Wastewater treatment system for dioctyl terephthalate production

Abstract

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment system for dioctyl terephthalate production, which comprises a settling tank, a distillation tower connected with the settling tank, a heating component arranged outside the distillation tower, a steam compressor connected with the top of the distillation tower and an alcohol liquid recovery tank connected with the top of the distillation tower, and a steam buffer tank connected with the alcohol liquid recovery tank. The bottom of the settling tank and the bottom of the distillation tower are connected with waste residue storage tanks, a filter assembly is arranged in the settling tank, and a plurality of buffer plates are arranged in the steam buffer tank in a staggered mode. According to the utility model, the distillation unit in the wastewater recycling process is combined with energy recycling, so that the operation cost of the whole wastewater treatment system is further greatly reduced, heat generated in the distillation process can realize self-circulation and can also be used for other production links, and centralized and reduction treatment of waste residues is realized.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a wastewater treatment system for the production of dioctyl terephthalate. Background Technology

[0002] The production process of dioctyl terephthalate mainly includes esterification, neutralization, water washing, de-alcoholization, and filtration. The wastewater generated in the production process has a complex composition, characterized by high acidity, oil content, ester and alcohol organic matter, and uneven biodegradability.

[0003] Existing dioctyl terephthalate (DTP) wastewater treatment technologies have made progress in recovering octanol and purifying water. However, the system still requires a large amount of external energy, such as steam and electricity, and the various waste residues generated by each unit are often disposed of separately, posing risks of secondary pollution, high transportation costs, and underutilization of resources. In particular, regarding energy recovery, the waste heat carried by the wastewater itself and the reaction heat generated during the reaction process are not effectively utilized within the system.

[0004] Therefore, there is an urgent need for an integrated treatment device specifically designed for dioctyl terephthalate (DTP) production wastewater that is highly targeted, efficient, and stable in operation. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a wastewater treatment system for the production of dioctyl terephthalate, so as to realize the reuse of energy in wastewater and the orderly discharge of wastewater.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] The wastewater treatment system for the production of dioctyl terephthalate according to this utility model includes a settling tank, which is connected to a distillation column. A heating component is installed outside the distillation column. A steam compressor and an alcohol recovery tank are connected to the top of the distillation column. The steam compressor is connected to a steam buffer tank. Waste residue storage tanks are connected to the bottom of both the settling tank and the bottom of the distillation column. A filter component is installed inside the settling tank. Several buffer plates are arranged alternately inside the steam buffer tank.

[0008] in:

[0009] The filter assembly includes several filter screens, which are spaced apart and connected at their ends, and are arranged in a funnel shape.

[0010] The settling tank is equipped with a horizontal telescopic rod inside, and a scraper is vertically connected to the end of the telescopic rod.

[0011] The heating assembly includes a heat exchange jacket installed at the top of the distillation column, a heating jacket one installed in the middle of the distillation column, and a heating jacket two installed at the bottom of the distillation column.

[0012] The top of the steam buffer tank is connected to the heat exchange jacket.

[0013] The steam buffer tank is provided with several buffer plates at intervals at both the top and bottom, and the buffer plates at the top and bottom of the steam buffer tank are arranged alternately.

[0014] The distillation column is provided with several condensation baffles in the middle, and the several condensation baffles are spaced apart on the inner wall of the distillation column.

[0015] The condensing baffle is inclined, and the height of the end of the condensing baffle away from the inner wall of the distillation column is higher than the height of the end of the condensing baffle connected to the inner wall of the distillation column.

[0016] The bottom of the distillation column is equipped with a stirrer, which is composed of several stirring rods connected together, and the stirring rods are all arranged in a semi-circular shape.

[0017] The stirrer is equipped with a connecting rod at the top, which passes through the distillation column and is connected to a motor.

