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US 4,283,374 AGranted
Regenerable manganese oxide hot gas desulfurization process
OwnerDonald C. Ericksoninventor
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Abstract
A continuous regenerative process for desulfurizing a hot reducing gas is disclosed. The gas is scrubbed by a sorbent containing MnO and Mn.sub.3 O.sub.4. The spent sorbent is regenerated by reacting the MnS with an excess of Mn.sub.3 O.sub.4, contained in oxidized sorbent. The oxidized sorbent is obtained by reacting part of the regenerated sorbent with air. In the regenerator the gaseous oxygen partial pressure is maintained below 10.sup.-6 atmospheres which allows the SO.sub.2 partial pressure to be maintained above 1 atmosphere without causing sulfation.
Claims6
A continuous regenerative process for desulfurizing a hot reducing gas comprising:
- a. contacting the reducing gas with sorbent wherein the active sulfur absorbing component of the sorbent consists essentially of between 60% and 98% MnO and between 2% and 40% Mn.sub.3 O.sub.4, whereby H.sub.2 S reacts with the sorbent to form MnS containing spent sorbent;
- b. contacting the MnS containing spent sorbent with oxidized sorbent containing Mn.sub.3 O.sub.4, wherein Mn.sub.3 O.sub.4 is supplied in an amount between 2% and 30% greater than the stoichiometric amount necessary for reaction with the MnS content of the spent sorbent, whereby SO.sub.2 is generated and the said sorbent is regenerated;
- c. withdrawing the SO.sub.2 at a controlled pressure between 1 and 30 atmospheres:
- d. recycling between 10% and 40% of the regenerated sorbent to additional reducing gas contact;
- e. contacting the remainder of the regenerated sorbent with a molecular oxygen containing gas, whereby the oxidized sorbent is obtained;
- f. recycling the oxidized sorbent to additional contact with the spent sorbent.
3 more elements
Dependencies are inferred from the claim text.