A device for preparing and purifying hydrogen cyanide

Abstract

The utility model relates to the technical field of stamping trimming dies, and discloses a hydrogen cyanide preparation and purification device, including an absorption box, the upper end of the side wall of the absorption box is provided with a water pipe extending toward the inside of the absorption box, the lower end of the side wall of the absorption box is provided with a discharge pipe for discharging hydrocyanic acid liquid outward, the inside of the absorption box has a self-rotating shunt structure, the mouth of the water pipe faces the shunt structure, and the side wall of the absorption box has an air supply structure located between the water pipe and the discharge pipe, the air supply structure extends into the absorption box, and sprays hydrogen cyanide tail gas toward the shunt structure. The utility model can improve the purity of the extracted hydrogen cyanide product.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen cyanide production, in particular to a hydrogen cyanide preparation and purification device. Background Art

[0002] Hydrogen cyanide is an important chemical. Its production process can be divided into methane ammoxidation method (Angervois method), methanol ammoxidation method, BMA method, formamide thermal dehydration method, light oil cracking method and acrylonitrile by-product method according to the raw materials used. In the process of producing hydrogen cyanide using these technologies, the basic principle is to use methane, methanol and other reaction raw materials to react with ammonia to generate hydrogen cyanide. The reaction product after the reaction contains a large amount of unreacted ammonia and other reaction raw materials and by-product impurities. These impurities must be removed to obtain pure hydrogen cyanide products.

[0003] Our company often uses the methane ammonia oxidation method (Anscher method) to produce hydrogen cyanide, and the reaction products produced by the reaction of methane and ammonia are purified and impurity-removed. The purification and impurity-removal process mainly includes deamination, hydrogen cyanide absorption, hydrocyanic acid (hydrogen cyanide aqueous solution) distillation (including rough distillation and fine distillation) and tail gas absorption, that is, firstly, the ammonia in the reaction product that is miscible with hydrogen cyanide and difficult to remove is removed by sulfuric acid deamination and other methods, and then the hydrogen cyanide in the reaction product is absorbed by water or dilute hydrocyanic acid solution to obtain a relatively concentrated hydrocyanic acid solution, and at the same time, impurities such as methane that are insoluble in the hydrocyanic acid solution are removed, and then the hydrocyanic acid solution is purified and refined by distillation to obtain a pure hydrogen cyanide product.

[0004] According to the above process requirements, the deamination process needs to use deamination equipment to treat ammonia with sulfuric acid, the hydrogen cyanide absorption process needs to use hydrogen cyanide absorption equipment to absorb hydrogen cyanide in the reaction product, the hydrocyanic acid distillation process needs to use hydrocyanic acid distillation equipment to distill, and the tail gas absorption process needs to use tail gas absorption equipment to contact hydrogen cyanide in the reaction product with alkaline water for tail gas absorption. However, the existing tail gas absorption equipment has a large volume of tail gas discharged continuously, and the hydrogen cyanide in the middle of the bubble is not fully in contact with the alkaline water for absorption, which affects the dissolution rate and absorption efficiency of hydrogen cyanide, resulting in insufficient purity of the hydrogen cyanide product. Utility Model Content

[0005] The utility model aims to provide a hydrogen cyanide preparation and purification device, which can improve the purity of the extracted hydrogen cyanide product.

[0006] To achieve the above objectives, various aspects of the present application can be implemented in one or more of the following embodiments:

[0007] 1) A hydrogen cyanide preparation and purification device, comprising an absorption box, wherein the upper end of the side wall of the absorption box is provided with a water pipe extending toward the inside of the absorption box, and the lower end of the side wall of the absorption box is provided with a discharge pipe for discharging hydrogen cyanide liquid to the outside, and the interior of the absorption box has a self-rotating diversion structure, the pipe mouth of the water pipe faces the diversion structure, and the side wall of the absorption box has an air supply structure located between the water pipe and the discharge pipe, and the air supply structure extends into the absorption box and sprays hydrogen cyanide tail gas toward the diversion structure.

