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Title:
NEUTRALIZATION CONTROL OF SOLUTION
Document Type and Number:
Japanese Patent JPH0780476
Kind Code:
A
Abstract:

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.


Inventors:
ARAKAWA AKIO
SEKIMIZU KOICHI
NODA TETSUYA
SEKI HIDEJI
MANO KIYOSHI
Application Number:
JP22887193A
Publication Date:
March 28, 1995
Filing Date:
September 14, 1993
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
C02F1/66; G05D21/00; G05D21/02; (IPC1-7): C02F1/66; C02F1/66; G05D21/00; G05D21/02
Attorney, Agent or Firm:
Inomata Shoaki