Abstract
Jenssen towers for the industrial production of calcium bisulphite acid solutions are described together with their limitations. The need for increased specific throughput together with the use of low grade limestone as salting agent has led to a reconsideration of the process. Three phase fluidisation is considered as a means of engineering this reaction. The compatibility of the fluid dynamic requirements and the reaction stoichiometry is first discussed. Model reactors of 45 mm and 140 mm i.d. are described in which limestone particles from 0·6 to 10 mm dia. were treated with various concentrations of leaching liquor. The throughput capacity was measured, SO 2 was recovered and the conditions for calcium sulphite precipitation were discovered. The results are described in terms of the effect of particle size, gas velocity and the fluid dynamics of the system. They are compared with data from Jenssen towers and information is given to allow an assessment of the two processes to be made.
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