System for reducing DCEC content in CEC product

Abstract

The utility model discloses a system for reducing the content of DCEC in a CEC product, which belongs to the field of chemical equipment and comprises a raw material buffer tank, a CEC reaction kettle, a stripping tower and a flash tank which are connected in sequence, an outlet of the raw material buffer tank is communicated to a raw material gas inlet in the top of the CEC reaction kettle, a bottom product discharge port of the CEC reaction kettle is communicated to a feed port in the upper part of the stripping tower, a tail gas outlet is formed in the top of the stripping tower, and a refined CEC discharge port in the bottom is connected to a refined CEC feed port in the middle of the flash tank through a pump; the CEC reaction kettle is provided with a plurality of ultraviolet lamp sockets, and LED ultraviolet lamp posts are arranged in the ultraviolet lamp sockets. According to the LED ultraviolet lamp, the surface temperature of the ultraviolet lamp during working can be effectively reduced, the situation that the side reaction rate of a raw material EC is increased due to the high temperature of the surface of the ultraviolet lamp is avoided, the content of DCEC in a product is reduced, the subsequent production cost is reduced, and the purity of the product is improved. And the light source stability is relatively high, the service life is relatively long, and the energy consumption and the maintenance cost can be reduced while the illumination intensity is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of chemical equipment, in particular, relate to a system for reducing the content of DCEC in CEC product. BACKGROUND

[0002] In the CEC (chloroethylene carbonate) synthesis process, the product from the CEC reactor often contains a certain amount of DCEC (dichloroethylene carbonate), which will be treated as impurities in the subsequent production process, causing problems such as substandard product purity, and needs to be reduced urgently. In the traditional process, unstable feeding will cause local raw material concentration to be too high, causing side reactions, and the surface temperature of the traditional UV ultraviolet lamp will reach more than 100℃ when working. In order to reduce the generation of DCEC, the irradiation intensity of the ultraviolet lamp is generally reduced to inhibit the side reaction of the reaction raw material EC (ethylene carbonate). However, simply reducing the irradiation intensity of the ultraviolet lamp will prolong the reaction time, resulting in a decrease in the yield of CEC product. Fluctuations in the amount of raw material will cause a decrease in product quality. SUMMARY

[0003] In view of the problems and deficiencies in the prior art, the purpose of the utility model is to provide a system for reducing the content of DCEC in CEC product.

[0004] Based on the above purpose, the utility model adopts the following technical scheme:

[0005] A system for reducing the content of DCEC in CEC product, comprising a raw material buffer tank, a CEC reactor, a stripping tower and a flash tank connected in sequence; the outlet of the raw material buffer tank is connected to the raw material gas inlet at the top of the CEC reactor, the bottom product outlet of the CEC reactor is connected to the upper inlet of the stripping tower, the top of the stripping tower is provided with a tail gas outlet, and the refined CEC outlet at the bottom is connected to the middle refined CEC inlet of the flash tank through a pump; the CEC reactor is provided with a plurality of ultraviolet lamp openings, and an LED ultraviolet lamp column is arranged in each ultraviolet lamp opening.

[0006] Further, the three ultraviolet lamp openings are evenly distributed in the form of an equilateral triangle at the top of the CEC reactor with the raw material gas inlet as the center.

[0007] Further, the CEC reactor is provided with a circulating cooler on the side.

[0008] Further, the CEC reactor is a jacketed reactor, and the two side walls near the top end of the CEC reactor are respectively provided with a circulating steam outlet and a circulating hot water outlet connected with the jacket; the circulating steam inlet and the circulating hot water inlet are arranged on both sides of the bottom outlet of the CEC reactor, the circulating steam outlet is connected to the circulating cooler, and the bottom of the circulating cooler is connected to the circulating steam inlet.

[0009] Further, the raw material buffer tank is connected with an EC storage tank and a chlorine storage tank at the inlet.

[0010] Further, the waste liquid outlet at the bottom of the flash tank is connected with a CEC storage tank, and the CEC product outlet at the top is connected with a waste gas storage tank.

