CN216573122U - Production equipment for melting and converting ammonium thiocyanate into thiourea - Google Patents
Production equipment for melting and converting ammonium thiocyanate into thiourea Download PDFInfo
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- CN216573122U CN216573122U CN202122595587.3U CN202122595587U CN216573122U CN 216573122 U CN216573122 U CN 216573122U CN 202122595587 U CN202122595587 U CN 202122595587U CN 216573122 U CN216573122 U CN 216573122U
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Abstract
The utility model relates to production equipment for melting and converting ammonium thiocyanate into thiourea, which comprises a storage tank for storing an ammonium thiocyanate raw material, and a converter, wherein the storage tank is communicated with the converter and serves as a feeding end of the converter, the converter is communicated with a secondary cooling kettle, the secondary cooling kettle is communicated with a first centrifugal machine, a solid outlet of the first centrifugal machine is communicated with a dissolving kettle, the dissolving kettle is communicated with a filter press, the filter press is communicated with a recrystallization kettle, the recrystallization kettle is communicated with a second centrifugal machine, a solid outlet of the second centrifugal machine is used for producing a product, a liquid outlet of the second centrifugal machine is communicated with a first mother liquid tank, and the first mother liquid tank flows back to the dissolving kettle. The method has the advantages that the reaction is carried out through the converter, the stabilizer is added, the conversion rate of the ammonium thiocyanate is greatly improved through the melting process, and the method is used for producing thiourea; the device has the advantages of wide raw material source, low cost, simple process, extremely high conversion rate which can reach 90 percent, and is very suitable for the industrial production of thiourea.
Description
Technical Field
The utility model relates to thiourea production equipment, in particular to production equipment for melting and converting ammonium thiocyanate into thiourea.
Background
Coking plants typically produce large quantities of doctor solution and large quantities of ammonium thiocyanate by-product from salt extraction. As an important chemical raw material, ammonium thiocyanate has wide and important application in the fields of pesticide intermediates and the like. The thiourea is an isomer of ammonium thiocyanate, and the ammonium thiocyanate is converted into the thiourea, so that the economic value of the product can be greatly improved, and the application range can be further expanded. The melting method is a method for converting ammonium thiocyanate into thiourea, but is limited by various conditions at present, the conversion rate in a laboratory is generally not more than 45%, and the conversion rate in industrial production is difficult to reach even 30%. Therefore, based on the high-efficiency reactor formed by the rotary kiln and the addition of the special stabilizer, the conversion rate can be greatly improved to 90 percent, the technical level of the industry is greatly improved, and the production equipment for the high-efficiency ammonium thiocyanate to melt and convert the thiourea is provided aiming at the reaction process.
Disclosure of Invention
In view of this, the utility model aims to provide a production device for the melt conversion of thiourea from ammonium thiocyanate.
In order to achieve the purpose, the technical scheme is as follows:
a production device for melting and converting ammonium thiocyanate into thiourea comprises a storage tank for storing ammonium thiocyanate raw materials and a converter, wherein the storage tank is communicated with the converter and serves as a feeding end of the converter, the converter is communicated with a secondary cooling kettle, the secondary cooling kettle is communicated with a first centrifugal machine, a solid outlet of the first centrifugal machine is communicated with a dissolving kettle, the dissolving kettle is communicated with a filter press, the filter press is communicated with a recrystallization kettle, the recrystallization kettle is communicated with a second centrifugal machine, a solid outlet of the second centrifugal machine is used for producing products, a liquid outlet of the second centrifugal machine is communicated with a first mother liquid tank, and the first mother liquid tank flows back to the dissolving kettle;
the liquid outlet of the first centrifugal machine is communicated with a second mother liquid tank, the second mother liquid tank is communicated with a concentration kettle, the concentration kettle is communicated with a crystallization kettle, the crystallization kettle is communicated with a third centrifugal machine, the third centrifugal machine is communicated with the second mother liquid tank, and the second mother liquid tank is communicated with a converter in a backflow mode;
in addition, the third centrifuge solids outlet produces product that is conveyed to a storage tank.
