水氯镁石的丁醇络合蒸馏脱水工艺

来源期刊：中南大学学报(自然科学版)2006年第1期

论文作者：伍上元 周向阳 李劼 刘宏专 徐日瑶

文章页码：47 - 51

关键词：水氯镁石;丁醇;蒸馏;超声波;脱水

Key words：bischofite; butanol; distillation; ultrasound; dehydration

摘    要：采用X射线衍射及元素分析方法研究了水氯镁石的丁醇络合蒸馏脱水工艺。研究结果表明:在连续蒸馏法脱水过程中,水氯镁石的脱水率随着丁醇用量的增加而提高;水氯镁石最初4个结晶水分子较容易脱除,后2个结晶水特别是最后1个结晶水难以脱除。采用超声波预处理水氯镁石丁醇溶液有利于水氯镁石的深度脱水及丁醇利用率的提高;随着超声波预处理时间的延长,水氯镁石的脱水率提高;当超声波预处理水氯镁石丁醇溶液时间为15 min及丁醇的添加总量为原始添加量的10倍时,水氯镁石的脱水率达到90.25%;而无超声波预处理时脱水率仅为84.86%。采用单纯的丁醇络合脱水方法难以完全脱除水氯镁石中的结晶水。

Abstract: 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.