Photochlorination reactor for continuously producing polychloroethane

Abstract

The photochlorination reactor is characterized in that the photochlorination reactor comprises a shell, a tower reactor and a light source, the tower reactor and the light source are installed in the shell, a liquid raw material inlet is formed in the upper portion of the tower reactor, an upper end outlet and a lower end outlet are formed in the upper end and the lower end of the tower reactor respectively, and the lower end outlet is connected with a rear reactor inlet; an outlet of the rear reactor is connected with a product storage tank, an air inlet is formed in the upper part of the rear reactor, and the tower reactor and the rear reactor are transparent and are filled with glass spring filler. The device disclosed by the utility model has the advantages of shorter reaction retention time, less by-products, high conversion rate, low later rectification cost, better gas-liquid dispersion effect, high chlorine utilization rate, energy conservation, improvement of gas-liquid reaction efficiency and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chemical equipment field especially relates to a continuous production polychloroethane photochlorination reactor. BACKGROUND

[0002] Chlorination is widely used in chemical field, and the chlorination refers to the reaction of substituting chlorine atom for hydrogen atom in organic compound, which is mainly divided into thermal chlorination, photochlorination, catalytic chlorination and the like, wherein the photochlorination is to generate chlorine free radical by exciting Cl2 with light, and then reacts with hydrocarbon molecules to generate chlorine-containing compound. Chinese patent CN103936548A discloses a reaction distillation integrated device mainly composed of a rectifying tower and a side reactor, which takes 1,2-dichloroethane and chlorine gas as raw materials, and directly feeds the 1,2-dichloroethane into the first side reactor coupled with the rectifying tower, and continuously feeds the chlorine gas into each side reactor connected with the rectifying tower, and the chlorination reaction occurs in the first side reactor under the photo-catalytic condition, and the liquid phase material obtained by the reaction in the side reactor enters the rectifying tower, and the required product is obtained from the tower kettle; or when the side reactor is more than two, the liquid phase material of the rectifying tower is extracted and then enters the next side reactor for chlorination reaction, and then returns to the next tower plate for extraction, and the required product is obtained from the tower kettle. The side reactor adopts a kettle type reactor, the reaction residence time is long, the by-products are many, the raw materials need to be returned in the continuous reaction, and the distillation cost is high. CONTENT

[0003] In view of the deficiencies and defects in the prior art, the utility model provides a continuous production polychloroethane photochlorination reactor, which has short reaction residence time of reactants, few by-products, no need of returning reaction raw materials, high conversion rate, and can reduce the cost of later distillation.

[0004] To achieve the above object, the utility model takes the technical scheme that:

[0005] A continuous production polychloroethane photochlorination reactor, comprising a shell, a tower type reactor and a light source installed in the shell, wherein the upper part of the tower type reactor is provided with a liquid raw material inlet, the upper end and the lower end are respectively provided with an upper end outlet and a lower end outlet, the lower end outlet is connected with the inlet of a rear reactor, the outlet of the rear reactor is connected with a product storage tank, the upper part of the rear reactor is provided with an air inlet, and the tower type reactor and the rear reactor are transparent and internally filled with glass spring packing.

[0006] The light source is arranged in the middle, and a plurality of tower type reactors are arranged in a ring array around the light source.

[0007] The light source is an ultraviolet lamp, and a cooling quartz cover is arranged outside the ultraviolet lamp.

[0008] The upper end outlet of the tower type reactor is connected with a condenser, and the upper end of the condenser is connected with a hydrogen chloride gas outlet.

[0009] The shell comprises an inner shell and an outer shell, and cooling circulating water is introduced between the inner shell and the outer shell.

[0010] The upper and lower ends of the shell are connected with an upper cover and a lower cover respectively, the upper cover is provided with a light source mounting hole in the center and is provided with reactor mounting holes A around, the lower cover is provided with reactor mounting holes B at the corresponding positions, the tower type reactor passes through the reactor mounting holes A and the reactor mounting holes B at the upper and lower ends and is detachably connected with the upper cover and the lower cover, and the light source enters the shell from the light source mounting hole.

[0011] The beneficial effects of the utility model are: (1) the tower type reactor is adopted, the reaction residence time is shorter, and by-products are less; (2) the reactants continuously react in the reactor, the reaction raw materials are not back mixed, the conversion rate is high, and the cost of later rectification is low; (3) the tower type reactor and the post reactor are filled with glass spring fillers, the gas-liquid dispersion effect is better, and the utilization rate of chlorine is higher than that of the kettle type stirring reactor; (4) the same light source corresponds to multiple sets of the same tower type reactor, energy is saved, and the efficiency of gas-liquid reaction is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0013] Figure 1 It is a structure schematic view of the continuous production polychloroethane photochlorination reactor of the utility model.

[0014] Figure 2 It is a sectional view of Figure 1 .

[0015] Figure 3 It is an enlarged view of A in Figure 1 .

[0016] Figure 4 It is an enlarged view of B in Figure 1 .

[0017] Figure 5 It is an enlarged view of C in Figure 1 .

[0018] Figure 6 It is a distribution schematic view of the reactor mounting hole A and the light source mounting hole on the upper cover.

[0019] Figure 7 It is a distribution schematic view of the reactor mounting hole B on the lower cover.

