Hydrogen chloride recovery device for epichlorohydrin production

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a hydrogen chloride recovery device for epichlorohydrin production, which comprises an adsorption tower, a drying tank connected with the adsorption tower through a pipeline, a hydrogen chloride recovery pipeline connected with the lower part of the adsorption tower, a drying sprayer arranged at the top of the drying tank, and a drying sprayer connected with the bottom of the drying tank through a pipeline, the top of the drying tank is connected with a chlorination tower, the top of the chlorination tower is provided with a gas pipeline, the bottom of the chlorination tower is provided with a turbulent flow assembly, the gas pipeline extends to one side of the turbulent flow assembly, the upper portion of the chlorination tower is provided with a first glycerin sprayer, the first glycerin sprayer is connected with a glycerin pipeline, and the glycerin pipeline is further connected with a reabsorption tower. The top of the chlorination tower is sequentially connected with a molecular sieve water removal tank and an adsorption tank; the top of the adsorption tank is connected with a pipeline between the adsorption tower and the drying tank. According to the utility model, hydrogen chloride in epichlorohydrin prepared by a glycerol method is recovered, so that the utilization rate of raw materials is improved, and the waste of resources is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a hydrogen chloride recovery device for epichlorohydrin production. Background Art

[0002] Epichlorohydrin is used in synthetic resins, pharmaceuticals, pesticides, and other fields. As a key raw material for epoxy resin synthesis, it is widely used in the electronics, coatings, adhesives, and other industries. The glycerol process for producing epichlorohydrin, using glycerol as a raw material, offers low cost and a gentle production process, reducing corrosion and pollution, aligning with sustainable development trends.

[0003] In the glycerol-based epichlorohydrin production process, hydrogen chloride participates in the chlorination reaction as a reaction raw material. However, since hydrogen chloride cannot react completely, some hydrogen chloride will be carried in the chlorination reaction tail gas. If not handled in time, it will cause pollution and waste. The tail gas of the chlorination reaction is also mixed with a small amount of impurities, and the tail gas treatment process is relatively complicated.

[0004] The existing epichlorohydrin production process consumes a large amount of alkali solution to treat hydrogen chloride and generates a large amount of waste materials. These waste materials cannot be recycled, resulting in a waste of resources. Utility Model Content

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a hydrogen chloride recovery device for epichlorohydrin production, which recycles the hydrogen chloride in the preparation of epichlorohydrin by the glycerol method and reduces resource waste.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The utility model discloses a hydrogen chloride recovery device for epichlorohydrin production, comprising an adsorption tower, which is connected to a drying tank via a pipeline, a hydrogen chloride recovery pipeline connected to the lower portion of the adsorption tower, a drying sprayer provided on the top of the drying tank, a drying sprayer connected to the bottom of the drying tank via a pipeline, a chlorination tower connected to the top of the chlorination tower, a gas pipeline provided on the top of the chlorination tower, a flow disturbance component provided on the bottom of the chlorination tower, the gas pipeline extending to one side of the flow disturbance component, a glycerin sprayer first provided on the top of the chlorination tower, the glycerin sprayer first connected to a glycerin pipeline, the glycerin pipeline further connected to a reabsorption tower, a molecular sieve dewatering tank and an adsorption tank connected in sequence on the top of the chlorination tower, and a pipeline between the adsorption tower and the drying tank connected to the top of the adsorption tank.

[0008] in:

[0009] The upper part of the drying tank is provided with a drying liquid inlet, and the pipeline between the bottom of the drying tank and the drying sprayer is provided with a circulation pump and a branch pipe.

[0010] The top of the drying tank is connected with a gas pipeline through a pipeline, and a compressor is arranged between the gas pipeline and the drying tank.

[0011] A material pump is arranged on the pipeline between the adsorption tower and the drying tank.

[0012] The turbulence component comprises an external fixed shell and an internal movable turbulence fan.

[0013] A plurality of through holes are arranged on the fixed shell in a spaced manner.

[0014] The fixed shell is horizontally arranged at the bottom of the chlorination tower, and a motor is connected to the end of the turbulence fan, which is away from the gas pipeline, and horizontally penetrates the side of the chlorination tower.

[0015] The gas pipeline is arranged vertically to the plane where the rotating direction of the turbulence fan is located, and the plane where the bottom end of the gas pipeline is located is between the bottom of the turbulence fan and the bottom of the fixed shell.

[0016] The chlorination tower is provided with a material pipeline at the bottom, a glycerol sprayer two is arranged at the upper part of the reabsorption tower, the glycerol sprayer two is connected with a glycerol pipeline, the bottom of the reabsorption tower is connected with the glycerol sprayer two through a pipeline, and a tail pipe is arranged on the pipeline between the bottom of the reabsorption tower and the glycerol sprayer two.

[0017] The molecular sieve water removal tank and the adsorption tank are both provided with two, the molecular sieve water removal tank is provided with a nitrogen inlet pipe and a nitrogen outlet pipe, and the nitrogen outlet pipe is connected with the lower part of the reabsorption tower.

