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Application filed by Teodora Panea, Maria Simion, Doina Marieta NicoarafiledCriticalTeodora Panea
Priority to RO7997867ApriorityCriticalpatent/RO77879A2/en
Publication of RO77879B1publicationCriticalpatent/RO77879B1/en
Publication of RO77879A2publicationCriticalpatent/RO77879A2/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Inventia se refera la un procedeu pentru prepararea hidrazidei maleice prin reactia sulfatului de hidrazina cu anhidrida maleica, în prezenta de hidroxid de sodiu, si anume hidroxidul de sodiu se introduce sub forma de solutie apoasa, de 10% reprezentând aproximativ 23% din cantitatea teoretica necesara pentru punerea în libertate a întregii cantitati de hidrazina din sulfatul sau.The invention relates to a process for the preparation of maleic hydrazide by the reaction of hydrazine sulfate with maleic anhydride in the presence of sodium hydroxide, namely sodium hydroxide is introduced as an aqueous solution of 10% representing about 23% of the theoretical amount required for releasing the entire amount of hydrazine from its sulphate.
RO7997867A1979-06-161979-06-16
PROCEDURE FOR PREPARING MALICAL HYDRAZIDES
RO77879A2
(en)
Process for the preparation of phosphoric acid and calcium sulphate anhydrite as well as phosphoric acid and calcium sulphate anhydrite obtained by this process