【摘要】 对在水溶液中不同反应条件下淀粉与2-氯乙醇醚化的反应进行了研究。考察的因素包括碱处理时间与温度、氢氯化钠及2-氯乙醇的用量以及醚化时间与温度。结果表明,碱处理时间超过40min,摩尔取代度没有明显的变化。摩尔取代度随氢氧化钠用量的增加而提高,但达到最大值后则会降低。随醚化时间的延长,摩尔取代度增大,但10h以后则变化不大。醚化温度在53℃时可以得到较高的摩尔取代度。更多还原

【Abstract】 In water solution,etherification of starch with 2-chloroehanol is investigated under different condi-tions . Factors studied include alkali treat ment ti me and temperature ,amount of sodium hydroxide and 2-chloroehanolas well as etherification ti me and temperature . Results obtainedindicate that the degree of molar substitution( MS) hasno apparent changes for longer than 40 min alkali treat ment , MSincreases as the amount of sodiumhydroxideincreases .It attains a maxi mumand then decreases ,prolonging the reaction ti me up to 10his accompanied by enhancement in theextent of etherification.Longer reaction ti me has no effect on MS.The etherification temperature being higher or lowerthan 50℃causes a decrease in MS.更多还原