Continuous reaction device for sodium hypophosphite

Abstract

The utility model discloses a continuous reaction device for sodium hypophosphite. The continuous reaction device comprises a primary reaction kettle and a secondary reaction kettle, the first-stage reaction kettle is connected with a first material circulating pipeline; the second-stage reaction kettle is connected with a second material circulating pipeline; the first material circulating pipeline is connected with the secondary reaction kettle through a first branch pipe; the second material circulating pipeline is connected with a discharging branch pipe; a gas outlet of the secondary reaction kettle is connected with a subsequent reaction device through a gas pipeline; and a condenser is mounted on the gas pipeline. Through the design of the first-stage reaction kettle, the second-stage reaction kettle, the first material circulating pipeline and the second material circulating pipeline, the generation reaction of sodium hypophosphite is carried out in the first-stage reaction kettle and the second-stage reaction kettle in sequence, and continuous feeding, reaction and discharging can be realized, so that the continuous reaction is realized, the reaction efficiency in each stage of reaction kettle is high, and the production cost is low. The raw material conversion rate is high, and the obtained reaction gas can be stably output.

Description

Technical Field

[0001] The utility model relates to the field of sodium hypophosphite production equipment, in particular to a continuous reaction device for sodium hypophosphite. Background Art

[0002] Sodium hypophosphite is an important chemical raw material. In the industry, it is usually produced by reacting caustic solution with yellow phosphorus to generate sodium hypophosphite, phosphine and hydrogen. Among them, the by-products phosphine gas and hydrogen can also be used as reaction raw materials for THPX (tetrahydroxymethyl series) products.

[0003] In the prior art, the production of sodium hypophosphite mostly adopts the way of batch reaction in a single reaction kettle. The materials are initially heated and then react by natural heating. This reaction method not only has the problem of low reaction efficiency, but also the amount of by-product phosphine gas is unstable, and its reuse value is low, resulting in waste of resources. Summary of the Utility Model

[0004] The utility model provides a continuous reaction device for sodium hypophosphite, which can solve the above problems existing in the application of the existing sodium hypophosphite production device in the production of sodium hypophosphite.

[0005] To solve the above technical problems, the utility model provides a continuous reaction device for sodium hypophosphite, including: a primary reaction kettle and a secondary reaction kettle; the primary reaction kettle is connected to a first material circulation pipeline; the secondary reaction kettle is connected to a second material circulation pipeline; the first material circulation pipeline is connected to the secondary reaction kettle through a first branch pipe; an outlet branch pipe is connected to the second material circulation pipeline;

[0006] The gas outlet of the secondary reaction kettle is connected to a subsequent reaction device through a gas pipeline; a condenser is installed on the gas pipeline.

[0007] In a preferred embodiment of the utility model, the gas outlet of the primary reaction kettle is connected to the secondary reaction kettle through a pipeline.

[0008] In a preferred embodiment of the utility model, a gas-liquid separator is connected to the pipeline.

[0009] In a preferred embodiment of the utility model, the first material circulation pipeline includes a first circulation pipe, a first circulation pump and a first flow regulating valve. Among them, the two ends of the first circulation pipe are respectively connected to the discharge port and the return port of the primary reaction kettle; the first circulation pump and the first flow regulating valve are installed on the first circulation pipe.

[0010] In a preferred embodiment of the utility model, the first branch pipe is connected to the first circulation pipe, and the connection point is located between the first circulation pump and the first flow regulating valve. A second flow regulating valve is installed on the first branch pipe.

[0011] In a preferred embodiment of the present utility model, the second material circulation pipeline includes a second circulation pipe, a second circulation pump, and a third flow regulating valve. Among them, both ends of the second circulation pipe are respectively connected to the discharge port and the return port of the secondary reaction kettle; the second circulation pump and the third flow regulating valve are installed on the second circulation pipe.

[0012] In a preferred embodiment of the present utility model, the discharge branch pipe is connected to the second circulation pipe, and the connection point is located between the second circulation pump and the third flow regulating valve. A fourth flow regulating valve is installed on the discharge branch pipe.

[0013] In a preferred embodiment of the present utility model, a first liquid level gauge is installed on the primary reaction kettle, and a second liquid level gauge is installed on the secondary reaction kettle.

