Tubular reactor for producing 3, 4-dihydroxy-1-butene
By introducing MVR cyclic heating and steam separator into the tubular reactor system, the problem of temperature gradient and micro bubbles affecting the reaction efficiency in the tubular reactor is solved, and more efficient catalytic reactions and energy utilization are achieved.
Patent Information
- Application Number
- CN202420554227.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-03-21
AI Technical Summary
There are problems in the heating and reaction process of existing tubular reactors that temperature gradients and microbubbles affect the reaction efficiency.
A system including a heat exchanger, a soda separator, a tubular reactor, and a MVR heat pump was designed. The circulating heating was carried out through MVR technology, and the micro bubbles were separated by a soda separator to increase the contact area between the catalyst and the reactants.
Through cyclic heating and microbubble separation, the catalytic reaction rate is significantly improved, energy consumption is reduced, and reaction efficiency is improved.
Smart Images
Figure CN222969836U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a tubular reactor for the production of 3,4-dihydroxy-1-butene. Background Technique
[0002] 3,4-Dihydroxy-1-butene (commonly known as 3,4-butenediol) is an important synthetic raw material for the lithium-ion battery additive vinyl ethylene carbonate. It is mainly obtained by the rearrangement of 1,4-butenediol under the catalysis of a catalyst through an isomerization reaction. In order to improve the reaction efficiency and increase the conversion rate, many manufacturers now try to use a tubular reactor for synthesis, but there are also the following disadvantages. On the one hand, it is heated to the reaction temperature before entering the tubular reactor, and since the tubular reactor is relatively long, its temperature will gradually decrease, affecting the reaction efficiency. Secondly, tiny steam bubbles will be generated inside the hot 1,4-butenediol, and these bubbles will affect the contact area with the carrier and the catalyst, thus affecting the conversion rate to a certain extent. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a tubular reactor for the production of 3,4-dihydroxy-1-butene to solve the technical problems in the background technique.
[0004] To solve the above technical problems, the technical solution of the utility model is as follows:
[0005] A tubular reactor for the production of 3,4-dihydroxy-1-butene includes a heat exchanger, a steam-water separator A, a tubular reactor, a steam-water separator B, and an MVR heat pump; the steam outlet of the heat exchanger is connected to the steam inlet of the tubular reactor through a gas transmission pipe, and the steam outlet of the tubular reactor is connected to the steam inlet of the heat exchanger through a circulation pipe; an MVR heat pump is installed in series on the circulation pipe, a steam-water separator B is installed before the inlet of the MVR heat pump and a starting steam inlet is provided; the liquid outlet of the heat exchanger is connected to the liquid inlet of the steam-water separator A, the exhaust port at the top of the steam-water separator A is connected to the gas transmission pipe, and the drain port at the bottom is connected to the liquid inlet of the tubular reactor.
[0006] Further, the heat exchanger internally has a heating coil, and the tubular reactor internally has a reaction coil. Catalyst carriers are arranged at intervals inside the reaction coil, and the diameter of the reaction coil is larger than that of the heating coil.
[0007] Further, the diameter of the reaction coil is 3-5 times that of the heating coil.
[0008] Further, a temperature sensor is installed before the liquid inlet of the tubular reactor, and the temperature sensor is connected to a temperature display.
[0009] The advantages of the utility model are as follows:
[0010] (1) By circulating heating through MVR technology, the latent heat is fully utilized, greatly reducing energy consumption. At the same time, the heat exchanger is used to quickly raise the temperature, and then the subsequent steam enters the internal of the tubular reactor for heat preservation reaction, which can improve the catalytic reaction rate;
[0011] (2) The setting of the steam-water separator A can separate the steam in the high-temperature solution. On the one hand, the latent heat is recovered, and on the other hand, the microbubbles in the high-temperature solution are separated out, so that it can better contact and react with the catalyst carrier inside the tubular reactor, improving the reaction efficiency. Description of the Drawings
[0012] Figure 1 It is a schematic structural diagram of the present utility model.
[0013] In the figure, 1 - heat exchanger, 11 - heating coil, 2 - steam-water separator A, 3 - tubular reactor, 31 - reaction coil, 311 - catalyst carrier, 4 - steam-water separator B, 5 - MVR heat pump, 6 - gas transmission pipe, 7 - circulation pipe, 8 - temperature sensor, 81 - temperature display. Detailed Embodiments
[0014] The following further describes the detailed embodiments of the present utility model with reference to the drawings. It should be noted here that the description of these embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.
