CN219324205U - Device for continuously producing hydroxyacetonitrile by liquid method - Google Patents
Device for continuously producing hydroxyacetonitrile by liquid method Download PDFInfo
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- CN219324205U CN219324205U CN202320301135.6U CN202320301135U CN219324205U CN 219324205 U CN219324205 U CN 219324205U CN 202320301135 U CN202320301135 U CN 202320301135U CN 219324205 U CN219324205 U CN 219324205U
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- hydroxyacetonitrile
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The utility model provides a device for continuously producing hydroxyacetonitrile by a liquid method, which belongs to the technical field of chemical production and comprises a continuous reaction tank, a semi-finished product tank, a mixer and an external heat exchanger which are communicated through pipelines, wherein a discharge port of the mixer is communicated with a feed port of the continuous reaction tank through a pipeline, the external heat exchanger is connected between the discharge port at the bottom of the continuous reaction tank and a feed back port at the upper part of the continuous reaction tank through a pipeline, the external heat exchanger is also communicated with the feed port of the semi-finished product tank through a pipeline, and a hydrocyanic acid feed pipe and a formaldehyde feed pipe are arranged on the mixer. According to the device for continuously producing hydroxyacetonitrile by the liquid method, hydrocyanic acid and formaldehyde are mixed by the mixer and then are sent into the continuous reaction tank, and the external heat exchanger is combined for temperature control, so that the reaction time of the mixture can be shortened, the reaction efficiency is improved, and the production efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of chemical production, and particularly relates to a device for continuously producing hydroxyacetonitrile by a liquid method.
Background
Hydroxy acetonitrile is also called formaldehyde cyanohydrin or glycolonitrile, belongs to cyanohydrin, is an important fine chemical product, and is widely applied in the fields of chemical industry, dye, medicine, pesticide, mineral separation and the like. As the hydroxyacetonitrile is an important raw material for producing the pollution-free weeping agent glyphosate, is azo disperse dye manufactured by a cyanidation agent, is welcome by dye industry, and the demand of the hydroxyacetonitrile and derivatives thereof is continuously increased in various countries.
The prior hydroxyacetonitrile is mainly synthesized by taking formaldehyde and liquid HCN as raw materials in a reaction tank through reaction, the heat exchange of a jacket or a coil pipe is built in the reaction tank, the heat exchange area is limited, the heat exchange effect is poor, the residence time of the liquid in the reaction tank is long, the intermittent production is carried out, the reaction efficiency is low, and the production efficiency is low.
Disclosure of Invention
The embodiment of the utility model provides a device for continuously producing hydroxyacetonitrile by a liquid method, which aims to solve the problems of poor heat exchange effect, low reaction efficiency and low production efficiency of the existing hydroxyacetonitrile production device.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the device for continuously producing hydroxyacetonitrile by a liquid method comprises a continuous reaction tank and a semi-finished product tank which are communicated through pipelines, and further comprises: the device comprises a mixer and an external heat exchanger, wherein a discharge hole of the mixer is communicated with a feed inlet of the continuous reaction tank through a pipeline, the external heat exchanger is connected between the discharge hole at the bottom of the continuous reaction tank and a feed back hole at the upper part of the continuous reaction tank through a pipeline, the external heat exchanger is also communicated with the feed inlet of the semi-finished product tank through a pipeline, and a hydrocyanic acid feed pipe and a formaldehyde feed pipe are arranged on the mixer.
In one possible implementation manner, a distributor is arranged at the top of the mixer, and formaldehyde in the formaldehyde feeding pipe enters the mixer after passing through the distributor; the hydrocyanic acid feeding pipe is arranged on the side surface of the upper part of the mixer.
In one possible implementation manner, an end of the hydrocyanic acid feeding pipe, which extends into the mixer, is provided with an upward bent pipe, an umbrella cap is arranged at the upper end of the bent pipe, and the umbrella cap is located right below the distributor.
In one possible implementation manner, the lower end of the distributor is a round table with a large upper part and a small lower part, and a plurality of discharging holes are uniformly formed in the side wall of the round table.
In one possible implementation manner, a plurality of anchor-type flow guiding structures for enabling materials to flow reversely are further arranged in the mixer, and the anchor-type flow guiding structures are arranged along the height direction of the mixer.
