Reaction device for wet synthesis of sodium cyanate

Abstract

The utility model discloses a reaction device for wet synthesis of sodium cyanate, which comprises a dissolving kettle and a synthesis kettle, and the dissolving kettle is communicated with the synthesis kettle through a pipeline; the dissolving kettle and the synthesis kettle are communicated with the o-dichlorobenzene tank through pipelines, the synthesis kettle is communicated with the filter through a pipeline, and the filter is communicated with the mother liquor tank through a pipeline. According to the wet synthesis device disclosed by the utility model, the dissolving kettle and the synthesis kettle are matched with the material transfer pump to finish feeding, dissolving, stirring and reaction of raw materials, the condensation reflux of a solvent is finished through the plurality of groups of condensers, and the spraying and recycling of tail gas are finished through the plurality of groups of spraying towers matched with the material transfer pump, so that the content of sodium cyanate produced by the whole wet synthesis device is higher; meanwhile, the generated ammonia gas can be converted into ammonium carbonate to be recycled, so that the production cost and the environmental pollution are effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical production equipment technical field, concretely relates to a reaction unit of sodium cyanate of wet synthesis. BACKGROUND

[0002] Sodium cyanate is an important chemical raw material, can be used for organic synthesis, pharmaceutical industry, steel heat treatment etc., can be used for synthesis of killing young urea, such as chlorothalonil cyanate on pesticide.

[0003] There are two methods for preparing sodium cyanate: one is dry preparation, sodium carbonate and urea need to be loaded into high-temperature reaction furnace to carry out solid-solid reaction at high temperature, but this method will produce more alkaline gas, and the solid material is easy to mix unevenly, resulting in low content; another method is wet preparation, urea and sodium carbonate need to be dissolved in the reaction kettle with solvent to carry out reaction, this method will also produce alkaline gas; therefore, when producing sodium cyanate by the above two methods, tail gas treatment device needs to be installed, resulting in low yield of finished product and high production cost. UTILITY MODEL CONTENT

[0004] The utility model discloses a reaction device of sodium cyanate of wet synthesis.

[0005] The utility model discloses a reaction device of sodium cyanate of wet synthesis.

[0006] The dissolving kettle is communicated with the synthesis kettle through pipeline, and the synthesis kettle is communicated with the filter through pipeline.

[0007] The dissolving kettle and the synthesis kettle are communicated with the o-dichlorobenzene tank through pipeline, the synthesis kettle is communicated with the filter through pipeline, the filter is communicated with the mother liquor tank through pipeline, the synthesis kettle is communicated with the spray tower through pipeline, and the spray tower is used for absorbing tail gas.

[0008] As a further description of the above technical scheme, the dissolving kettle is provided with a plurality of first flow-through ends on the top, one group of the first flow-through ends is communicated with the bottom of the first condenser through pipeline, and one group of the first flow-through ends is communicated with the nitrogen end through pipeline.

[0009] As a further description of the above technical scheme, the dissolving kettle is provided with a plurality of first flow-through ends on the top, one group of the first flow-through ends is communicated with the bottom of the first condenser through pipeline, and one group of the first flow-through ends is communicated with the nitrogen end through pipeline.

[0010] As a further description of the above technical scheme, the dissolving kettle is provided with a plurality of first flow-through ends on the top, one group of the first flow-through ends is communicated with the bottom of the first condenser through pipeline, and one group of the first flow-through ends is communicated with the nitrogen end through pipeline.

[0011] As the further description of the above technical scheme, the fifth flow-through end is communicated with one side of the dissolving kettle and the bottom of the o-dichlorobenzene tank through pipelines, and the sixth flow-through end is communicated with the top of the filter through pipelines.

[0012] As the further description of the above technical scheme, the bottom of the o-dichlorobenzene tank is communicated with one side of the dissolving kettle and one side of the synthesis kettle through pipelines, and a first material transfer pump is arranged on the pipeline of the o-dichlorobenzene tank.

[0013] As the further description of the above technical scheme, the bottom of the filter is communicated with the top of the mother liquor tank through pipelines, and a second material transfer pump is arranged on the pipeline of the mother liquor tank.

[0014] As the further description of the above technical scheme, the bottom of the second condenser is communicated with one side of the spray tower through pipelines, and a third material transfer pump is arranged on the pipeline of the spray tower.

[0015] As the further description of the above technical scheme, the other side of the spray tower is communicated with the top of the ammonium carbonate aqueous solution tank through pipelines, and a fourth material transfer pump is arranged on the pipeline of the ammonium carbonate aqueous solution tank.

[0016] As the further description of the above technical scheme, the top of the dissolving kettle and the synthesis kettle is provided with a stirring motor, one side of the stirring motor is provided with a thermometer, the inside of the dissolving kettle and the synthesis kettle is provided with a stirring paddle, and the stirring paddle is rotationally connected with the stirring motor.

