Water ring vacuum pump waste liquid treatment device

Abstract

A water ring vacuum pump waste liquid treatment device relates to the technical field of water-containing waste liquid treatment recycled in fine chemical industry production, and comprises a vacuum unit, an overflow liquid collecting tank, a waste liquid intermediate tank and the like, a water ring vacuum pump is connected with a vacuum interface, and an overflow port of a circulating water tank is connected with a top water inlet of the overflow liquid collecting tank through a pipeline; a magnetic turning plate liquid level meter is mounted on the side surface of the overflow liquid collecting tank; the bottom of the waste liquid intermediate tank is connected with a liquid inlet in the top of a rectification reaction kettle through a pipeline; the rectification reaction kettle is connected with the lower part of a rectification tower through a pipeline; the upper part of the rectification tower is connected with a condensation system; the upper part of the reflux tank is connected with the receiving tank and the methanol recovery tank through a pipeline, the upper part of the reflux tank is connected with the rectifying tower, and the bottoms of the receiving tank and the methanol recovery tank are connected with the rectifying reaction kettle. The device is simple in process, convenient to operate, easy to control and free of wastewater and hazardous waste discharge.

Description

Technical Field

[0001] This utility model relates to the field of water-containing waste liquid treatment technology recovered in fine chemical production. More precisely, it is a waste liquid treatment device for a water ring vacuum pump. Background Technology

[0002] In fine chemical production processes, vacuum technology is widely used to reduce separation temperatures and save energy. Vacuum units composed of water ring vacuum pumps and Roots vacuum pumps are common vacuum equipment used in vacuum systems. However, vacuum systems using water ring vacuum pumps generate wastewater and waste liquid, increasing treatment costs and environmental pressure.

[0003] Chinese utility model patent CN202122633258.3 relates to a water ring vacuum pump wastewater treatment device, belonging to the field of wastewater treatment technology. The wastewater treatment device includes a storage tank, sedimentation tank, and filter tank, all mounted on a base. A vacuum pump is installed on the pipeline connecting the outlet of the storage tank and the inlet I of the sedimentation tank. The inlet II of the sedimentation tank is connected to an external water source via a water supply pipeline. The outlet of the sedimentation tank is connected to the inlet of the filter tank via a siphon pipeline. The outlet of the filter tank is connected to the inlet of the storage tank via a circulation pipeline. An impurity outlet at the bottom of the sedimentation tank is used to discharge the impurities deposited inside. This wastewater treatment device has a simple structure, is easy to operate, and can effectively clean wastewater. Furthermore, the cleaned water can be recycled, avoiding water waste and showing good application prospects. However, this application utilizes the siphon effect and adds flocculants to separate sediment and water, which cannot meet the requirements of ester exchange process materials and has low utilization rate. Therefore, a new device is needed to solve the waste liquid problem. Utility Model Content

[0004] The purpose of this invention is to provide a waste liquid treatment device for water ring vacuum pumps to solve the problems of high waste liquid recycling costs and low reuse rates.

[0005] The purpose of this utility model is achieved through the following technical solution: a water ring vacuum pump waste liquid treatment device, comprising: a vacuum unit 1, an overflow collection tank 2, a waste liquid intermediate tank 4, a magnetic circulation pump 3, a distillation reactor 5, a distillation column 6, a condensation system 7, and a receiving tank 8. All components are connected by pipes. The vacuum unit 1 includes a water ring vacuum pump 12 and a circulating water tank 11. The water ring vacuum pump 12 is connected to the upper end of the circulating water tank 11 via a pipe, and the other end of the water ring vacuum pump 12 is connected to a vacuum interface. The circulating water tank 11 is provided with an overflow port, which is connected to the overflow collection tank 8 via a pipe. The top inlet of the overflow collection tank 2 is provided, and the bottom of the overflow collection tank 2 is provided with an outlet. The outlet is connected to the intermediate waste liquid tank 4 through a pipe. A magnetic circulation pump 3 is installed on the pipe. The bottom of the intermediate waste liquid tank 4 is connected to the top inlet of the distillation reactor 5 through a pipe. Methanol is added into the distillation reactor 5. The distillation reactor 5 is connected to the bottom of the distillation column 6 through a pipe. The top of the distillation column 6 is connected to the condensation system 7. The bottom of the condensation system 7 is connected to the reflux tank. The top of the reflux tank is connected to the receiving tank 8 and the methanol recovery tank 9 through a pipe. The top of the reflux tank is connected to the distillation column 6. The bottom of the receiving tank 8 and the methanol recovery tank 9 is connected to the distillation reactor 5.