[0008] The utility model injects alkaline water into the absorption box through a water pipe. Since the pipe mouth of the water pipe faces the diversion structure, the alkaline water injected by the water pipe is sprayed on the diversion structure. At the same time, the gas supply structure synchronously sprays the hydrogen cyanide tail gas on the diversion structure. When the alkaline water and the hydrogen cyanide tail gas are synchronously sprayed on the self-rotating diversion structure, the diversion structure drives the alkaline water and the hydrogen cyanide tail gas to rotate in the absorption box. During the rotation process, the alkaline water and the hydrogen cyanide tail gas are fully in contact with each other, which promotes the dissolution speed of hydrogen cyanide in the hydrogen cyanide tail gas to be accelerated and the absorption efficiency to be improved, thereby forming hydrocyanic acid liquid. The hydrocyanic acid liquid is transported to the hydrocyanic acid distillation equipment through the discharge pipe. The hydrocyanic acid distillation equipment performs distillation treatment on the hydrocyanic acid liquid again, thereby improving the purity of the hydrogen cyanide product.

[0009] 2) A hydrogen cyanide preparation and purification device according to 1), wherein:

[0010] The diversion structure includes a pillar arranged at the bottom of the absorption box and capable of self-rotation. A pointed column is fixed on the top of the pillar. The top of the pointed column is a pointed structure and faces the pipe mouth of the water pipe. A plurality of blades evenly distributed around the circumference of the pillar are arranged around the bottom of the pointed column.

[0011] When the water pipe sprays alkaline water into the absorption box, the alkaline water will first contact the top of the pointed column, and the pointed column will have a diversion effect on the alkaline water; at the same time, the self-rotating pillar drives the pointed column to rotate, and during the rotation of the pointed column, the diverted alkaline water will be thrown around; at the same time, the thrown alkaline water will be quickly cut by the blades that rotate with the rotation of the pillar in the process of falling down, so that the cut part of the water flow will rotate again with the pillar. In this way, the alkaline water transported by the delivery pipe is subjected to the force that changes its motion trajectory many times in the absorption box, so that the alkaline water and hydrogen cyanide exhaust gas are fully in contact, which promotes the dissolution rate of hydrogen cyanide in the hydrogen cyanide exhaust gas and improves the absorption efficiency.

[0012] 3) A hydrogen cyanide preparation and purification device according to 2), wherein:

[0013] The diversion structure also includes a rotating disk rotatably connected to the bottom of the box body, the upper surface of the rotating disk is fixedly connected to the bottom of the support, and the lower surface of the rotating disk is connected to the output shaft of the driving motor arranged below the absorption box body.

[0014] In this solution, the output shaft of the driving motor is connected to the shaft on the lower surface of the rotating disk, so as to drive the rotating disk to rotate, and the rotating disk drives the support to rotate, thereby realizing the self-rotating rotation of the entire diversion structure.

[0015] 4) A hydrogen cyanide preparation and purification device according to 1), wherein:

[0016] The air supply structure includes an annular tube sleeved on the outer surface of the absorption box, the annular tube is connected to several air inlet pipes extending toward the inside of the absorption box, the pipe openings of the air inlet pipes face the upper surface of the blades of the diversion structure, and the annular tube is also connected to an air supply pipe for injecting hydrogen cyanide tail gas into the annular tube.

[0017] In this scheme, an annular tube is sleeved on the outer surface of the absorption box, and several air inlet pipes on the annular tube are used to synchronously inject hydrogen cyanide exhaust gas into the absorption box, so that the hydrogen cyanide exhaust gas enters the absorption box synchronously along the circumferential direction of the absorption box, and the hydrogen cyanide exhaust gas entering the absorption box is sprayed on the blades of the diversion structure. At this time, the impact force of the hydrogen cyanide exhaust gas spray first contacts the alkaline water on the blades of the diversion structure and drives the flow of the alkaline water. At the same time, the hydrogen cyanide exhaust gas moves with the rotation of the diversion structure, fully contacts with the alkaline water to react, thereby promoting the dissolution rate of hydrogen cyanide in the hydrogen cyanide exhaust gas and improving the absorption efficiency.

