减压精馏法精制二甲基亚砜  

Refining of Dimethyl Sulfoxide by Vacuum Distillation

作　　者：胡洁[1] 陈飞月 李东风[1] 吴晓枫 HU Jie;CHEN Feiyue;LI Dongfeng;WU Xiaofeng(Xingtai University,Xingtai 054001,China)

机构地区：[1]邢台学院,河北邢台054001

出　　处：《化学与生物工程》2021年第2期45-48,共4页Chemistry & Bioengineering

基　　金：邢台市科技计划项目(2019ZC093)。

摘　　要：以聚丙烯腈基碳纤维生产过程中的纺丝废液为原料,采用间歇减压精馏工艺及先间歇常压精馏除水后减压精馏工艺对比研究了精馏过程中精馏塔各塔段温度和二甲基亚砜浓度的变化,并采用气相色谱法测定了馏分中二甲基亚砜浓度。结果表明,在间歇减压精馏工艺中,当塔釜二甲基亚砜浓度为81%、第一塔段温度为77.1℃时,塔顶开始有馏分流出,馏分中二甲基亚砜浓度高达41%。在先间歇常压精馏除水后减压精馏工艺中,当第一塔段温度为98.5℃时,塔顶开始有馏分流出,馏分中二甲基亚砜浓度为1%;随着时间的延长,第一塔段温度逐渐升高并稳定在100℃,塔顶二甲基亚砜浓度逐渐升高并稳定在98%,此时塔釜二甲基亚砜浓度为100%,馏分中二甲基亚砜浓度高达100%。可选用先间歇常压精馏除水后减压精馏工艺回收纺丝废液中的二甲基亚砜。Using the spinning waste liquid in the production of PAN-based carbon fibers as a raw material,we comparatively studied the changes of temperature and dimethyl sulfoxide(DMSO)concentration of each tower section when two technological processes such as the batch vacuum distillation and the batch distillation water at atmospheric pressure followed by vacuum distillation process were adopted,and determined the DMSO concentration in distillate by gas chromatography.The results show that,in the technological process of batch vacuum distillation,when the DMSO concentration in the tower bottom is 81%and the temperature of the first tower section is 77.1℃,the distillate begins to flow out,and the DMSO concentration in the distillate is up to 41%;in the technological process of batch distillation water at atmospheric pressure followed by vacuum distillation,when the temperature of the first tower section is 98.5℃,the distillate begins to flow out,and the DMSO concentration in the distillate is 1%;with the increase of time,the temperature of the first tower section increases and tends to be stable 100℃,the DMSO concentration in the tower top increases and tends to be stable 98%,at this point,the DMSO concentration in tower bottom is 100%,and the DMSO concentration in the distillate is as high as 100%.The study indicates that DMSO can be recovered from spinning waste liquid by the technological process of batch distillation water at atmospheric pressure followed by vacuum distillation.

关 键 词：二甲基亚砜 精馏塔 减压精馏 精制 回收 

分 类 号：TQ227.3[化学工程—有机化工] TQ028.13