[0014] In a preferred embodiment of the present utility model, the device further includes a program controller, and the program controller is connected to the first liquid level gauge, the second liquid level gauge, the first flow regulating valve, the second flow regulating valve, the third flow regulating valve, and the fourth flow regulating valve;

[0015] Among them, the first liquid level gauge is connected to the first flow regulating valve and the second flow regulating valve through the program controller for linkage control;

[0016] The second liquid level gauge is connected to the third flow regulating valve and the fourth flow regulating valve through the program controller for linkage control.

[0017] In a preferred embodiment of the present utility model, the secondary reaction kettle is provided with a heat insulation jacket, and the heat insulation jacket is connected to hot steam.

[0018] The beneficial effects of the present utility model are as follows: A continuous reaction device for sodium hypophosphite of the present utility model, through the design of the primary reaction kettle, the secondary reaction kettle, the first material circulation pipeline, and the second material circulation pipeline, enables the formation reaction of sodium hypophosphite to occur successively in the primary reaction kettle and the secondary reaction kettle, can continuously feed, react, and discharge materials, thereby realizing continuous reaction, and the reaction efficiency in each reaction kettle is high, the raw material conversion rate is high, and the obtained reaction gas can also be stably output, with strong practicability. Description of the Drawings

[0019] Figure 1 is a three-dimensional structural schematic diagram of a preferred embodiment of a continuous reaction device for sodium hypophosphite of the present utility model;

[0020] The marks of each component in the drawings are as follows:

[0021] 10. Primary reaction kettle, 11. First liquid level gauge;

[0022] 20. Secondary reactor, 21. Second liquid level gauge;

[0023] 30. First material circulation pipeline, 31. First circulation pipe, 32. First circulation pump, 33. First flow regulating valve;

[0024] 40. Second material circulation pipeline, 41. Second circulation pipe, 42. Second circulation pump, 43. Third flow regulating valve;

[0025] 50. First branch pipe, 51. Second flow regulating valve;

[0026] 60. Discharge branch pipe, 61. Fourth flow regulating valve;

[0027] 70. Heat insulation jacket; 80. Gas-liquid separator; 90. Condenser. Specific embodiments

[0028] The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0029] As shown in the attached Figure 1 figure, the present utility model discloses a continuous reaction device for sodium hypophosphite, including: a primary reactor 10 and a secondary reactor 20; the primary reactor 10 is connected to a first material circulation pipeline 30; the secondary reactor 20 is connected to a second material circulation pipeline 40; the first material circulation pipeline 30 is connected to the secondary reactor 20 through a first branch pipe 50; and a discharge branch pipe 60 is connected to the second material circulation pipeline 40.

[0030] Specifically, 2 material pipes are connected to the primary reactor 10, respectively used for inputting reaction raw materials into the primary reactor 10. For example, for the production of sodium hypophosphite, caustic solution and yellow phosphorus are respectively input. The caustic solution and yellow phosphorus initially react in the primary reactor 10 to generate sodium hypophosphite, phosphine gas and hydrogen. A stirrer is installed in the primary reactor 10, and a gas outlet is opened at its top. The gas outlet is connected to the secondary reactor through a pipeline, and a gas-liquid separator 80 is also connected to this pipeline, which is used to separate the phosphine gas and hydrogen generated by the reaction from water vapor and introduce them into the secondary reactor 20.

[0031] The first material circulation pipeline 30 includes a first circulation pipe 31, a first circulation pump 32, and a first flow regulating valve 33. Among them, both ends of the first circulation pipe 31 are respectively connected to the discharge port at the bottom and the return port at the top of the first-stage reaction kettle 10; the first circulation pump 32 and the first flow regulating valve 33 are installed on the first circulation pipe 31. One end of the first branch pipe 50 is connected to the first circulation pipe 31, and the connection point is located between the first circulation pump 32 and the first flow regulating valve 33. A second flow regulating valve 51 is installed on the first branch pipe 50. Through the design of the first flow regulating valve 33 and the second flow regulating valve 51, by adjusting the opening degrees of the two valves, on the one hand, the reaction solution in the first-stage reaction kettle 10 can circulate through the first circulation pipe 31 and the first circulation pump 32 to improve the reaction efficiency, and on the other hand, part of the reaction solution can enter the second-stage reaction kettle 20 through the first branch pipe 50.