As a further improvement of the structure of the utility model: the converter comprises a frame body, wherein a jacket is erected on the frame body, an inner sleeve is installed in the jacket, a gap for introducing steam is arranged between the jacket and the inner sleeve, two ends of the jacket are erected on the frame body through a rotating shaft, a pipeline communicated with the gap is arranged on the outer wall of the jacket, the pipeline is communicated with a cavity in the rotating shaft at one end of the jacket, a steam outlet pipe is arranged in the cavity of the rotating shaft at the end in a penetrating manner, the steam outlet pipe is communicated with the gap, a vacuumizing pipe is arranged in the rotating shaft at the other end of the jacket in a penetrating manner, one end of the vacuumizing pipe is communicated with the inner sleeve, a stirring blade is installed at one end of the vacuumizing pipe, and a net sleeve is installed at the front end of the stirring blade;
in addition, the upper end and the lower end of the jacket are respectively provided with a feed inlet and a discharge outlet which are communicated with the inner sleeve, a rotating shaft provided with a vacuumizing tube is connected with a driver, and two ends of the pipeline are respectively communicated with the gap through the positions, close to the feed inlet and the discharge outlet, of the jacket.
As a further improvement of the structure of the utility model: and a first circulating pump is arranged between the first mother liquid tank and the dissolving kettle.
As a further improvement of the structure of the utility model: and a second circulating pump is arranged between the third mother liquid tank and the converter.
The utility model has the beneficial effects that:
the method has the advantages that the reaction is carried out through the converter, the stabilizer is added, the conversion rate of ammonium thiocyanate is greatly improved through the melting process, and the method is used for producing thiourea; the device has the advantages of wide raw material source, low cost, simple process, extremely high conversion rate which can reach 90 percent, and is very suitable for the industrial production of thiourea.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a converter according to the present invention;
FIG. 3 is a block diagram of the process flow of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Please refer to fig. 1-2: a production device for melting and converting ammonium thiocyanate into thiourea comprises a storage tank 1 for storing ammonium thiocyanate raw materials and a converter 2, wherein the storage tank 1 is communicated with the converter 2 and serves as a feeding end of the converter 2, the converter 2 is communicated with a secondary cooling kettle 3, the secondary cooling kettle 3 is communicated with a first centrifuge 4, a solid outlet of the first centrifuge 4 is communicated with a dissolving kettle 5, the dissolving kettle 5 is communicated with a filter press 6, the filter press 6 is communicated with a recrystallization kettle 7, the recrystallization kettle 7 is communicated with a second centrifuge 8, a solid outlet of the second centrifuge 8 is used for producing products, a liquid outlet of the second centrifuge 8 is communicated with a first mother liquid tank 9, and the first mother liquid tank 9 flows back to the dissolving kettle 5;
the liquid outlet of the first centrifuge 4 is communicated with a second mother liquid tank 10, the second mother liquid tank 10 is communicated with a concentration kettle 11, the concentration kettle 11 is communicated with a crystallization kettle 12, the crystallization kettle 12 is communicated with a third centrifuge 13, the liquid outlet of the third centrifuge 13 is communicated with a third mother liquid tank 14, and the third mother liquid tank 14 is communicated with the converter 2 in a backflow mode;
in addition, the solid outlet of the third centrifuge 13 outputs a product to be conveyed to the storage tank 1.
