Synthesis of hydroxamic acids with lard
PU Xiang-ming · Journal of Central South University of Technology(Natural Science) · 2004
Hydroxamic acids, containning C_(14), C_(16), C_(18),C_(20) and a little unsaturated alkyl hydroxamic acids were synthesized with hydroxylamine and lard by methyl ester method and the glycerin ester method , the effect factors of reaction were investigated and then the optimum conditions were obtained.The results show that the conversion rate can reach (70.2%) when w(Lard)∶(w(NaOH)∶)w(NH_2OH·HCl) is 5.00∶1.00∶1.34, reaction at 45 ℃ and reaction time for 6 h by the methyl ester method; when w(Lard)∶w(NaOH)∶(w(NH_2OH·HCl)) is 5.00∶1.00∶(1.34,) reaction at 45 ℃ for 8 h , the conversion rate is 60.1% by the glycerin ester method. By the glycerin ester method, alcoholization with poisonous and noxious methanol is unnecessary, the cost of hydroxamic acids can be reduced obviously. The solid mixture products can be used directly in flotation industry.