Novel cyanoacetic acid dehydration device

Abstract

The utility model relates to the technical field of dehydration, and discloses a novel cyanoacetic acid dehydration device which comprises an incoming material input pump, the incoming material input pump is connected with a preheating mechanism through a pipeline, the preheating mechanism comprises a water storage tank, an electrical bar, a flow guide pipe, a spherical shell and heat collection fins, the electrical bar is installed in the water storage tank, the flow guide pipe is installed in the water storage tank, and the spherical shell is installed in the spherical shell. The left end of the flow guide pipe is connected with the incoming material input pump through a pipeline, the right end of the flow guide pipe is connected with an inlet of the horizontal film evaporator through a pipeline, a plurality of spherical shells are arranged on the flow guide pipe, a steam outlet is formed in the upper right portion of the horizontal film evaporator, and a concentrated solution outlet is formed in the lower right portion of the horizontal film evaporator. The steam outlet is connected with an inlet of the first-stage condenser through a pipeline, and an outlet of the first-stage condenser is connected with an inlet of the second-stage condenser through a pipeline. According to the cyanoacetic acid dehydration device, cyanoacetic acid is preheated firstly, and then the film evaporator is used for rapidly dehydrating the cyanoacetic acid, so that moisture in the cyanoacetic acid is conveniently, rapidly and fully removed.

Description

Technical Field

[0001] The utility model relates to the technical field of dehydration, in particular to a novel cyanoacetic acid dehydration device. Background Art

[0002] The condensation reaction involving cyanoacetic acid must be carried out under anhydrous conditions. The raw cyanoacetic acid typically has a water content of 30%, requiring dehydration before the reaction. Current plants employ a two-stage, single-tank vacuum distillation process: a first stage for distilling water under reduced pressure, and a second stage for extracting the acid and water from the condensed acid. These processes are connected by an overflow pipe. This results in a high end-point moisture content, which can only be maintained at around 2%, resulting in low efficiency for subsequent condensation reactions. Furthermore, factors such as the long residence time of cyanoacetic acid during the extraction process and large vacuum fluctuations can cause some cyanoacetic acid to decompose, leading to high cyanoacetic acid consumption. Furthermore, single-tank evaporation efficiency is low, resulting in high steam consumption. Therefore, in response to these current circumstances, there is an urgent need to develop a novel cyanoacetic acid dehydration device that preheats the cyanoacetic acid and then rapidly dehydrates it using a thin-film evaporator, facilitating rapid and comprehensive water removal. This would overcome the shortcomings of current practical applications and meet current needs. Utility Model Content

[0003] The purpose of the utility model is to provide a novel cyanoacetic acid dehydration device to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A novel cyanoacetic acid dehydration device comprises a feed input pump, a preheating mechanism, a horizontal thin film evaporator, a primary condenser, a secondary condenser, a water collecting tank, a concentrated liquid collecting tank and a discharge pump. The feed input pump is connected to the preheating mechanism through a pipeline.

[0006] Preferably: the preheating mechanism includes: a water tank, an electric heating rod, a guide tube, a spherical shell and heat collecting fins, the water tank is installed with an electric heating rod, the water tank is installed with a guide tube, the left end of the guide tube is connected to the incoming material input pump through a pipeline, the right end of the guide tube is connected to the inlet of the horizontal thin film evaporator through a pipeline, a plurality of spherical shells are provided on the guide tube, and a plurality of heat collecting fins are fixed to the outside of each of the spherical shells.

[0007] Preferably: a steam outlet is provided at the upper right and a concentrated liquid outlet is provided at the lower right of the horizontal thin film evaporator, the steam outlet is connected to the inlet of the first-stage condenser through a pipe, the outlet of the first-stage condenser is connected to the inlet of the second-stage condenser through a pipe, the outlet of the second-stage condenser is connected to the water collecting tank through a pipe, and the concentrated liquid outlet is connected to the concentrated liquid collecting tank through a pipe.

[0008] Preferably, a drainage pump connected to the water collecting tank is installed on one side of the water collecting tank.

[0009] Preferably, the guide tube, the spherical shell and the heat collecting fins are all made of copper.

