step four: the vacuum pump 9 carries out vacuum pumping treatment on the buffer tank 7, the vacuum pump 9 is connected with a circulating water inlet pipeline 10 and a circulating water return pipeline 11 of a public work, the temperature of circulating water inlet in the circulating water inlet pipeline 10 is 15-32 ℃, and the temperature of circulating water return in the circulating water return pipeline 11 is as follows: 30-42 ℃;
step five: the process gas passing through the vacuum pump 9 enters an aldehyde gas preheater 12 for preheating and then enters an aldehyde gas compressor 13 for boosting, and then enters an aldehyde gas superheater 18 for reaching the temperature and pressure required by the reaction; the temperature of the process gas at the outlet of the aldehyde gas preheater 12 is as follows: 93-120 ℃, and the temperature of the process gas at the outlet of the aldehyde gas superheater 18 is as follows: 120 ℃ and 180 ℃.
Step six: the process gas passing through the aldehyde gas superheater 18 sequentially passes through the hydrogenation reaction unit 14, the heat recovery unit 15 and the rectification unit 16 and enters the product tank 17. The hydrogenation unit 14 of the present invention includes, but is not limited to, hydrogenation reactors, catalysts, steam drums, and other devices and apparatuses. The heat recovery unit 15 includes, but is not limited to, a gas-to-gas heat exchanger, a circulating water cooler, a chilled water cooler, and the like. The rectification unit 16 includes, but is not limited to, intermediate storage tanks, rectification columns, condensers, reboilers, and the like.
Through the utility model discloses an above-mentioned method can effectively reduce the temperature of 4 top gaseous phase outlet process gases of vacuum vaporizer, compares outlet temperature with conventional vaporizer and reduces 25-50 ℃ to reduced furfural polycondensation and made ton hydrogenation products's furfural consumption reduce 0.1-0.5%, the life of catalyst has increased 1/10-1/3, and the total steam consumption of technology reduces 3% -10%, and the washing degree of difficulty of furfural preheater reduces, life cycle extension 6-12 months. As is known, furfural is a thermosensitive raw material, and is subjected to polycondensation when the temperature is higher than 90 ℃, and is changed into black tar after long-term accumulation, and the black tar is attached to the inner walls of equipment and pipelines, so that the risk of blockage is caused, the heat exchange efficiency of a heat exchanger is reduced, and the steam consumption of a furfural preheater is increased; and the utility model discloses a set up vacuum vaporizer 4 and vacuum pump 9 and build certain vacuum, reduced raw materials furfural's boiling point to make furfural gasify under the lower temperature, reduce the furfural polycondensation, aldehyde gas preheater 12 and aldehyde gas over heater 18 later all heat furfural gas, the polycondensation phenomenon can not appear. The aldehyde gas preheater 12 heats the aldehyde gas to prevent the aldehyde gas from pressurizing and separating out liquid; the aldehyde gas superheater 18 heats the aldehyde gas to reach the feed temperature required by the reaction. The furfural preheater 6, the aldehyde gas preheater 12 and the aldehyde gas superheater 18 are used for reasonably distributing heat sources at each stage under the combined action of progressive and progressive layers, so that furfural polycondensation caused by overhigh local temperature is avoided.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "connecting," and the like are to be construed broadly, and may, for example, be fixedly connected, integrally connected, or detachably connected; or communication between the interior of the two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations. The above examples are merely illustrative of the feasible embodiments of the present invention and they are not intended to limit the scope of the present invention, and equivalent embodiments, modifications and alterations without departing from the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. A no condensation polymerization's furfural charge-in system, includes hydrogen storage tank (1) and furfural storage tank (3), its characterized in that: the hydrogen storage tank (1) and the furfural storage tank (3) are respectively connected with a vacuum vaporization unit, and the vacuum vaporization unit is sequentially connected with the hydrogenation reaction unit (14), the heat recovery unit (15), the rectification unit (16) and the product tank (17) through an aldehyde gas pressurizing and heating unit.
2. The polycondensation-free furfural feed system of claim 1 wherein: the vacuum vaporization unit comprises a vacuum vaporizer (4) which is respectively connected with a hydrogen storage tank (1) and a furfural storage tank (3), a top gas-phase outlet of the vacuum vaporizer (4) is connected with a buffer tank (7), and a gas-phase outlet of the buffer tank (7) is connected with an aldehyde gas preheater (12) in the aldehyde gas pressurizing and heating unit through a vacuum pump (9).
3. A polycondensation-free furfural feed system according to claim 2, wherein: the bottom of the vacuum vaporizer (4) and the paper piece on the upper part of the vacuum vaporizer (4) are provided with a circulating pipeline (19) communicated with the vacuum vaporizer (4), the circulating pipeline (19) at the bottom of the vacuum vaporizer (4) is provided with a circulating pump (5), and a furfural preheater (6) is arranged on the circulating pipeline (19) between the circulating pump (5) and the upper part of the vacuum vaporizer (4).
4. A polycondensation-free furfural feed system according to claim 3, wherein: and a liquid phase outlet at the bottom of the buffer tank (7) is connected with a circulating pipeline (19) close to one side of the upper part of the vacuum vaporizer (4) through a furfural pump (8).
5. A polycondensation-free furfural feed system according to claim 2, wherein: and the vacuum pump (9) is connected with a circulating water inlet pipeline (10) and a circulating water return pipeline (11) of a public project.
6. A polycondensation-free furfural feed system according to claim 1 or 2, characterized in that: the aldehyde gas pressurizing and heating unit comprises an aldehyde gas preheater (12), and the aldehyde gas preheater (12) is connected with an aldehyde gas superheater (18) through an aldehyde gas compressor (13).
7. A polycondensation-free furfural feed system according to claim 2, wherein: and a hydrogen preheater (2) is arranged between the hydrogen storage tank (1) and a vacuum vaporizer (4) in the vacuum vaporization unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220523484.8U CN217120192U (en) | 2022-03-10 | 2022-03-10 | No-polycondensation furfural feeding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220523484.8U CN217120192U (en) | 2022-03-10 | 2022-03-10 | No-polycondensation furfural feeding system |
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| CN217120192U true CN217120192U (en) | 2022-08-05 |
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| CN202220523484.8U Active CN217120192U (en) | 2022-03-10 | 2022-03-10 | No-polycondensation furfural feeding system |
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