In one possible implementation manner, the anchor-type flow guiding structure comprises a funnel and a flow guiding pipe arranged at the lower end of the funnel, the flow guiding pipe is a downward concave arc-shaped pipe, an outlet of the funnel is connected to the lowest point of the flow guiding pipe, and two outlets of the flow guiding pipe are higher than the outlet of the lower end of the funnel.
In one possible implementation manner, two guide pipes are arranged at the lower end of the funnel, and the two guide pipes are arranged in a crossing manner.
In one possible implementation, the inner wall of the continuous reaction tank is provided with a baffle plate, and the length direction of the baffle plate is consistent with the height direction of the semi-finished product tank.
In one possible embodiment, the baffle comprises two elongated strips arranged at an angle.
In one possible implementation manner, a sulfuric acid feeding pipe and a liquid alkali feeding pipe are further arranged on the continuous reaction tank.
Compared with the prior art, the device for continuously producing hydroxyacetonitrile by the liquid method has the beneficial effects that: after hydrocyanic acid and formaldehyde are mixed by a mixer, the contact reaction of the two raw materials is improved, the mixing uniformity of the two raw materials is improved, and the raw materials are sent into a continuous reaction tank, so that the reaction time in the continuous reaction tank can be shortened, the reaction efficiency is improved, and the production efficiency is improved; meanwhile, the temperature of the materials in the continuous reaction tank is controlled by adopting an external heat exchanger, the heat exchange area of the external heat exchanger is not limited by the continuous reaction tank, the heat exchange effect of the materials can be improved, the reaction residence time of the materials in the continuous reaction tank is shortened, the reaction efficiency is improved, and the production efficiency is improved; an external circulation is formed between the external heat exchanger and the continuous reaction tank, and the contact reaction of materials can be improved in the external circulation process, so that the reaction efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for continuously producing hydroxyacetonitrile by a liquid method according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a mixer according to an embodiment of the present utility model;
FIG. 3 is a schematic top view of the interior of the mixer provided in FIG. 2;
FIG. 4 is a schematic structural view of a continuous reaction tank according to an embodiment of the present utility model;
FIG. 5 is a schematic top view of the interior of the continuous reactor provided in FIG. 4;
fig. 6 is a schematic structural diagram of an external heat exchanger according to an embodiment of the present utility model;
reference numerals illustrate:
1. a mixer; 101. a formaldehyde feed tube; 102. hydrocyanic acid feeding pipe; 103. a distributor; 104. bending the pipe; 105. umbrella cap; 106. an anchor-type flow guiding structure; 1061. a funnel; 1062. a flow guiding pipe; 2. a continuous reaction tank; 201. a baffle plate; 202. reaction stirring paddles; 3. a semi-finished product tank; 301. a heat exchange coil; 302. semi-finished stirring paddles; 4. an external heat exchanger; 5. a communication pipe; 6. a flow meter; 7. a tail gas discharging main pipe; 8. nitrogen purge tube.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1, an apparatus for continuously producing hydroxyacetonitrile by the liquid process according to the present utility model will now be described. The device for continuously producing hydroxyacetonitrile by the liquid method comprises a continuous reaction tank 2, a semi-finished product tank 3, a mixer 1 and an external heat exchanger 4 which are communicated through pipelines, wherein a discharge port of the mixer 1 is communicated with a feed inlet of the continuous reaction tank 2 through a pipeline, the external heat exchanger 4 is connected between the discharge port at the bottom of the continuous reaction tank 2 and a feed back port at the upper part through a pipeline, the external heat exchanger 4 is also communicated with the feed inlet of the semi-finished product tank 3 through a pipeline, and a hydrocyanic acid feed pipe 102 and a formaldehyde feed pipe 101 are arranged on the mixer 1.