[0018] The utility model has the beneficial effects that:

[0019] The utility model discloses a method for preparing epichlorohydrin by glycerol, and hydrogen chloride in the preparation of epichlorohydrin is recycled and reacts with glycerol again, so that the prepared material can continue to participate in the production of epichlorohydrin, the utilization rate of raw materials is improved, and resource waste is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic diagram of the utility model;

[0021] Figure 2 It is the structure schematic diagram of the turbulence component of the utility model;

[0022] Figure 3It is fixed shell structure schematic diagram of the utility model;

[0023] Figure 4 It is turbulence fan structure schematic diagram of the utility model;

[0024] Figure 5 It is turbulence subassembly and gas pipeline structure schematic diagram of the utility model;

[0025] In the drawing: 1, drying tank;2, chlorination tower;3, motor;4, reabsorption tower;5, glycerol pipeline;6, molecular sieve water removal tank;7, adsorption tank;8, adsorption tower;101, drying sprayer;102, drying liquid inlet;103, compressor;104, circulating pump;201, material pipeline;202, glycerol sprayer one;203, turbulence subassembly;204, gas pipeline;401, glycerol sprayer two;601, nitrogen gas inlet pipe;602, nitrogen gas outlet pipe;801, hydrogen chloride recovery pipeline;802, material pump;2031, fixed shell;2032, turbulence fan. DETAILED DESCRIPTION

[0026] The embodiments of the utility model are further described below in combination with the drawings.

[0027] Embodiment 1

[0028] As Figures 1-5 Shown, the utility model discloses the hydrogen chloride recovery device for the production of epichlorohydrin, including adsorption tower 8, adsorption tower 8 is connected with drying tank 1 through the pipeline, adsorption tower 8 lower part is connected with hydrogen chloride recovery pipeline 801, drying tank 1 top is provided with drying sprayer 101, drying tank 1 bottom is connected with drying sprayer 101 through the pipeline, drying tank 1 top is connected with chlorination tower 2, and chlorination tower 2 top is provided with gas pipeline 204, and chlorination tower 2 bottom is provided with turbulence subassembly 203, and gas pipeline 204 extends to one side of turbulence subassembly 203, and chlorination tower 2 upper portion is provided with glycerol sprayer one 202, and glycerol sprayer one 202 is connected with glycerol pipeline 5, and glycerol pipeline 5 is also connected with reabsorption tower 4, and chlorination tower 2 top is sequentially connected with molecular sieve water removal tank 6 and adsorption tank 7, and the pipeline between adsorption tank 7 top and adsorption tower 8 and drying tank 1 is connected.

[0029] Drying tank 1 upper portion is provided with drying liquid inlet 102, and the pipeline between drying tank 1 bottom and drying sprayer 101 is provided with circulating pump 104 and branch pipe.

[0030] Drying tank 1 top is connected with gas pipeline 204 through the pipeline, and compressor 103 is arranged between gas pipeline 204 and drying tank 1.

[0031] Material pump 802 is arranged on the pipeline between adsorption tower 8 and drying tank 1.

[0032] The turbulence assembly 203 comprises an external fixed shell 2031 and an internal movable turbulence fan 2032.

[0033] The fixed shell 2031 is provided with a plurality of through holes.

[0034] The fixed shell 2031 is horizontally arranged at the bottom of the chlorination tower 2, and the turbulence fan 2032 is horizontally penetrated through the side of the chlorination tower 2 and connected with the motor 3 away from one end of the gas pipeline 204.

[0035] The gas pipeline 204 is perpendicular to the plane where the rotating direction of the turbulence fan 2032 is located, and the plane where the bottom end of the gas pipeline 204 is located is between the bottom of the turbulence fan 2032 and the bottom of the fixed shell 2031.

[0036] The chlorination tower 2 is provided with a material pipeline 201 at the bottom, the glycerol sprayer two 401 is arranged at the upper part of the reabsorption tower 4, the glycerol sprayer two 401 is connected with the glycerol pipeline 5, the bottom of the reabsorption tower 4 is connected with the glycerol sprayer two 401 through a pipeline, and a tail pipe is arranged on the pipeline between the bottom of the reabsorption tower 4 and the glycerol sprayer two 401.

[0037] The molecular sieve water removal tank 6 and the adsorption tank 7 are both provided with two, the molecular sieve water removal tank 6 is provided with a nitrogen inlet pipe 601 and a nitrogen outlet pipe 602, and the nitrogen outlet pipe 602 is connected with the lower part of the reabsorption tower 4.