[0010] Preferably, a discharge pump connected to the concentrate collection box is installed on one side.

[0011] Preferably, a liquid level sensor extending into the interior of the concentrate collection box is installed on the concentrate collection box.

[0012] The beneficial effects of the present utility model are as follows: the novel cyanoacetic acid dehydration device, when in use, heats water in a water storage tank by an electric heating rod, transports the water-containing cyanoacetic acid into a flow guide pipe by an incoming material input pump, increases the contact area with the water by a spherical shell, and concentrates the heat in the water onto the spherical shell by a plurality of heat collecting fins, so as to quickly preheat the liquid passing through the spherical shell (to -°C), thereby facilitating the subsequent rapid evaporation of water. The liquid then enters a horizontal thin film evaporator, where the water in the preheated liquid is rapidly evaporated, while the remaining cyanoacetic acid flows into a concentrated liquid collection tank and is collected, thereby fully removing the water in the cyanoacetic acid. The water vapor is discharged from the steam outlet and sequentially enters a primary condenser and a secondary condenser for secondary condensation, and the condensed water is collected in the water collection tank. In summary, the present utility model first preheats the cyanoacetic acid and then uses a thin film evaporator to quickly dehydrate the cyanoacetic acid, thereby facilitating the rapid and sufficient removal of water in the cyanoacetic acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Figure 2 This is an internal cross-sectional view of the preheating mechanism in the present invention.

[0015] Figure 3 It is a partial structural diagram of the utility model.

[0016] Legend:

[0017] 1. Incoming material input pump; 2. Preheating mechanism; 201. Water storage tank; 202. Electric heating rod; 203. Draft tube; 204. Spherical shell; 205. Heat collecting fins; 3. Horizontal thin film evaporator; 301. Steam outlet; 302. Concentrate outlet; 4. Primary condenser; 5. Secondary condenser; 6. Water collecting tank; 7. Drain pump; 8. Concentrate collecting tank; 9. Discharge pump; 10. Liquid level sensor. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Specific examples are given below.

[0020] See also Figures 1 to 3 In the embodiment of the present invention, a novel cyanoacetic acid dehydration device includes a feed input pump 1, a preheating mechanism 2, a horizontal thin film evaporator 3, a primary condenser 4, a secondary condenser 5, a water collecting tank 6, a concentrate collecting tank 8 and a discharge pump 9. The feed input pump 1 is connected to a feed tank storing cyanoacetic acid, and the feed input pump 1 is connected to the preheating mechanism 2 through a pipeline. The preheating mechanism 2 includes: a water storage tank 201, an electric heating rod 202, a flow guide pipe 203, a spherical shell 204 and a heat collecting fin 205. Water is stored in the water storage tank 201. An electric heating rod 202 is installed in 201, and a guide pipe 203 is installed in the water tank 201. The left end of the guide pipe 203 is connected to the incoming material input pump 1 through a pipeline, and the right end of the guide pipe 203 is connected to the inlet of the horizontal thin film evaporator 3 through a pipeline (the horizontal thin film evaporator 3 is a prior art. The thin film evaporator is a type of evaporator with the advantages of high heat transfer efficiency, fast evaporation speed, and short material residence time). A plurality of spherical shells 204 are provided on the guide pipe 203. The surface area is increased by the arrangement of the spherical shells 204, which is convenient for increasing the heat Exchange efficiency, a plurality of heat collecting fins 205 are fixed on the outside of each spherical shell 204, and the heat is concentrated on the spherical shell 204 through the plurality of heat collecting fins 205, so as to quickly preheat the liquid passing through the spherical shell 204. A steam outlet 301 is provided at the upper right of the horizontal thin film evaporator 3, and a concentrated liquid outlet 302 is provided at the lower right. The steam outlet 301 is connected to the inlet of the first-stage condenser 4 through a pipe, and the outlet of the first-stage condenser 4 is connected to the inlet of the second-stage condenser 5 through a pipe, and the outlet of the second-stage condenser 5 is connected to the The water collecting tank 6 is connected, and a drainage pump 7 connected to it is installed on one side of the water collecting tank 6. The water collected in the water collecting tank 6 can be discharged through the drainage pump 7. The concentrate outlet 302 is connected to the concentrate collecting tank 8 through a pipeline. A discharge pump 9 connected to it is installed on one side of the concentrate collecting tank 8. A liquid level sensor 10 extending into the interior of the concentrate collecting tank 8 is installed. The amount of liquid in the concentrate collecting tank 8 is detected by the liquid level sensor 10. When the concentrate collecting tank 8 squeezes too much liquid, the concentrate is output through the discharge pump 9.