[0020] In the figure: 1 condenser, 2 tower reactor, 21 liquid raw material inlet, 22 upper end outlet, 23 lower end outlet, 24 packing support plate, 3 light source, 4 shell, 5 upper cover, 51 reactor mounting hole A, 52 light source mounting hole, 6 lower cover, 61 reactor mounting hole B, 7 rear reactor, 71 air inlet, 72 packing support plate, 8 product storage tank, 81 product outlet, 9 hydrogen chloride gas outlet, 10 connecting sleeve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] In the description of the present application, it also needs to be explained that, unless explicitly specified and limited, if the terms "arrange", "mount", "connect", "connect" appear, they should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Reference Figures 1-4 The utility model discloses a continuous production polychloroethane photochlorination reactor, including shell 4 and install in the tower reactor 2 and light source 3 of shell 4, the upper portion of tower reactor 2 is equipped with liquid raw material inlet 21, and the upper end and lower end are equipped with upper end outlet 22 and lower end outlet 23 respectively, and the lower end outlet 23 is connected with the inlet of rear reactor 7, and the outlet of rear reactor 7 is connected with product storage tank 8 through connecting sleeve 10, and the upper portion of rear reactor 7 is equipped with air inlet 71, the tower reactor 2 and rear reactor 7 are transparent, and are filled with glass spring packing (not shown in the figure), and the lower portion of tower reactor 2 and rear reactor 7 is provided with packing support plate 24, 72 respectively for supporting glass spring packing. The light source 3 is arranged in the middle, and a plurality of tower reactors 2 are arranged in a ring array around the light source 3, and in the embodiment, one light source 3 corresponds to six tower reactors 2, energy is saved, and the efficiency of gas-liquid reaction is improved.

[0024] In the embodiment, the light source 3 is an ultraviolet lamp, and a cooling quartz cover is arranged outside the ultraviolet lamp. The cooling quartz cover can protect the ultraviolet lamp and also has a cooling effect.

[0025] In this embodiment, the upper end outlet 22 of the tower reactor 2 is connected with the condenser 1, and the upper end of the condenser 1 is connected with the hydrogen chloride gas outlet 9. The by-product hydrogen chloride generated in the reaction process is discharged from the hydrogen chloride gas outlet 9.

[0026] In this embodiment, the shell 4 comprises an inner shell and an outer shell, and cooling circulating water is introduced between the inner shell and the outer shell to dissipate heat for the reactor. The upper end and the lower end of the shell 4 are connected with the upper cover 5 and the lower cover 6 respectively, the center of the upper cover 5 is provided with a light source mounting hole 52, and the periphery is provided with a reactor mounting hole A51, and the lower cover 6 is provided with a reactor mounting hole B61 at the corresponding position, as shown in Figure 6 and Figure 7 The upper end and the lower end of the tower reactor 2 pass through the reactor mounting hole A51 and the reactor mounting hole B61 respectively and are detachably connected with the upper cover 5 and the lower cover 6, and the light source 3 enters the shell 4 from the light source mounting hole 52. The tower reactor 2 and the light source 3 are easy to assemble and disassemble with the shell 4, and are convenient for equipment installation and maintenance.

[0027] When the reactor is started, the light source 3 (ultraviolet light) is turned on, the gas inlet 71 at the upper part of the post-reactor 7 is introduced with chlorine, and the liquid raw material inlet 21 of the tower reactor 2 is introduced with dichloroethane. When the liquid reactant descends on the glass spring surface, it is contacted with the ascending gas, and the reaction occurs under the ultraviolet light. The product flows downward, consumes the dissolved chlorine at the post-reactor 7, enters the product storage tank 8, and can be continuously produced and removed from the product outlet 81. The by-product hydrogen chloride gas is separated into liquid and gas through the condenser 1 and is discharged through the hydrogen chloride gas outlet 9. The utility model has reasonable structure design, short reaction residence time, can prevent the over-chlorination of the reactant, controllable chlorination depth, low content of solid hexachloroethane, low energy consumption, chlorine utilization rate of more than 98%, dichloroethane conversion rate of more than 99%, and selectivity of more than 99%.

[0028] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photochlorination reactor for continuous production of polychlorinated ethanes, characterized in that: The device includes a shell and a tower reactor and a light source installed inside the shell. The tower reactor has a liquid raw material inlet at the top, an upper outlet at the top, and a lower outlet at the bottom. The lower outlet is connected to the inlet of the rear reactor, and the outlet of the rear reactor is connected to the product storage tank. The rear reactor has an air inlet at the top. The tower reactor and the rear reactor are transparent and filled with glass spring packing.

2. The photochlorination reactor for continuous production of polychlorinated ethanes according to claim 1, characterized in that: The light source is located in the center, and multiple tower reactors are arranged in a ring array around the light source.

3. The photochlorination reactor for continuous production of polychlorinated ethanes according to claim 2, characterized in that: The light source is an ultraviolet lamp, and a cooling quartz cover is provided outside the ultraviolet lamp.

4. A continuous photochlorination reactor for producing polychlorinated ethanes according to any one of claims 1-3, characterized in that: The upper outlet of the tower reactor is connected to the condenser, and the upper end of the condenser is connected to the hydrogen chloride gas outlet.

5. A continuous photochlorination reactor for producing polychlorinated ethanes according to any one of claims 1-3, characterized in that: The housing includes an inner shell and an outer shell, with cooling circulating water flowing between the inner shell and the outer shell.

6. The photochlorination reactor for continuous production of polychlorinated ethanes according to claim 2, characterized in that: The upper and lower ends of the shell are connected to the upper cover and the lower cover respectively. The upper cover has a light source mounting hole in the center and a reactor mounting hole A around the perimeter. The lower cover has a corresponding reactor mounting hole B. The upper and lower ends of the tower reactor pass through the reactor mounting hole A and the reactor mounting hole B respectively and are detachably connected to the upper cover and the lower cover. The light source enters the shell through the light source mounting hole.

Images