Refining treatment device for epoxy chloropropane saponification wastewater

Abstract

The utility model relates to the technical field of chemical wastewater treatment, in particular to a refining treatment device for epoxy chloropropane saponification wastewater, which aims to solve the technical problem that organic matters in a saponification device in the prior art are easy to accumulate in an evaporation device to cause waste and safety accidents, and specifically comprises a centrifugal separation unit and a concentration recovery unit, the centrifugal separation unit comprises a wastewater storage tank, an extraction agent storage tank, a pipeline mixer and an extraction centrifugal machine, and the extraction centrifugal machine is sequentially provided with a water phase discharge port and an oil phase discharge port from bottom to top; the concentration recovery unit comprises a recovery distillation tower and a tower bottom reboiler; according to the utility model, accumulation of organic matters in the subsequent evaporation process is avoided, so that the risks of corrosion, blockage and deflagration of evaporation equipment are reduced, the maintenance cost of the equipment is reduced, the production safety is improved, and the resource waste is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical wastewater treatment technology, and in particular to a refining treatment device for epichlorohydrin saponification wastewater. Background Technology

[0002] Epichlorohydrin is an important chemical raw material, generally produced by saponification of dichloropropanol and alkali. The saponification process generates a large amount of saline wastewater containing dissolved organic matter, primarily glycerol, dichloropropanol, and epichlorohydrin, with a mass fraction of approximately 1%. Current wastewater treatment equipment cannot remove this organic matter, leading to its gradual accumulation in the triple-effect evaporator during the subsequent process. This accumulation not only causes severe corrosion and blockage of the evaporation equipment, increasing maintenance costs, but also poses significant safety hazards due to the flammability and explosiveness of some organic compounds. Furthermore, this accumulated organic matter actually contains valuable chemical raw materials, resulting in substantial waste of these resources. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a refining treatment device for epichlorohydrin saponification wastewater, which is an improvement over the shortcomings of the prior art. This device can effectively treat the saline wastewater in the saponification process, recover the useful components, reduce the safety hazards in subsequent production processes, and improve the raw material reuse rate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A purification and treatment apparatus for epichlorohydrin saponification wastewater, characterized in that it includes:

[0006] The centrifugal separation unit includes a wastewater storage tank with a saponification wastewater inlet, an extractant storage tank with an extractant inlet, a pipeline mixer connected to both the wastewater storage tank and the extractant storage tank and used to mix the saponification wastewater and the extractant, and an extraction centrifuge connected to the outlet of the pipeline mixer and used to centrifuge the mixed solution of the saponification wastewater and the extractant. The extraction centrifuge is provided with an aqueous phase outlet and an oil phase outlet from bottom to top.

[0007] The concentration and recovery unit includes a recovery distillation column connected to the oil phase outlet, and a bottom reboiler connected to the recovery distillation column for circulating heating of the material inside the column. The bottom of the recovery distillation column is equipped with an organic matter recovery port, and the top of the recovery distillation column is equipped with an extractant recovery port. The extractant recovery port is connected to the extractant storage tank through a top recovery pipe. A top cooler is installed on the top recovery pipe to condense and liquefy the gaseous extractant.

[0008] The technical problem to be solved by this utility model can be further achieved through the following steps: one end of the pipeline mixer is provided with a first water inlet and a second water inlet, and the other end of the pipeline mixer is provided with a mixing outlet. The first water inlet of the pipeline mixer is connected to the bottom outlet of the wastewater storage tank through a first conveying pipe. The second water inlet of the pipeline mixer is connected to the bottom outlet of the extractant storage tank through a second conveying pipe. The mixing outlet of the pipeline mixer is connected to the inlet of the extraction centrifuge through a mixing conveying pipe.

[0009] The technical problem to be solved by this utility model can be further achieved through the following steps: a wastewater delivery shut-off valve and a wastewater delivery power pump are installed sequentially on the first delivery pipe along the water flow direction, and an extractant delivery shut-off valve and an extractant delivery power pump are installed sequentially on the second delivery pipe along the water flow direction.

