Production system for producing sodium tripolyphosphate by using glyphosate byproduct sodium pyrophosphate

Abstract

The utility model discloses a production system for producing sodium tripolyphosphate by using glyphosate byproduct sodium pyrophosphate, which comprises a crusher, a discharge port of the crusher is communicated with a feed port of a rotary kiln through a pneumatic conveying system, a discharge port of the rotary kiln is communicated with a neutralization pot through a pipeline, and the neutralization pot is communicated with a discharge port of the rotary kiln through a pipeline. The neutralization pot and the flocculation tank are respectively communicated with the filtering device through pipelines, a filtrate outlet of the filtering device is communicated with the storage tank, and the storage tank is communicated with the polymerization furnace through a pipeline via the high-pressure pump. The method comprises the following steps: carrying out calcination whitening pretreatment on a byproduct sodium pyrophosphate of glyphosate, carrying out acidolysis on the byproduct sodium pyrophosphate of glyphosate to replace the traditional reaction of sodium carbonate and phosphoric acid to prepare a sodium tripolyphosphate feed liquid, and aggregating tiny impurities in the sodium tripolyphosphate feed liquid by using a flocculating agent to improve the filtering quality and the filtering rate; and atomizing the filtered feed liquid, dehydrating at high temperature, and carrying out polymerization reaction to produce sodium tripolyphosphate. According to the production process, the raw material cost of sodium tripolyphosphate is greatly reduced, the production process is simple, and the operability is high.

Description

Technical Field

[0001] This utility model relates to the field of industrial-grade sodium tripolyphosphate production, and specifically to a production system for producing sodium tripolyphosphate using sodium pyrophosphate, a byproduct of glyphosate. Background Technology

[0002] Currently, industrial sodium pentasodium mainly produces sodium tripolyphosphate using soda ash and phosphoric acid as raw materials, but this method suffers from high production costs and weak market competitiveness. With increasing market competition, this production process has been gradually phased out, and the industry is vying to use other low-cost raw materials to produce sodium tripolyphosphate in order to improve product market competitiveness. Sodium pyrophosphate, a byproduct of glyphosate production, is rich in phosphorus and sodium, and theoretically can replace phosphoric acid and soda ash in sodium tripolyphosphate production. However, due to the limitations of the production process, glyphosate-derived sodium pyrophosphate generally has low whiteness and high organic carbon content, making it unsuitable for direct use in sodium tripolyphosphate production. It requires a series of treatments in conjunction with the sodium tripolyphosphate production process before it can be used to produce qualified sodium tripolyphosphate products. Utility Model Content

[0003] To solve the above problems, this utility model provides a production system for producing sodium tripolyphosphate using sodium pyrophosphate, a byproduct of glyphosate.

[0004] The technical solution of this utility model is as follows:

[0005] A production system for producing sodium tripolyphosphate from sodium pyrophosphate, a byproduct of glyphosate, is disclosed. The system includes a crusher, the discharge port of which is connected to the feed port of a rotary kiln via a pneumatic conveying system. The discharge port of the rotary kiln is connected to a neutralization pot via a pipeline. The neutralization pot is connected to a flocculation tank via a pipeline and to a filtration device via pipelines. The filtrate discharge port of the filtration device is connected to a storage tank. The storage tank is connected to a polymerization furnace via a high-pressure pump via a pipeline.

[0006] Preferably, the neutralization pot is equipped with a phosphate tube.

[0007] Preferably, the flocculation tank is equipped with a flocculant feeding pipe.

[0008] Preferably, the discharge port of the polymerization furnace is connected to a belt cooler via an auger, the belt cooler is connected to a vertical mill and an elevator via a conveying device, and the discharge port of the vertical mill is connected to a mixer and a linear screen in sequence via a conveying device.

[0009] Preferably, the elevator is connected to the vibrating screen, and the linear screen and the vibrating screen are respectively connected to the packaging machine through a conveying device.