[0017] The beneficial effects of the present application are as follows:

[0018] The present application realizes the feeding, dissolving, stirring and reaction of raw materials through the cooperation of the dissolving kettle and the synthesis kettle and the material transfer pump, realizes the condensation reflux of solvents through multiple condensers, realizes the spraying and recycling of tail gas through multiple spray towers and the material transfer pump, the sodium cyanate produced by the whole wet synthesis device has a high content, the ammonia gas produced can be converted into ammonium carbonate for recycling, and the production cost and environmental pollution are effectively reduced.

[0019] In order to more clearly illustrate the structural features and effects of the present application, the present application will be described in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the reaction device for wet synthesis of sodium cyanate of the present application.

[0021] Reference signs:

[0022] 1, dissolution kettle; 101, first flow end; 102, second flow end; 103, third flow end; 2, synthesis kettle; 201, fourth flow end; 202, fifth flow end; 203, sixth flow end; 3, o-dichlorobenzene tank; 4, filter; 5, mother liquor tank; 6, first condenser; 7, second condenser; 8, first transfer pump; 9, second transfer pump; 10, spray tower; 11, ammonium carbonate aqueous solution tank; 12, third transfer pump; 13, fourth transfer pump; 14, stirring motor; 15, stirring paddle; 16, thermometer. DETAILED DESCRIPTION

[0023] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0024] As shown in the drawings, Figure 1 In one embodiment, a reaction device for synthesizing sodium cyanate by wet method comprises: a dissolution kettle 1 and a synthesis kettle 2, and the dissolution kettle 1 is communicated with the synthesis kettle 2 through pipelines.

[0025] The dissolution kettle 1 is used for dissolving urea and o-dichlorobenzene, and at the same time, the dissolution kettle 1 is used as a stirring kettle to fully stir the internal materials; the synthesis kettle 2 is used for the reaction of urea and sodium carbonate in o-dichlorobenzene solvent to generate sodium cyanate, and at the same time, the synthesis kettle 2 is used as a stirring kettle to fully stir the internal materials.

[0026] Further, the dissolution kettle 1 and the synthesis kettle 2 are communicated with an o-dichlorobenzene tank 3 through pipelines, so that the solvent in the o-dichlorobenzene tank 3 can deliver the corresponding solvent according to the production requirements; the synthesis kettle 2 is communicated with a filter 4 through pipelines, and the filter 4 is communicated with a mother liquor tank 5 through pipelines, so that the reaction product can be filtered out, and the filtered mother liquor can be collected again. The mother liquor tank 5 is used for delivering the filtered mother liquor to a solvent recovery section through a transfer pump; and the tail gas generated in the synthesis kettle 2 is introduced into a spray tower 10, a plurality of groups of spray towers 10 complete the circulation delivery or are sent to an ammonium carbonate aqueous solution tank 11 to a recovery ammonium carbonate section through corresponding connected circulating pumps, to complete the recovery and reuse of the tail gas.

[0027] Please continue to refer to Figure 1 In the embodiment, the dissolution kettle 1 and the synthesis kettle 2 are provided with a stirring motor 14 at the top, and the dissolution kettle 1 and the synthesis kettle 2 are provided with a stirring paddle 15 inside, and the stirring paddle 15 is rotationally connected with the stirring motor 14, so that the stirring motor 14 can drive the stirring paddle 15 to fully stir the internal materials; correspondingly, the stirring motor 14 is provided with a thermometer 16 on one side, which can monitor the heating process of the heating jacket outside the dissolution kettle 1 and the synthesis kettle 2, and further control the heating temperature inside the dissolution kettle 1 and the synthesis kettle 2.

[0028] Exemplarily, in the embodiment, the top of the dissolving kettle 1 is provided with a plurality of groups of first flow-through ends 101, one group of the first flow-through ends 101 is communicated with the bottom of the first condenser 6 through a pipeline, and one group of the first flow-through ends 101 is communicated with a nitrogen end through a pipeline; one side of the dissolving kettle 1 is provided with a second flow-through end 102, the second flow-through end 102 is communicated with the bottom of the o-dichlorobenzene tank 3 through a pipeline, and the bottom of the dissolving kettle 1 is provided with a third flow-through end 103, the third flow-through end 103 is communicated with one side of the synthesis kettle 2 through a pipeline.

[0029] Correspondingly, the top of the synthesis kettle 2 is provided with a plurality of groups of fourth flow-through ends 201, one group of the fourth flow-through ends 201 is communicated with the bottom of the second condenser 7 through a pipeline, and one group of the fourth flow-through ends 201 is communicated with a nitrogen end through a pipeline; one side of the synthesis kettle 2 is provided with a fifth flow-through end 202, the fifth flow-through end 202 is communicated with one side of the dissolving kettle 1 and the bottom of the o-dichlorobenzene tank 3 through a pipeline, and the bottom of the synthesis kettle 2 is provided with a sixth flow-through end 203, the sixth flow-through end 203 is communicated with the top of the filter 4 through a pipeline.

