The formaidehyde-free finishing agent 4,5-di-hydroxy-1,3-dimethy1-2-imidazolidinone(DMeDHEU)was prepared by the reaction of 1,3-dimethylurea and glyoxal.The reaction rate and equilib-rium conversion in relation to pH ...The formaidehyde-free finishing agent 4,5-di-hydroxy-1,3-dimethy1-2-imidazolidinone(DMeDHEU)was prepared by the reaction of 1,3-dimethylurea and glyoxal.The reaction rate and equilib-rium conversion in relation to pH value,molar ratio,temperature and catalyst were studied.The conversionto DMeDHEU,catalyzed with citric acid/anhydrousNaAc,reached 95% in 6 hours at 40℃, pH 5.5 andmolar ratio 1.2.展开更多
2,4Dimethyl2(4methyl3Pentenyl)1,3dioxolane were synthesized with the phosphotungstic acid supported on cationic exchange resin as a catalyst.Various factors that affect the condensation yield were inve...2,4Dimethyl2(4methyl3Pentenyl)1,3dioxolane were synthesized with the phosphotungstic acid supported on cationic exchange resin as a catalyst.Various factors that affect the condensation yield were investigated.The results showed that the optimum conditions were as follows:6methyl5heptene2one:1,2Propandiol:catalyst:dehydrating agent is 1 mol:15mol∶12g∶200ml;reaction temperature was reflux temperature;reaction time was 25h.The yield was above 915% under the optimum conditions.The catalyst can be used repeatedly.展开更多
文摘The formaidehyde-free finishing agent 4,5-di-hydroxy-1,3-dimethy1-2-imidazolidinone(DMeDHEU)was prepared by the reaction of 1,3-dimethylurea and glyoxal.The reaction rate and equilib-rium conversion in relation to pH value,molar ratio,temperature and catalyst were studied.The conversionto DMeDHEU,catalyzed with citric acid/anhydrousNaAc,reached 95% in 6 hours at 40℃, pH 5.5 andmolar ratio 1.2.
文摘2,4Dimethyl2(4methyl3Pentenyl)1,3dioxolane were synthesized with the phosphotungstic acid supported on cationic exchange resin as a catalyst.Various factors that affect the condensation yield were investigated.The results showed that the optimum conditions were as follows:6methyl5heptene2one:1,2Propandiol:catalyst:dehydrating agent is 1 mol:15mol∶12g∶200ml;reaction temperature was reflux temperature;reaction time was 25h.The yield was above 915% under the optimum conditions.The catalyst can be used repeatedly.
