One-step method and device for production of phosphonate by yellow phosphorus

A phosphate and yellow phosphorus technology, applied in phosphoric acid, phosphorus oxyacid, etc., can solve the problems of limiting waste heat recovery efficiency, occupying combustion space, increasing equipment investment, etc., saving raw materials and equipment investment, and avoiding the discharge of acid mist , the effect of reducing thermal pollution

Inactive Publication Date: 2008-02-06
罗宗恬 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the waste heat recovery device of this patent is installed in the combustion tower, it occupies a certain amount of combustion space, which not only makes the equipment relatively large and increases equipment investment, but also limits the recovery efficiency of waste heat, making the recovery rate of waste heat up to 60%.
And for the industrial process of preparing phosphate with yellow phosphorus, the method of thermal phosphoric acid is still widely used at present, and there is no bibliographical report that yellow phosphorus is burned to generate phosphorus pentoxide and then directly reacts with alkali to generate phosphate

Method used

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  • One-step method and device for production of phosphonate by yellow phosphorus
  • One-step method and device for production of phosphonate by yellow phosphorus

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Experimental program
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Effect test

Embodiment 1

[0020] As shown in Figure 2, the yellow phosphorus one-step method production phosphate device of the present invention comprises the sequentially connected phosphorus melting tank 1, phosphorus spraying gun 2, phosphorus burning furnace 3 that is arranged on the front stage process flow, is arranged on the back stage process flow The absorption tower 10 also includes the P that is arranged between the phosphorus burning furnace 3 and the absorption tower 10, and its two ends are respectively connected with the phosphorus burning furnace 3 through the pipeline 4 and the pipeline 9. 2 o 5 The gas outlet is connected to the inlet of the absorption tower 10 to execute the waste heat boiler 5 of the middle process flow. In the cavity of the waste heat boiler 5, tube rows 6 for heat exchange with water are arranged and fixed. 13 and the inner wall of the waste heat boiler 5 separately constitute the P 2 o 5 The gas gathers delivery chambers 11 , 12 . The phosphorus furnace 3 ha...

Embodiment 2

[0022] Add solid yellow phosphorus into the phosphorus melting tank 1 to make it melt into a liquid state at 55-90°C; under the action of compressed air in the phosphorus spray gun 2, the liquid yellow phosphorus is automatically sprayed into the phosphorus furnace through the phosphorus spray gun 2 Combustion in 3, release a large amount of heat energy at the same time, the generation temperature is 1000~1600℃P 2 o 5 Gas; the gas is introduced into the waste heat boiler 5 through the pipeline 4, enters the tube row 6 through the gas distributor 13, and performs heat exchange with the cooling water around the tube row 6, that is, the high-temperature gas goes through the tube side, the water goes through the shell side, and the water takes away the high temperature The thermal energy of the gas is converted into steam of 0.4-0.8 MPa, and the steam is transported to the phosphorus melting tank 1 through the pipeline 7, or transported to the external production and living needs ...

Embodiment 3

[0025] P with a temperature of 200-450°C after heat exchange 2 o 5 The gas enters the absorption tower 10 through the pipeline 9, reacts with 30-42% potassium hydroxide alkali solution at a temperature of 50-98°C, adjusts the pH value to 8.8-9.2, and adds a precipitant to remove arsenic and heavy metals. Then pass through precipitation filtration, crystallization and drying to obtain the finished dipotassium hydrogen phosphate. Burning a ton of yellow phosphorus can produce 6.5-7.0 tons of water vapor with a pressure of 0.4-0.8 MPa, and obtain 5.052 tons of dipotassium hydrogen phosphate as a finished product, with a product conversion rate of 90%.

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Abstract

The invention discloses a method and device for producing phosphate through adopting yellow phosphorus one-step method. The technical proposal of the invention are that: solid yellow phosphorus is melted into liquid elemental phosphorus inside a phosphorus melting trough and then is pumped into a phosphorus furnace for oxidizing combustion to generate high-temperature phosphorus pentaoxide gas; then, the temperature of the high-temperature phosphorus pentaoxide gas is lowered after completing heat exchange inside an exhaust heat boiler and generate high-pressure water vapor at the same time; finally, low-temperature gas enters into an alkali absorbing tower to react with alkali solution to generate phosphate. The invention can fully reclaim the chemical heat energy generated from yellow phosphorus combustion and also reduces the three major steps adopted in phosphate production to two steps, thereby omitting the intermediate process during phosphoric acid production, saving raw materials and equipment investment, avoiding discharge of acid mist and reducing environmental pollution.

Description

technical field [0001] The invention relates to the technical field of phosphate production technology, in particular to the technical field of a process and a device for yellow phosphorus one-step production of phosphate. Background technique [0002] Phosphoric acid and phosphate are important components of the chemical industry in the national economy. At present, phosphate is produced by alkalization with phosphoric acid. The production process of phosphoric acid can be divided into two categories: wet process phosphoric acid and thermal process phosphoric acid. Because wet-process phosphoric acid has many impurities and is difficult to purify, domestic production of phosphate is still mainly based on thermal phosphoric acid. The process of producing phosphate based on thermal phosphoric acid includes three steps: burning yellow phosphorus to produce phosphorus pentoxide, hydrating and absorbing phosphorus pentoxide into high-concentration phosphoric acid, and neutraliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/20
Inventor 罗宗恬王志维
Owner 罗宗恬
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