Preparation system of thiosulfate solution

Abstract

The invention discloses a preparation system of a thiosulfate solution. The preparation system comprises a reaction kettle, a stirrer arranged in the reaction kettle, a heat exchange water jacket arranged on the outer wall of the reaction kettle in a surrounding manner, a quantitative feeding hopper for feeding a liquid reactant into the reaction kettle, and a gas conveying pipe for feeding a gas reactant into the reaction kettle, a liquid distribution mechanism is arranged in the reaction kettle, and a liquid extraction pipe for communicating the liquid distribution mechanism with a solution in the reaction kettle is arranged outside the reaction kettle; and a gas distribution mechanism communicated with the gas delivery pipe is arranged in the reaction kettle. According to the invention, the spraying direction of the sulfur dioxide gas is always in the water spraying center of the atomizing nozzle, so that the escape of sulfur dioxide is reduced, and the sulfur dioxide gas is fully contacted and reacted with reactants; the gas reactants and the liquid reactants can fully react, the reaction efficiency is high, meanwhile, the tail gas absorption treatment device absorbs tail gas, and the environmental pollution problem is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of thiosulfate preparation, and in particular to a system for preparing a thiosulfate solution. Background Art

[0002] Persulfate is widely used in chemical industry, textile industry, electronic industry, and metallurgical industry. The low-cost and efficient preparation of persulfate is of great significance. At present, the production of persulfate in my country is mainly divided into electrolysis and chemical methods. The industrial preparation of sodium thiosulfate includes a separatory funnel, an electric stirrer, a water bath heating device, a filtering device, a washing device, a drying device, and an evaporation crystallization device.

[0003] In the prior art, application number 202023278914.4 discloses a sodium thiosulfate preparation device, including a shell, a first heating plate, a partition, a filter screen, a second heating plate, a telescopic device, a first slider and a sliding plate; two groups of partitions divide the interior of the shell from top to bottom into an upper prefabricated bin, a filter bin and a lower preparation bin; a mounting bin is provided in the partition, and a mounting groove, a through hole and a first slide are provided on the upper end face of the partition; the sliding plate is slidably arranged in the mounting groove, and the sliding plate is connected to the first slider; the first slider is slidably connected to the first slide; the telescopic device is installed in the installation bin, and the telescopic end of the telescopic device is connected to the first slider; the second heating plate is installed on the inner wall of the upper prefabricated bin; the filter bin is provided with a cleaning door on the shell; the two ends of the filter screen are respectively slidably connected to the two groups of partitions; the lower preparation bin is provided with a material taking door on the shell; the first heating plate is installed on the inner wall of the lower preparation bin. The utility model effectively reduces the volume of the preparation device, which is convenient for preparing sodium thiosulfate.

[0004] In the prior art, patent application No. 201721099247.9 discloses a novel sodium thiosulfate preparation method.

[0005] The upper box with the first stirring device is connected to the middle of the upper end of the lower box with the second stirring device through a connecting pipe arranged at its lower end, a valve is installed on the connecting pipe, an air distributor is arranged at the inner bottom of the upper box, the end of the air inlet pipe arranged on the side wall of the upper box extends below the liquid level in the upper box and is connected to the air distributor, the outer wall of the upper box and the outer wall of the lower box are respectively fixed with a first heating jacket and a second heating jacket, the upper box and the lower box are both provided with exhaust pipes, the upper box and the lower box are both provided with liquid inlet pipes, and the lower end of the lower box is also provided with a liquid discharge pipe and a supporting leg. The technical solution of the present application is to combine the raw material synthesis with the sodium thiosulfate production, reduce the equipment investment, improve the synthesis efficiency, and reduce the production cost, and is particularly suitable for the synthesis of a small amount of sodium thiosulfate in the laboratory.

[0006] However, in the prior art, when preparing thiosulfate, the gaseous reactants and the liquid reactants are not easily in full contact, which affects the reaction efficiency. Summary of the invention

[0007] The object of the present invention is to provide a system for preparing a thiosulfate solution, so as to solve the problem that a gas reactant and a liquid reactant are not convenient to fully contact in conventional thiosulfate.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention provides a system for preparing a thiosulfate solution, comprising a reactor, a stirrer arranged in the reactor, a heat exchange water jacket arranged around the outer wall of the reactor, a quantitative feed hopper for feeding liquid reactants into the reactor, and a gas pipe for feeding gaseous reactants into the reactor;

[0010] A plurality of feed pipes are arranged at the bottom of the reactor, and a tail gas absorption tower is connected to the top of the reactor through a tail gas pipe;

[0011] A liquid distribution mechanism is arranged in the reactor, a liquid extraction pipe connecting the liquid distribution mechanism and the solution in the reactor is arranged outside the reactor, and a second circulation pump is arranged on the liquid extraction pipe;

[0012] A gas distribution mechanism connected to the gas delivery pipe is arranged in the reactor.