[0018] The beneficial effects of this utility model are:

[0019] This invention combines the distillation unit of the wastewater recycling process with energy recovery and utilization, which further reduces the operating cost of the entire wastewater treatment system. The heat generated in the distillation process can be self-circulated and used in other production processes, reducing dependence on external energy and enhancing the independence and environmental value of the device. Reusing process waste heat significantly reduces the external energy required for system operation, and steam recovery can greatly improve the recovery and utilization of energy in the production process, maximizing the utilization of production materials.

[0020] This invention also achieves centralized and reduced-volume treatment of waste residue, recycling and uniformly treating all types of waste residue from the production process. The volume and weight of the dried waste residue are significantly reduced, transportation and disposal costs are lowered, and the calorific value is increased, making it a potential auxiliary fuel or building material raw material. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the stirrer structure of this utility model;

[0023] In the diagram: 1. Settling tank 1; 2. Distillation column; 3. Steam compressor; 4. Steam buffer tank; 5. Alcohol recovery tank; 6. Waste residue storage tank; 7. Buffer plate; 8. Filter screen; 9. Condensation baffle; 10. Stirrer; 11. Connecting rod; 12. Telescopic rod; 13. Scraper; 201. Heat exchange jacket; 202. Heating jacket one; 203. Heating jacket two. Detailed Implementation

[0024] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1-2 As shown, the wastewater treatment system for the production of dioctyl terephthalate according to this utility model includes a settling tank 1, a distillation tower 2 connected to the settling tank 1, a heating component installed on the outside of the distillation tower 2, a steam compressor 3 and an alcohol recovery tank 5 connected to the top of the distillation tower 2, a steam buffer tank 4 connected to the steam compressor 3, waste residue storage tanks 6 connected to the bottom of both the settling tank 1 and the bottom of the distillation tower 2, a filter component installed inside the settling tank 1, and several buffer plates 7 arranged alternately inside the steam buffer tank 4.

[0027] The filter assembly includes several filter screens 8, which are spaced apart and connected at their ends. The filter screens 8 are arranged in a funnel shape.

[0028] A telescopic rod 12 is horizontally installed inside the settling tank 1, and a scraper 13 is vertically connected to the end of the telescopic rod 12.

[0029] The heating assembly includes a heat exchange jacket 201 installed at the top of the distillation column 2, a heating jacket 202 installed in the middle of the distillation column 2, and a heating jacket 203 installed at the bottom of the distillation column 2.

[0030] The top of the steam buffer tank 4 is connected to the heat exchange jacket 201.

[0031] The top and bottom of the steam buffer tank 4 are each provided with a number of buffer plates 7 at intervals. The number of buffer plates 7 at the top of the steam buffer tank 4 and the number of buffer plates 7 at the bottom of the steam buffer tank 4 are arranged alternately.

[0032] Several condensing baffles 9 are provided in the middle of the distillation column 2, and the several condensing baffles 9 are spaced apart on the inner wall of the distillation column 2.

[0033] The condenser baffle 9 is set at an angle, and the height of the end of the condenser baffle 9 away from the inner wall of the distillation column 2 is higher than the height of the end of the condenser baffle 9 connected to the inner wall of the distillation column 2.

[0034] A stirrer 10 is installed at the bottom of the distillation column 2. The stirrer 10 is composed of several stirring rods connected together, and the stirring rods are all arranged in a semi-circular shape.

[0035] A connecting rod 11 is provided at the top of the stirrer 10, and the connecting rod 11 passes through the distillation column 2 and is connected to a motor.

[0036] Working principle and process:

[0037] After all the wastewater from the production process is sent to settling tank 1, the filter components intercept large particles of impurities to prevent them from entering the distillation column 2 and causing blockages that would affect the distillation effect. Simultaneously, impurities in the wastewater inside settling tank 1 settle at the bottom. During distillation, the supernatant is fed into distillation column 2, and then the motor is turned on to rotate the agitator 10, preventing small impurities carried in the wastewater from adhering to the bottom of distillation column 2. Because the small amount of octanol impurities in the wastewater has a high boiling point, higher temperatures are used for heating in the middle and lower parts of distillation column 2, while steam heat exchange is used in the upper part. The water in distillation column 2 evaporates continuously after heating and accumulates in the upper part of distillation column 2. Meanwhile, the condenser baffle 9 intercepts octanol and other substances. To increase the concentration of steam and prevent the steam from carrying other substances out due to excessively high temperature at the top of distillation column 2, the steam is compressed by steam compressor 3 to increase its temperature and pressure, and then buffered by steam buffer tank 4 before being discharged. Part of the steam is reused for heating distillation column 2, and the remainder can be used for other production processes of dioctyl terephthalate. After the water inside distillation column 2 is discharged, the temperature of heating jacket 1 202 and heating jacket 2 203 is increased to discharge octanol inside distillation column 2. The discharged octanol can be further collected and recovered. The remaining impurities are transported from the bottom of distillation column 2 to waste residue storage tank 6. In settling tank 1, the waste residue settled at the bottom of settling tank 1 is transported to waste residue storage tank 6 by telescopic rod 12 and scraper 13 for further processing.

Claims

1. A wastewater treatment system for the production of dioctyl terephthalate, comprising a settling tank (1), characterized in that, The settling tank (1) is connected to the distillation column (2). The distillation column (2) is equipped with a heating component. The top of the distillation column (2) is connected to a steam compressor (3) and an alcohol recovery tank (5). The steam compressor (3) is connected to a steam buffer tank (4). The bottom of the settling tank (1) and the bottom of the distillation column (2) are both connected to a waste residue storage tank (6). The settling tank (1) is equipped with a filter component. The steam buffer tank (4) is equipped with several buffer plates (7) arranged alternately inside.

2. The wastewater treatment system for the production of dioctyl terephthalate according to claim 1, characterized in that, The filter assembly includes several filter screens (8), which are spaced apart and connected at their ends. The filter screens (8) are arranged in a funnel shape.

3. The wastewater treatment system for the production of dioctyl terephthalate according to claim 1, characterized in that, A telescopic rod (12) is horizontally installed on the inner side of the settling tank (1), and a scraper (13) is vertically connected to the end of the telescopic rod (12).

4. The wastewater treatment system for the production of dioctyl terephthalate according to claim 1, characterized in that, The heating components include a heat exchange jacket (201) installed at the top of the distillation column (2), a heating jacket one (202) installed in the middle of the distillation column (2), and a heating jacket two (203) installed at the bottom of the distillation column (2).

5. The wastewater treatment system for the production of dioctyl terephthalate according to claim 4, characterized in that, The top of the steam buffer tank (4) is connected to the heat exchange jacket (201).

6. The wastewater treatment system for the production of dioctyl terephthalate according to claim 1, characterized in that, Several buffer plates (7) are provided at intervals on the top and bottom of the steam buffer tank (4). The buffer plates (7) on the top of the steam buffer tank (4) and the buffer plates (7) at the bottom of the steam buffer tank (4) are arranged alternately.

7. The wastewater treatment system for the production of dioctyl terephthalate according to claim 1, characterized in that, Several condensing baffles (9) are provided in the middle of the distillation column (2), and the several condensing baffles (9) are spaced apart on the inner wall of the distillation column (2).

8. The wastewater treatment system for the production of dioctyl terephthalate according to claim 7, characterized in that, The condenser baffle (9) is set at an angle, and the height of the end of the condenser baffle (9) away from the inner wall of the distillation column (2) is higher than the height of the end of the condenser baffle (9) connected to the inner wall of the distillation column (2).

9. The wastewater treatment system for the production of dioctyl terephthalate according to claim 1, characterized in that, A stirrer (10) is provided at the bottom of the distillation column (2). The stirrer (10) is composed of several stirring rods connected together, and the stirring rods are all arranged in a semi-circular shape.

10. The wastewater treatment system for the production of dioctyl terephthalate according to claim 9, characterized in that, A connecting rod (11) is provided on the top of the stirrer (10), and the connecting rod (11) passes through the distillation column (2) and is connected to a motor.

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