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Title:	The removal HCl from hot gases with calcium compounds
Author:	Lao, Qian
View Online:	njit-etd1992-041 (xi, 87 pages ~ 2.9 MB pdf)
Department:	Department of Chemical Engineering, Chemistry and Environmental Science
Degree:	Master of Science
Program:	Applied Chemistry
Document Type:	Thesis
Advisory Committee:	Shaw, Henry (Committee chair) Perlmutter, Howard David (Committee member) Kebbekus, Barbara B. (Committee member)
Date:	1992-05
Keywords:	Gases -- Absorption and adsorption Chlorohydrocarbons -- Environmental aspects Calcium Hazardous wastes -- Incineration Hydrogen chloride gas
Availability:	Unrestricted
Abstract:	The use of CaCO3, Ca(OH)2, and CaO as adsorbents for removal of HCl from hot gas streams is investigated through a series of experiments. The experiments are conducted to evaluate the influence of key parameters such as temperature, (500 K to 1000 K), particle size, (0.037 mm to 3.36 mm), pressure drop of the packed bed, (0.1 cm H2O to 25.5 cm H2O), and concentration of CCl in the feed gas, (1,550 ppm to 20,000 ppm), on HCl adsorption. The results of these experiments show that all three of the calcium compound powders are excellent adsorbents when used in their individual active temperature ranges. The active temperatures are: Ca(OH)2, 600 K to 700 K; CaO, 700 K to 800 K; and CaCO3, 700 K to 850 K. The highest reactant conversion rate for each compound is: Ca(OH)2, 75.5%; CaO, 65%; and CaCO3, 80.5%. When calcium compound particles are pretreated at temperatures over 1000 K, but below 1100 K, adsorbents with large surface area were produced, which allowed much higher conversion rates with relatively low pressure drop. The conversion rate of these adsorbents, measured as amount of calcium used, are all improved by a factor of three.