The converter 2 comprises a frame body 21, a jacket 22 is erected on the frame body 21, an inner sleeve 23 is installed in the jacket 22, a gap 24 for introducing steam is arranged between the jacket 22 and the inner sleeve 23, two ends of the jacket 22 are erected on the frame body 21 through a rotating shaft 25, a pipeline 26 for communicating the gap 24 is arranged on the outer wall of the jacket 22, the pipeline 26 is communicated with a cavity inside the rotating shaft 25 at one end of the jacket 22, a steam outlet pipe 27 penetrates through the cavity of the rotating shaft 25 at the end, the steam outlet pipe 27 is communicated with the gap 24, a vacuumizing pipe 28 penetrates through the rotating shaft 25 at the other end of the jacket 22, one end of the vacuumizing pipe 28 is communicated with the inner sleeve 23, a stirring blade 29 is installed at the end, and a net sleeve 30 is installed at the front end of the stirring blade 29;
in addition, the upper and lower ends of the jacket 22 are respectively provided with a feed port 31 and a discharge port 32 communicated with the inner sleeve 23, and the rotating shaft 25 provided with the evacuation pipe 28 is connected with a driver 33.
A first circulating pump 15 is arranged between the first mother liquid tank 9 and the dissolving kettle 5; a second circulating pump 16 is arranged between the second mother liquor tank 10 and the converter 2.
Referring to fig. 2, the apparatus is used in a process for the melt conversion of ammonium thiocyanate into thiourea:
(1) directly putting ammonium thiocyanate and a small amount of stabilizer into a rotary kiln-shaped high-efficiency reactor in a solid state, and turning to make the materials uniform;
the stabilizer is characterized by comprising, but not limited to, thiocyanate such as calcium thiocyanate, barium thiocyanate and the like;
the method is characterized in that the high-efficiency reactor is in a rotary kiln shape, and the reaction contact area is greatly increased by the film distribution of materials on the surface of equipment;
(2) heating the material, carrying out conversion reaction at a certain temperature, and maintaining for a period of time;
the method is characterized by comprising but not limited to using steam, heat conducting oil and the like as heating media, wherein the reaction temperature is 100-160 ℃, and the reaction time is 0.5-8 h;
(3) after the reaction is finished, introducing a small amount of water for dilution and temperature reduction, then discharging and flowing into a cooling kettle, introducing circulating water into the cooling kettle to reduce the temperature of the material again, separating out a large amount of crystals, performing centrifugal separation, respectively collecting the crystals and primary mother liquor, concentrating the collected primary mother liquor, and collecting the crystals as a thiourea crude product;
the method is characterized in that the addition amount of water is 1/7-1/5 of the amount of the material during secondary cooling, the cooling rate is 5-10 ℃/h, and the cooling end point is 20-40 ℃;
(4) dissolving the collected thiourea crude product by using steam condensate water, then removing insoluble substances by filter pressing, cooling, recrystallizing, centrifugally separating, respectively collecting pure thiourea crystals and mother liquor, returning the mother liquor to dissolve the thiourea crude product, and drying and packaging the pure thiourea to obtain a finished product;
the method is specifically characterized in that the concentration of a thiourea crude product is 100-150 g/L, the cooling rate is 2-10 ℃/h during cooling crystallization, and the cooling end point is 20-40 ℃;
(5) evaporating and concentrating the mother liquor collected in the step 3, then cooling and crystallizing to separate out unreacted ammonium thiocyanate, performing centrifugal separation, respectively collecting ammonium thiocyanate and the mother liquor, wherein the ammonium thiocyanate is used as a raw material in the front section of the process, and the mother liquor returns to the step 3 for dilution and cooling;
the method is characterized in that the cooling rate is 2-10 ℃/h during cooling crystallization, and the cooling end point is 20-40 ℃.
