The dehydration technology of bischofite by butanol complexation
distillation was studied by such methods as X-ray diffraction
and elementary analysis.The results show that the dehydration efficiency improves with the increase of the amount of butanol during the continuous
distillation dehydration process;the first four coordinated water molecules in bischofite can be more easily taken away than the last two coordinated water molecules,especially the last one;the ultrasonic
pretreatment of the bischofite butanol solution is beneficial to deep dehydration of bischofite and high utilization efficiency of butanol;the dewatering rate of bischofite increases when prolonging the ultrasonic pretreatment time;the dewatering rate reaches 90.25% when ultrasonic pretreatment time is 15 min and the total amount of butanol reaches 10 times of original butanol.However, dewatering rate is only 84.86% when there is no ultrasonic pretreatment.The single butanol complexation dehydration technology cannot take all coordinated water molecules in bischofite away.