Sodium chloroacetate synthesis and refining production device
The sodium chloroacetate production unit, which recycles carbon dioxide and mother liquor, solves the problems of high cost and environmental protection, and realizes low-carbon and environmentally friendly sodium chloroacetate production.
Patent Information
- Application Number
- CN202520011892.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-03
AI Technical Summary
The existing sodium chloroacetate production process increases costs by using expensive imported A1 grade raw materials or cheap A3 grade raw materials, and it is difficult to treat carbon dioxide and exhaust gas, thus failing to meet low-carbon and environmental protection requirements.
The production equipment includes a waste gas treatment device, a reaction vessel, a vacuum unit, a filter press, and a vacuum dryer. By recycling carbon dioxide and mother liquor, and combining the exhaust gas treatment with the vacuum unit, emissions can meet standards.
To reduce production costs, achieve the recycling of carbon dioxide and liquids, reduce waste gas emissions, and meet low-carbon and environmental protection requirements.
Smart Images
Figure CN223818674U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a production apparatus for sodium chloroacetate. Background Technology
[0002] Because existing chloroacetic acid enterprises in my country are unable to produce A1 grade chloroacetic acid, the current sodium chloroacetate production process mostly uses imported A1 grade chloroacetic acid as raw material to ensure that the sodium dichloroacetate content in the finished product is <100ppm. However, its price is high, which increases production costs. If A3 grade chloroacetic acid is used, its price is lower, but the process steps are more numerous. The current production equipment is difficult to treat and recover the carbon dioxide, reaction liquid, and tail gas generated in the process, resulting in a large amount of wastewater and waste gas emissions, which cannot meet the requirements of low carbon and environmental protection. Summary of the Invention
[0003] The purpose of this invention is to address the aforementioned shortcomings of the existing technology by providing a sodium chloroacetate synthesis and refining production apparatus. This apparatus not only reduces production costs but also enables the recycling of carbon dioxide and liquids, and achieves compliant emissions for exhaust gas treatment, thus meeting the requirements of low carbon and environmental protection.
[0004] To achieve the above objectives, this utility model provides a sodium chloroacetate synthesis and refining production apparatus, comprising a waste gas treatment device, a reaction vessel equipped with a jacket and a stirrer, three high-level tanks and a solid material silo, each connected to the reaction vessel via its own discharge pipe, each discharge pipe equipped with a discharge valve, and a discharge pipe connected to the bottom of the reaction vessel, the discharge pipe equipped with a discharge valve; characterized in that: the upper gas phase zone of the reaction vessel is connected to a high-level tank via an exhaust pipe, the high-level tank being connected to the waste gas treatment device via a waste gas pipe and a valve; the gas phase zone of the reaction vessel is connected to the inlet of a vacuum unit via a pipe equipped with a valve, the outlet of the vacuum unit being connected to the waste gas pipe via a valve; the other end of the discharge pipe is connected to the inlet of a filter press and a centrifuge via a valve, the outlet of the filter press being connected to the reaction vessel, a vacuum dryer is provided behind the centrifuge, the outlet of the centrifuge being connected to the reaction vessel via a circulation pipe; the exhaust port of the vacuum dryer is connected to the inlet of the vacuum unit via a valve;
[0005] In use, 30% liquid alkali is introduced into two high-level tanks. Purified water is added to the reaction vessel from another high-level tank. A3 grade chloroacetic acid is added from the solid silo, and the stirrer is turned on to dissolve it. The reaction vessel is cooled by the jacket. Solid powdered sodium bicarbonate is added to the solid silo in batches. The sodium bicarbonate neutralizes the chloroacetic acid to pH 2-3. Cooling is stopped, and the reaction is stirred. The carbon dioxide produced by the reaction enters the corresponding high-level tank through the exhaust pipe and is collected by the liquid alkali there. The sodium bicarbonate and sodium carbonate produced are used to neutralize the next batch of chloroacetic acid. The process is repeated in this cycle; the waste gas in the high-level tank is treated by a waste gas treatment device before being discharged; liquid alkali from another high-level tank is added to the reactor for reaction; the filter press is turned on and circulated for 0.5-1 hours to remove solid impurities from the reaction liquid; the vacuum unit is turned on to concentrate the reaction liquid; then the reactor is cooled and allowed to crystallize; the crystals in the reactor are centrifuged and washed with water, the solids are added to a vacuum dryer for drying, and the mother liquor is recycled multiple times in the reactor, then concentrated and crystallized to produce A4 grade sodium chloroacetate, with no process wastewater discharge. This device can realize the recycling of carbon dioxide and mother liquor, reducing carbon dioxide emissions and sodium bicarbonate procurement costs. The waste gas from the vacuum dryer is treated by the vacuum unit and waste gas pipe into the waste gas treatment device before being discharged in compliance with standards, meeting the requirements of low carbon and environmental protection.
