Continuous diazotization process, wherein the rate of addition o

Details Continuous diazotization process, wherein the rate of addition o Continuous diazotization process, wherein the rate of addition o

1978-09-07

1981-01-20

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260142, 422108, 422110, 422119, 422187, 422197, C07C11304

Patent

active

042461715

ABSTRACT:
Automatically controlled continuous process for the diazotization or tetrazotization of aromatic amines in which the rate of addition of the inorganic nitrite is controlled by a polarovoltric method. The process comprises adding regularly and continuously to a reactor an aqueous slurry or solution of the amine containing sufficient acid for the diazotization process and simultaneously adding to the reactor a solution of an inorganic nitrite at a rate which is automatically regulated by a polarovoltric controller to ensure that a pre-selected concentration of unreacted nitrous acid is maintained in the reactor throughout the whole period of the reaction.

REFERENCES:
patent: 3117954 (1964-01-01), Hupfer
Buchler et al., Zeit. Anal. Chem., vol. 186, pp. 154-164 (1961).
Farbwerke (II), Chemical Abstracts, vol. 53, Item #21814a (1959).

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