Cyanoethyl ester distillation recovery system

Abstract

A cyanoethyl ester distillation recovery system comprises a distillation still, an outlet of the distillation still is communicated with an inlet of a condenser, an outlet of the condenser is communicated with a first pipeline, a second pipeline and a third pipeline, the first pipeline, the second pipeline and the third pipeline are arranged in parallel, the first pipeline is communicated with a front fraction tank, and the second pipeline is communicated with a rear fraction tank. The second pipeline is communicated with the medium fraction tank, and the third pipeline is communicated with the finished product tank; and an outlet of the middle fraction tank is communicated with the condenser through a water pump. According to the utility model, the middle fraction in the middle fraction tank is re-pumped into the distillation kettle, the middle fraction and a crude product in the distillation kettle are fully mixed and re-distilled, and a part of ethyl ester product is recycled, so that the effective recycling of raw materials is realized, and the production rate of the ethyl ester product is improved; the generation and emission of wastes are reduced, and the environmental protection pressure and emission cost of enterprises are reduced.

Description

Technical Field

[0001] This utility model relates to a recycling system, specifically, to a cyanoethyl ester distillation recycling system. Background Technology

[0002] The processing of cyanoethyl ester involves three steps: aeration, salt formation, and distillation. In the salt formation step, the crude product from the crude product tank at the salt formation station is drawn into the distillation vessel. The steam inlet valve of the distillation vessel jacket is opened, and vacuum distillation is performed by adjusting the opening of the manual steam valve. After distillation, the finished product valve is closed, the vent valve on the distillation vessel is opened, and then the nitrogen valve is slowly opened to replace the gas in the distillation vessel with a slight negative pressure. The nitrogen valve is then closed, and rinsing water is added to the distillation vessel to clean away any residue.

[0003] Distillation of the crude product yields a fore-rice fraction, a middle fraction, and a finished product. The fore-rice fraction, typically collected at the beginning of distillation, may contain low-boiling impurities or unwanted components. The finished product, the final desired substance, is obtained through a series of carefully controlled and separated steps. However, the middle fraction, which may contain some ethyl ester, is usually considered a byproduct and, in some cases, is even discharged directly as wastewater. This wastewater discharge requires specialized personnel, increasing manpower and resources and causing waste. Furthermore, the wastewater needs to be treated to meet emission standards before discharge, increasing costs. This is a shortcoming of the existing technology. Utility Model Content

[0004] The purpose of this invention is to solve the problems mentioned in the background art, and to propose a cyanoethyl ester distillation recovery system.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a cyanoethyl ester distillation recovery system, including a distillation kettle, the outlet of the distillation kettle being connected to the inlet of a condenser, the outlet of the condenser being connected to a first pipe, a second pipe, and a third pipe, the first pipe, the second pipe, and the third pipe being arranged in parallel, the first pipe being connected to the pre-distillation tank, the second pipe being connected to the middle distillation tank, and the third pipe being connected to the finished product tank; the outlet of the middle distillation tank is connected to the condenser through a water pump.

[0006] A further improvement of this utility model is that the middle fraction tank includes a tank body, a feed inlet is provided at the top of the tank body, a discharge outlet is provided at the bottom of the tank body, a valve is provided at the discharge outlet, the discharge outlet is connected to the water inlet of a water pump, and the water outlet of the water pump is connected to the recovery port of the condenser.

[0007] A further improvement of this utility model is that the top of the middle fractionation tank is provided with a cover, the cover including a cover plate, and a surrounding plate fixed around the cover plate, the surrounding plate being in contact with the outer wall of the middle fractionation tank.

[0008] A further improvement of this utility model is that a sealing ring is provided on the inner wall of the enclosure.

[0009] A further improvement of this utility model is that a filter screen is fixed on the cover plate and below the feed inlet.

[0010] A further improvement of this utility model is that the trough is fixed on the support leg, the support leg is provided with a mounting plate, and the water pump is fixed on the mounting plate.

[0011] The beneficial effects of this utility model are: the middle fraction in the middle fraction tank is fed back into the distillation kettle, and the middle fraction is fully mixed with the crude product in the distillation kettle and redistilled to recover part of the ethyl ester product, thereby realizing the effective recycling of raw materials and improving the production rate of ethyl ester products; it also reduces the generation and emission of waste, and lowers the environmental pressure and emission costs of enterprises. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the middle distillation tank;

[0014] Figure 3 for Figure 1 Enlarged view of the structure at point A in the middle;

