PURPOSE: To shorten a neutralization time while reducing the overshoot at a pH value regardless of the kind of a soln.
CONSTITUTION: The concn. of a neutralizing agent contributing to neutralization is estimated and the absorption ration of the neutralizing agent, that is, the degree of electrolytic dissociation of a weak acid is calculated from the relation between the concn. of the neutralizing agent and the concn. of a hydrogen ion and, on the basis of the calculated value, the necessary feed amt. of the neutralizing agent is estimated to operate a neutralizing agent feed pump. Since the absorptivity of the neutralizing agent is renewed at every time, a neutralizing time becomes short. Since the time constant of stirring is considered, the overshoot of a pH value caused by the charging delay of the neutralizing agent is reduced.
SEKIMIZU KOICHI
NODA TETSUYA
SEKI HIDEJI
MANO KIYOSHI