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Method for purifying hydrogen chloride by adopting anhydrous calcium chloride

An anhydrous calcium chloride, hydrogen chloride technology, applied in chlorine/hydrogen chloride, chloride preparation and other directions, can solve problems such as difficult separation, achieve the effect of recovery and reuse, significant environmental and economic value

Inactive Publication Date: 2014-07-02
SHANGHAI MASTECK ENVIRONMENTAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the same form of hydrogen fluoride and hydrogen chloride, it is difficult to separate them by common methods

Method used

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  • Method for purifying hydrogen chloride by adopting anhydrous calcium chloride

Examples

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Comparison scheme
Effect test

Embodiment 1-10

[0026] Example Add 100g of activated anhydrous calcium chloride into a 500mL pressure reactor, then pass hydrogen chloride gas with a hydrogen fluoride concentration of 1000ppm into the reactor, and control the pressure of the reactor at 0.1 to 5MPa, reflecting the temperature -40°C to 200 Within the range of ℃, the reaction time is 5min-18h, as shown in Table 1:

[0027] Table 1: Reaction conditions and results of Examples 1-10

[0028]

[0029] Among them, the superscript 1 of the concentration indicates the concentration of HF reacted for 1 min; the superscript 2 of the concentration indicates the concentration of HF reacted for 10 min.

[0030] As described in the above examples and Table 1, it can be seen that under the process conditions of reactor pressure of 0.1MPa~5Mpa, reaction temperature of -40°C~200°C, and reaction time of 6 minutes to 18 hours, the concentration of HF can be reduced to About 1000ppm of hydrogen chloride is purified to a concentration of HF as...

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Abstract

The invention discloses a method for purifying hydrogen chloride by adopting anhydrous calcium chloride. According to the method, by adopting the anhydrous calcium chloride as an HF adsorbing agent, a hydrogen chloride gas to be treated is purified by using the following chemical reaction: (2HF+CaCl2->CaF2+2HCl), wherein the anhydrous calcium chloride is activated, the reaction temperature is -40-50 DEG C, the reaction pressure is 0.1-5MPa, and the reaction time is 6min -18 hours. According to the method, the hydrogen chloride gas is purified through a chemical reaction of the anhydrous calcium chloride and a hydrogen fluoride gas, the concentration of the hydrogen fluoride gas is reduced to be less than 10 ppm, and thus recovering and recycling of high-purity hydrogen chloride are realized; and the method is especially suitable for recycling the hydrogen chloride as a byproduct generated in a process of producing fluorides such as tetrafluoroethane, and is remarkable in environment and economic values.

Description

technical field [0001] The present invention relates to a process for purifying hydrogen chloride, in particular to a method for using anhydrous calcium chloride to remove hydrogen fluoride gas from hydrogen chloride gas, and finally realizes that the concentration of hydrogen fluoride gas is less than 10 ppm, thereby realizing the recovery and reuse of high-purity hydrogen chloride . Background technique [0002] R 134a is an HFC refrigerant that replaces R-12 (difluorodichloromethane), and its chemical composition is tetrafluoroethane. R 134a can be applied to new medium and high temperature stationary commercial refrigeration systems, such as water chillers and household refrigeration appliances. In addition, it can also be used to replace the existing R-12 refrigeration system and air conditioning system. It is also the global standard for new mobile air conditioners and can be used to replace existing R-12 mobile air conditioner systems. [0003] R-134a is the most w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/03
Inventor 庄田谢坤黄健翔杨菲李杰
Owner SHANGHAI MASTECK ENVIRONMENTAL
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