[0010] The technical problem to be solved by this utility model can be further achieved through the following steps: the water phase outlet of the centrifugal separator is connected to a water phase discharge pipe, the oil phase outlet of the centrifugal separator is connected to an oil phase discharge pipe, and the other end of the oil phase discharge pipe is connected to the inlet of the recovery distillation tower.

[0011] The technical problem to be solved by this utility model can be further achieved through the following steps: the organic matter recovery port of the recovery distillation column is connected to a bottom recovery pipe; one end of the bottom reboiler is connected to the bottom recovery pipe through a first circulation branch pipe; the other end of the bottom reboiler is connected to the recovery distillation column through a second circulation branch pipe; and heat insulation cotton is provided on both the first circulation branch pipe and the second circulation branch pipe.

[0012] The technical problem to be solved by this utility model can be further achieved through the following steps: the top of the recovery distillation column is also provided with a vacuum port, which is connected to a vacuum device through a negative pressure pipe.

[0013] The technical problem to be solved by this utility model can be further achieved through the following steps: the height of the extractant recovery port is higher than the height of the extractant storage tank.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting up a centrifugal separation unit, the organic matter in the saponification wastewater is separated, avoiding the accumulation of organic matter in the subsequent evaporation process, thereby reducing the risk of corrosion, blockage and deflagration of the evaporation equipment, reducing equipment maintenance costs, and improving production safety; by setting up a concentration and recovery unit, the organic matter (such as glycerol, dichloropropanol and epichlorohydrin, etc.) in the wastewater is purified and recovered, so that it can be directly reused as raw material for chemical production, effectively reducing resource waste. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] In the diagram: 1-Wastewater storage tank; 2-Extractant storage tank; 3-Pipeline mixer; 4-Extraction centrifuge; 5-Recovery distillation column; 6-Bottom reboiler; 7-Top recovery pipe; 8-Top cooler; 9-First conveying pipe; 10-Second conveying pipe; 11-Mixed conveying pipe; 12-Wastewater conveying shut-off valve; 13-Wastewater conveying power pump; 14-Extractant conveying shut-off valve; 15-Extractant conveying power pump; 16-Aqueous phase discharge pipe; 17-Bottom recovery pipe; 18-First circulation branch pipe; 19-Second circulation branch pipe; 20-Negative pressure pipe; 21-Oil phase discharge pipe; 51-Organic matter recovery port; 52-Extractant recovery port. Detailed Implementation

[0017] The specific technical solutions of this utility model are further described below to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0019] Please refer to Figure 1 A purification treatment apparatus for epichlorohydrin saponification wastewater, comprising:

[0020] The centrifugal separation unit includes a wastewater storage tank 1 with a saponification wastewater inlet, an extractant storage tank 2 with an extractant inlet, a pipeline mixer 3 connected to both the wastewater storage tank 1 and the extractant storage tank 2 for mixing the saponification wastewater and the extractant, and an extraction centrifuge 4 connected to the outlet of the pipeline mixer 3 for centrifugal separation of the mixed solution of saponification wastewater and extractant. The extraction centrifuge 4 is provided with an aqueous phase outlet and an oil phase outlet from bottom to top. The aqueous phase outlet is used to discharge the lower layer of saline wastewater, and the oil phase outlet is used to discharge the upper layer of organic solution containing extractant.

[0021] The concentration and recovery unit includes a recovery distillation column 5 connected to the oil phase outlet, and a bottom reboiler 6 connected to the recovery distillation column 5 for circulating heating of the material inside the column. The bottom of the recovery distillation column 5 is provided with an organic matter recovery port 51, and the top of the recovery distillation column 5 is provided with an extractant recovery port 52. The extractant recovery port 52 is connected to the extractant storage tank 2 through a top recovery pipe 7. A top cooler 8 is installed on the top recovery pipe 7 to condense and liquefy the gaseous extractant.

