HYDROLYSIS OF SIMAZINE UNDER ALKALINE CON DITIONS

Citation
K. Hosoi et al., HYDROLYSIS OF SIMAZINE UNDER ALKALINE CON DITIONS, Nippon kagaku kaishi, (9), 1995, pp. 749-752
Citations number
11
Language
GIAPPONESE
art.tipo
Note
Categorie Soggetti
Chemistry
Journal title
ISSN journal
0369-4577
Issue
9
Year of publication
1995
Pages
749 - 752
Database
ISI
SICI code
0369-4577(1995):9<749:HOSUAC>2.0.ZU;2-6
Abstract
The kinetics of chemical hydrolysis of simazine (2-chloro-2,6-bis (eth ylamino)-1,3,5-triazine) was investigated under alkaline conditions. T he rate constants (k) and half-lives(t(1/2)) were determined, and then activation energy (E(a)) of hydrolysis of simazine was calculated. Si mazine was easily hydrolyzed in NaOH solution. The hydrolytic rate inc reased with raising the reaction temperature and increasing the amount of NaOH. The rate constants(k) at 60, 70 degrees C and 80 degrees C w ere 0.0684(s(-1)), 0.127(s(-1)) and 0.236(s(-1)), respectively. The ha lf-lives(t(1/2)) at 60, 70 degrees C and 80 degrees C were 10.13(h), 5 .46(h) and 2.94(h), respectively. The activation energy (E(a)) of hydr olysis was 6.04 x 10(4)(J mol(-1)), this value agreed with the one cal culated by Burkhard et al. Simazine would be hydrolyzed by the mechani sm as flows; chloro substituents linked to triazine ring are reacted w ith by hydroxide ions to form hydroxy substituents. The liberated chlo ride ions are reacted with water, so that hydrochloric acid is formed. The resulted hydrochloric acids are neutralized by NaOH.