[0030] Exemplarily, in the embodiment, the bottom of the o-dichlorobenzene tank 3 is communicated with one side of the dissolving kettle 1 and one side of the synthesis kettle 2 through a pipeline, the o-dichlorobenzene tank 3 is used for storing corresponding o-dichlorobenzene raw materials, and a first material transfer pump 8 is arranged on the pipeline of the o-dichlorobenzene tank 3, which is used for conveying o-dichlorobenzene to the corresponding kettle body; correspondingly, the bottom of the filter 4 is communicated with the top of the mother liquor tank 5 through a pipeline, the filter 4 is used for filtering out the product after reaction and obtaining high-purity product through subsequent drying process, and the mother liquor tank 5 is used for receiving the filtered mother liquor, and a second material transfer pump 9 is arranged on the pipeline of the mother liquor tank 5, which is used for transferring the material to the recovery solvent section of the post-treatment.

[0031] It needs to be particularly pointed out that, in the embodiment, the first condenser 6 is used for condensing and refluxing the solvent volatilized in the dissolving kettle 1, one end of the first condenser 6 is communicated with the outside through a pipeline, which is used for discharging tail gas; and the second condenser 7 is used for condensing and refluxing the solvent volatilized in the synthesis kettle 2, one end of the second condenser 7 is communicated with the spray tower 10 through a jacket pipeline, which is used for absorbing the tail gas generated in the reaction. Specifically, the first condenser 6 and the second condenser 7 must be condensed with hot water; exemplarily, in actual operation, the jacket of the corresponding flow-through end pipeline (ascending pipeline and reflux pipeline) and tail gas pipeline of the first condenser 6 and the second condenser 7 is filled with 70℃ hot water.

[0032] Further, the bottom of the second condenser 7 is communicated with one side of the spray tower 10 through a pipeline, and a third material transfer pump 12 is arranged on the pipeline communicated with the spray tower 10; and the other side of the spray tower 10 is communicated with the top of the ammonium carbonate aqueous solution tank 11 through a pipeline, and a fourth material transfer pump 13 is arranged on the pipeline communicated with the ammonium carbonate aqueous solution tank 11.

[0033] Exemplarily, taking a two-stage spray system composed of two groups of spray towers 10 as an example, a first-stage spray tower 10 is arranged at the fourth flow end 201 of the synthesis kettle 2, and is used for spraying and absorbing the generated carbon dioxide and ammonia; a second-stage spray tower 10 is arranged at the tail gas flow end of the first-stage spray tower 10, and is used for spraying and absorbing the ammonia and carbon dioxide escaped from the first-stage spray tower 10; one group of third circulating pumps is arranged beside the second-stage spray tower 10, and is used for circulating the absorption liquid in the second-stage spray tower 10 and transferring the second-stage absorption liquid to the first-stage spray tower 10; another group of third circulating pumps is arranged beside the first-stage spray tower 10, and is used for circulating the absorption liquid in the first-stage spray tower 10 and transferring the first-stage absorption liquid to the ammonium carbonate aqueous solution tank 11; the ammonium carbonate aqueous solution tank 11 receives the absorption-saturated first-stage absorption liquid through a third material transfer pump 12; and a fourth material transfer pump 13 is arranged behind the ammonium carbonate aqueous solution tank 11, and is used for transferring the absorption-saturated ammonium carbonate aqueous solution to a post-treatment section to recover ammonium carbonate.

[0034] Working principle:

[0035] Taking o-dichlorobenzene as a reaction solvent as an example, first, the feeding port at the top of the dissolving kettle 1 is opened, and the weighed urea is added, the feeding port is closed, the solvent o-dichlorobenzene is pumped into the dissolving kettle 1 through the first material transfer pump 8, the stirring motor 14 is opened to drive the stirring paddle 15 to stir, the heating jacket outside the dissolving kettle 1 is controlled by the thermometer 16 to heat the inside of the dissolving kettle 1 to 80-90℃, and the material is dissolved;

[0036] Secondly, the feeding port at the top of the synthesis kettle 2 is opened, and the weighed sodium carbonate is added, the feeding port is closed, then the solvent o-dichlorobenzene is pumped in through the first material transfer pump 8, the stirring motor 14 is opened to drive the stirring paddle 15 to stir, the heating jacket outside the synthesis kettle 2 is controlled by the thermometer 16 to heat the inside of the synthesis kettle 2 to 140-150℃, the urea solution in the dissolving kettle 1 is dropped into the synthesis kettle through the pipeline, the temperature is kept at 140-150℃, and the dropping is slowly added for 4 hours, and then the temperature is kept for 2 hours;