[0011] Further, the stripper is provided with a distributor communicated with the crude CEC inlet, and a defoaming device is arranged above the distributor.

[0012] Compared with the prior art, the application has the following beneficial effects:

[0013] (1) The raw material buffer tank can ensure the sufficient mixing of raw materials and provide stable raw material feeding for the CEC reaction kettle.

[0014] (2) The LED ultraviolet lamp can effectively reduce the surface temperature of the ultraviolet lamp during working, avoid the increase of the side reaction rate of the raw material EC due to the high temperature of the ultraviolet lamp surface, reduce the content of DCEC in the product, reduce the cost of subsequent production, and improve the purity of the product.

[0015] (3) The application has high light source stability and service life, can reduce energy consumption and maintenance cost while ensuring light intensity, and can simplify the design of the heat exchanger due to the reduction of heat release in the reaction kettle, thereby reducing the equipment manufacturing cost and energy consumption, and further improving the economic efficiency and environmental protection performance of the system.

[0016] (4) The application is provided with a stripper to remove chlorine and other gas impurities in the CEC product, reduce the energy consumption of subsequent DCEC impurity removal, and the flash tank can remove DCEC impurities to avoid the high product loss of traditional rectification separation, improve the purity of the final CEC product, and reduce the difficulty and cost of separation BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the electronic-grade isopropyl alcohol purification system of the application.

[0018] Figure 2 is a structural schematic diagram of the CEC reaction kettle.

[0019] In the figure: raw material buffer tank 1; chlorine feed port 101; EC feed port 102; mixed raw material outlet 103; EC storage tank 104; chlorine storage tank 105; CEC reactor 2; raw material gas inlet 201; product outlet 202; circulating steam outlet 203; circulating hot water outlet 204; circulating steam inlet 205; circulating hot water inlet 206; tail gas port 207; first ultraviolet lamp port 211; second ultraviolet lamp port 212; third ultraviolet lamp port 213; circulating cooler 221; stripping tower 3; crude CEC feed port 301; tail gas outlet 302; refined CEC outlet 303; pump 304; flash tank 4; refined CEC inlet 401; CEC product outlet 402; waste liquid outlet 403; CEC storage tank 411; tail gas storage tank 421; waste gas storage tank 431. DETAILED DESCRIPTION

[0020] The utility model will be explained in detail below, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] Embodiment 1

[0022] A system for reducing the content of DCEC in CEC product, comprising raw material buffer tank 1, CEC reactor 2, stripping tower 3, flash tank 4 connected in sequence; wherein the raw material EC in EC storage tank 104 and chlorine in chlorine storage tank 105 enter raw material buffer tank 1 through chlorine feed port 101 and EC feed port 102 on raw material buffer tank 1 respectively, and then enter CEC reactor 2 through the top raw material gas inlet 201 of CEC reactor 2 for reaction.

[0023] The CEC reaction kettle 2 is a jacketed reaction kettle, a raw material inlet 201 is arranged at the top center of the CEC reaction kettle 2, a product outlet 202 is arranged at the bottom center of the CEC reaction kettle 2, a circulating steam outlet 203 and a circulating hot water outlet 204 are arranged on the two side walls of the CEC reaction kettle 2 close to the top, a circulating steam inlet 205 and a circulating hot water inlet 206 are arranged on both sides of the product outlet 202 at the bottom of the CEC reaction kettle 2, a tail gas outlet 207 is arranged at the top of the CEC reaction kettle 2 close to the raw material inlet 101, and the first ultraviolet lamp port 211, the second ultraviolet lamp port 212 and the third ultraviolet lamp port 213 are evenly distributed in the form of an equilateral triangle with the raw material inlet 201 as the center. The three LED ultraviolet lamp columns are evenly distributed in the form of an equilateral triangle, which can ensure sufficient coverage and uniformity of illumination. This layout can maximize the utilization efficiency of the light source, avoid the problem of product unqualified caused by local shadow or insufficient illumination, and thus improve the operation stability of the production process. Since the LED ultraviolet lamp generates less heat, the cooling demand in the system is greatly reduced, thereby the size and complexity of the heat exchanger can be reduced, the equipment manufacturing cost and operation energy consumption are reduced; therefore, a circulating cooler 221 is arranged on the side of the CEC reaction kettle 2.

