Patent · US Expired

Method and apparatus for the manufacture of N,N'-bis-(aroyl)hydrazines

US4550204A · kind A · utility

4Cited by

6References

15Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Wolfgang von Gentzkow · Kleinsendelbach, DE
Manfred Schmiedel · Bremerhaven, DE
Reinhold Tussing · Burgkunstadt, DE

Key dates

Filing date	Mar 10, 1983
Grant date	Oct 29, 1985
Priority date	—
Expiry date	Mar 10, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C241/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to a method and apparatus for the manufacture of N,N'-bis-(aroyl)hydrazines from hydrazine and arylcarboxylic acid alkyl esters in the presence of catalysts. According to the invention, the reaction ingredients are reacted in a substantially stoichiometric mass ratio in an inert medium of low volatility which is liquid to wax-like under reaction conditions, in a suitable reactor equipped with a centrifugal disc and connected to a cycling, separating and draining-off system and a dispersion head to form a paste-like product. The paste-like compound can be used as a metal deactivator in polyolefin which is in direct contact with copper, for instance, in cable and wire insulation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.