[0013] Furthermore, a pressure sensor is also arranged in the reactor; the agitator includes a stirring shaft arranged in the reactor, stirring blades arranged on the stirring shaft, and a stirring motor arranged on the top of the reactor and used to drive the stirring shaft.

[0014] Furthermore, a plurality of feed pipes are arranged on the top of the reactor, and a conveying auger is coaxially arranged inside the feed pipe; a side wall discharge pipe is arranged on the bottom side wall of the feed pipe, and a solenoid valve is arranged on the side wall discharge pipe; wherein the power output shaft of the conveying auger extends out of the lower end of the feed pipe and is driven by a motor; sprockets are arranged on the power output shafts of the plurality of conveying augers, and are connected through a transmission chain.

[0015] Furthermore, the exterior of the water exchange jacket is made of heat insulating material, the bottom side wall of the water exchange jacket is connected to a water exchange tank through a delivery pipe, and a first circulation pump and a front-end temperature sensor are arranged on the delivery pipe;

[0016] The top of the water exchange jacket conveys the circulating working medium to the water exchange tank through a return pipe, and a rear-end temperature sensor is arranged on the return pipe; a temperature control heater is arranged in the water exchange tank.

[0017] Furthermore, the tail gas absorption tower includes a multi-layer first spray rack arranged therein, a packing layer arranged below the first spray rack, an absorption liquid collecting tank and a first circulation pump and a circulation pipe for providing absorption liquid to the first spray rack; wherein the absorption liquid collecting tank is connected to the bottom of the tail gas absorption tower.

[0018] Furthermore, a filter cover is provided at the liquid extraction end of the liquid extraction tube.

[0019] Furthermore, the liquid distribution mechanism includes a second spray rack and a plurality of spray heads arranged on the second spray rack, wherein the spray heads are connected to the liquid outlet end of the liquid extraction pipe through a corrosion-resistant pipeline.

[0020] Furthermore, an air distribution mechanism is arranged below the second spray rack, and the air distribution mechanism includes an air distribution rack and first air jet joints uniformly arranged on the air distribution rack, and the first air jet joints are connected to the air supply pipe through a corrosion-resistant pipe.

[0021] Furthermore, an air distribution mechanism is arranged below the second spray rack, and the air distribution mechanism includes a plurality of second jet connectors evenly spaced apart on the inner wall of the reactor; wherein each of the second jet connectors is connected to the gas supply pipe and is respectively located below the second spray rack.

[0022] Furthermore, the liquid distribution mechanism includes an air distribution spray rack; a plurality of air holes are evenly opened in the longitudinal direction of the air distribution spray rack, and a stirrer through hole is opened in the center of the air distribution spray rack; a spray liquid cavity connected to the liquid outlet end of the liquid extraction pipe is formed in the air distribution spray rack; a plurality of atomizing nozzles connected to the spray liquid cavity are arranged at the bottom of the air distribution spray rack;

[0023] The air distribution mechanism includes a coiled air guide pipe preset in the spray liquid cavity; an air injection conduit extending out of the atomizing nozzle is arranged on the air guide pipe;

[0024] A plurality of spray holes surrounding the spray conduit are provided at the bottom of the atomizing nozzle.

[0025] Compared with the prior art, the beneficial technical effects of the present invention are:

[0026] In the present invention, the spray direction of sulfur dioxide gas is always in the water spray center of the atomizing nozzle, thereby reducing the escape of sulfur dioxide and allowing the sulfur dioxide gas to fully contact and react with the reactants; wherein the gas reactants and liquid reactants in the present application can fully react with high reaction efficiency, while the tail gas absorption treatment device absorbs the tail gas to reduce environmental pollution problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 Schematic diagram of the structure of the system for preparing the thiosulfate solution of the present invention in Example 1;

[0029] Figure 2 For Example 1 Figure 1 The enlarged schematic diagram at A in the middle;

[0030] Figure 3 Schematic diagram of the structure of the system for preparing the thiosulfate solution of the present invention in Example 2;

[0031] Figure 4 This is a schematic diagram of an air distribution spray rack in the preparation system of the thiosulfate solution of the present invention in Example 2;

[0032] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0033] Figure 6 This is a schematic diagram of the external structure of the air distribution spray rack in the preparation system of the thiosulfate solution of the present invention in Example 2;

[0034] Figure 7 This is a schematic diagram of the installation of the second jet connector in the system for preparing the thiosulfate solution of the present invention in Example 3.

