Method of cleaning industrial gas emissions from hydrocarbons

FIELD: cleaning waste gases from hydrocarbons; oil refining industry, petrochemical industry and other industries.

SUBSTANCE: proposed method includes oxidation with atmospheric oxygen at elevated temperature in presence of catalyst performed at temperature of 270-280°C in presence of cement-containing catalyst at the following composition of components, mass-%: copper oxide (CuO), 30-50; zinc oxide (ZnO), 19-30; manganese oxide (Mn3O4), 0.5-16; the remainder being technical calcium aluminate.

EFFECT: high degree of cleaning waste gases from hydrocarbons.

1 tbl

 

The invention relates to a method for cleaning exhaust gases from hydrocarbons and may find application in the oil refining, petrochemical and other industries.

Known methods for deep oxidation of hydrocarbons with oxygen using a variety of catalysts prepared on the basis of the expensive precious metals Pt and Pd, and cheaper transition metals valence (I.E. Popov, the Catalysts for purification of gas emissions from industrial productions. - M.: Chemistry, 1991, 175 S.; Pletnev EV and other Catalytic oxidation of organic compounds in gaseous emissions from industrial productions. APAR. chem. technology. cleaning the airbag. environment. - Saratov, 1992, p.32-33).

Closest to the proposed method to the technical essence and the achieved result is a method of deep oxidation of hydrocarbons in the presence of the cement-containing catalyst based on oxides of transition metals si, Mn, Ni (U.S. Pat. No. 2163836, Russia from 19.04.1999).

The known method is implemented by the oxidation of hydrocarbons with oxygen of air at 280-300°C in presence of cement-containing catalyst based on oxides of transition metals si, Mn, Ni, with full oxidation (100% conversion) is achieved when the concentration of hydrocarbons ˜ 5000-8000 mg/m3and flow rate up to 4·103h-1; Velicina hydrocarbon concentration to 6000-8500 mg/m 3and the speed of flow of cleaned gases to 4.3·103h-1at lower process temperatures up to 270-280°To reduce the degree of conversion of the hydrocarbons to 97-98,5%.

The technical result of the present invention is to increase the degree of purification of exhaust gases from hydrocarbons.

This technical result is achieved by the proposed method for purification of exhaust gases from hydrocarbons, which consists in the oxidation of the latter with oxygen at a temperature of 270-280°C in presence of cement-containing catalyst, which is characterized by the following chemical composition, wt.%:

the copper oxide (CuO)30-50
zinc oxide (ZnO)19-30
manganese oxide (PM3O4)0,5-16
talum (high alumina technical cement THE 6-03-339-79)rest

The method is as follows.

Charged to the reactor the catalyst is heated it in a stream of air up to 250°C, after which air serves a mixture of hydrocarbons.

Example:

Model steam-air mixture (air and oxidizable component) with the concentration of hydrocarbons 840-8600 mg/m3passed through a static layer of si, Zn, Mn - cement catalyst (5 cm3 ). At the reactor exit gases are analyzed by gas chromatography using a chromatographic column with 5% SE-30 on inerton. Experience time is 120 hours.

Studies have shown that in a long time, the activity of the catalyst is not changed.

Table
№ p/pOxidizable hydrocarbonThe concentration of hydrocarbons in the vapor mixture, mg/m3The temperature oxidation; °The speed of the steam-air mixture, h-1The degree of conversion of the hydrocarbon. %
1Toluene61002804,3·103100
2Isopropyl-benzene86002804,3·103100
3Styrene84039022·103100

According to the proposed method, the degree of purification increases to 100% against 97-98,5 at a known method.

In addition, the proposed method is much cheaper catalyst than in the known (the first 1.5 times less than the cost of a second).

The way the eyes of the TCI exhaust gases from hydrocarbons by oxidation with air oxygen at elevated temperature in the presence of a catalyst, characterized in that the oxidation is carried out at a temperature of 270-280°C in presence of cement-containing catalyst, which is characterized by the following chemical composition, wt.%:

the copper oxide (CuO)30-50
zinc oxide (ZnO)19-30
manganese oxide (Mn3O4)0,5-16
Tulumrest



 

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