[0022] One end of the pipeline mixer 3 is provided with a first water inlet and a second water inlet, and the other end of the pipeline mixer 3 is provided with a mixing outlet. The first water inlet of the pipeline mixer 3 is connected to the bottom outlet of the wastewater storage tank 1 through the first conveying pipe 9, and the second water inlet of the pipeline mixer 3 is connected to the bottom outlet of the extractant storage tank 2 through the second conveying pipe 10. The mixing outlet of the pipeline mixer 3 is connected to the inlet of the extraction centrifuge 4 through the mixing conveying pipe 11. The pipeline mixer 3 is a component well known to those skilled in the art. It is provided with several baffles inside, which can force the saponification wastewater and extractant in the path to mix, thereby effectively improving the extraction effect of the extraction centrifuge 4.

[0023] Wastewater delivery shut-off valve 12 and wastewater delivery power pump 13 are sequentially installed on the first delivery pipe 9 along the water flow direction, and extractant delivery shut-off valve 14 and extractant delivery power pump 15 are sequentially installed on the second delivery pipe 10 along the water flow direction.

[0024] The centrifuge 4 has an aqueous phase discharge pipe 16 connected to its aqueous phase discharge port and an oil phase discharge pipe 21 connected to its oil phase discharge port. The other end of the oil phase discharge pipe 21 is connected to the inlet of the recovery distillation tower 5. The aqueous phase discharge pipe 16 is connected to the subsequent triple-effect evaporation treatment device, which sends the separated saponified wastewater, which does not contain organic matter, into it for triple-effect evaporation treatment.

[0025] The organic matter recovery port 51 of the recovery distillation column 5 is connected to a bottom recovery pipe 17. One end of the bottom reboiler 6 is connected to the bottom recovery pipe 17 through a first circulation branch pipe 18, and the other end of the bottom reboiler 6 is connected to the recovery distillation column 5 through a second circulation branch pipe 19. Both the first circulation branch pipe 18 and the second circulation branch pipe 19 are covered with heat insulation cotton. The heat insulation cotton can effectively reduce the temperature loss of the pipeline and at the same time protect the staff from burns.

[0026] The top of the recovery distillation column 5 is also provided with a vacuum port, which is connected to a vacuum device through a negative pressure pipe 20; in this embodiment, the working pressure of the recovery distillation column 5 is set to -90 kPa.

[0027] The height of the extractant recovery port 52 is higher than the height of the extractant storage tank 2, so that the extractant recovered at the top of the tower can be naturally returned to the extractant storage tank 2 by gravity.

[0028] The extractant can be esters that are immiscible with water, such as dichloroethane, carbon trichloride, petroleum ether, ethyl acetate, and benzene, or halogenated hydrocarbons, aromatic hydrocarbons, and mixtures thereof.

[0029] Working principle: This utility model discloses a refining treatment device for epichlorohydrin saponification wastewater. In use, firstly, the wastewater discharge pipe of the saponification device is connected to the wastewater inlet of the wastewater storage tank 1, and the extractant inlet pipe is connected to the extractant inlet of the extractant storage tank 2. Then, the wastewater delivery shut-off valve 12 and the extractant delivery shut-off valve 14 are opened. The saponification wastewater and extractant are drawn from the wastewater storage tank 1 and the extractant storage tank 2 respectively by the wastewater delivery power pump 13 and the extractant delivery power pump 15 and sent to the pipeline mixer 3 for mixing. The mixed saponification wastewater and extractant form a mixed solution and are sent to the extraction centrifuge 4 through the mixing delivery pipe 11. Under the action of centrifugal force, they are separated into two layers: a lower layer of high-density saline wastewater and an upper layer of low-density organic solution containing extractant. The saline wastewater is discharged through the aqueous phase outlet and sent to the subsequent triple-effect evaporation treatment unit for further treatment via the aqueous phase outlet pipe 16. The organic solution containing the extractant is discharged through the oil phase outlet and directly enters the inlet of the recovery distillation tower 5 via the oil phase outlet pipe 21. In the recovery distillation tower 5, it is heated and separated into gaseous extractant and pure organic solution. The extractant vapor at the top of the tower is sent to the top cooler 8 through the top recovery pipe 7. After condensation and liquefaction, it flows back to the extractant storage tank 2. The organic matter (glycerol, dichloropropanol, epichlorohydrin, etc.) at the bottom of the tower is discharged into the storage container through the bottom recovery pipe 17 and reused as a valuable by-product.