[0018] 5) A hydrogen cyanide preparation and purification device according to 2), wherein:

[0019] The longitudinal section of the water delivery pipe is in the shape of a "┌", and the pipe mouth of the water delivery pipe is provided with a nozzle facing the top of the pointed column. The nozzle enables the alkaline water to obtain a high-speed airflow during the spraying process and impact the top of the pointed column, generating a large impact force, so that the alkaline water can be ejected to the surrounding side, so that the alkaline water is in full contact with the hydrogen cyanide in the hydrogen cyanide tail gas.

[0020] 6) A hydrogen cyanide preparation and purification device according to 1), wherein:

[0021] A base is provided at the bottom of the absorption box, and the base is used to support the absorption box.

[0022] 7) A hydrogen cyanide preparation and purification device according to 1), wherein:

[0023] The top of the absorption box is provided with an exhaust pipe extending upwards, and the exhaust pipe is connected to the absorption box. The exhaust pipe provided by the utility model is convenient for the gas insoluble in alkaline water in the hydrogen cyanide tail gas to rise and then be discharged from the exhaust pipe to high altitude.

[0024] Compared with the prior art, the utility model also has the following technical effects:

[0025] In the utility model, hydrogen cyanide tail gas enters the absorption box through the air inlet pipe and is dispersedly sprayed on the upper surface of the blades. During the rotation of the blades, the movement of the hydrogen cyanide tail gas is driven; at the same time, the alkaline water sprayed by the water pipe moves synchronously, so that the alkaline water and the hydrogen cyanide in the hydrogen cyanide tail gas are more fully contacted, thereby improving the dissolution speed and efficiency of the hydrogen cyanide. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The utility model is a schematic diagram of the structure of a hydrogen cyanide preparation and purification device. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The figure marks in the drawings of the specification include: absorption box 1, base 2, exhaust pipe 3, water pipe 4, annular pipe 5, discharge pipe 6, flow valve 7, air inlet pipe 8, air supply pipe 9, nozzle 10, pointed column 11, support 12, rotating disk 13, drive motor 14, and blades 15.

[0029] Reference will now be made in detail to the embodiments disclosed in the present invention, examples of which are described herein and illustrated in the accompanying drawings. Although the present invention will be described in conjunction with the embodiments and / or examples, they do not limit the present invention to these embodiments and / or examples. On the contrary, the present invention discloses alternatives, modifications and equivalents.

[0030] In e.g. Figure 1 In the generally shown embodiment, a hydrogen cyanide preparation and purification device in the utility model comprises an absorption box 1, and an exhaust pipe 3 extending upward is provided on the top of the absorption box 1, and the exhaust pipe 3 is connected to the absorption box 1. The exhaust pipe 3 provided in the utility model facilitates the gas insoluble in alkaline water in the hydrogen cyanide tail gas to rise and then be discharged to high altitude from the exhaust pipe 3. A base 2 is provided at the bottom of the absorption box 1, and the base 2 is used to support the absorption box 1.

[0031] A water pipe 4 extending toward the inside of the absorption box 1 is provided at the upper end of the side wall of the absorption box 1, and a discharge pipe 6 for discharging hydrogen cyanide liquid to the outside is provided at the lower end of the side wall of the absorption box 1. The interior of the absorption box 1 has a self-rotating diversion structure, and the mouth of the water pipe 4 faces the diversion structure. An air supply structure located between the water pipe 4 and the discharge pipe 6 is provided on the side wall of the absorption box 1. The air supply structure extends into the absorption box 1 and sprays hydrogen cyanide tail gas toward the diversion structure.

