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. 08, 1991
Filed:
Oct. 24, 1989
Jeno Pelyva, Fuzfogyartelep, HU;
Laszlo Lendvai, Fuzfogyartelep, HU;
Sandor Balint, Balatonalmadi, HU;
Zoltan Kolonics, Balatonalmadi, HU;
Csaba Soptei, Veszprem, HU;
Sandor Laszlo, Fuzfogyartelep, HU;
Bela Karacsonyi, Budapest, HU;
Janosne Benczik, Balatonalmadi, HU;
Csaba Kayos, Veszprem, HU;
Sandor Silye, Veszprem, HU;
Nitrokemia Ipartelepek, , HU;
Abstract
The invention relates to an improvement of a process for preparing N-phosphonomethyl-glycine by oxydation of N-phosphonomethyl-imino-diacetic acid in an aqueous sulphuric acidic medium with hydrogen peroxide. A characteristic feature is using a waste acid liquor as reaction medium formed as aqueous sulphuric acid and obtained after the separation of N-phosphonomethyl-glycine when carrying out oxydation. This solution is optionally diluted with water until a concentration of 12-18 weight % of sulphuric acid and 3-5 weight % of N-phosphonomethyl-glycine.