[0030] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A purification and treatment apparatus for epichlorohydrin saponification wastewater, characterized in that, include: The centrifugal separation unit includes a wastewater storage tank with a saponification wastewater inlet, an extractant storage tank with an extractant inlet, a pipeline mixer connected to both the wastewater storage tank and the extractant storage tank and used to mix the saponification wastewater and the extractant, and an extraction centrifuge connected to the outlet of the pipeline mixer and used to centrifuge the mixed solution of the saponification wastewater and the extractant. The extraction centrifuge is provided with an aqueous phase outlet and an oil phase outlet from bottom to top. The concentration and recovery unit includes a recovery distillation column connected to the oil phase outlet, and a bottom reboiler connected to the recovery distillation column for circulating heating of the material inside the column. The bottom of the recovery distillation column is equipped with an organic matter recovery port, and the top of the recovery distillation column is equipped with an extractant recovery port. The extractant recovery port is connected to the extractant storage tank through a top recovery pipe. A top cooler is installed on the top recovery pipe to condense and liquefy the gaseous extractant.

2. The apparatus for refining treatment of epichlorohydrin saponification wastewater according to claim 1, characterized by: One end of the pipeline mixer is provided with a first water inlet and a second water inlet, and the other end of the pipeline mixer is provided with a mixing outlet. The first water inlet of the pipeline mixer is connected to the bottom outlet of the wastewater storage tank through a first conveying pipe, the second water inlet of the pipeline mixer is connected to the bottom outlet of the extractant storage tank through a second conveying pipe, and the mixing outlet of the pipeline mixer is connected to the inlet of the extraction centrifuge through a mixing conveying pipe.

3. The apparatus for refining treatment of epichlorohydrin saponification wastewater according to claim 2, characterized by: The first delivery pipe is equipped with a wastewater delivery shut-off valve and a wastewater delivery power pump in sequence along the water flow direction, and the second delivery pipe is equipped with an extractant delivery shut-off valve and an extractant delivery power pump in sequence along the water flow direction.

4. The apparatus for refining treatment of epichlorohydrin saponification wastewater according to claim 1, characterized by: The aqueous phase outlet of the extraction centrifuge is connected to an aqueous phase discharge pipe, and the oil phase outlet of the extraction centrifuge is connected to an oil phase discharge pipe. The other end of the oil phase discharge pipe is connected to the inlet of the recovery distillation tower.

5. The apparatus for refining treatment of epichlorohydrin saponification wastewater according to claim 1, characterized by: The organic matter recovery port of the recovery distillation column is connected to a bottom recovery pipe. One end of the bottom reboiler is connected to the bottom recovery pipe through a first circulation branch pipe, and the other end of the bottom reboiler is connected to the recovery distillation column through a second circulation branch pipe. Both the first and second circulation branch pipes are fitted with heat insulation cotton.

6. The refining and treatment apparatus for epichlorohydrin saponification wastewater according to claim 1, characterized in that: The top of the recovery distillation column is also equipped with a vacuum port, which is connected to a vacuum device through a negative pressure pipe.

7. The apparatus for refining treatment of epichlorohydrin saponification wastewater according to claim 1, characterized by: The height of the extractant recovery port is higher than the height of the extractant storage tank.

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