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Trichloroethylene waste gas catalytic purification method

A technology of trichlorethylene and catalytic purification, applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve problems such as secondary pollution, achieve the effect of no reduction in activity and great environmental protection application prospects

Inactive Publication Date: 2006-07-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An obvious shortcoming of the chlorinated hydrocarbon elimination method proposed above is that polychlorinated hydrocarbons are produced in the process, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 3.0g of cetyltrimethylammonium bromide (CTMAB) and add 105ml of deionized water to dissolve at 30°C to produce a transparent template solution; then add 35ml of ethylenediamine (EDA) under stirring Put it into the flask together with the template solution and keep it at 30°C; then slowly drop the mixed solution of 15ml tetraethyl orthosilicate (TEOS) and 50ml deionized water into the above-mentioned system containing template agent, ethylenediamine and water, So that the amount of each substance in the system satisfies: n(TEOS):n(CTMAB):n(EDA):n(H 2 (0)=1: 0.12: 9.7: 130, stirred for 15min, the pH of the acetic acid regulator system was 10.5, after continuing to stir for 1.5h, the sol mixture was transferred into a 100ml stainless steel reactor with a polytetrafluoroethylene liner, at 120 It was statically crystallized in an oven at ℃ for 72 hours under its own pressure, taken out and cooled, washed with deionized water, filtered with suction, washed with absolute ...

Embodiment 2

[0028] Concentration is 0.00319M chloroplatinic acid aqueous solution 1ml and concentration is that 0.01275M palladium chloride aqueous solution 1ml is mixed, and the MCM-41 / PO of the various phosphoric acid content that prepares in embodiment 1 is impregnated with 2mL mixed solution respectively 3 On the H carrier, the follow-up treatment is carried out according to the method of Example 1 to obtain 0.08wt%Pt-0.5wt%Pd / MCM-41 / PO 3 H series catalysts. Take by weighing 100mg of the catalyst, the reaction temperature is 500°C, the moisture content in the humid air is 0.2vol%, the concentration of trichlorethylene is 0.1vol%, and the molar ratio of water to trichlorethylene is 2:1; The amount of waste gas treated per hour is 30L, and the reaction pressure is 0.1Mpa. All the other reaction conditions are the same as in Example 1, the conversion rate of trichlorethylene is shown in Table 2, and the reaction products are carbon dioxide, hydrogen chloride and a trace amount of chlori...

Embodiment 3

[0031] Commercially available SiO 2 Surface area is 303m 2 / g, by impregnating phosphoric acid in Example 1, SiO with various phosphoric acid contents 2 / PO 3 H carrier. Use 2ml concentration respectively to be 0.00319M chloroplatinic acid aqueous solution, impregnate on various supports, follow-up treatment is carried out by the method for embodiment 1, obtains 0.08wt%Pt / SiO 2 / PO 3 H catalyst. Weigh 200mg of each catalyst of this series, the reaction temperature is 450°C, the reaction pressure is 0.5Mpa, the moisture content in humid air is 0.15vpl%, the concentration of trichlorethylene is 0.05vol%, the amount of waste gas treated per gram of catalyst per hour For 15L, all the other reaction conditions are the same as in Example 1, the conversion rate of trichlorethylene is shown in Table 3, and the reaction products are carbon dioxide, hydrogen chloride and a trace amount of chlorine.

[0032] Si / P(atom)

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PUM

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Abstract

The invention discloses the catalytic cleaning method of trichloroethylene. The method comprises the following steps: insufflating the humid air into waste gas containing trichloroethylene to carry out reaction at the existence of catalyst which is composed by carrier, rare metal, rare earth oxide and phosphorus acid; at humid air and low temperature, the trichloroethylene changed to carbon dioxide and hydrochloride, and the catalyst keeping active. The precious metal content in catalyst is few, and there is not polychlorocarbon byproduct, so the method is effective and environmental conservation.

Description

technical field [0001] The invention relates to a treatment method for waste gas containing trichlorethylene, in particular to a catalytic combustion method, and more particularly to a catalyst used. Background technique [0002] The harm of chlorine-containing organic compounds is not only to human health, but also to cause lasting and cumulative effects on biological systems, and to destroy atmospheric ozone. The 12 persistent organic pollutants ranked first in the international treaty of the United Nations Environment Program are all chlorine-containing organic compounds [2] . Chlorinated hydrocarbons (CHC) are divided into aromatic hydrocarbon chlorides, such as chlorobenzene, dichlorobenzene, and non-aromatic hydrocarbon chlorides, such as vinyl chloride, polychlorethylene, methyl chloride and polychloromethane. The former is produced from chlorine-based Whitening of wood pulp for oxidants, heat treatment of chlorine-containing compounds and recovery of metals; the la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/70B01D53/86B01J27/16
CPCB01D53/8662B01J37/28B01J29/0325B01J29/0308B01D2255/206B01D2255/102B01J2229/20B01J2229/37
Inventor 王幸宜李到郑翊戴启广
Owner EAST CHINA UNIV OF SCI & TECH
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