[0032] The utility model injects alkaline water into the absorption box 1 through the water pipe 4. Since the mouth of the water pipe 4 faces the diversion structure, the alkaline water injected by the water pipe 4 is sprayed on the diversion structure. At the same time, the gas supply structure synchronously sprays the hydrogen cyanide tail gas on the diversion structure. When the alkaline water and the hydrogen cyanide tail gas are synchronously sprayed on the self-rotating diversion structure, the diversion structure drives the alkaline water and the hydrogen cyanide tail gas to rotate in the absorption box 1. During the rotation process, the alkaline water and the hydrogen cyanide tail gas are fully in contact with each other, which promotes the dissolution rate of hydrogen cyanide in the hydrogen cyanide tail gas to be accelerated and the absorption efficiency to be improved, thereby forming hydrocyanic acid liquid. The hydrocyanic acid liquid is transported to the hydrocyanic acid distillation equipment through the discharge pipe 6. The hydrocyanic acid distillation equipment performs distillation treatment on the hydrocyanic acid liquid again, thereby improving the purity of the hydrogen cyanide product.

[0033] Among them: the diversion structure includes a pillar 12 which is arranged at the bottom of the absorption box 1 and can rotate. A pointed column 11 is fixed on the top of the pillar 12. The top of the pointed column 11 is a pointed structure and faces the pipe mouth of the water pipe 4. A plurality of blades 15 are evenly distributed around the circumference of the pillar 12 on the circumferential side of the bottom of the pointed column 11.

[0034] When the water pipe 4 sprays alkaline water into the absorption box 1, the alkaline water will first contact the top of the pointed column 11, and the pointed column 11 will have a diversion effect on the alkaline water; at the same time, the self-rotating support 12 drives the pointed column 11 to rotate, and the diverted alkaline water will be thrown around during the rotation of the pointed column 11; at the same time, the thrown alkaline water will be quickly cut by the blades 15 that rotate with the rotation of the support 12 during the process of falling, so that the cut part of the water flow will rotate again with the support 12. In this way, the alkaline water transported by the delivery pipe is subjected to the force that changes its motion trajectory many times in the absorption box 1, so that the alkaline water is fully in contact with the hydrogen cyanide tail gas, which promotes the dissolution rate of hydrogen cyanide in the hydrogen cyanide tail gas and improves the absorption efficiency.

[0035] Secondly, the flow-dividing structure further includes a rotating disk 13 rotatably connected to the bottom of the box body, the upper surface of the rotating disk 13 is fixedly connected to the bottom of the support 12, and the lower surface of the rotating disk 13 is axially connected to the output shaft of the driving motor 14 arranged below the absorption box body 1. The output shaft of the driving motor 14 is axially connected to the lower surface of the rotating disk 13 to drive the rotating disk 13 to rotate, and the rotating disk 13 drives the support 12 to rotate, thereby realizing the self-rotating rotation of the entire flow-dividing structure.

[0036] In addition, the longitudinal section of the water delivery pipe 4 is in the shape of a "┌", and the pipe mouth of the water delivery pipe 4 is provided with a nozzle 10 facing the top of the pointed column 11. The nozzle 10 allows the alkaline water to obtain a high-speed airflow during the spraying process, and impacts the top of the pointed column 11, generating a large impact force, so that the alkaline water can be ejected to the surrounding side, which is convenient for the alkaline water to fully contact with the hydrogen cyanide in the hydrogen cyanide tail gas.

[0037] See also Figure 1 As shown, the air supply structure includes an annular tube 5 which is sleeved on the outer surface of the absorption box 1. The annular tube 5 is connected to several air inlet pipes 8 extending toward the inside of the absorption box 1. The pipe openings of the air inlet pipes 8 face the upper surfaces of the blades 15 of the diversion structure. The annular tube 5 is also connected to an air supply pipe 9 for injecting hydrogen cyanide tail gas into the annular tube 5.