[0006] The condensation system 7 is a two-stage cooling system, including a primary condenser and a secondary condenser. The primary condenser is cooled by circulating water, and the secondary condenser is cooled by refrigerant with a refrigerant temperature of -10 to -5°C.

[0007] The cryogenic fluid is an aqueous solution of ethylene glycol.

[0008] The height of the overflow port is 1 / 2 to 2 / 3 of the height of the circulating water tank.

[0009] The magnetic circulation pump 3 and the magnetic level gauge 10 form a level control system to automatically control the level, and control the level of the overflow collection tank to 5%-80%.

[0010] The distillation reactor is equipped with a material inlet, where methanol is added, and the weight ratio of waste liquid to methanol is 5:3.

[0011] The beneficial technical effects of this utility model are: simple process, convenient operation, and easy control; by using secondary distillation of methanol to separate water and methanol, the water content of the separated reaction material meets the feeding requirements of the reaction device, and the separated methanol meets the standard requirements of GB 338-2011 industrial methanol, which can be sold as a by-product; all separated materials are recycled and reused, which reduces production costs and environmental emissions, while making full use of the processing capacity of the production device, and has high practical value. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the process flow for this practical application. Detailed Implementation

[0013] The present application will now be clearly and completely described with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0014] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0015] A waste liquid treatment device for a water ring vacuum pump includes: a vacuum unit 1, an overflow collection tank 2, a waste liquid intermediate tank 4, a magnetic circulation pump 3, a distillation reactor 5, a distillation column 6, a condenser 7, and a receiving tank 8. The components are connected by pipelines. The vacuum unit 1 includes a water ring vacuum pump 12 and a circulating water tank 11. The water ring vacuum pump 12 is connected to the upper end of the circulating water tank 11 via a pipeline, and the other end of the water ring vacuum pump 12 is connected to a vacuum interface. The circulating water tank 11 is equipped with an overflow port. The overflow outlet is connected to the top inlet of the overflow collection tank 2 via a pipe. The overflow collection tank 2 has an outlet at its bottom. An automatic level control system is installed on the side of the overflow collection tank 2. Using this system, the water-containing waste liquid from the overflow collection tank is temporarily stored in the intermediate waste liquid tank 4. The bottom of the intermediate waste liquid tank 4 is connected to the top inlet of the distillation reactor 5 via a pipe. When the material in the intermediate waste liquid tank 4 reaches the required processing capacity, it is transferred to the distillation reactor 5. Methanol is then added through a pipe, with a waste liquid to methanol weight ratio of 5:1. 3. Stir and mix thoroughly, then turn on the heating of the distillation reactor 5 to separate the methanol and aqueous solution from the reactor 5. The distillation reactor 5 is connected to the distillation column 6, which is connected to the condensation system 7. The condensation system 7 includes a primary condenser and a secondary condenser. The primary condenser is connected to circulating water, and the secondary condenser freezes the liquid. The cooled liquid then enters the reflux tank. The upper part of the reflux tank is connected to the receiving tank 8 and the methanol recovery tank 9, and the lower part is connected to the distillation column. The methanol-water solution and methanol separated from the distillation in the reflux tank are cooled and sent to the receiving tank 8 and the methanol recovery tank 9, respectively. The bottom of the receiving tank 8 and the methanol recovery tank 9 are connected to the distillation reactor 5. The reactants are discharged from the bottom outlet of the distillation reactor 5 and sent to the reaction device for recycling. The methanol-water solution separated in the receiving tank 8 is returned to the distillation reactor 5 for re-distillation. The temperature at the top of the distillation column 6 is precisely controlled at 50°C. The separated methanol enters the methanol recovery tank 9, and after cooling, it is sent to the by-product storage tank for sale as a by-product. The methanol-containing water released from the bottom of the reactor is used as makeup water for the water ring vacuum pump.