[0035] Explanation of the reference numerals: 1. Reactor; 101. Agitator; 102. Agitator motor; 103. Quantitative feed hopper; 104. Pressure sensor; 105. Feeding pipe; 1051. Side wall discharge pipe; 1052. Conveying auger; 1053. Solenoid valve; 1054. Transmission chain; 2. Heat exchange water jacket; 3. Heat exchange water tank; 301. First circulation pump; 302. Conveying pipe; 303. Front temperature sensor; 304. Rear temperature sensor; 305. Reflux pipe; 4. Tail gas absorption tower; 401. Tail gas pipe; 402. First Spray rack; 403, packing layer; 404, absorption liquid collecting box; 405, first circulation pump; 5, second spray rack; 501, nozzle; 6, air distribution rack; 601, first jet joint; 7, exhaust fan; 701, air supply pipe; 702, second jet joint; 8, second circulation pump; 801, liquid extraction pipe; 802, filter cover; 9, air distribution spray rack; 901, air vent; 902, agitator through hole; 903, spray liquid cavity; 904, air guide pipe; 905, atomizing nozzle; 9051, spray hole; 906, jet duct. DETAILED DESCRIPTION

[0036] Example 1

[0037] like Figure 1As shown, this embodiment discloses a system for preparing a thiosulfate solution, and its reaction principle formula is:

[0038] 2Na2S+Na2CO3+4SO2=3Na2S2O3+CO2.

[0039] like Figure 1 As shown, this embodiment discloses a system for preparing a thiosulfate solution, comprising a reactor 1, an agitator 101 installed in the reactor 1, a water exchange jacket 2 installed around the outer wall of the reactor 1, a quantitative feed hopper 103 for feeding liquid reactants into the reactor 1, and a gas pipe 701 for feeding gaseous reactants into the reactor 1; wherein the liquid reactants are Na2S and Na2CO3 solutions, and the gaseous reactant is SO2.

[0040] A pressure sensor 104 is also installed in the reactor 1 for detecting the air pressure in the reactor 1; the agitator 101 includes a stirring shaft installed in the reactor 1, stirring blades installed on the stirring shaft, and a stirring motor 102 installed on the top of the reactor 1 and used to drive the stirring shaft; when in use, the reaction efficiency is improved by the agitator 101.

[0041] In this embodiment, a plurality of feed pipes 105 are installed at the bottom of the reactor 1 , and a tail gas absorption tower 4 is connected to the top of the reactor 1 through a tail gas pipe 401 .

[0042] like Figure 1 As shown, the outside of the water exchange jacket 2 is made of heat-insulating material, and the bottom side wall of the water exchange jacket 2 is connected to a water exchange tank 3 through a delivery pipe 302, and a first circulation pump 301 and a front-end temperature sensor 303 are installed on the delivery pipe 302. The top of the water exchange jacket 2 delivers the circulating medium to the water exchange tank 3 through a return pipe 305, and a rear-end temperature sensor 304 is installed on the return pipe 305; a temperature control heater is installed in the water exchange tank 3; so that it is convenient to control and adjust the temperature control heater installed in the water exchange tank 3 to adjust the power according to the temperature changes detected by the front-end temperature sensor 303 and the rear-end temperature sensor 304.

[0043] like Figure 2As shown, a plurality of feed pipes 105 are installed on the top of the reactor 1, and a conveying auger 1052 is coaxially installed in the feed pipe 105; a side wall discharge pipe 1051 is installed on the bottom side wall of the feed pipe 105, and a solenoid valve 1053 is installed on the side wall discharge pipe 1051; wherein the power output shaft of the conveying auger 1052 extends out of the lower end of the feed pipe 105 and is driven by a motor; a sprocket is installed on the power output shaft of the plurality of conveying auger 1052, and is connected by a transmission chain 1054. Since the reaction product, the sea wave, is a crystal, based on this, in order to facilitate the discharge of the reaction product, the conveying auger 1052 can be used for rotation and transportation; specifically, a scraper can be installed at the bottom of the stirring shaft to facilitate the discharge of the material by contacting with the inner bottom surface of the reactor 1.

