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Hydrodechlorination method of trichloro ethylene

A technology of trichlorethylene and hydrodechlorination, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of high price and scarce resources, and achieve low cost, technical feasibility, The effect of good economic and environmental benefits

Inactive Publication Date: 2014-04-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for trichlorethylene hydrogenation dechlorination, using transition metal phosphides as catalysts to solve the problem of using noble metals as trichlorethylene hydrogenation dechlorination catalysts in the prior art, with scarce resources and high prices and other shortcomings

Method used

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  • Hydrodechlorination method of trichloro ethylene

Examples

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Embodiment 1

[0024] The MoP catalyst was prepared by a temperature-programmed reduction method, and trichlorethylene was hydrodechlorinated by an in-line reaction. The specific method is: according to the atomic ratio of MoP (molybdenum: phosphorus = 1:1), weigh 4.00 g of ammonium molybdate and 3.00 g of diammonium hydrogen phosphate, mix and dissolve in 30 ml of distilled water until the solution is clear, and obtain a molybdenum phosphorus aqueous solution. The solution was evaporated to dryness in a water bath to obtain a molybdenum-phosphorus white mixture powder, which was dried overnight at 120° C. and calcined at 500° C. for 5 hours to obtain a blue precursor. The precursor is ground, pressed into tablets and sieved to obtain 20-40 mesh particles. Take 1ml of the particle and fill it in the middle of the quartz tube, 2 Under the atmosphere, the particles were raised to 300°C in 0.5h, and then at 1°C min -1 The rate was increased to 650°C and kept at this temperature for 2h. Then ...

Embodiment 2

[0026] The difference between this embodiment and Example 1 is that the hydrodechlorination reaction time is 3h, and the H 2 Passing time is identical with reaction time, and others are identical with embodiment 1. The HCl generated by the reaction was collected, and the conversion rate of trichlorethylene was calculated to be 27.17%.

[0027] It can be seen that the conversion rate of trichlorethylene is obviously improved by prolonging the reaction time.

Embodiment 3

[0029] The difference between this example and Example 1 is that the hydrodechlorination reaction temperature is 300° C., and the others are the same as Example 1. The HCl generated by the reaction was collected, and the conversion rate of trichlorethylene was calculated to be 12.15%.

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Abstract

The invention discloses a hydrodechlorination method of trichloro ethylene. By taking transitional metal phosphide as a catalyst, the method comprises the following steps: preparing the transitional metal phosphide by using a temperature-programmed reduction method; by taking the transitional metal phosphide as the catalyst, filling the middle part of a quartz tube reactor; bringing trichloro ethylene by means of H2 to a catalyst bed of the quartz tube reactor for hydrodechlorination reaction through a bubbling method, wherein the reaction air speed based on volume of H2 is 600-48000 / h, the temperature is 300-650 DEG C and the reaction time is 0.5-10h; and collecting HCl generated by reaction, and calculating the conversion ratio of trichloro ethylene. By taking the transitional metal phosphide as the catalyst, the method provided by the invention is technically feasible, free from pollution, low in cost and remarkable in effect of degrading trichloro ethylene, and has good economical and environmental benefits.

Description

technical field [0001] The invention relates to the field of hydrodechlorination, in particular to a method for hydrodechlorination of trichlorethylene. Background technique [0002] Trichloroethylene (TCE for short) is a colorless, volatile, insoluble in water, liquid with aromatic odor, and is a carcinogenic substance. As an organic chloride widely used in industry, it is mainly used as an extractant for fats, oils, spices and paraffin, an excellent solvent for various natural rubbers, synthetic rubbers, dyes, plastics, asphalt, and can also be used for refining petroleum and alcohol dehydration , organic synthesis, printing ink, viscose manufacturing, cosmetics manufacturing, refrigerator refrigerant and clothes dry cleaning agent, etc. Because of its volatility, contact with the skin can cause a generalized rash, and long-term exposure can cause damage to liver function. After high concentration inhalation, it will seriously inhibit the central nervous system of the hu...

Claims

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Application Information

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IPC IPC(8): A62D3/34B01J27/19B01J27/188B01J27/185A62D101/22
Inventor 任丽丽郭庆会
Owner SOUTHEAST UNIV
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