[0032] The second-stage reaction kettle 20 is externally provided with a heat insulation jacket 70, and the heat insulation jacket 70 is connected to hot steam for heating the second-stage reaction kettle 10, so that the reaction liquid flowing in from the first-stage reaction kettle 20 is further strengthened in reaction under the condition of steam heating, and the unreacted completely white phosphorus and causticizing liquid in it react further. On the one hand, the reaction becomes more complete and the raw material utilization rate is improved; on the other hand, in cooperation with the first-stage reaction kettle, continuous reaction is realized.

[0033] The gas outlet of the second-stage reaction kettle 20 is connected to a subsequent reaction device, such as a reaction kettle for THPX (tetrahydroxymethyl series) products, through a gas pipeline, so that the by-product phosphine gas and hydrogen gas generated by the reaction of the causticizing liquid and white phosphorus and the phosphine gas and hydrogen gas entering the second-stage reaction kettle 20 from the gas outlet of the first-stage reaction kettle 10 enter the subsequent reaction device together for reuse, effectively improving the resource utilization rate.

[0034] A condenser 90 is also installed on the pipeline connecting the gas outlet of the second-stage reaction kettle 20. Through the function of the condenser 90, the water vapor mixed in the gas is condensed into water to prevent the pipeline from being blocked by condensation during the transportation of water vapor and forming a water seal.

[0035] In addition, the phosphine gas and hydrogen gas generated in the first-stage reaction kettle 10 are first transported into the second-stage reaction kettle 20, and then discharged together with the gas generated in the second-stage reaction kettle 10 after being condensed by the condenser 90. On the one hand, it realizes the sharing of one condenser, reduces equipment investment, and saves energy consumption; on the other hand, it ensures the stable transportation of phosphine gas and hydrogen gas.

[0036] The second material circulation pipeline 40 includes a second circulation pipe 41, a second circulation pump 42, and a third flow regulating valve 43. Among them, both ends of the second circulation pipe 41 are respectively connected to the discharge port at the bottom and the return port at the top of the secondary reaction kettle 20. The second circulation pump 42 and the third flow regulating valve 43 are installed on the second circulation pipe 41. One end of the discharge branch pipe 60 is connected to the second circulation pipe 41, and the connection point is located between the second circulation pump 42 and the third flow regulating valve 43. A fourth flow regulating valve 61, that is, a discharge valve, is installed on the discharge branch pipe 60.

[0037] Through the design of the third flow regulating valve 43 and the fourth flow regulating valve 61, by adjusting the opening degrees of the two valves, on the one hand, the reaction solution in the secondary reaction kettle 20 can circulate through the second circulation pipe 41 and the second circulation pump 42 to improve the reaction efficiency, and on the other hand, part of the reaction solution can be discharged through the discharge branch pipe 60 to achieve discharging.

[0038] However, after the liquid level in the reaction kettle reaches a certain value, effective material mixing cannot be achieved only by stirring. Therefore, through the design of the first material circulation pipeline 30 and the second material circulation pipeline 40 of the present utility model, in the reaction kettle with a certain liquid level amount, the reaction liquid circulates through the circulation pipeline, further improving the mixing effect of the materials, thereby improving the reaction efficiency and conversion rate.

[0039] The reaction liquid in the above-mentioned primary reaction kettle 10 and secondary reaction kettle 20 needs to reach a certain liquid level to start the first circulation pump 32 and the second circulation pump 42 to achieve circulation. Specifically, a first liquid level gauge 11 is installed on the primary reaction kettle 10, and a second liquid level gauge 21 is installed on the secondary reaction kettle 20.

[0040] The device further includes a program controller, and the program controller is connected to the first liquid level gauge 11, the second liquid level gauge 21, the first flow regulating valve 33, the second flow regulating valve 51, the third flow regulating valve 43, and the fourth flow regulating valve 61.

