Experimental discussion on the effect of carboxylic acid addition on the specific surface area of calcium hydroxide powder generated from calcium oxide

摘要

The dioxin from the arbage incineration is one of the most serious environmental problems inrecent years. There is a method using calcium hydroxide [CaCOH)2] as one of the dioxin preventivemethods, reacting in the present garbage incineration and removing the chlorine in combustionexhaust gas. The formation mechanism of specific surface in the calcium hydroxide powdergenerated by reaction from quicklime is not sufficiently elucidated up to now.Calcium hydroxide was thought to decrease specific surface area until now in the case wherecarboxylic acid is used as an addition in calcium hydroxide reaction.In this paper, the applicability of carboxylic acid to calcium hydroxide reaction, and themorphology formation mechanism of the specific surface of calcium hydroxide is experimentallydiscussed. As a result, a new triple product factors of the alkyl chain length of the added carboxylicacid, the acidity and the interaction between carboxylic acid and water, were successfully introducedto be reasonably described the experimental result between specific surface area andamount of acid.And, the optimum alkyl chain ength was experimentally pointed out to exist at 5 showing themaximum specific surface area of calcium hydroxide. Also, the increment effect to specific surfacearea by carboxylic acid addition was shown to be maximum at 0.05 of the amount of carboxylicacid.