[0010] Preferably, the exhaust port at the top of the polymerization furnace is also connected to the rotary kiln via a pipe.

[0011] Preferably, the pneumatic conveying system is a positive pressure powder conveyor, and the filtration device is a plate filter.

[0012] The beneficial effects of this utility model are as follows:

[0013] This invention relates to a calcination-based whitening pretreatment of sodium pyrophosphate, a byproduct of glyphosate production. The sodium pyrophosphate, after acid hydrolysis, replaces the traditional reaction of soda ash and phosphoric acid to prepare sodium tripolyphosphate solution. A flocculant is used to aggregate minute impurities in the sodium tripolyphosphate solution to improve filtration quality and rate. The filtered solution is then atomized, dehydrated at high temperature, and polymerized to produce sodium tripolyphosphate. This significantly reduces the raw material cost of sodium tripolyphosphate, with a simple and highly operable production process, ensuring stable and compliant product quality. It realizes the production of sodium tripolyphosphate using sodium pyrophosphate, a byproduct of glyphosate production. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the utility model structure;

[0015] Figure 2 This is a flowchart illustrating the structural process of the utility model.

[0016] In the diagram: 1. Crusher; 2. Pneumatic conveying system; 3. Rotary kiln; 4. Phosphoric acid pipe; 5. Neutralization pot; 6. Flocculation tank; 7. Filter device; 8. Storage tank; 9. High-pressure pump; 10. Polymerization furnace; 6-1. Flocculant feeding pipe; 11. Screwdriver; 12. Belt cooler; 13. Vertical mill; 14. Elevator; 15. Mixer; 16. Linear screen; 17. Vibrating screen; 18. Packaging machine. Detailed Implementation

[0017] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. These embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0018] Example 1

[0019] Figure 1 As shown, a production system for producing sodium tripolyphosphate from sodium pyrophosphate, a byproduct of glyphosate, is disclosed. The production system includes a crusher 1. The discharge port of the crusher 1 is connected to the feed port of a rotary kiln 3 via a pneumatic conveying system 2. The discharge port of the rotary kiln 3 is connected to a neutralizing pot 5 via a pipeline. The neutralizing pot 5 is connected to a flocculation tank 6 via a pipeline and then to a filtration device 7 via pipelines. The filtrate discharge port of the filtration device 7 is connected to a storage tank 8. The storage tank 8 is connected to a polymerization furnace 10 via a high-pressure pump 9 via a pipeline.

[0020] Preferably, the neutralization pot 5 is provided with a phosphate tube 4.

[0021] Preferably, the flocculation tank 6 is equipped with a flocculant feeding pipe.

[0022] Preferably, the discharge port of the polymerization furnace 10 is connected to the belt cooler 12 via an auger 11, the belt cooler 12 is connected to the vertical mill 13 and the elevator 14 via a conveying device, and the discharge port of the vertical mill 13 is connected to the mixer 15 and the linear screen 16 in sequence via a conveying device.

[0023] Preferably, the elevator 14 is connected to the vibrating screen 17, and the linear screen 16 and the vibrating screen 17 are respectively connected to the packaging machine 18 through a conveying device.

[0024] Preferably, the exhaust port at the top of the polymerization furnace 10 is also connected to the rotary kiln 3 via a pipe.

[0025] Preferably, the pneumatic conveying system 2 is a positive pressure powder conveyor, and the filtration device 7 is a plate filter.

[0026] The specific operating procedure is as follows:

[0027] 1. The by-product sodium pyrophosphate of glyphosate is crushed into powder and fed into a rotary kiln via a pneumatic conveying system for high-temperature calcination to 600-700℃, effectively oxidizing and removing impurities such as organic carbon remaining in the by-product sodium pyrophosphate.