[0006] As a further improvement of this utility model, a dosing head is provided at the bottom of the discharge pipe of another of the three high-level tanks;
[0007] As a further improvement of this utility model, a defoaming plate is fixedly connected to the stirring shaft of the stirrer in the reaction vessel, and several conical spikes are fixedly connected to the defoaming plate; this can defoam the contents of the vessel, which is beneficial for complete reaction.
[0008] As a further improvement of this utility model, the discharge port of the vacuum dryer is connected to the packaging machine, and the exhaust gas outlet of the packaging machine is connected to the exhaust gas treatment device; thus, the product can be packaged and the exhaust gas can be treated.
[0009] In summary, this invention not only reduces production costs but also enables the recycling of carbon dioxide and liquids, and achieves compliant emissions for exhaust gas treatment, thus meeting the requirements of low-carbon and environmental protection. Attached Figure Description
[0010] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation
[0011] The present invention will now be described in further detail with reference to the accompanying drawings.
[0012] like Figure 1As shown, this embodiment of a sodium chloroacetate synthesis and refining production apparatus includes a waste gas treatment device 1, a reaction vessel 4 equipped with a jacket 2 and a stirrer 3, the waste gas treatment device 1 being equipped with water and alkali spray heads and an activated carbon adsorption layer, a defoaming plate 12 fixedly connected to the stirring shaft of the stirrer 3, and several conical spikes 13 fixedly connected to the defoaming plate 12; three high-level tanks 5, 6, and 7 and a solid material silo 9 are all connected to the reaction vessel 4 through their respective discharge pipes, each discharge pipe being equipped with a discharge valve 10, and a titration head 8 being provided at the bottom of the discharge pipe of the high-level tank 7; a discharge pipe 21 is connected to the bottom of the reaction vessel 4, and a discharge valve 11 is provided on the discharge pipe 21; the upper gas phase zone of the reaction vessel 4 is connected to the high-level tank 6 through an exhaust pipe 16, and the high-level tank 6 is connected to the reaction vessel 4 through a waste gas pipe 17 and a valve 2. 7 is connected to the waste gas treatment device 1; the gas phase zone of the reactor 4 is connected to the inlet of the vacuum unit 18 through a pipe, and a valve 19 is provided on the pipe. The outlet of the vacuum unit 18 is connected to the waste gas pipe 17 through a valve 28; the other end of the discharge pipe 21 is connected to the inlet of the filter press 22 and the centrifuge 23 through two valves 31 and 32 respectively. The outlet of the filter press 22 is connected to the reactor 4 through a return pipe. A vacuum dryer 24 is provided on the rear side of the centrifuge 23. The liquid outlet of the centrifuge 23 is connected to the reactor 4 through a circulation pipe; the exhaust port of the vacuum dryer 24 is also connected to the inlet of the vacuum unit 18 through a valve 29. The discharge port of the vacuum dryer 24 is connected to the packaging machine 26. The waste gas outlet of the packaging machine 26 is connected to the waste gas treatment device 1.
