SU1041139A1 - Method of cleaning waste gases from organic substances - Google Patents

Abstract

A METHOD FOR CLEANING EXHAUST GASES FROM ORGANIC SUBSTANCES by deep oxidation of them on a catalyst containing hydrogen metals, including blowing the catalyst with air, characterized in that, in order to increase the productivity of the process while maintaining the degree of purification by increasing the activity of the catalyst, an air mixture is used to blow it through s. oxytrichlorid vanadium.

Description

Do

The invention relates to methods for purifying waste gases from toxic organic substances and can be used for neutralizing air emissions from chemical, eftech and coke production, as well as automotive exhaust gases. The known method of purification of waste air pii of harmful impurities in the process of obtaining high-temperature pitch by their catalytic oxidation at elevated temperatures, where bauxite or iron py-f DUM- is used as catalyst. ADVANTAGE: This method is the availability and low cost of the catalyst. However, due to the low activity and stability in the operation of such catalysts, it is necessary to create units of large size and to make frequent replacement of the waste catalyst, which is economically unprofitable. .. The closest to the technical essence and the achieved result is the method of purification of flue gases from organic substances by oxidizing them on a platinum-containing catalyst with subsequent oxidation of the alumoplatinum catalyst, at this gas, emissions containing formaldehyde, phenol , benzene and resinous, substances representing a mixture of polyaromatic carbonic hydrogen, are first oxidized on a platinum catalyst with a metal carrier at 250-300 ° C, and the additional oxidation is carried out on an aluminum plating catalyst. recuperators at .400-500 ° C. The degree of purification of waste gases from organic substances is 9–8–10b% at a space velocity of 13,000 h 2j. The disadvantage of this method is that when the flow rate increases to 30,000 h, the purification rate is 85–87%. This is due to the fact that, at a large volumetric rate, toxic substances slip through due to insufficiently high active catalyst. . The purpose of the invention is to increase the productivity of the wound purification process by increasing the activity of the catalyst. The fixed goal is achieved by the method of purifying waste gases from organic substances, which involves deep oxidation of them on the catalyst containing noble metals, and in blowing the catalyst air, to purge it, use a mixture of air with vanadium oxytrichloride. When vanadium oxytrichloride is fed into the stream of hot BO3Jqiyxa, it evaporates, interacts with the catalyst, it decomposes into vanadium pentoxide j, which remains on the catalyst, and chlorine, which is carried away by air flow. V o that settles on the catalyst distributes with across the catalyst bed unevenly, there is more in the front layer, and it is absent at the end of the layer. An increase in activity is observed for both aluminum and platinum catalysts, as well as catalysts on precious metals deposited on a metal carrier. The process technology is to purge the digester with air at; 300400 s to remove organic matter. compounds in the course of hours, feeding le hot air rxitrichloride vacuum at a concentration of 20–100 g / m in the air (at high concentrations, unreacted VOClg may occur), blowing the catalyst with air for removing chlorine residues at 30t) for h and directly: neutralization; emissions that contain polyaromatics, by catalytic oxidation to palladium or platinum-supporting catalysis of aTopei, activated. vanadium oxytrichloride. Example. Cleaning Exhaust air from cubes-reactors of pekrkoksovogo production, containing polyaromatic hydrocarbons, g / m: yndan0, bz inden 0.06; naphthalene 3.68; methylnaphthalene 0.55; quinoline 0.06; diphenyl O, 08; dimethylnaphthalene 0.07; - acetaften 0.47; indole 0.07; fluorene 0.11; anthracene phenanthrene 0.25 and other polyaromatic hydrocarbons with a total content of 6, 5 g / m. Oxidation of Hydrocarbons is carried out on an AP-56 catalysts, which are alumina pellets containing 0.56% platinum. The temperature of the reactor, the volumetric rate of gas to be neutralized is 13,000 hours. The degree of purification from organic matter is 98%. At a space velocity of 30,000 hours, the purification rate decreases to 88%. The catcher is purged with air containing 20 g / m of vanadium oxytrichloride. Purge time 2 min. The total amount of vanadium oxytrichloride is 0.08% by weight of the catalyst, and after purging the catalyst, the treated air of the pitch coke reactor is cleaned at. 400 C and a flow rate of 30,000 h. The degree of purification from organic matter is 98%. PRI and ME 2, Purified exhaust air from cubic-coke-type reactors is cleaned. the production of aromatic hydrocarbons (Example 1), the oxidation of hydrocarbons is carried out on the catalyst B 17D, which represents. a nichrome spiral with deposited on it fell with the promoter and additives. The temperature of the reactor is 400j.C, the volume is fast. At 13,000 hours, the purification rate is 97%. With a volumetric rate of 30,000 cTeijeHb, the purification from pp of ana- lytic substances is 87%. Run time 1 min. The total amount of oxitrichloride. Vanadium is 0.03% by weight of the catalyst. After the catalyst has been purged, the treated air is cleaned at the pekokoksovoy cube-reactor production at a flow rate of 30,000 pp. The degree of purification from organic matter is 96%. :,. The table shows the data on the degree of purification; using catalysts treated with VOClj at 400 s and a space velocity of setting gases to be purified 3000 h

QUANTITY STVO VOClj

Catalyst

ha 1 and alizator,%

NIIOGAZ-17D, Pd on the yikhrbmovy spiral NIIOGAZ-17D, 0.03% Pd

    %

/ on - nichrome spirals

  kC ..

AP-5 & 0.56% Pt per

Degree of cleaning,%

87 92

96

94

85

Claims (1)

METHOD FOR CLEANING WASTE GASES FROM ORGANIC MATTERS by deep oxidation of them on a catalyst containing noble metals, including blowing the catalyst with an arc, characterized in that, in order to increase the productivity of the process while maintaining the degree of purification by increasing the activity of the catalyst, an air mixture is used to purge it with vanadium oxytrichloride.