[0028] 2. The processed glyphosate byproduct sodium pyrophosphate is fed into a neutralization pot through a feeding system. Process water and phosphoric acid are added, and the mixture is heated with steam to undergo an acidolysis reaction, decomposing it into a mixed solution of disodium hydrogen phosphate and sodium dihydrogen phosphate. The ratio of disodium hydrogen phosphate to sodium dihydrogen phosphate is controlled to 2:1 by adjusting the amount of phosphoric acid added. After passing the inspection, the mixture proceeds to the next process.

[0029] 3. Add a certain proportion of polyacrylamide (PAM) aqueous solution to the mixed solution of disodium hydrogen phosphate and sodium dihydrogen phosphate, stir and let it stand for a while to allow the tiny organic carbon impurities in the mixed solution of disodium hydrogen phosphate and sodium dihydrogen phosphate to fully aggregate. Then filter it through a filter device to effectively intercept and remove the tiny organic carbon impurities remaining in the sodium tripolyphosphate solution.

[0030] 4. The filtered liquid is atomized, dehydrated at high temperature, and polymerized to produce sodium tripolyphosphate. After crushing and sieving, it is sold after passing inspection.

[0031] All standard parts used in this invention can be purchased from the market, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] The accompanying drawings of the embodiments disclosed in this utility model only involve structures relevant to the embodiments disclosed herein. Other structures can be referenced from common designs. Unless otherwise specified, the same and different embodiments of this invention can be combined with each other. The technical solutions of this utility model are explained through the above embodiments, but this utility model is not limited to the above embodiments, that is, it does not mean that this utility model must rely on the above specific embodiments to be implemented. Any improvements made by those skilled in the art based on this utility model, or equivalent substitutions of the materials selected in this utility model, fall within the scope of patent protection.

Claims

1. A production system for producing sodium tripolyphosphate from sodium pyrophosphate, a byproduct of glyphosate production, said production system comprising a crusher (1), characterized in that, The discharge port of the crusher (1) is connected to the feed port of the rotary kiln (3) through the pneumatic conveying system (2). The discharge port of the rotary kiln (3) is connected to the neutralizing pot (5) through a pipe. The neutralizing pot (5) is connected to the flocculation tank (6) through a pipe. The flocculation tank (6) is connected to the filter device (7) through a pipe. The filtrate discharge port of the filter device (7) is connected to the storage tank (8). The storage tank (8) is connected to the polymerization furnace (10) through a high-pressure pump (9) via a pipe.

2. The production system for producing sodium tripolyphosphate from glyphosate byproduct sodium pyrophosphate according to claim 1, characterized in that: The neutralization pot (5) is equipped with a phosphate tube (4).

3. The production system for producing sodium tripolyphosphate from glyphosate byproduct sodium pyrophosphate according to claim 1, characterized in that: The flocculation tank (6) is equipped with a flocculant feeding pipe.

4. The production system for producing sodium tripolyphosphate from glyphosate byproduct sodium pyrophosphate according to claim 1, characterized in that: The discharge port of the polymerization furnace (10) is connected to the belt cooler (12) via an auger (11). The belt cooler (12) is connected to the vertical mill (13) and the elevator (14) via a conveying device. The discharge port of the vertical mill (13) is connected to the mixer (15) and the linear screen (16) in sequence via a conveying device.

5. The production system for producing sodium tripolyphosphate from glyphosate byproduct sodium pyrophosphate according to claim 4, characterized in that: The elevator (14) is connected to the vibrating screen (17), and the linear screen (16) and the vibrating screen (17) are connected to the packaging machine (18) through the conveying device.

6. The production system for producing sodium tripolyphosphate from glyphosate byproduct sodium pyrophosphate according to claim 1, characterized in that: The exhaust port at the top of the polymerization furnace (10) is also connected to the rotary kiln (3) via a pipe.

7. The production system for producing sodium tripolyphosphate from glyphosate byproduct sodium pyrophosphate according to claim 1, characterized in that: The pneumatic conveying system (2) is a positive pressure powder conveyor, and the filtration device (7) is a plate filter.

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