The method of purification of gas emissions from industrial production from hydrocarbons


 

(57) Abstract:

The invention relates to a method for cleaning exhaust gases from hydrocarbons and may find application in the oil refining, petrochemical and other industries. Method of cleaning exhaust gases from hydrocarbons is carried out by air oxidation in the presence of the cement-containing catalyst of the following chemical composition, wt.%: manganese dioxide 20 to 40, the copper oxide 20 to 30, Nickel oxide 10 - 15, Tulum else. The method allows to increase the degree of purification of exhaust gases from hydrocarbons. table 1.

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 (N. M.Popov, the Catalysts for purification of gas emissions from industrial productions. - M.: Chemistry, 1991. - 175 S.).

Closest to the proposed method to the technical essence and achieved the key NTC-4 on the basis of base metals - Cu, Cr, Zn (Pletnev E. Century. and other Catalytic oxidation of organic compounds in gaseous emissions from industrial productions. // Mo. chem. technology. cleaning the air. environment. - Saratov, 1992. - S. 32 - 33).

The known method is implemented with the passage of gases containing hydrocarbons, through the catalyst bed at a temperature of 300oC, but in this case, the depth of oxidation does not exceed 95 - 97%.

The disadvantage of this method is the low degree of purification.

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

This goal 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 280 - 300oC in presence of cement-containing catalyst based on transition metals Mn, Cu, Ni and characterized by the following chemical composition, wt.%:

manganese dioxide - 20 - 40

the copper oxide - 20 - 30

Nickel oxide - 10 - 15

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 to 2 the air mixture (air and oxidizable component) with the concentration of hydrocarbon 400 - 8200 mg/m3passed through a static layer of Mn, Cu, Ni-cement-containing catalyst (5 cm3). At the reactor exit gases are analyzed by gas chromatography using a chromatographic column with 5% SE-30 on inerton.

The catalyst was tested in operation for 100 hours, its activity during this time remained constant.

Due to the presence in the catalyst of the cement component of the latter is characterized by very high strength (mech. the strength of 270 kg/cm2), which contributes to the increase of life in an industrial environment.

According to the proposed method, the degree of purification increases to 100% versus 95 - 97% at a known way; the process is not accompanied by the destruction and ablation of the catalyst due to the cement component (see table).

Method of cleaning exhaust gases from hydrocarbons by air oxidation at 280 - 300oC in the presence of a heterogeneous catalyst, wherein the process is conducted in the presence of the cement-containing catalyst of the following chemical composition, wt.%:

Manganese dioxide - 20 - 40

The copper oxide - 20 - 30

Nickel oxide - 10 - 15

Tulum -

 

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