METHOD OF SULFUR DIOXIDE OXIDATION Russian patent published in 2005 - IPC

FIELD: chemical industry; methods of production of sulfuric acid.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the method of oxidation of sulfur dioxide and may be used in oxidation of sulfur dioxide into trioxide in production of sulfuric acid both from elemental sulfur and sulfur-containing minerals (pyrite), and at purification of sulfur-containing industrial gases outbursts. The method of oxidation of sulfur dioxide provides for a gating through of the gaseous reaction mixture containing even sulfur dioxide and oxygen through a catalyst layer providing oxidation of sulfur dioxide into sulfur trioxide. At that use the catalyst representing a geometrically structured system made out of microfilaments of a 5-20 microns diameter and having the active centers, which are characterized in IR spectrums of adsorbed ammonia by availability of an absorption band with the wave numbers in the range of v = 1410-1440 cm^-1 containing an active component and a highly siliceous fibrous carrying agent defined characterized by availability in a spectrum of nuclear magnetic resonance (NMR)²⁹ Si lines with chemical shifts - 100±3 m.d. (line Q³) and - 110±3 m.d. (line Q⁴) at a ratio of the integrated intensities of the lines Q³/Q⁴ 0.7-1.2, in the IR spectrum of an absorption band of the hydroxyl groups with a wave number ν = 3620-3650 cm^-1 and a half-width of 65-75 cm^-1 having a specific surface measured by method BET by a thermal desorption of an argon, S_Ar = 0.5-30 m² / g, the value of the surface, measured by a method alkaline titrating S_Na= l0-250 m² / g at the ratio of S_Na/S_Ar = 5-30. An active component of the catalyst is one of the platinum group metals, mainly platinum. The invention allows to increase a conversion in one adiabatic layer of the catalyst up to 80-85 %, to increase a maximum permissible concentration of sulfur dioxide in the initial blend. At that a mechanical stability of a catalyst layer is also ensured making it possible to create different types of catalyst layers.

EFFECT: the invention ensures a significant increase of a conversion in one adiabatic layer of the catalyst, an increase of a maximum permissible concentration of sulfur dioxide in the initial blend and creation of different types of the catalyst layers.

4 cl, 2 ex