[0015] In the diagram, 1 is the distillation vessel, 2 is the condenser, 3 is the first pipe, 4 is the second pipe, 5 is the third pipe, 6 is the fore-distillate tank, 7 is the middle-distillate tank, 71 is the feed inlet, 72 is the discharge outlet, 8 is the finished product tank, 9 is the water pump, 101 is the cover plate, 102 is the enclosure plate, 11 is the filter screen, 12 is the support leg, 13 is the mounting plate, and 14 is the sealing ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. 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. The present utility model will be further described with reference to the accompanying drawings and embodiments:

[0017] like Figure 1-3As shown, a cyanoethyl ester distillation recovery system includes a distillation kettle 1, the outlet of which is connected to the inlet of a condenser 2. The outlet of the condenser 2 is connected to a first pipe 3, a second pipe 4, and a third pipe 5, which are arranged in parallel. The first pipe 3 is connected to a pre-distillation tank 6, the second pipe 4 is connected to a middle distillation tank 7, and the third pipe 5 is connected to a finished product tank 8. The outlet of the middle distillation tank 7 is connected to the condenser 2 via a water pump 8.

[0018] The crude product is fed into distillation vessel 1 for distillation. After distillation, it enters condenser 2 for condensation. The component collected in the initial stage of distillation is the fore-fraction, which enters the fore-fraction tank 6 through the first pipe 3. The component collected in the middle stage of distillation is the middle-fraction, which enters the middle-fraction tank 7 through the second pipe 4. The component collected in the later stage of distillation is the finished product, which enters the finished product tank 8 through the third pipe 5. After freezing, filtration, and sedimentation, the final cyanoethyl ester product is obtained. The middle-fraction often contains some ethyl ester product. Therefore, this application uses water pump 8 to pump the middle-fraction from the middle-fraction tank 7 back into distillation vessel 1 and mix it with the crude product for redistillation, thereby recovering some of the ethyl ester product and improving the production rate of ethyl ester product.

[0019] Furthermore, the middle fraction tank 7 includes a tank body, with a feed inlet 71 at the top and a discharge outlet 72 at the bottom. A valve is installed at the discharge outlet 72, which is connected to the inlet of the water pump 8. The outlet of the water pump 8 is connected to the recovery port of the condenser 2. The middle fraction enters the middle fraction tank 7 through the feed inlet 71 for temporary storage; the water pump 8 then pumps the middle fraction from the middle fraction tank 7 back into the distillation kettle 1.

[0020] To prevent impurities from entering the middle fractionation tank 7, this application provides a cover at the top of the middle fractionation tank 7. The cover includes a cover plate 101, and a surrounding plate 102 is fixed around the cover plate 101. The surrounding plate 102 fits against the outer wall of the middle fractionation tank 7, and a sealing ring 14 is provided on the inner wall of the surrounding plate 102. The cover can be easily detached from the tank body, facilitating the installation and removal of the cover. At the same time, the sealing ring 14 ensures the sealing at the connection between the cover and the tank body. Correspondingly, a groove for accommodating the sealing ring is provided on the surrounding plate.

[0021] Furthermore, a filter screen 11 is fixed on the cover plate 101 and below the feed inlet 71. The filter screen is fixed to the cover plate by bolts and is used to further filter impurities.

[0022] Furthermore, the trough is fixed on the support leg 12, and the support leg 12 is provided with a mounting plate 13, on which the water pump 8 is fixed.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cyanoethyl ester distillation recovery system, characterized in that, The device includes a distillation kettle, the outlet of which is connected to the inlet of a condenser. The outlet of the condenser is connected to a first pipe, a second pipe, and a third pipe, which are arranged in parallel. The first pipe is connected to the front fractionation tank, the second pipe is connected to the middle fractionation tank, and the third pipe is connected to the finished product tank. The outlet of the middle fractionation tank is connected to the condenser via a water pump.

2. The cyanoethyl ester distillation recovery system according to claim 1, characterized in that, The middle fraction tank includes a tank body, with a feed inlet at the top and a discharge outlet at the bottom. A valve is installed at the discharge outlet, which is connected to the water inlet of a water pump, and the water outlet of the water pump is connected to the recovery port of a condenser.

3. The cyanoethyl ester distillation recovery system according to claim 2, characterized in that, The top of the middle fractionation tank is provided with a cover, which includes a cover plate and a surrounding plate fixed around the cover plate. The surrounding plate is in contact with the outer wall of the middle fractionation tank.

4. The cyanoethyl ester distillation recovery system according to claim 3, characterized in that, The inner wall of the enclosure is provided with a sealing ring.

5. The cyanoethyl ester distillation recovery system according to claim 3, characterized in that, A filter screen is fixed on the cover plate and below the feed inlet.

6. The cyanoethyl ester distillation recovery system according to claim 2, characterized in that, The tank is fixed to the support leg, the support leg is provided with a mounting plate, and the water pump is fixed to the mounting plate.

Images