[0024] The bottom of the CEC reaction kettle 2 is connected to the crude CEC inlet 301 of the upper part of the stripping tower 3 through the product outlet 202, the refined CEC outlet 303 at the bottom of the stripping tower 3 is connected to the middle refined CEC inlet 401 of the flash tank 4 through the pump 304, and the tail gas outlet 302 at the top is connected to the tail gas storage tank 421. The stripping tower 3 can remove chlorine and other gas impurities in the CEC product, thereby reducing the energy consumption of subsequent removal of DCEC impurities; the flash tank 4 can remove DCEC impurities. The waste liquid outlet 403 at the bottom of the flash tank 4 is connected to the CEC storage tank 411, and the CEC product outlet 402 at the top is connected to the waste gas storage tank 431. The crude product discharged from the CEC reaction kettle 2 is separated twice by the stripping tower 3 and the flash tank 4 to obtain the CEC product.

[0025] The first ultraviolet lamp port 211, the second ultraviolet lamp port 212 and the third ultraviolet lamp port 213 are all installed with LED ultraviolet lamps, the LED ultraviolet lamps have high light source stability and service life, can effectively reduce the maintenance cost and energy consumption while ensuring the illumination intensity, reduce the risk of overheating in system operation, improve the efficiency of the whole system, and are conducive to the safe operation of the system; at the same time, the LED ultraviolet lamps do not contain harmful substances such as mercury, are more friendly to the environment, and meet the environmental protection requirements.

[0026] Although the description of the utility model is combined with above specific embodiment, but, personnel familiar with this technical field can carry out many substitutions, modification and change according to the above content, it is obvious. Therefore, all such alternatives, improvements and changes should belong to the protection scope of the utility model claim.

Claims

1. A system for reducing the DCEC content of a CEC product, characterized by, The device comprises a raw material buffer tank, a CEC reactor, a stripping tower and a flash tank connected in sequence; the outlet of the raw material buffer tank is connected to the raw material gas inlet at the top of the CEC reactor; the bottom product outlet of the CEC reactor is connected to the upper feed inlet of the stripping tower; the stripping tower is provided with a tail gas outlet at the top and a refined CEC outlet at the bottom; the refined CEC outlet is connected to the middle refined CEC inlet of the flash tank through a pump; the CEC reactor is provided with multiple UV lamp ports, and each UV lamp port is provided with an LED UV lamp column.

2. The system for reducing the DCEC content of a CEC product of claim 1, wherein, The three UV lamp ports are uniformly distributed on the top of the CEC reactor in the form of an equilateral triangle with the raw material gas inlet as the center.

3. The system for reducing the DCEC content of a CEC product of claim 2, wherein, The CEC reactor is provided with a circulating cooler on the side.

4. The system for reducing the DCEC content of a CEC product of claim 3, wherein, The CEC reactor is a jacketed reactor, and the two side walls near the top of the CEC reactor are respectively provided with a circulating steam outlet and a circulating hot water outlet connected with the jacket; the circulating steam inlet and the circulating hot water inlet are arranged on the two sides of the bottom outlet of the CEC reactor; the circulating steam outlet is connected to the circulating cooler, and the bottom of the circulating cooler is connected to the circulating steam inlet.

5. The system for reducing the DCEC content of a CEC product of claim 4, wherein, The raw material buffer tank is connected with an EC storage tank and a chlorine storage tank at the inlet.

6. The system for reducing the DCEC content of a CEC product of claim 5, wherein, The waste liquid outlet at the bottom of the flash tank is connected with a CEC storage tank, and the CEC product outlet at the top is connected with a waste gas storage tank.

7. The system for reducing the DCEC content of a CEC product of claim 6, wherein, The stripping tower is provided with a distributor connected with the crude CEC inlet, and a defoamer is arranged above the distributor.

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