The device takes ammonium thiocyanate as a raw material for reaction, a stabilizer is added, and the ammonium thiocyanate is converted into the thiourea of an isomer by melting the ammonium thiocyanate by adopting a high-efficiency reactor in a rotary kiln shape. Firstly, putting ammonium thiocyanate and a stabilizer into a high-efficiency reactor together, and then respectively introducing steam for heating to melt the ammonium thiocyanate and partially convert the ammonium thiocyanate into thiourea. Then, diluting with a small amount of water after the reaction is finished, cooling, performing centrifugal separation, and collecting a thiourea crude product and a primary mother solution; dissolving the thiourea crude product by using steam condensed water, removing insoluble substances by pressure filtration, cooling and crystallizing, centrifugally separating, respectively collecting pure thiourea and recrystallization mother liquor, drying the pure thiourea and packaging to obtain a finished product, wherein the recrystallization mother liquor is used for dissolving the thiourea crude product; evaporating and concentrating primary mother liquor, cooling and crystallizing, and performing centrifugal separation to obtain ammonium thiocyanate and mother liquor, wherein the ammonium thiocyanate is used as a raw material in the front section of the process, and the mother liquor is used for diluting cooling materials.
The device can effectively improve the ammonium thiocyanate conversion rate from 45% to 90% now, is very suitable for the industrial production of thiourea.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides an ammonium thiocyanate melt-conversion thiourea's production facility, includes the storage tank of storage ammonium thiocyanate raw materials, its characterized in that: the device comprises a storage tank, a secondary cooling kettle, a first centrifuge solid outlet, a dissolving kettle, a pressure filter, a recrystallization kettle, a second centrifuge, a first mother liquid tank and a second mother liquid tank, wherein the storage tank is communicated with the converter and serves as a feeding end of the converter;
the liquid outlet of the first centrifuge is communicated with a second mother liquid tank, the second mother liquid tank is communicated with a concentration kettle, the concentration kettle is communicated with a crystallization kettle, the crystallization kettle is communicated with a third centrifuge, the liquid outlet of the third centrifuge is communicated with a third mother liquid tank, and the third mother liquid tank is communicated with a converter in a backflow mode;
in addition, the third centrifuge solids outlet produces product that is conveyed to a storage tank.
2. The apparatus for producing thiourea from ammonium thiocyanate according to claim 1, wherein: the converter comprises a frame body, wherein a jacket is erected on the frame body, an inner sleeve is installed in the jacket, a gap for introducing steam is arranged between the jacket and the inner sleeve, two ends of the jacket are erected on the frame body through a rotating shaft, a pipeline communicated with the gap is arranged on the outer wall of the jacket, the pipeline is communicated with a cavity in the rotating shaft at one end of the jacket, a steam outlet pipe is arranged in the cavity of the rotating shaft at the end in a penetrating manner, the steam outlet pipe is communicated with the gap, a vacuumizing pipe is arranged in the rotating shaft at the other end of the jacket in a penetrating manner, one end of the vacuumizing pipe is communicated with the inner sleeve, a stirring blade is installed at one end of the vacuumizing pipe, and a net sleeve is installed at the front end of the stirring blade;
in addition, the upper end and the lower end of the jacket are respectively provided with a feed inlet and a discharge outlet which are communicated with the inner sleeve, a rotating shaft provided with a vacuumizing tube is connected with a driver, and two ends of the pipeline are respectively communicated with the gap through the positions, close to the feed inlet and the discharge outlet, of the jacket.
3. The apparatus for producing thiourea from ammonium thiocyanate according to claim 1, wherein: and a first circulating pump is arranged between the first mother liquid tank and the dissolving kettle.
4. The apparatus for producing thiourea from ammonium thiocyanate according to claim 1, wherein: and a second circulating pump is arranged between the third mother liquid tank and the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122595587.3U CN216573122U (en) | 2021-10-27 | 2021-10-27 | Production equipment for melting and converting ammonium thiocyanate into thiourea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122595587.3U CN216573122U (en) | 2021-10-27 | 2021-10-27 | Production equipment for melting and converting ammonium thiocyanate into thiourea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216573122U true CN216573122U (en) | 2022-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122595587.3U Active CN216573122U (en) | 2021-10-27 | 2021-10-27 | Production equipment for melting and converting ammonium thiocyanate into thiourea |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216573122U (en) |
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2021
- 2021-10-27 CN CN202122595587.3U patent/CN216573122U/en active Active
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