[0044] In this embodiment, the tail gas absorption tower 4 includes a multi-layer first spray rack 402 installed therein, a packing layer 403 installed below the first spray rack 402, an absorption liquid collecting tank 404 and a first circulation pump 405 and a circulation pipe for providing absorption liquid to the first spray rack 402; wherein the absorption liquid collecting tank 404 is connected to the bottom of the tail gas absorption tower 4; wherein since the reactant gas sulfur dioxide is excessively input, it is bound to cause part of the gas to not be fully absorbed, and specifically, the part of the escaped sulfur dioxide can be absorbed by alkaline solution, specifically, calcium hydroxide solution can be used.

[0045] In this embodiment, Figure 1 As shown, a liquid distribution mechanism is installed in the reactor 1, a liquid extraction pipe 801 connecting the liquid distribution mechanism and the solution in the reactor 1 is installed outside the reactor 1, and a second circulation pump 8 is installed on the liquid extraction pipe 801; a gas distribution mechanism connected to the gas supply pipe 701 is installed in the reactor 1.

[0046] A filter cover 802 is installed at the liquid extraction end of the liquid extraction tube 801 to prevent blockage when circulating the reactants.

[0047] In this embodiment, the liquid distributing mechanism includes a second spray frame 5 and a plurality of spray heads 501 installed on the second spray frame 5, wherein the spray heads 501 are connected to the liquid outlet end of the liquid extraction pipe 801 through a corrosion-resistant pipeline.

[0048] An air distribution mechanism is installed below the second spray rack 5, and the air distribution mechanism includes an air distribution rack 6 and a first jet connector 601 evenly installed on the air distribution rack 6, and the first jet connector 601 is connected to the gas supply pipe 701 through a corrosion-resistant pipe; so that the sulfur dioxide sprayed from the first jet connector 601 on the air distribution rack 6 can fully react with the Na2S and Na2CO3 solutions.

[0049] Example 2

[0050] On the basis of Example 1, the liquid distribution mechanism and the gas distribution mechanism are improved.

[0051] The liquid distribution mechanism includes an air distribution spray rack 9; a plurality of air holes 901 are evenly opened in the longitudinal direction of the air distribution spray rack 9, and a stirrer through hole 902 is opened in the center of the air distribution spray rack 9; a spray liquid cavity 903 connected to the liquid outlet end of the liquid extraction pipe 801 is formed in the air distribution spray rack 9; a plurality of atomizing nozzles 905 connected to the spray liquid cavity 903 are installed at the bottom of the air distribution spray rack 9. The air distribution mechanism includes an air guide pipe 904 pre-set in a coiled shape in the spray liquid cavity 903; an air jet conduit 906 extending out of the atomizing nozzle 905 is installed on the air guide pipe 904; and a plurality of spray holes 9051 surrounding the air jet conduit 906 are opened at the bottom of the atomizing nozzle 905.

[0052] When in use, the spraying direction of the sulfur dioxide gas is always at the water spraying center of the atomizing nozzle 905, thereby reducing the escape of sulfur dioxide and allowing the sulfur dioxide gas to fully contact and react with the reactants.

[0053] Example 3

[0054] In this embodiment, an air distribution mechanism is installed below the second spray rack 5, and the air distribution mechanism includes a plurality of second jet connectors 702 evenly spacedly installed on the inner wall of the reactor 1; wherein each of the second jet connectors 702 is connected to the gas supply pipe 701 and is respectively located below the second spray rack 5.

[0055] like Figure 7 As shown, when in use, the jetting direction of the second jet connector 702 is perpendicular to the liquid spraying direction of the second spray rack 5, so as to facilitate sufficient gas-liquid contact.

[0056] The above embodiments are only descriptions of the preferred methods of the invention, and are not intended to limit the scope of the invention. Without departing from the design spirit of the invention, various modifications and improvements made to the technical solutions of the invention by ordinary technicians in this field should fall within the protection scope of the claims of the invention.

Claims

1. A system for preparing a thiosulfate solution, characterized in that: It comprises a reaction kettle (1), a stirrer (101) arranged in the reaction kettle (1), a heat exchange water jacket (2) arranged around the outer wall of the reaction kettle (1), a quantitative feed hopper (103) for feeding liquid reactants into the reaction kettle (1), and a gas delivery pipe (701) for feeding gaseous reactants into the reaction kettle (1); A plurality of feed pipes (105) are provided at the bottom of the reactor (1), and a tail gas absorption tower (4) is connected to the top of the reactor (1) via a tail gas pipe (401); A liquid distribution mechanism is provided in the reaction kettle (1), a liquid extraction pipe (801) is provided outside the reaction kettle (1) and is connected between the liquid distribution mechanism and the solution in the reaction kettle (1), and a second circulation pump (8) is provided on the liquid extraction pipe (801); A gas distribution mechanism connected to the gas delivery pipe (701) is arranged in the reaction kettle (1).

