The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1981
Filed:
Sep. 07, 1978
Alexander Hamilton, Giffnock, GB;
Colin Nelson, Barrhead, GB;
Ciba-Geigy Corporation, Ardsley, NY (US);
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.