[0041] Among them, the first liquid level gauge 11 is connected in a linkage control manner to the first flow regulating valve 33 and the second flow regulating valve 51 through the program controller.

[0042] The second liquid level gauge 21 is connected in a linkage control manner to the third flow regulating valve 43 and the fourth flow regulating valve 61 through the program controller.

[0043] The principle or method by which the program controller controls the circulation flow of the reaction liquid is:

[0044] When the program controller receives that the liquid level signal sent by the first liquid level gauge 11 reaches the set value, it sends a signal to start the first circulation pump 32 and regulates the opening degrees of the first flow regulating valve 33 and the second flow regulating valve 51. On the one hand, the reaction liquid in the primary reaction kettle is circulated and reacted inside and outside the kettle, and on the other hand, part of the reaction liquid flows into the secondary reaction kettle 20.

[0045] When the program controller receives that the liquid level signal sent by the second liquid level gauge 21 reaches the set value, it sends a signal to start the second circulation pump 42 and regulates the opening degrees of the second flow regulating valve 43 and the second flow regulating valve 61. On the one hand, the reaction liquid in the secondary reaction kettle is circulated and reacted inside and outside the kettle, and on the other hand, part of the discharging is realized;

[0046] In the above process, the continuous reaction of sodium hypophosphite is realized.

[0047] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A continuous reaction device for sodium hypophosphite, characterized in that, Comprising: A primary reactor and a secondary reactor; The primary reactor is connected to a first material circulation pipeline; the secondary reactor is connected to a second material circulation pipeline; the first material circulation pipeline is connected to the secondary reactor through a first branch pipe; a discharge branch pipe is connected to the second material circulation pipeline; The gas outlet of the secondary reactor is connected to a subsequent reaction device through a gas pipeline; a condenser is installed on the gas pipeline.

2. The continuous reaction device for sodium hypophosphite according to claim 1, wherein The gas outlet of the primary reactor is connected to the secondary reactor through a pipeline.

3. The continuous reaction device for sodium hypophosphite according to claim 2, wherein A gas-liquid separator is connected to the pipeline.

4. The continuous reaction device for sodium hypophosphite according to claim 1, characterized in that, The first material circulation pipeline includes a first circulation pipe, a first circulation pump and a first flow regulating valve. Among them, the two ends of the first circulation pipe are respectively connected to the discharge port and the return port of the primary reactor; the first circulation pump and the first flow regulating valve are installed on the first circulation pipe.

5. The continuous reaction device for sodium hypophosphite according to claim 4, wherein, The first branch pipe is connected to the first circulation pipe, and the connection point is located between the first circulation pump and the first flow regulating valve. A second flow regulating valve is installed on the first branch pipe.

6. The continuous reaction device for sodium hypophosphite according to claim 5, wherein The second material circulation pipeline includes a second circulation pipe, a second circulation pump and a third flow regulating valve. Among them, the two ends of the second circulation pipe are respectively connected to the discharge port and the return port of the secondary reactor; the second circulation pump and the third flow regulating valve are installed on the second circulation pipe.

7. The continuous reaction device for sodium hypophosphite according to claim 6, wherein, The discharge branch pipe is connected to the second circulation pipe, and the connection point is located between the second circulation pump and the third flow regulating valve. A fourth flow regulating valve is installed on the discharge branch pipe.

8. The continuous reaction device for sodium hypophosphite according to claim 7, characterized in that, A first liquid level gauge is installed on the primary reactor, and a second liquid level gauge is installed on the secondary reactor.

9. The continuous reaction device for sodium hypophosphite according to claim 8, characterized in that, The device further includes a program controller, and the program controller is connected to the first liquid level gauge, the second liquid level gauge, the first flow regulating valve, the second flow regulating valve, the third flow regulating valve and the fourth flow regulating valve; Among them, the first liquid level gauge is connected to the first flow regulating valve and the second flow regulating valve through the program controller for linkage control; The second liquid level gauge is connected to the third flow regulating valve and the fourth flow regulating valve through the program controller for linkage control.

10. The continuous reaction device for sodium hypophosphite according to claim 1, wherein, The secondary reactor is provided with a heat insulation jacket, and the heat insulation jacket is connected to hot steam.

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