Compared with the prior art, the device for continuously producing hydroxyacetonitrile by the liquid method has the beneficial effects that: after hydrocyanic acid and formaldehyde are mixed by the mixer 1, the contact reaction of the two raw materials is improved, the mixing uniformity of the two raw materials is improved, and the raw materials are sent into the continuous reaction tank 2, so that the reaction time in the continuous reaction tank 2 can be shortened, the reaction efficiency is improved, and the production efficiency is improved; meanwhile, the temperature of the materials in the continuous reaction tank 2 is controlled by adopting the external heat exchanger 4, the heat exchange area of the external heat exchanger 4 is not limited by the continuous reaction tank 2, the heat exchange effect of the materials can be improved, the reaction residence time of the materials in the continuous reaction tank 2 is shortened, the reaction efficiency is improved, and the production efficiency is improved; an external circulation is formed between the external heat exchanger 4 and the continuous reaction tank 2, and the contact reaction of materials can be enhanced in the external circulation process, so that the reaction efficiency is improved.
The device comprises the preparation of hydroxy acetonitrile substrate, the preparation of continuous feeding reaction intermediate products and the preparation of finished products. The production process is as follows: adding a certain amount of formaldehyde into a continuous reaction tank 2, and then adding a certain amount of liquid hydrocyanic acid to prepare a substrate; mixing formaldehyde with liquid hydrocyanic acid in a certain proportion through a mixer 1 according to a set feeding proportion after preparing a substrate, and then entering a continuous reaction tank 2 for reaction to obtain a semi-finished product; and continuously collecting the semi-finished product into a semi-finished product tank 3, continuously collecting qualified finished product hydroxy acetonitrile in the semi-finished product tank 3 after finishing point adjustment, and conveying the finished product hydroxy acetonitrile into the finished product tank through a pipeline.
As shown in fig. 1, the device can be connected with a plurality of semi-finished product tanks 3 in parallel at the same time, and semi-finished products can be selectively fed into any semi-finished product tank 3 through the control of a valve, and a plurality of semi-finished product tanks 3 are arranged, wherein when one semi-finished product tank 3 fails, other semi-finished product tanks 3 can be used as spare parts, so that continuous production is ensured.
It should be noted that, on the communicating pipe or each feeding pipe, a valve, a flow meter 6, a check valve, a throttle valve, etc. may be provided according to the control requirement, which are all technical means known to those skilled in the art, and the number of valves in the figure is not one by one.
Wherein, a heat exchange coil 301 is arranged in the semi-finished product tank 3, and the temperature in the tank is regulated and controlled through the heat exchange coil 301; semi-finished product tank 3 is also provided with a semi-finished product stirring paddle 302 for stirring the materials in the tank.
Preferably, the communicating pipeline 5 between the continuous reaction tank 2 and the semi-finished product tank 3 is inclined downwards from the continuous reaction tank 2 to the semi-finished product tank 3, and by setting a certain inclination, the mixture reacted in the continuous reaction tank 2 is beneficial to flowing into the semi-finished product tank 3, so that no material is accumulated in the pipeline.
Preferably, as shown in fig. 6, the external heat exchanger 4 adopts upper and lower paths of cold water for cooling, so that the heat exchange effect of the external heat exchanger 4 is improved.
In some embodiments, as shown in fig. 2, the top of the mixer 1 is provided with a distributor 103, and formaldehyde in the formaldehyde feed pipe 101 enters the mixer 1 after passing through the distributor 103; the hydrocyanic acid feed pipe 102 is provided at the upper side of the mixer 1. Specifically, the formaldehyde feed inlet is above the hydrocyanic acid feed inlet, and formaldehyde is mixed with hydrocyanic acid from top to bottom after being distributed by the distributor 103, so that the effect of two kinds of mixing is improved.
In some embodiments, as shown in fig. 2, an end of the hydrocyanic acid feed pipe 102 extending into the mixer 1 is provided with a bending pipe 104 bent upwards, an umbrella cap 105 is arranged at the upper end of the bending pipe 104, and the umbrella cap 105 is positioned right below the distributor 103. After formaldehyde is distributed by the distributor 103, the formaldehyde is scattered downwards, and hydrocyanic acid is scattered downwards by shielding of the umbrella cap 105, so that two raw materials can be well mixed, the uniformity of mixing is improved, and the reaction efficiency is improved.
