Process for the combustion of sulphur for the preparation of...

Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing

Reexamination Certificate

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C423S523000, C423S533000, C423S535000, C423S543000

Reexamination Certificate

active

06893622

ABSTRACT:
The invention relates to a process for the continuous preparation of oleum of a concentration of 10 to 45% by weight of SO3and/or sulphuric acid of a concentration of 94 to 100% by weight of H2SO4by combustion of sulphur with atmospheric oxygen according to the principle of superstoichiometric combustion, cooling the resultant sulphur-dioxide-containing gases to 350° C. to 500° C., catalytic conversion of these cooled gases to give sulphur-trioxide-containing gases in the presence of a vanadium-containing catalyst using single or double contact catalysis, absorption of the sulphur-trioxide-containing gases after cooling, if appropriate removal of liquids from the gases after absorption and energy recovery, with liquid sulphur being injected into the hot combustion gas stream perpendicular to the main direction of flow in the form of a fan using one or more bimodal fan-type nozzles.

REFERENCES:
patent: 3656900 (1972-04-01), Drechsel et al.
patent: 3907979 (1975-09-01), Jenniges
patent: 3936275 (1976-02-01), Perret et al.
patent: 4256721 (1981-03-01), Blakey et al.
patent: 5389354 (1995-02-01), Brändle et al.
patent: 5807530 (1998-09-01), Anderson
patent: 1 792 348 (1971-10-01), None
patent: 28 31 941 (1980-02-01), None
Ulmanns Encyklopaedie Der Technischen Chemie, Verlag, Chemie, Weinheim, De Bd. 21, 1982, Seiten 35-40, XP002255919 *das ganze document*, (no month).

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