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Method for removing hydrogen fluoride gas in hydrogen chloride gas by using aluminum oxide

A hydrogen chloride gas, hydrogen fluoride gas technology, applied in the direction of chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., can solve problems such as difficult separation, and achieve the effects of simple reaction conditions, significant environmental and economic value, and good effects

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

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The preparation method of the activated alumina powder comprises: step 1, activation, baking the alumina at a high temperature of 300-400° C. for 1-5 hours in the air or under vacuum; Perform jet milling to obtain alumina powder with a particle diameter of 1-100 μm.

[0017] Alumina molecular sieves have a pore size of 3? or 4?, that is, a pore size of 3 angstroms or 4 angstroms, and 1 angstrom = 0.1nm. The alumina molecular sieve is prepared by a conventional method such as a hydrothermal synthesis method, and then activated, that is, the alumina molecular sieve is baked at a high temperature of 300-400° C. for 1-5 hours in air or under vacuum conditions.

[0018] Put the activated alumina powder or activated alumina molecular sieve into the reaction container, and then pass through the hydrogen chloride gas containing more than 1000ppm hydrogen fluoride gas to be treated, so that the hydrogen fluoride reacts with the alumina and is removed. The controlled reaction co...

Embodiment 1-10

[0020] Add 100g of activated alumina powder 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, and the reaction temperature ranges from -40°C to 200°C. The results obtained under different reaction conditions are shown in Table 1.

[0021] Table 1: Reaction conditions and obtained results of Examples 1-10.

[0022] serial number temperature (°C) Pressure (MPa) Concentration1 (ppm) Concentration 2 (ppm) The time for the concentration of hydrogen fluoride to drop to 10ppm 1 －40 0.1 345 101 20min 2 －40 5 123 57 18 minutes 3 0 0.1 238 56 15 minutes 4 25 0.5 37 13 13 minutes 5 50 0.5 26 9.8 10 minutes 6 50 5 25 8.7 9 minutes 7 100 1 17 7.2 7 minutes 8 100 5 8.5 5.3 50s 9 150 5 7.4 6.1 40s 10 200 5 7.3 5.1 40s

[0023] Concentratio...

Embodiment 11-20

[0025] Add 100g of activated alumina molecular sieves 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, and the reaction temperature ranges from -40°C to 200°C. The results obtained under different reaction conditions are shown in Table 2.

[0026] Table 2: Reaction conditions and obtained results of Examples 11-20.

[0027] serial number temperature (°C) Pressure (MPa) Concentration1 (ppm) Concentration 2 (ppm) The time for the concentration of hydrogen fluoride to drop to 10ppm 11 －40 0.1 147 76 20min 12 －40 5 89 37 18min 13 0 0.1 113 53 16min 14 25 0.5 36 9.7 10min 15 50 0.5 18 6.1 7min 16 50 5 17 4.7 6min 17 100 1 17 4.2 6min 18 100 5 8.1 5.1 50s 19 150 5 5.3 4.8 30s 20 200 5 5.4 4.2 30s

[0028] Concentration 1 is the c...

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Abstract

The invention discloses a method for removing a hydrogen fluoride gas in a hydrogen chloride gas by using aluminum oxide. The method comprises the step: making the hydrogen chloride gas containing the hydrogen fluoride gas pass through activated aluminum oxide powder or activated aluminum oxide molecular sieve to ensure that hydrogen fluoride reacts with aluminum oxide to be removed, wherein the reaction conditions are as follows: the temperature is -40 DEG C-200 DEG C, the reaction pressure is 0.1-5 MPa, and the reaction time is 30s-20min. A preparation method of the activated aluminum oxide powder comprises the steps: 1, activating, baking the aluminum oxide in air or vacuum condition at a temperature of 300-400 DEG C for 1-5 hours; and 2, performing airflow crushing on the activated aluminum oxide obtained in the step 1 to obtain aluminum oxide powder with a particle size of 1-100 mu m, wherein the pore diameter of the aluminum oxide molecular sieve is 3-4. The aluminum oxide molecular sieve is activated after being made. The method for removing the hydrogen fluoride gas in the hydrogen chloride gas by using the aluminum oxide, provided by the invention, provides a novel method for efficiently purifying hydrogen chloride, which has remarkable environment and economic values.

Description

technical field [0001] The invention relates to a method for removing hydrogen fluoride gas in hydrogen chloride gas, in particular to a method for removing hydrogen fluoride gas in hydrogen chloride gas by using aluminum oxide. 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 widely used medium and low temperature environmentally friendly refrigerant, due to its good comprehensive performance: [0004] (1) Does not destroy the ozone ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
Inventor 庄田谢坤黄健翔杨菲李杰
Owner SHANGHAI MASTECK ENVIRONMENTAL
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