The invention discloses a refining and purification method of dibenzyl ether, a by-product of benzyl alcohol, which mainly includes continuous oil-water sedimentation separation process of crude benzyl alcohol hydrolysis, crude benzyl alcohol hydrolysis distillation separation process and dibenzyl ether distillation purification process; crude benzyl alcohol hydrolysis product is cooled by cooler, enters sedimentation tank, oil-water separation is carried out in sedimentation tank, and crude light benzyl alcohol is separated by sedimentation. After that, the crude benzyl alcohol products enter the crude benzyl alcohol storage tank from the top of the settling tank; the crude benzyl alcohol products enter the crude distillation kettle in turn, and the crude benzyl alcohol products are crushed by steam, then water, benzyl alcohol, benzaldehyde and other low boiling point substances are separated from the top of the crude distillation tower, the temperature of the crude distillation kettle rises, and the crude benzyl alcohol content < 5% dibenzyl ether products are obtained at the bottom of the crude benzyl alcohol kettle; Dibenzyl ether (> 98%) was obtained by condensation of gas phase components continuously produced on the side line of the tower through the side line condenser.
【技术实现步骤摘要】
一种苯甲醇副产二苄醚的精制提纯方法
本专利技术涉及苯甲醇副产物处理领域,尤其涉及一种苯甲醇副产二苄醚的精制提纯方法。
技术介绍
二苄醚主要用作气相色谱固定液及硝化纤维素的增塑剂,也用于蘑菇和樱桃香精等香料的制备;用作硝酸纤维素、醋酸纤维素的增塑剂、树脂、橡胶、蜡、人造麝香等的溶剂;二苄醚与氧化锌的混合物是蚊、蝇、跳蚤的驱避剂。工业上利用氯化苄在碱性条件下水解生产苯甲醇,反应原理如下:C6H5CH2Cl+Na2CO3+H2O→C6H5CH2OH+NaCl+CO2↑该工艺在水解过程中,会有一部分氯化苄在碱性条件下反应生成二苄醚,反应原理如下:2C6H5CH2Cl+Na2CO3→C6H5CH2OCH2C6H5+2NaCl+CO2↑副产二苄醚含量较低,直接进入废水处理工序,造成资源浪费;同时,二苄醚副产物中的苯甲醇一同流入废水,造成苯甲醇浪费。
技术实现思路
为实现二苄醚的精制提纯,本专利技术采用以下技术方案:一种苯甲醇副产二苄醚的精制提纯方法,主要包括三个工序分别为a苯甲醇水解粗品连续沉降分离工序、b苯甲醇水解粗品粗馏分离工序和c二苄醚精馏提纯工序。a、苯甲醇水解粗品连续沉降分离工序苯甲醇水解粗品经冷却器冷却后,进入沉降槽,在沉降槽内进行油水分离,重相苯甲醇高盐废水由沉降槽底部流出进入废水储罐,轻相苯甲醇粗品经沉降分离后由沉降槽顶部进入苯甲醇粗品储罐。b、苯甲醇水解粗品粗馏分离工序苯甲醇粗品依次进入粗馏釜,粗馏塔,利用蒸汽进行减压粗馏,在粗馏塔顶先后分离出水、苯甲醇、苯甲醛等低沸点物质,粗馏釜温度上涨,粗馏釜底部得到重组分二苄醚粗品,将二苄醚粗品转移至二苄醚粗品储罐 ...
【技术保护点】
1.一种苯甲醇副产二苄醚的精制提纯方法,其特征在于,主要包括苯甲醇水解粗品连续油水沉降分离工序、苯甲醇水解粗品粗馏分离工序、二苄醚精馏提纯工序;1)甲醇水解粗品连续油水沉降分离工序:苯甲醇水解粗品经冷却器冷却,进入沉降槽,在沉降槽内进行油水分离,轻相苯甲醇粗品经沉降分离后由沉降槽顶部进入苯甲醇粗品储罐;2)苯甲醇水解粗品粗馏分离工序苯甲醇粗品依次进入粗馏釜,粗馏塔,利用蒸汽进行减压粗馏,在粗馏塔顶先后分离出水、苯甲醇、苯甲醛等低沸点物质,粗馏釜温度上涨,粗馏釜底部得到二苄醚粗品;3)二苄醚精馏提纯工序将二苄醚粗品连续加入至精馏塔,控制精馏塔塔釜温度,自精馏塔侧线连续采出气相组分经侧线冷凝器冷凝得到二苄醚成品。
【技术特征摘要】
1.一种苯甲醇副产二苄醚的精制提纯方法,其特征在于,主要包括苯甲醇水解粗品连续油水沉降分离工序、苯甲醇水解粗品粗馏分离工序、二苄醚精馏提纯工序;1)甲醇水解粗品连续油水沉降分离工序:苯甲醇水解粗品经冷却器冷却,进入沉降槽,在沉降槽内进行油水分离,轻相苯甲醇粗品经沉降分离后由沉降槽顶部进入苯甲醇粗品储罐;2)苯甲醇水解粗品粗馏分离工序苯甲醇粗品依次进入粗馏釜,粗馏塔,利用蒸汽进行减压粗馏,在粗馏塔顶先后分离出水、苯甲醇、苯甲醛等低沸点物质,粗馏釜温度上涨,粗馏釜...
【专利技术属性】
技术研发人员:贾永朋,杨勇,牛玉洁,李玉花,刘广杰,田泽荣,白新玉,周瑞兵,
申请(专利权)人:山东聊城中盛蓝瑞化工有限公司,
类型:发明
国别省市:山东,37
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