[0037] Thirdly, after the reaction is completed, the temperature is lowered to below 30℃, the product is filtered out through the filter 4, and then dried to obtain high-content sodium cyanate, and the filtered mother liquor is filtered into the mother liquor tank 5, and after the filtration is completed, the mother liquor in the mother liquor tank 5 is transferred to the solvent recovery section through the second material transfer pump 9;

[0038] Then, the mixed gas of carbon dioxide and ammonia generated in the synthesis kettle 2 is introduced into the first-stage spray tower 10 for spraying and absorption, the gas escaped from the first-stage spray tower 10 is introduced into the second-stage spray tower 10 for absorption; after the first-stage spray tower 10 is absorption-saturated, the first-stage absorption liquid is transferred to the ammonium carbonate aqueous solution tank 11 by the third circulating pump; and the second-stage absorption liquid in the second-stage spray tower 10 is transferred to the first-stage spray tower 10 by the third circulating pump, and new water can be added to the second-stage spray tower 10 for absorption.

[0039] The collected absorption solution in the last ammonium carbonate aqueous solution storage tank is transferred to the ammonium carbonate recovery section by the fourth transfer pump 13 for recycling.

[0040] Through the technical scheme, the sodium cyanate produced by the whole wet synthesis device has high content, the generated ammonia gas can be converted into ammonium carbonate form for recycling, and the production cost and environmental pollution are effectively reduced.

[0041] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A reaction apparatus for wet synthesis of sodium cyanate, characterized by comprising: The utility model relates to a kind of o-dichlorobenzene production device, including: Dissolution kettle and synthesis kettle, the dissolution kettle is communicated with the synthesis kettle by pipeline; The dissolution kettle and the synthesis kettle are communicated with o-dichlorobenzene tank by pipeline, the synthesis kettle is communicated with filter by pipeline, the filter is communicated with mother liquor tank by pipeline, the synthesis kettle is communicated with spray tower for absorbing tail gas by pipeline.

2. The reaction apparatus for wet synthesis of sodium cyanate according to claim 1, characterized by, The top of the dissolution kettle is provided with a plurality of first flow-through ends, one set of the first flow-through ends is communicated with the bottom of the first condenser by pipeline, and one set of the first flow-through ends is communicated with the nitrogen end by pipeline.

3. The reaction apparatus for wet synthesis of sodium cyanate according to claim 2, characterized by, The side of the dissolution kettle is provided with a second flow-through end, which is communicated with the bottom of the o-dichlorobenzene tank by pipeline, and the bottom of the dissolution kettle is provided with a third flow-through end, which is communicated with one side of the synthesis kettle by pipeline.

4. The reaction apparatus for wet synthesis of sodium cyanate according to claim 1, characterized by The top of the synthesis kettle is provided with a plurality of fourth flow-through ends, one set of the fourth flow-through ends is communicated with the bottom of the second condenser by pipeline, and one set of the fourth flow-through ends is communicated with the nitrogen end by pipeline.

5. The reaction apparatus for wet synthesis of sodium cyanate according to claim 4, characterized by The side of the synthesis kettle is provided with a fifth flow-through end, which is communicated with one side of the dissolution kettle and the bottom of the o-dichlorobenzene tank by pipeline, and the bottom of the synthesis kettle is provided with a sixth flow-through end, which is communicated with the top of the filter by pipeline.

6. The reaction apparatus for wet synthesis of sodium cyanate according to claim 5, wherein The bottom of the o-dichlorobenzene tank is communicated with one side of the dissolution kettle and one side of the synthesis kettle by pipeline, and a first material transfer pump is arranged on the communication pipeline of the o-dichlorobenzene tank.

7. The reaction apparatus for wet synthesis of sodium cyanate according to claim 5, wherein The bottom of the filter is communicated with the top of the mother liquor tank by pipeline, and a second material transfer pump is arranged on the communication pipeline of the mother liquor tank.

8. The reaction apparatus for wet synthesis of sodium cyanate according to claim 4, wherein The bottom of the second condenser is communicated with one side of the spray tower by pipeline, and a third material transfer pump is arranged on the communication pipeline of the spray tower.

9. The reaction apparatus for wet synthesis of sodium cyanate according to claim 8, characterized by The other side of the spray tower is communicated with the top of the ammonium carbonate aqueous solution tank by pipeline, and a fourth material transfer pump is arranged on the communication pipeline of the ammonium carbonate aqueous solution tank.

10. The reaction apparatus for wet synthesis of sodium cyanate according to claim 1, characterized by The top of the dissolution kettle and the synthesis kettle is provided with a stirring motor, one side of the stirring motor is provided with a thermometer, the inside of the dissolution kettle and the synthesis kettle is provided with a stirring paddle, and the stirring paddle and the stirring motor are rotationally connected.

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