[0021] The flow guide tube 203, the spherical shell 204 and the heat collecting fins 205 are all made of copper, so that they have good thermal conductivity.

[0022] Working principle: When the new cyanoacetic acid dehydration device is in use, the water in the water tank 201 is heated by the electric heating rod 202, and the water-containing cyanoacetic acid is transported to the guide pipe 203 through the incoming material input pump 1. The contact area with the water is increased by the spherical shell 204, and the heat in the water is concentrated on the spherical shell 204 through multiple heat collecting fins 205, so as to quickly preheat the liquid passing through the spherical shell 204 (heated to 40-50°C) for subsequent rapid evaporation of water. Then, the liquid enters the horizontal thin film evaporator 3, and the water in the preheated liquid is quickly evaporated by the horizontal thin film evaporator 3, and the remaining cyanoacetic acid flows into the concentrated liquid collection box 8 and is collected, thereby fully removing the water in the cyanoacetic acid. The water vapor is discharged from the steam outlet 301 and enters the primary condenser 4 and the secondary condenser 5 in sequence for secondary condensation. The condensed water is collected by the water collecting tank 6.

[0023] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A novel cyanoacetic acid dehydration device, characterized in that: The invention comprises a material input pump (1), a preheating mechanism (2), a horizontal thin film evaporator (3), a primary condenser (4), a secondary condenser (5), a water collecting tank (6), a concentrated liquid collecting tank (8) and a discharge pump (9); the material input pump (1) is connected to the preheating mechanism (2) through a pipeline.

2. The novel cyanoacetic acid dehydration device according to claim 1, characterized in that: The preheating mechanism (2) comprises: a water storage tank (201), an electric heating rod (202), a flow guide pipe (203), a spherical shell (204) and heat collecting fins (205); the water storage tank (201) is provided with an electric heating rod (202); the water storage tank (201) is provided with a flow guide pipe (203); the left end of the flow guide pipe (203) is connected to the incoming material input pump (1) through a pipeline; the right end of the flow guide pipe (203) is connected to the inlet of the horizontal thin film evaporator (3) through a pipeline; a plurality of spherical shells (204) are provided on the flow guide pipe (203); and a plurality of heat collecting fins (205) are fixed on the outer side of each of the spherical shells (204).

3. The novel cyanoacetic acid dehydration device according to claim 1, characterized in that: The horizontal thin film evaporator (3) is provided with a steam outlet (301) at the upper right and a concentrated liquid outlet (302) at the lower right. The steam outlet (301) is connected to the inlet of the primary condenser (4) through a pipeline. The outlet of the primary condenser (4) is connected to the inlet of the secondary condenser (5) through a pipeline. The outlet of the secondary condenser (5) is connected to the water collecting tank (6) through a pipeline. The concentrated liquid outlet (302) is connected to the concentrated liquid collecting tank (8) through a pipeline.

4. The novel cyanoacetic acid dehydration device according to claim 3, characterized in that: A drainage pump (7) connected to the water collecting tank (6) is installed on one side.

5. The novel cyanoacetic acid dehydration device according to claim 2, characterized in that: The flow guide tube (203), the spherical shell (204) and the heat collecting fins (205) are all made of copper.

6. The novel cyanoacetic acid dehydration device according to claim 3, characterized in that: A discharge pump (9) connected to the concentrate collecting box (8) is installed on one side.

7. The novel cyanoacetic acid dehydration device according to claim 3, characterized in that: The concentrated liquid collecting box (8) is provided with a liquid level sensor (10) extending into the interior thereof.

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