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Dechlorination method and device

A technology of hydrogen chloride gas and fluorosilicic acid, which is applied in the direction of silicon halide compounds, hydrogen fluoride, fluorine/hydrogen fluoride, etc., can solve the problems affecting the output of anhydrous hydrogen fluoride, reduce chloride, waste, etc., and achieve the reduction of environmental protection pressure and the improvement of reaction efficiency. The effect of avoiding waste

Inactive Publication Date: 2018-12-07
钱圣奎
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the production process, it was found that chlorides in fluorosilicic acid would interfere with the production of anhydrous hydrogen fluoride, especially in the process of concentrating fluorosilicic acid and the subsequent process of using high-concentration fluorosilicic acid to react with sulfuric acid to prepare hydrogen fluoride. Part of fluorosilicic acid has to be abandoned due to too high chlorine content, resulting in waste and affecting the output of anhydrous hydrogen fluoride; therefore, it is very necessary to reduce the chloride content in raw material fluorosilicic acid

Method used

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Embodiment 1

[0027] The raw material fluosilicic acid was taken, and its composition was analyzed. It contained the following ingredients: 18wt% fluosilicic acid, 1.5wt% chloride ion, 20mg / L iodine, 10mg / L arsenic, 0.1% phosphorus pentoxide, and the rest was water.

[0028] Such as Figure 1-2 As shown, the raw material fluosilicic acid is added to the heat exchanger, and the superheated steam is heat-exchanged and vaporized. The amount of silicic acid added is 20m 3 / h, the vaporized gas is passed into the condenser, and is cooled by heat exchange with chilled water. Fluosilicic acid is first condensed into liquid, and the temperature of the collected liquid fluosilicic acid is 30°C, and the rest of the gas is passed through the packed tower. Wash with acidic circulating water, and finally the remaining tail gas is discharged. The acidic circulating water comes from the phosphoric acid workshop, circulates in the packed tower, and returns to the phosphoric acid workshop for reuse after ...

Embodiment 2

[0031] The liquid fluosilicic acid that obtains in embodiment 1 is carried out dechlorination operation again, and concrete steps are the same as

[0032] Example 1, the composition of the finally obtained liquid fluosilicic acid is as follows: 18.8wt% fluosilicic acid, 0.1wt% chloride ion, 4mg / L iodine, 3mg / L arsenic, 0.08% phosphorus pentoxide, and the rest is water.

Embodiment 3

[0034] The raw material fluosilicic acid was taken, and its composition was analyzed. It contained the following ingredients: 24wt% fluosilicic acid, 2.5wt% chloride ion, 25mg / L iodine, 12mg / L arsenic, 0.2% phosphorus pentoxide, and the rest was water.

[0035] Such as Figure 1-2 As shown, the raw material fluosilicic acid is added to the heat exchanger, and the superheated steam is heat-exchanged and vaporized. The amount of silicic acid added is 15m 3 / h, the vaporized gas is passed into the condenser, and is cooled by heat exchange with chilled water. The fluosilicic acid is first condensed into a liquid, and the temperature of the collected liquid fluosilicic acid is 25-35°C, and the rest of the gas passes through the packed tower The middle pair is washed with acidic circulating water, and finally the remaining tail gas is discharged. The acidic circulating water comes from the phosphoric acid workshop, circulates in the packed tower, and returns to the phosphoric acid...

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Abstract

The invention discloses a dechlorination method and device. According to the dechlorination method, the raw material fluosilicic acid is heated and evaporated into gas, and then the gas is cooled, andthe fluosilicic acid gas is firstly cooled into a liquid fluosilicic acid, so that fluosilicic acid is separated from the hydrogen chloride gas. Fluosilicic acid and hydrogen chloride are heated andevaporated into gas, and then due to the boiling point difference between fluosilicic acid and hydrogen chloride gas, the fluosilicic acid is firstly liquefied into the liquid fluosilicic acid and thehydrogen chloride still exists in the form of gas; finally, the acidic circulating water provided by a phosphoric acid workshop in the zone is utilized to absorb the hydrogen chloride gas and the acidic circulating water after absorbing the hydrogen chloride gas is returned to the phosphoric acid workshop for recycling. The concentration of chloride in fluosilicic acid can be effectively reduced,so that the situation of having to abandon caused by high concentration of chloride in fluosilicic acid can be completely avoided. The consumption of fluosilicic acid raw material is 10% lower than that of the prior art during the production process of anhydrous hydrogen fluoride.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to the purification of fluosilicic acid, a by-product of wet-process phosphoric acid, in particular to a chlorine removal method and device. Background technique [0002] The rapid development of the phosphate fertilizer industry has realized the optimal allocation of resources and increased the concentration of the industry, but the establishment of the wet-process phosphoric acid process in batches has produced a large amount of fluosilicic acid by-product. The conventional way to recover fluorosilicic acid is to generate fluorosilicate or fluoride salt. Although the process is simple, the added value of the product is low, and the market's digestibility of the product is obviously not enough, and the utilization efficiency is low. [0003] Our company successfully uses fluosilicic acid as a raw material to produce anhydrous hydrogen fluoride. The process is as follows: the dilute f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/10C01B7/19
CPCC01B33/103C01B7/193
Inventor 钱圣奎
Owner 钱圣奎
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