In some embodiments, as shown in fig. 2, the lower end of the distributor 103 is a truncated cone with a large top and a small bottom, and a plurality of discharging holes are uniformly formed on the side wall of the truncated cone. Formaldehyde is scattered and sprayed out through evenly arranged discharge holes on the distributor 103, so that the uniformity of raw material mixing is improved.
In some embodiments, as shown in fig. 2, a plurality of anchor-type diversion structures 106 for reversing the materials are further disposed in the mixer 1, and the anchor-type diversion structures 106 are disposed along the height direction of the mixer 1. After the materials in the mixer 1 are guided by the anchor type guide structure 106, the mixing time of the materials in the mixer 1 is prolonged, the materials have a certain backflow, the two materials can be fully mixed in the backflow process, and the mixing uniformity of the materials is improved.
Alternatively, the anchor baffle 106 and the distributor 103 may be used simultaneously or separately. For example, the distributor 103 and the anchor-type flow guiding structure 106 are arranged in the mixer 1 at the same time, formaldehyde enters the mixer 1 through the distributor 103 and contacts with liquid hydrocyanic acid, and in the downward blanking process, the formaldehyde is fully mixed after passing through the anchor-type flow guiding structure 106, so that the contact reaction of the two raw materials is improved, and the reaction efficiency is improved.
In some embodiments, as shown in fig. 2, the anchor-type flow guiding structure 106 includes a funnel 1061 and a flow guiding tube 1062 disposed at a lower end of the funnel 1061, the flow guiding tube 1062 is a concave arc tube, an outlet of the funnel 1061 is connected to a lowest point of the flow guiding tube 1062, and two outlets of the flow guiding tube 1062 are higher than outlets of a lower end of the funnel 1061. Materials enter the guide pipe 1062 downwards through the funnel 1061, are discharged from the outlet of the guide pipe 1062 higher than the outlet at the lower end of the funnel 1061 through the guide of the guide pipe 1062, fall down from a gap between the guide pipe 1062 and the inner wall of the mixer 1, fall into the funnel 1061 below, and repeatedly flow backwards repeatedly, so that the materials are fully mixed, and the uniformity of material mixing is greatly improved.
In some embodiments, as shown in fig. 2 and 3, two flow guiding pipes 1062 are disposed at the lower end of the funnel 1061, where the two flow guiding pipes 1062 are disposed in a crossing manner. The two honeycomb ducts 1062 have four outlets, and when guaranteeing the material mixing effect, promote the efficiency that the material mixes.
In some embodiments, as shown in fig. 4 and 5, baffles 201 are provided on the inner wall of the continuous reaction tank 2, and the length direction of the baffles 201 coincides with the height direction of the semi-finished tank 3. Specifically, the inner wall of the continuous reaction tank 2 is provided with a plurality of baffles 201 uniformly in the circumferential direction. The cooperation of the baffle plates 201 on the inner wall of the continuous reaction tank 2 and the reaction stirring paddles 202 can increase the turbulence effect of the feed liquid, improve the reaction efficiency, improve the reaction effect and shorten the production time.
In some embodiments, as shown in fig. 4 and 5, baffle 201 comprises two elongated plates arranged at an angle.
In some embodiments, as shown in fig. 1, a sulfuric acid feed pipe and a liquid alkali feed pipe are further arranged on the continuous reaction tank 2. Wherein, the semi-finished product tank 3 is also provided with a sulfuric acid feeding pipe, a liquid alkali feeding tank and a hydrocyanic acid feeding pipe 102 to prepare materials entering the semi-finished product tank 3, and qualified finished product hydroxyacetonitrile is produced.
As shown in fig. 1, the continuous reaction tank 2 and the semi-finished product tank 3 are further provided with exhaust pipes, and each exhaust pipe is integrated on an exhaust main pipe 7.
Preferably, as shown in fig. 1, the discharge pipelines of the continuous reaction tank 2 and the semi-finished product tank 3 are respectively provided with a nitrogen purging pipe 8 so as to ensure the safety of the reaction system through blowing in nitrogen.
