Patent ID: 7998446
Filing Date: 2011-08-16
Classification: B01D,C01B,C01F

Abstract:
1. A flue gas desulfurization process which comprises (i) contacting a SO (ii) diverting a portion of the recirculating aqueous sulfuric acid stream for recovery of the additional sulfuric acid as gypsum in a neutralization step, in which sufficient neutralizing agent selected from limestone, lime and calcium hydroxide is introduced into the diverted aqueous sulfuric acid stream portion to neutralize the sulfuric acid present and produce a gypsum product; (iii) refortifying the recirculating aqueous sulfuric acid stream with concentrated hydrogen peroxide to maintain a steady state H (iv) evaporating free water from the diverted and neutralized portion of the recirculating aqueous sulfuric acid stream, using the heat of reaction generated during the neutralization step, to yield a gypsum product that is substantially dry.