Automatic control of azo coupling processes in the manufacture o

Details Automatic control of azo coupling processes in the manufacture o Automatic control of azo coupling processes in the manufacture o

1977-09-29

1979-06-26

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260144, 260152, 260154, 260157, 260161, 260162, 260163, 260176, 260181, 260193, 260197, 260202, 260203, 260204, C09B 2900, C09B 3100, C09B 3110, C09B 3114

Patent

active

041592646

ABSTRACT:
Azo pigment coupling process in which the amount of excess diazo or coupling component is continuously monitored and addition of diazo component or coupling component to the reaction is automatically controlled by means of an automatic chemical analyzer which incorporates a dialyser module. The process involves a method of automatically controlling the coupling reaction by a continuous-flow chemical analyzer which continuously samples the reaction mixture and analyzes it for unreacted diazo or coupling component by dialysis and colorimetry, and automatically adjusts the rate of addition of this component to the reaction mixture to keep the concentration of unreacted component within a pre-set range during the period of the reaction.

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