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Method for continuous production of liquid calcium chloride by using fluorine-containing by-product waste hydrochloric acid

A technology of waste hydrochloric acid and calcium chloride, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problems such as the technical enlightenment of producing liquid calcium chloride from waste hydrochloric acid containing fluorine, etc. Achieve the effect of meeting the requirements of large-scale processing, convenient operation, and not harsh process elements

Active Publication Date: 2015-12-09
常熟市三福化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the patent and non-patent literature so far, there is no technical revelation about utilizing fluorine-containing waste hydrochloric acid to produce liquid calcium chloride

Method used

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  • Method for continuous production of liquid calcium chloride by using fluorine-containing by-product waste hydrochloric acid

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Effect test

Embodiment 1

[0019] The fluorine-containing by-product waste hydrochloric acid with a content of 800ppm in the process of producing fluorine chemical products such as difluorochloromethane (R22) produced by a fluorine chemical enterprise and a fluorine-containing by-product waste hydrochloric acid with a HCl mass % of hydrochloric acid of a concentration of 30% is used as a raw material. The reaction vessel (reaction kettle) with a stirring device reacts continuously with limestone and limestone with a particle size of 15m to 125mm. The specific working conditions are: the above-mentioned limestone is excessive at the beginning, and then the by-product hydrochloric acid is added continuously In the operating mode of the working condition, the pH value of the reaction completion liquid produced in the continuous reaction process is controlled to be pH1.5 and the reaction liquid is introduced (overflowed) into the liquid storage tank (neutralization stirring tank) in an overflow mode, and is c...

Embodiment 2

[0022] The fluorine-containing by-product waste hydrochloric acid with a content of 2000ppm of fluorine ion produced in the process of producing fluorine chemical products such as tetrafluoromonomer by a fluorine chemical enterprise and a HCl mass% of hydrochloric acid with a concentration of 12% is used as a raw material in a stirring device for reaction React continuously with limestone that tends to be powdery and has a particle size of 40μm to 2mm in the container (reactor). In the operating mode of the continuous reaction process, the pH value of the reaction completion liquid produced in the continuous reaction process is controlled to be pH3.5 and the reaction liquid is introduced into (neutralizing the stirring tank) liquid storage tank in an overflow mode, and is continuously injected into the liquid storage tank at the same time. Adding mass % specific concentration is 25% milk of lime to adjust the pH value of the reaction solution in the liquid storage tank to pH=8,...

Embodiment 3

[0024] The fluorine-containing by-product waste hydrochloric acid with a content of 20000ppm in the process of producing fluorine chemical products such as R32 (difluoromethane) produced by fluorine chemical enterprises and a HCl mass % of hydrochloric acid with a concentration of 26% is used as a raw material in a stirring tank. In the reaction vessel (reactor) of the device, there is a continuous reaction with limestone that tends to be small in shape and has a particle size of 0.5-2mm. In the working condition of adding limestone, the pH value of the reaction completion liquid produced in the continuous reaction process is controlled to be pH2.5 and the reaction liquid is introduced into (neutralizing the stirring tank) liquid storage tank in an overflow mode, and is continuously supplied to the storage tank in a continuous manner. Add lime milk with a mass % specific concentration of 55% in the liquid tank to adjust the pH value of the reaction liquid in the liquid storage ...

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Abstract

The invention discloses a method for continuous production of liquid calcium chloride by using a fluorine-containing by-product waste hydrochloric acid, and belongs to the technical field of environmental protection and resource utilization. The fluorine-containing by-product waste hydrochloric acid as a raw material is subjected to a continuous reaction with limestone in a reaction container with or without a stirring device, then a reaction completion liquid produced in the process of continuous reaction is introduced into a liquid storage tank in an overflow way, a pH value regulator is added into the liquid storage tank in a continuous way to regulate the pH value of the reaction liquid to pH=8-14, and the liquid calcium chloride is obtained by clarifying, filter pressing and filtration. Because the technology process is concise, the technology factors are not strict, and the method can be convenient to operate; because the adopted raw material is the fluorine-containing by-product waste hydrochloric acid, the method not only can convert waste into wealth, but also can protect the environment, so as to reflect maximization utilization of resources; and due to continuous production of liquid calcium chloride, the production efficiency is high, and mass processing requirements on the fluorine-containing by-product waste hydrochloric acid are met.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and in particular relates to a method for continuously producing liquid calcium chloride by utilizing fluorine-containing by-product waste hydrochloric acid. Background technique [0002] In the process of producing fluorine-containing chemical products in fluorine chemical enterprises, a large amount of fluorine-containing waste hydrochloric acid will be produced, and the fluoride ion (F - ) amount from 3ppm to 3×10 4 ppm varies. If the fluorine-containing by-product waste hydrochloric acid is directly sold or discharged without any treatment, it will undoubtedly cause catastrophic damage to the environment, which is expressly prohibited in my country; and if the fluorine-containing by-product waste hydrochloric acid is harmlessly treated Therefore, it is difficult for fluorine chemical product manufacturers to bear due to high facility investment costs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/28
Inventor 岳中周苏志浩王建清马泽宏
Owner 常熟市三福化工有限公司
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