Process control

Details Process control Process control

1980-08-22

1981-11-17

Serwin, Ronald

Chemistry: physical processes

Physical processes

Crystallization

422 62, 422105, 422110, 422112, 364500, G01N 114, G01N 1102, G01N 3318

Patent

active

043009093

ABSTRACT:
A general purpose apparatus for measuring the chemical and physical state of flowing liquid materials and chemical additives and for introducing chemical materials to the stream uses a Venturi or other apparatus in which differential pressure is developed as an incident to fluid flow. It is arranged to be used both as a sample pump, a chemical additive pump, and as a differential pressure meter for use in calculating flow rates. The process method includes chemical addition at rates determined by pressure differential at the Venturi and for times which bear a selected relation to that differential pressure, temperature and the chemical state of the liquid. It also includes special temperature comparisons and flushing of chemical addition lines on an optional basis.

REFERENCES:
patent: 3721253 (1973-03-01), Remke
patent: 4053743 (1977-10-01), Niemi
patent: 4069413 (1978-01-01), Rutledge et al.
patent: 4094959 (1978-06-01), Ball et al.

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