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Application filed by Institutul De Chimie Macromoleculara "Petru Poni"filedCriticalInstitutul De Chimie Macromoleculara "Petru Poni"
Priority to RO80102962ApriorityCriticalpatent/RO81073A2/ro
Publication of RO81073B1publicationCriticalpatent/RO81073B1/ro
Publication of RO81073A2publicationCriticalpatent/RO81073A2/ro
Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications
(AREA)
Abstract
Procedeul de obtinere a schimbatorilor de ioni amfoteri cu grupari de acizi poliaminopolicarboxilici consta în reactia de carboximetilare dintre copolimeri stirevinilbenzen continînd 2...8% divinilbenzen clormetilati si apoi aminati cu etilendiamina, dietilentriamina, trietilentetramina, cu acid monocloracetic în mediu apos, la un raport copolimer aminat/apa de 1/3 1/5 g/ml li la un raport molar grupare aminica/acid monocloracetic de 1/3...1/5 timp de 10...15h la 80...90 degree C si pH =10...11, mentinut prin adaugarea treptata, în timpul reactiei de NaOH sau Na2CO3 sub forma de solutii apoase 20...40%.
RO80102962A1980-12-261980-12-26Procedeu de obtinere a unor schimbatori de ioni amfoteri
RO81073A2
(ro)
Procede de traitement d'eaux residuaires, notamment d'eaux residuaires renfermant des sels toxiques et dispositif en permettant la mise en oeuvre
DETERMINATION OF TOTAL WATER HARDNESS BY CONDUCTOMETRIC TITRATION WITH COMPLEXING AGENTS(DETERMINAREA DURITATII TOALE A APEI PRIN TITRARI CONDUCTOMETRICE CU COMPLEXONI)