[0016] The mixture of reactants and water, continuously enriched by the water ring vacuum pump system, is collected in an overflow collection tank via overflow. Aqueous wastewater is automatically controlled and concentrated in an intermediate wastewater tank. The wastewater treatment system is simple, easy to operate and control, and produces no wastewater or hazardous waste. Once the aqueous wastewater reaches its treatment capacity, it is sent to a distillation reactor, where a certain amount of methanol is added and thoroughly mixed before distillation. The methanol is recycled or sold as a byproduct, and the water is recycled as makeup water for the water ring vacuum system. The separated reactants, containing both raw materials and products, are returned to the production unit for feeding. Secondary distillation of methanol separates water and methanol, ensuring the separated reactants have the required water content for the reactor feed, and the separated methanol meets the GB 338-2011 standard for industrial methanol, allowing it to be sold as a byproduct. The complete recycling of separated materials reduces production costs and environmental emissions while fully utilizing the production unit's processing capacity. After separating the byproduct methanol, the distillation reactor contains water with a small amount of methanol, which is used as replenishment water for the water ring vacuum pump and is reused. This process is characterized by its simplicity, ease of operation, and complete recovery of all separated materials, reducing production costs and environmental emissions while fully utilizing the processing capacity of the production unit, thus possessing high practical value.

Claims

1. A waste liquid treatment device for a water ring vacuum pump, comprising: The vacuum unit (1), overflow collection tank (2), waste liquid intermediate tank (4), magnetic circulation pump (3), distillation reactor (5), distillation column (6) and condensation system (7), receiving tank (8), and circulating water tank (11) are characterized in that the vacuum unit (1) includes a water ring vacuum pump (12) and a circulating water tank (11). The water ring vacuum pump (12) is connected to the upper end of the circulating water tank (11) through a pipe, and the other end of the water ring vacuum pump (12) is connected to a vacuum interface. The circulating water tank (11) is provided with an overflow port. The overflow port of the circulating water tank (11) is connected to the top inlet of the overflow collection tank (2) through a pipe. The overflow collection tank (2) is provided with an outlet at the bottom. The outlet is connected to the... The waste liquid intermediate tank (4) is connected through a pipeline. A magnetic circulation pump (3) is installed on the pipeline. A magnetic float level gauge (10) is installed on the side of the overflow collection tank (2). The bottom of the waste liquid intermediate tank (4) is connected to the top inlet of the distillation reactor (5) through a pipeline. Methanol is added into the distillation reactor (5). The distillation reactor (5) is connected to the lower part of the distillation column (6) through a pipeline. The upper part of the distillation column (6) is connected to the condensation system (7). The reflux tank is connected below the condensation system (7). The upper part of the reflux tank is connected to the receiving tank (8) and the methanol recovery tank (9) through a pipeline. The upper part of the reflux tank is connected to the distillation column (6). The bottom of the receiving tank (8) and the methanol recovery tank (9) is connected to the distillation reactor (5).

2. The water ring vacuum pump waste liquid treatment device according to claim 1, characterized in that: The condensation system (7) is a two-stage cooling system, including a primary condenser and a secondary condenser. The primary condenser is cooled by circulating water, and the secondary condenser is cooled by refrigerant. The refrigerant temperature is -10 to -5℃.

3. The water ring vacuum pump waste liquid treatment device according to claim 2, characterized in that: The cryosol is an aqueous solution of ethylene glycol.

4. The water ring vacuum pump waste liquid treatment device according to claim 1, characterized in that: The overflow port height of the circulating water tank (11) is 1 / 2 to 2 / 3 of the height of the circulating water tank (11).

5. The water ring vacuum pump waste liquid treatment device according to claim 1, characterized in that: The magnetic circulation pump (3) and the magnetic level gauge (10) form a level control system to automatically control the level, and control the level of the overflow collection tank to 5%-80%.

6. The water ring vacuum pump waste liquid treatment device according to claim 1, characterized in that: The distillation reactor (5) is equipped with a material inlet, and methanol is added. The weight ratio of waste liquid to methanol is 5:3.

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