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Alkali washing process of hydrofluochloric hydrocarbon and its 'buffering' alkali washing liquid

A technology of hydrofluorochlorocarbon base and hydrochlorofluorocarbon, which is applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of high consumption of raw materials, serious environmental pollution, and high fluorine content in waste lye, To achieve the effect of reducing consumption and saving energy

Inactive Publication Date: 2004-07-07
ZHEJIANG QUHUA FLUOR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the alkali cleaning of the production process of hydrochlorofluorocarbons, due to a certain concentration of alkali, the phenomenon of hydrolysis of hydrochlorofluorocarbons, especially R 22 , R 134a It is easy to hydrolyze in lye, and the greater the concentration of lye, the R 22 The more serious the hydrolysis phenomenon, the higher the consumption of raw materials (including the consumption of reactants and the consumption of alkali), the higher the fluorine content in the waste lye, and the more serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 50 grams of F22, F141b, R134a, and R125a were respectively passed into 50 grams of sodium hydroxide solutions of two different concentrations prepared for testing. The experimental results are as follows:

[0015] lye name

lye concentration

F141b

F22

F134a

F125

NaOH

2.5％

518

520

523

528

NaOH

3.0％

521

524

528

529

[0016] Note: The experimental value of F141b is the measured value after heating to 60°C for ten minutes after lye absorption, and then cooling to 20°C.

[0017] It can be seen from the experimental results that the solubility of hydrochlorofluorocarbons in lye is not only related to the concentration of lye, but also related to the amount of element F in hydrofluorocarbons. The higher the concentration of lye, the heavier the solution in the open bottle, that is, the more residual HCFCs in the open bottle, indicating that the hydrolysis of HCFCs in the lye is m...

Embodiment 2

[0019] 50 grams of F22, F141b, R134a, and R125a were passed into 50 grams of special solutions K1, K2, and K3 prepared in a certain proportion with different pH values ​​for testing. The experimental results are as follows:

[0020] lye name

[0021] From the experimental data, it can be seen that in solutions of different pH values, the solubility of hydrochlorofluorocarbons is also different, and the pH value of the solution is larger, and the dissolution rate is larger; similarly, the more F elements in hydrofluorochlorocarbons, The amount dissolved in the solution is also greater.

Embodiment 3

[0023] We have tested the lye of the F22 unit. Under the same conditions, 5% NaOH solution is used for control. The consumption of the unit is: AHF is 0.54 tons / ton F22, CHCL 3 It is 1.54 tons / ton of F22; the alkali washing liquid is changed to K2, and the pH value is controlled at 9.5-13 at the same time, and the consumption of AHF is 0.48 tons / ton of F22, CHCL 3 It is 1.46 tons per ton of F22, and effectively removes traces of acidic impurities such as hydrogen fluoride, hydrogen chloride, chlorine and phosgene. After alkali washing, the F22 product reaches: purity ≥ 99.8%, acidity ≤ 0.0001%, moisture ≤ 0.001%, reaching the index of superior products.

[0024] As can be seen from the device test results, select novel solution K2 (i.e. novel solution proportioning of the present invention) than select common NaOH lye as alkali washing liquid, produce F22 The raw material consumed of product is more economical, energy consumption is low.

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Abstract

An alkali washing process for hydrogen-contained fluochloric hydrocarbon includes such steps as mixing it with "buffering" alkal-washing solution in mixing pump, liquid-liquid alkali washing in tower or container, laying aside for layering, and separating out waste alkali solution. Said "buffering" alkali-washing liquid is prepared from stong-alkaline-salt and weak-alkaline salt in ratio of 0.7-1.7. Its advantages include effective separation of both phases, low consumption of raw materials and less environmental pollution.

Description

technical field [0001] The invention relates to a hydrofluorochlorocarbon alkali washing method. Background technique [0002] In the production process of hydrochlorofluorocarbons, the crude product contains a certain amount of acidic substances. To make the product meet a certain acidity requirement, it must go through the process of alkaline washing of the crude product. [0003] At present, in the domestic industrial production of hydrochlorofluorocarbons, the alkaline cleaning method adopts absorption alkaline cleaning. The absorption alkali washing method usually uses ordinary alkali, such as a certain concentration of NaOH solution, to carry out sufficient gas-liquid mass transfer, reaction and dissolution with the crude product of hydrochlorofluorocarbons in the absorption tower in a parallel or countercurrent manner, and use the various components of the crude product in the absorption tower. Different components in the gas are separated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/38C07C19/10
Inventor 汤月明陈科峰
Owner ZHEJIANG QUHUA FLUOR CHEM