V 2 corresponding
to them, at which the values of
c out are the same, we have:
V 2 / V 1 \ u003d ln ( c 1in / c out ) / ln ( c 2in / c out ) With an allowable content of organic sulfur after the hydrogenation stage of 1 mg / m
3
, a
nominal value
c 1in = 80 mg / nm
3
, the actual maximum one-time content (JSC Metafrax, Gubakha,
Perm region, see section 3)
c 2in = 11.1 mg / m
3
,
V 1 = 1650 h
-1
(nominal load of the hydrogenation
apparatus), we obtain for the maximum allowable hydrogenation volumetric rate at the actual sulfur
content
V 2 = 3000 h
-1
. A more active catalyst, with a higher
k value , can be loaded even less.
This approach justified itself in the development of optimal loads for desulphurization units
at NIAP-KATALYZATOR LLC [7].
In recent years, the Claus process has become increasingly widespread in the purification of
gases with a high content of hydrogen sulfide (natural gas in the fields, associated gases of oil
production and refinery gases, etc.).
It consists of two stages:
Stage I – thermal oxidation of hydrogen sulfide to sulfur dioxide with air at 900–1350°C:
2H 2 S + 3O 2 → 2SO 2 + 2H 2 O At this stage, up to 70% wt . hydrogen sulfide and a significant amount of heat is released,
which must be utilized before the catalytic stage.
Stage II – catalytic conversion of hydrogen sulfide and sulfur dioxide at 220–250°C (Claus
reaction):
