椰油酰氧乙基磺酸钠的合成与性能

以椰子油酸和羟乙基磺酸钠为原料,在催化剂存在下,通过脱水反应制得椰油酰氧乙基磺酸钠,考察了投料摩尔比、催化剂用量、真空度、温度、时间等对反应的影响。最佳反应条件为:n(椰子油酸)/n(羟乙基磺酸钠)=1 3,w(催化剂)=0 5%,真空度25kPa,235℃,反应3h,在该条件下,产物中w(椰油酰氧乙基磺酸钠)=77 0%,羟乙基磺酸钠的转化率为91 3%,产品外观为淡黄色粉末。性能分析结果表明:该产品的表面张力和临界胶束浓度分别为30 11mN/m和1 26×10-3mol/L,在去离子水和c(CaCO3)=0 3mmol/L的硬水中的润湿力分别为448s和440s、发泡力分别为240mm和232mm、去污力(△R)分别为44 6和43 7。

Synthesis and Property of Sodium Coconut Acyloxyethanesulfonate

With coconut acid(Ⅰ) and sodium hydroxyethanesulfonate(Ⅱ) as raw materials,sodium coconut acyloxyethanesulfonate(Ⅲ) is synthesized by dehydration reaction in the presence of catalyst.The optimum reaction conditions are n(Ⅰ)/n(Ⅱ)=1.3,w(catalyst)=0.5%,vacuum capactive of the system 25 kPa,reaction temperature 235 ℃ and reaction time 3 h.Under these conditions,conversion of Ⅱ is 91.3%,the product is brown-yellow powder,and content of Ⅲ in the product is 77.0%.Experimental results show that the surface tension of the product is 30.11 mN/m,and the critical micelle concentration is 1.26×10~(-3) mol/L.In deionized water and in hard water〔c(CaCO_3)=0.3 mmol/L〕,the wettabilities of the product are 448 s and 440 s,foamabilities are 240 mm and 232 mm,and decontaminabilities(△R) are 44.6 and 43.7 respectively.