[0013] In operation, purified water is added to the high-level tank 5, and 30% liquid alkali is added to both high-level tanks 6 and 7. A3 grade chloroacetic acid is first added to the solid silo 9. During operation, the corresponding discharge valve 10 is opened, and the purified water from the high-level tank 5 and the A3 grade chloroacetic acid from the solid silo 9 are added to the reaction vessel 4. The stirrer 3 is started to stir and dissolve the alkali. Cooling water is introduced through the jacket 2 to cool the reaction vessel 4. Solid powdered sodium bicarbonate is added to the solid silo 9 in batches. The sodium bicarbonate neutralizes the chloroacetic acid to a suitable pH value. Cooling is stopped, and the reaction is stirred for a period of time. The carbon dioxide produced by the reaction enters the high-level tank 6 through exhaust 16 and is absorbed by the liquid alkali therein. The resulting sodium bicarbonate and sodium carbonate are used for neutralization of the next batch of chloroacetic acid, and this cycle continues. The waste gas in the high-level tank 6 is treated by the waste gas treatment device 1 before being discharged. The liquid alkali from the high-level tank 7 is added dropwise into the reaction vessel 4 through the dropper 8 to control the feeding rate, and the reaction temperature is controlled by the jacket 2. Turn on the filter press 22 and circulate the reaction liquid in the reactor 4 for 0.5-1 hour to remove solid impurities. Close all other discharge valves 10 or discharge valves 11 except valve 19. Turn on the vacuum unit 18 and vaporize and concentrate the water in the reaction liquid through negative pressure. Cool the reactor and let it stand to crystallize. Centrifuge the crystals in the reactor 4 and wash them with water using centrifuge 23. The solids can be manually fed or conveyed by belt into the vacuum dryer 24 for drying. The separated mother liquor is recycled into the reactor 4 multiple times and then concentrated and crystallized to produce A4 grade sodium chloroacetate. The remaining mother liquor can be used to produce betaine series products. There is no process wastewater discharge. After drying the solid powder, it is put into the packaging machine 26 for packaging. The exhaust gas from the vacuum dryer 24 enters the exhaust gas treatment device 1 for treatment through the vacuum unit 18 and steam. The exhaust gas from the packaging machine is also treated by the exhaust gas treatment device 1 and discharged in compliance with standards. This device can obtain refined sodium chloroacetate using A3 grade chloroacetic acid, saving about 40% of the cost of A1 grade chloroacetic acid. This not only reduces production costs but also enables the recycling of carbon dioxide and mother liquor, reducing carbon dioxide emissions and sodium bicarbonate procurement costs. All waste gases are treated to meet emission standards, satisfying the requirements of low carbon and environmental protection.
[0014] The defoaming plate 12 and the cone-shaped spikes 13 can defoam the contents of the vessel, which is beneficial for complete reaction.
[0015] The present invention has been described through the above embodiments. However, it should be understood that the above embodiments are only for the purpose of illustration and explanation, and are not intended to limit the present invention to the scope of the described embodiments.
Claims
1. A sodium chloroacetate synthesis and refining production apparatus, comprising a waste gas treatment device, a reaction vessel equipped with a jacket and a stirrer, three high-level tanks and a solid material silo, each connected to the reaction vessel via its respective discharge pipe, each discharge pipe being equipped with a discharge valve, and a discharge pipe connected to the bottom of the reaction vessel, the discharge pipe being equipped with a discharge valve; characterized in that: The upper gas phase zone of the reactor is connected to a high-level tank via an exhaust pipe. This high-level tank is connected to a waste gas treatment device via an exhaust pipe and valves. The gas phase zone of the reactor is connected to the inlet of a vacuum unit via a pipe equipped with a valve. The outlet of the vacuum unit is connected to the exhaust pipe via a valve. The other end of the discharge pipe is connected to the inlet of a filter press and a centrifuge via a valve. The outlet of the filter press is connected to the reactor. A vacuum dryer is located behind the centrifuge. The outlet of the centrifuge is connected to the reactor via a circulation pipe. The exhaust port of the vacuum dryer is connected to the inlet of the vacuum unit via a valve.
2. The sodium chloroacetate synthesis and refining production apparatus according to claim 1, characterized in that: One of the three high-level tanks has a dripping head at the bottom of its feed pipe.
3. A sodium chloroacetate synthesis and refining production apparatus according to claim 1 or 2, characterized in that: A defoaming plate is fixedly connected to the stirring shaft of the agitator inside the reactor, and several conical spikes are fixedly connected to the defoaming plate.
4. The sodium chloroacetate synthesis and refining production apparatus according to claim 3, characterized in that: The discharge port of the vacuum dryer is connected to the packaging machine, and the exhaust outlet of the packaging machine is connected to the exhaust gas treatment device.