[0038] In this scheme, an annular tube 5 is sleeved on the outer surface of the absorption box 1, and several air inlet pipes 8 on the annular tube 5 are used to synchronously inject hydrogen cyanide tail gas into the absorption box 1, so that the hydrogen cyanide tail gas synchronously enters the absorption box 1 along the circumferential direction of the absorption box 1, and the hydrogen cyanide tail gas entering the absorption box 1 is sprayed on the blades 15 of the diversion structure. At this time, the impact force of the hydrogen cyanide tail gas spray first contacts the alkaline water on the blades 15 of the diversion structure, and drives the flow of the alkaline water. At the same time, the hydrogen cyanide tail gas moves with the rotation of the diversion structure, fully contacts with the alkaline water to react, and promotes the dissolution rate of hydrogen cyanide in the hydrogen cyanide tail gas and improves the absorption efficiency.

[0039] In the utility model, hydrogen cyanide tail gas enters the absorption box 1 through the air inlet pipe 8 and is dispersedly sprayed on the upper surface of the blades 15. During the rotation of the blades 15, the movement of the hydrogen cyanide tail gas is driven; at the same time, the alkaline water sprayed from the water pipe 4 moves synchronously, so that the alkaline water and the hydrogen cyanide in the hydrogen cyanide tail gas are more fully contacted, thereby improving the dissolution speed and efficiency of the hydrogen cyanide.

[0040] The above are only embodiments of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A hydrogen cyanide preparation and purification device, comprising an absorption box, wherein the upper end of the side wall of the absorption box is provided with a water pipe extending toward the inside of the absorption box, and the lower end of the side wall of the absorption box is provided with a discharge pipe for discharging hydrogen cyanide liquid outward, characterized in that: The interior of the absorption box has a self-rotating diversion structure, the mouth of the water pipe is facing the diversion structure, and the side wall of the absorption box has an air supply structure located between the water pipe and the discharge pipe. The air supply structure extends into the absorption box and sprays hydrogen cyanide tail gas toward the diversion structure.

2. A hydrogen cyanide preparation and purification device according to claim 1, characterized in that: The diversion structure includes a pillar arranged at the bottom of the absorption box and capable of self-rotation. A pointed column is fixed on the top of the pillar. The top of the pointed column is a pointed structure and faces the pipe mouth of the water pipe. A plurality of blades evenly distributed around the circumference of the pillar are arranged around the bottom of the pointed column.

3. A hydrogen cyanide preparation and purification device according to claim 2, characterized in that: The diversion structure also includes a rotating disk rotatably connected to the bottom of the box body, the upper surface of the rotating disk is fixedly connected to the bottom of the support, and the lower surface of the rotating disk is connected to the output shaft of the driving motor arranged below the absorption box body.

4. The hydrogen cyanide preparation and purification device according to claim 1, characterized in that: The air supply structure includes an annular tube sleeved on the outer surface of the absorption box, the annular tube is connected to several air inlet pipes extending toward the inside of the absorption box, the pipe openings of the air inlet pipes face the upper surface of the blades of the diversion structure, and the annular tube is also connected to an air supply pipe for injecting hydrogen cyanide tail gas into the annular tube.

5. The hydrogen cyanide preparation and purification device according to claim 2, characterized in that: The longitudinal section of the water delivery pipe is in a "┌" shape, and the pipe mouth of the water delivery pipe is provided with a nozzle facing the top of the pointed column.

6. The hydrogen cyanide preparation and purification device according to claim 1, characterized in that: A base is provided at the bottom of the absorption box, and the base is used to support the absorption box.

7. The hydrogen cyanide preparation and purification device according to claim 1, characterized in that: An exhaust pipe extending upward is arranged on the top of the absorption box body, and the exhaust pipe is communicated with the absorption box body.

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