By utilizing the device, materials are fully mixed by the mixer 1, can be discharged without staying after entering the continuous reaction tank 2, and enter the semi-finished product tank 3 to finally form a finished product by exchanging heat by the external heat exchanger 4, and the finished product is stored in the finished product tank. The design of the reaction process greatly improves the reaction efficiency and the reaction effect and shortens the production time of the hydroxy acetonitrile.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The device for continuously producing hydroxyacetonitrile by a liquid method comprises a continuous reaction tank (2) and a semi-finished product tank (3) which are communicated through a pipeline, and is characterized by further comprising: the device comprises a mixer (1) and an external heat exchanger (4), wherein a discharge hole of the mixer (1) is communicated with a feed inlet of a continuous reaction tank (2) through a pipeline, the external heat exchanger (4) is connected between the discharge hole at the bottom of the continuous reaction tank (2) and a feed back hole at the upper part through a pipeline, the external heat exchanger (4) is also communicated with the feed inlet of a semi-finished product tank (3) through a pipeline, and a hydrocyanic acid feed pipe (102) and a formaldehyde feed pipe (101) are arranged on the mixer (1).
2. The device for continuously producing hydroxyacetonitrile by using the liquid method according to claim 1, wherein a distributor (103) is arranged at the top of the mixer (1), and formaldehyde in the formaldehyde feeding pipe (101) enters the mixer (1) after passing through the distributor (103); the hydrocyanic acid feeding pipe (102) is arranged on the side surface of the upper part of the mixer (1).
3. The device for continuously producing hydroxyacetonitrile by using the liquid method according to claim 2, wherein one end of the hydrocyanic acid feeding pipe (102) extending into the mixer (1) is provided with a bending pipe (104) which is bent upwards, the upper end of the bending pipe (104) is provided with an umbrella cap (105), and the umbrella cap (105) is positioned under the distributor (103).
4. The device for continuously producing hydroxyacetonitrile by using the liquid method according to claim 2, wherein the lower end of the distributor (103) is a round table with a large upper part and a small lower part, and a plurality of discharging holes are uniformly formed in the side wall of the round table.
5. The device for continuously producing hydroxyacetonitrile by using the liquid method according to claim 1, wherein a plurality of anchor-type flow guiding structures (106) for flowing materials reversely are further arranged in the mixer (1), and the anchor-type flow guiding structures (106) are arranged along the height direction of the mixer (1).
6. The apparatus for continuously producing hydroxyacetonitrile according to claim 5, wherein the anchor type flow guiding structure (106) comprises a funnel (1061) and a flow guiding pipe (1062) arranged at the lower end of the funnel (1061), the flow guiding pipe (1062) is a downward concave arc pipe, an outlet of the funnel (1061) is connected to the lowest point of the flow guiding pipe (1062), and two outlets of the flow guiding pipe (1062) are higher than an outlet at the lower end of the funnel (1061).
7. The device for continuously producing hydroxyacetonitrile by using the liquid process according to claim 6, wherein two flow guiding pipes (1062) are arranged at the lower end of the funnel (1061), and the two flow guiding pipes (1062) are arranged in a crossing manner.
8. The apparatus for continuously producing hydroxyacetonitrile by the liquid process according to claim 1, wherein a baffle plate (201) is provided on the inner wall of the continuous reaction tank (2), and the length direction of the baffle plate (201) is identical to the height direction of the semi-finished product tank (3).
9. The apparatus for the continuous production of hydroxyacetonitrile in a liquid process according to claim 8 wherein the baffle (201) comprises two elongated plates arranged at an angle.
10. The device for continuously producing hydroxyacetonitrile by the liquid process according to claim 1, wherein a sulfuric acid feed pipe and a liquid alkali feed pipe are further arranged on the continuous reaction tank (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320301135.6U CN219324205U (en) | 2023-02-23 | 2023-02-23 | Device for continuously producing hydroxyacetonitrile by liquid method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320301135.6U CN219324205U (en) | 2023-02-23 | 2023-02-23 | Device for continuously producing hydroxyacetonitrile by liquid method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219324205U true CN219324205U (en) | 2023-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320301135.6U Active CN219324205U (en) | 2023-02-23 | 2023-02-23 | Device for continuously producing hydroxyacetonitrile by liquid method |
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| CN (1) | CN219324205U (en) |
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2023
- 2023-02-23 CN CN202320301135.6U patent/CN219324205U/en active Active
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