Kinetic study of the reaction between sodium chloroacetate and potassium ethylxanthogenate

Abstract

The reaction kinetics of the synthesis of sodium ethyl xanthogeneacetate from potassium ethylxanthogenate and sodium chloroacetate in distilled water as the reaction medium at 25, 30, 35 and 40°C, were investigated. The obtained reaction mixture was a complex system which demanded the use of two methods for the kinetic measurements. The reaction was followed using the conductrometric and UV/Vis spectrophotometric method with equimolar initial concentrations of the reactants and under pseudo-first order conditions with respect to one of the reactants. The rate constants of the pseudo-first order and second order reactions were calculated from the data. On the basis of the reaction constants, the activation parameters were calculated and are discussed.

Ispitivana je kinetika reakcije sinteze natrijum-etil-ksantogen-acetata iz kalijum-etil-ksantogenata i natrijum-hloracetata u destilovanoj vodi kao reakcionom medijumu i temperaturama 25, 30, 35 i 40°C. Reakciona smeša je kompleksan sistem koji je zahtevao korišćenje dve metode za kinetička merenja. Reakcije su praćene korišćenjem spektrofotometrijske i konduktometrijske metode pri ekvimolarnim početnim koncentracijama reaktanata kao i pri uslovima reakcija pseudo-prvog reda u odnosu na jedan od reaktanata. Reakcione konstante pseudo-prvog reda i drugog reda izračunate su na osnovu kinetičkih podataka. Na osnovu reakcionih konstanti izračunati su i diskutovani takođe i aktivacioni parametri.