Selective Removal of Hydrogen Chloride by Slaked Lime in a Fluidized Bed Reactor

Basic Study of the Reaction of Calcium Hydroxide with Hydrogen Chloride Using Single Crystals

“…In this process, calcium hydroxide (Ca­(OH) 2 ) is sprayed into the gas and then accumulates on the bag filter, where it reacts with HCl gas. This gas–solid reaction has been investigated in many studies. − To fully utilize the Ca­(OH) 2 sorbent, the ideal final product is CaCl 2 or any of its hydrates. However, it is known that the reaction of Ca­(OH) 2 with HCl under actual bag filter conditions is complex. The reaction is considered to involve at least two steps with CaOHCl or its hydrate as an intermediate .…”

Reaction of Tricalcium Aluminate with Hydrogen Chloride under Simulated Bag Filter Conditions

“…In these systems, Ca­(OH) 2 powder is blown into the flue gas before the bag filter where it reacts with HCl gas in a gas–solid reaction. This gas–solid reaction has been investigated in many studies. − Ideally, the chlorine is removed from the flue gas as calcium chloride (CaCl 2 ): Ca false( OH false) 2 + 2 HCl → CaCl 2 + 2 normalH 2 normalO The CaCl 2 can then be easily removed from ash by washing with water, which allows the ash to be reused for cement production. However, it has been reported that the major product of the gas–solid reaction at the bag filter is calcium oxychloride (CaClOH): Ca false( OH false) 2 + HCl → CaClOH + normalH 2 normalO …”