[0038] Working principle and process:

[0039] The tail gas containing hydrogen chloride gas enters the adsorption tower 8 to remove organic impurities, and then enters the drying tank 1, and concentrated sulfuric acid is added through the drying liquid inlet 102 to remove water in the gas, the concentrated sulfuric acid is discharged from the bottom of the drying tank 1 and enters the drying sprayer 101 through the circulating pump 104 to be sprayed, and the water in the gas is removed in circulation; the dried gas is compressed by the compressor 103 and enters the chlorination tower 2 for reaction, the hydrogen chloride gas is sprayed into the turbulence assembly 203 through the gas pipeline 204, and is further dispersed by the rotating screen of the turbulence assembly 203, the glycerol sprayer one 202 sprays the glycerol uniformly into the chlorination tower 2 to fully contact with the hydrogen chloride, the liquid level in the chlorination tower 2 is still increased to increase the gas-liquid mixing degree through the turbulence assembly 203, a small part of unreacted hydrogen chloride gas is treated by the molecular sieve water removal tank 6 and the adsorption tank 7 and then enters the drying tank 1 to repeat the above process again, nitrogen is introduced into the molecular sieve water removal tank 6 to be purged after the molecular sieve water removal tank 6 is used for a period of time, the nitrogen carries part of the hydrogen chloride in the molecular sieve water removal tank 6 into the resorption tower 4, glycerol is introduced into the resorption tower 4 to further treat the hydrogen chloride gas in the nitrogen, the emission of hydrogen chloride is reduced, the number of molecular sieve water removal tanks 6 and adsorption tanks 7 used according to production needs is selected, and the molecular sieve water removal tank 6 and the adsorption tank 7 are connected in series or in parallel through valve switching, and the effective treatment and recycling of hydrogen chloride gas are realized, the consumption is reduced, the production is ensured, and the environmental protection requirements are considered.

Claims

1. A hydrogen chloride recovery device for epichlorohydrin production, comprising an adsorption tower (8), characterized in that: The adsorption tower (8) is connected to the drying tank (1) through a pipeline, the lower part of the adsorption tower (8) is connected to the hydrogen chloride recovery pipeline (801), the top of the drying tank (1) is provided with a drying sprayer (101), the bottom of the drying tank (1) is connected to the drying sprayer (101) through a pipeline, the top of the drying tank (1) is connected to the chlorination tower (2), the top of the chlorination tower (2) is provided with a gas pipeline (204), the bottom of the chlorination tower (2) is provided with a turbulence component (203), the gas pipeline (204) extends to one side of the turbulence component (203), the upper part of the chlorination tower (2) is provided with a glycerol sprayer (202), the glycerol sprayer (202) is connected to a glycerol pipeline (5), the glycerol pipeline (5) is further connected to the reabsorption tower (4), the top of the chlorination tower (2) is connected to a molecular sieve dewatering tank (6) and an adsorption tank (7) in sequence, and the top of the adsorption tank (7) is connected to the pipeline between the adsorption tower (8) and the drying tank (1).

2. The hydrogen chloride recovery device for epichlorohydrin production according to claim 1, characterized in that: A drying liquid inlet (102) is provided on the upper portion of the drying tank (1), and a circulation pump (104) and a branch pipe are provided on the pipeline between the bottom of the drying tank (1) and the drying sprayer (101).

3. The hydrogen chloride recovery device for epichlorohydrin production according to claim 1, characterized in that: The top of the drying tank (1) is connected to the gas pipeline (204) through a pipeline, and a compressor (103) is provided between the gas pipeline (204) and the drying tank (1).

4. The hydrogen chloride recovery device for epichlorohydrin production according to claim 1, characterized in that: A material pump (802) is provided on the pipeline between the adsorption tower (8) and the drying tank (1).

5. The hydrogen chloride recovery device for epichlorohydrin production according to claim 1, characterized in that: The spoiler assembly (203) comprises an external fixed shell (2031) and an internal movably arranged spoiler fan (2032).

6. The hydrogen chloride recovery device for epichlorohydrin production according to claim 5, characterized in that: A plurality of through holes are arranged at intervals on the fixed shell (2031).

7. The hydrogen chloride recovery device for epichlorohydrin production according to claim 5, characterized in that: The fixed shell (2031) is horizontally arranged at the bottom of the chlorination tower (2), and the end of the turbulent fan (2032) away from the gas pipeline (204) horizontally penetrates the side of the chlorination tower (2) and is connected to the motor (3).

8. The hydrogen chloride recovery device for epichlorohydrin production according to claim 5, characterized in that: The gas outlet direction of the gas pipeline (204) is perpendicular to the plane where the turbulent fan (2032) rotates, and the plane where the bottom end of the gas pipeline (204) is located is located between the bottom of the turbulent fan (2032) and the bottom of the fixed shell (2031).

9. The hydrogen chloride recovery device for epichlorohydrin production according to claim 1, characterized in that: A material pipeline (201) is provided at the bottom of the chlorination tower (2), a glycerin sprayer (2) (401) is provided at the top of the reabsorption tower (4), the glycerin sprayer (2) (401) is connected to the glycerin pipeline (5), the bottom of the reabsorption tower (4) is connected to the glycerin sprayer (2) (401) through a pipeline, and a tail pipe is provided on the pipeline between the bottom of the reabsorption tower (4) and the glycerin sprayer (2) (401).

10. The hydrogen chloride recovery device for epichlorohydrin production according to claim 1, characterized in that: There are two molecular sieve dewatering tanks (6) and two adsorption tanks (7). A nitrogen inlet pipe (601) and a nitrogen outlet pipe (602) are provided on the molecular sieve dewatering tank (6). The nitrogen outlet pipe (602) is connected to the lower part of the reabsorption tower (4).

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