2. The system for preparing thiosulfate solution according to claim 1, characterized in that: A pressure sensor (104) is also provided in the reactor (1); the stirrer (101) comprises a stirring shaft provided in the reactor (1), stirring blades provided on the stirring shaft, and a stirring motor (102) provided on the top of the reactor (1) and used for driving the stirring shaft.

3. The system for preparing thiosulfate solution according to claim 2, characterized in that: A plurality of feed pipes (105) are arranged on the top of the reactor (1), and a conveying auger (1052) is coaxially arranged inside the feed pipe (105); a side wall discharge pipe (1051) is arranged on the bottom side wall of the feed pipe (105), and a solenoid valve (1053) is arranged on the side wall discharge pipe (1051); the power output shaft of the conveying auger (1052) extends out of the lower end of the feed pipe (105) and is driven by a motor; sprockets are arranged on the power output shafts of the plurality of conveying augers (1052), and are connected in transmission via a transmission chain (1054).

4. The system for preparing thiosulfate solution according to claim 3, characterized in that: The exterior of the water exchange jacket (2) is made of heat-insulating material, the bottom side wall of the water exchange jacket (2) is connected to a water exchange tank (3) via a delivery pipe (302), and a first circulation pump (301) and a front-end temperature sensor (303) are arranged on the delivery pipe (302); The top of the water exchange jacket (2) transports the circulating working medium to the water exchange tank (3) via a return pipe (305), and a rear-end temperature sensor (304) is arranged on the return pipe (305); a temperature control heater is arranged in the water exchange tank (3).

5. The system for preparing thiosulfate solution according to claim 4, characterized in that: The tail gas absorption tower (4) comprises a multi-layer first spray frame (402) arranged therein, a packing layer (403) arranged below the first spray frame (402), an absorption liquid collecting tank (404) for providing absorption liquid to the first spray frame (402), a first circulation pump (405) and a circulation pipe; wherein the absorption liquid collecting tank (404) is connected to the bottom of the tail gas absorption tower (4).

6. The system for preparing thiosulfate solution according to claim 5, characterized in that: A filter cover (802) is provided at the liquid extraction end of the liquid extraction tube (801).

7. The system for preparing thiosulfate solution according to claim 6, characterized in that: The liquid distribution mechanism comprises a second spray frame (5) and a plurality of spray heads (501) arranged on the second spray frame (5), wherein the spray heads (501) are connected to the liquid outlet end of the liquid extraction pipe (801) through a corrosion-resistant pipeline.

8. The system for preparing thiosulfate solution according to claim 7, characterized in that: An air distribution mechanism is arranged below the second spray rack (5), the air distribution mechanism comprising an air distribution rack (6), and first air jet connectors (601) uniformly arranged on the air distribution rack (6), the first air jet connectors (601) being connected to the air delivery pipe (701) via a corrosion-resistant pipe.

9. The system for preparing thiosulfate solution according to claim 7, characterized in that: An air distribution mechanism is arranged below the second spray rack (5), and the air distribution mechanism comprises a plurality of second air jet connectors (702) arranged at even intervals on the inner wall of the reactor (1); wherein each of the second air jet connectors (702) is connected to the air supply pipe (701) and is respectively located below the second spray rack (5).

10. The system for preparing thiosulfate solution according to claim 6, characterized in that: The liquid distribution mechanism comprises an air distribution spray rack (9); a plurality of air holes (901) are evenly arranged in the longitudinal direction of the air distribution spray rack (9); a stirrer through hole (902) is arranged in the center of the air distribution spray rack (9); a spray liquid cavity (903) connected to the liquid outlet end of the liquid extraction pipe (801) is formed in the air distribution spray rack (9); a plurality of atomizing nozzles (905) connected to the spray liquid cavity (903) are arranged at the bottom of the air distribution spray rack (9); The air distribution mechanism comprises a coiled air guide pipe (904) preset in the spray liquid chamber (903); the air guide pipe (904) is provided with an air injection conduit (906) extending out of the atomizing nozzle (905); A plurality of spray holes (9051) surrounding the spray conduit (906) are provided at the bottom of the atomizing nozzle (905).

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