[0015] As shown in the figure:
[0016] A tubular reactor 3 for the production of 3,4-dihydroxy-1-butene includes a heat exchanger 1, a steam-water separator A 2, a tubular reactor 3, a steam-water separator B 4, and an MVR heat pump 5; the steam outlet of the heat exchanger 1 is connected to the steam inlet of the tubular reactor 3 through a gas transmission pipe 6, and the steam outlet of the tubular reactor 3 is connected to the steam inlet of the heat exchanger 1 through a circulation pipe 7; an MVR heat pump 5 is installed in series on the circulation pipe 7, and a steam-water separator B 4 and a starting steam inlet are installed in front of the inlet of the MVR heat pump 5; the liquid outlet of the heat exchanger 1 is connected to the liquid inlet of the steam-water separator A 2, the exhaust port at the top of the steam-water separator A 2 is connected to the gas transmission pipe 6, and the drain port at the bottom is connected to the liquid inlet of the tubular reactor 3.
[0017] Working Principle:
[0018] This utility model provides heat circulation for the whole based on MVR (Mechanical Vapor Recompression) technology. Before the reaction, external steam source is injected into the system from the start steam inlet, and then compressed and circulated by the MVR heat pump 5. The high-temperature steam on the outlet side enters the heat exchanger 1, thereby raising the temperature of the 1,4-butanediol solution passing through the inside, making it quickly rise to the temperature at which catalytic reaction can occur. After that, the steam of the heat exchanger 1 enters the tubular reactor 3 through the gas pipeline 6, thus playing a role in heat preservation. The heated 1,4-butanediol first enters the steam-water separator A2, where the generated steam is separated. The generated secondary steam enters the gas pipeline 6 and then enters the steam pipeline to supplement the cycle, while the separated 1,4-butanediol enters the tubular reactor 3 for catalytic reaction.
[0019] As an optimized solution, the heat exchanger 1 has a heating coil 11 inside, and the tubular reactor 3 has a reaction coil 31 inside. The catalyst carriers 311 are arranged at intervals inside the reaction coil 31 (the catalyst carriers 311 can be selected as nickel foam metal, on which rhenium oxide or cuprous chloride is combined as the catalyst). The diameter of the reaction coil 31 is larger than that of the heating coil 11, and the diameter of the reaction coil 31 is 3 - 5 times that of the heating coil 11. In this way, the area will be increased by 9 - 25 times. The heating coil 11 is connected to the reaction coil 31, and the flow rate is the same. Therefore, the flow velocity will correspondingly decrease to 1 / 25 - 1 / 9 of the original.
[0020] The advantage of such a design is that it can reduce the diameter of the heating coil 11, which is beneficial to heat exchange and enables rapid temperature rise. In order to ensure the catalytic reaction rate, it is necessary to ensure the time of the catalytic reaction. This can be achieved by increasing the diameter of the reaction coil 31 to make it in a slow-flow state, so as to carry out the catalytic reaction for a sufficient time in the tubular reactor 3.
[0021] Since the optimal time interval of the catalytic reaction is determined, when the diameter and length of the reaction coil 31 and the diameter and length of the heating coil 11 are determined, the flow velocity interval in the heating coil 11 is determined, that is, the heat exchange time of 1,4-butanediol in the heat exchanger 1 is basically determined and has little fluctuation. However, the whole system is affected by the external environment, and the heat preservation ability fluctuates. For example, the heat dissipation is strong in winter and weak in summer. Therefore, a temperature sensor 8 can be installed in front of the liquid inlet of the tubular reactor 3, and the temperature sensor 8 is connected to the temperature display 81. In this way, the temperature of the 1,4-butanediol entering the tubular reactor 3 can be grasped to see whether the heating reaches the optimal reaction temperature interval. If the temperature is low, the power of the MVR heat pump 5 can be increased.
[0022] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present utility model, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present utility model.
Claims
1. A tubular reactor for producing 3,4-dihydroxy-1-butene, characterized in that: It comprises a heat exchanger, a steam-water separator A, a tubular reactor, a steam-water separator B and an MVR heat pump; the steam outlet of the heat exchanger is connected to the steam inlet of the tubular reactor through a gas pipeline, and the steam outlet of the tubular reactor is connected to the steam inlet of the heat exchanger through a circulation pipe; the MVR heat pump is installed in series on the circulation pipe, and a steam-water separator B and a start-up steam inlet are installed in front of the inlet of the MVR heat pump; the liquid outlet of the heat exchanger is connected to the liquid inlet of the steam-water separator A, the top exhaust port of the steam-water separator A is connected to the gas pipeline, and the bottom drain port is connected to the liquid inlet of the tubular reactor.
2. The tubular reactor for producing 3,4-dihydroxy-1-butene according to claim 1, characterized in that: The heat exchanger has a heating coil inside, and the tubular reactor has a reaction coil inside. Catalyst carriers are arranged at intervals inside the reaction coil. The diameter of the reaction coil is larger than that of the heating coil.
3. The tubular reactor for producing 3,4-dihydroxy-1-butene according to claim 2, characterized in that: The diameter of the reaction coil is 3-5 times that of the heating coil.
4. The tubular reactor for producing 3,4-dihydroxy-1-butene according to claim 1, characterized in that: A temperature sensor is installed in front of the liquid inlet of the tubular reactor, and the temperature sensor is connected to a temperature display.