NaA沸石膜渗透蒸发脱除二氯甲烷中的痕量水.pdf

石油化工
2011年第40卷第12期
PETROCHEMICAL TECHNOLOGY
?1297
NaA沸石膜渗透蒸发脱除二氯甲烷中的痕量水
罗钢元',周志辉·2,刘红',王金渠2,周建国
(1.武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081;
2.大连理大学精细化工国家重点实验室,辽宇大连116012;3.内蒙古包钢和发稀土有限公司,内蒙古包头014030
[摘要]利用热浸渍法在Q-Al2O3载体管外表面锁涂晶种,水热合成了NaA沸石膜;采用NaA沸石膜进行了分离水ー二氯甲烷
的研究。考察了进料流量、渗透侧压力和进料温度对水的渗透通量和分离因数的影响。实验结果表明,合成的NaA沸石膜厚度
约为24um,与载体结合紧密,膜连续月致密;随进料流量的增加,滲透通量和分离因数均増大;随渗透侧压力的增大,渗透通量减
小,分离因数未发现明显变化;随进料温度的升高,渗透通量增大,分离因数减小;在进料流量198mL/min、进料温度25℃、渗透
侧压力0.1kPa、进料侧压力0.1MPa的条件下,水的渗透通量和分离因数分别达到0.172kg/(m2?h)和39900
关键词]氧化铝载体;NaA沸石膜;滲透蒸发;脱除痕量水;二氯甲烷;膜分离
文章编号]1000-8144(2011)12-1297-05
中图分类号]TQ028,8
文献标识码]A
Removal of race Water from Dichloromethane by Pervaporation
nith NAA Zeolite Membrane
Luo Gangyuan, Zhou Zhihui, 2 Liu Hong, Wang Jinqu?, Zhou Jianguo
(1. Hubei Key Laboratory for Efficicnt Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of
Science and Technology, Wuhan Hubei 430081, China; 2. State Key Laboratory of Fine Chemicals, Dalian University of Technology
Dalian Liaoning 1 16012, China; 3. Nei Mongol Baotou Stcel Hefa Rare Earth Co. Ltd, Baotou Nei Mongol 014030, China)
I Abstract NAA zeolite membranes were hydrothermally synthesized on the outer surface of tubular a
Al, O, with seeding by a hot dip-coating method. The NAA zeolite membranes were applied to removal
of trace water from dichloromethane. The influences of the feed flow, permeation side pressure and
feed temperature on the water flux and the separation factor were investigated. The results showed that
the synthesized membranes with thickness about 24 wm were continuous and dense, and were
combined firmly with the A-AL O substrate. With the feed flow increasing, both the permeation flux
and the separation factor increased. With the permeation side pressure increasing, the permeation flux
d
ed and the separation factor did not change significantly. With the feed temperature rise, the
permeation flux increased but the separation factor decreased. Under the conditions of feed flow 198 ml/
min, feed temperature 25 C and permeate side pressure 0. 1 kpa, feed side pressure 0. 1 Mpa, the water
permeation flux and the separation factor could reach 0. 172 kg/(mh) and 39900, respectively
I Keywords! Al, O; support; NAA zeolite membrane; pervaporation; removal of
trace water;
dichloromethane; membrane separation
二氯甲烷由于毒性小、溶解能力大,作为溶剂好的应用前景,近年来作为无机膜的一个重要分
得到了广泛应用,但在使用过程中很容易带入水。支,在国内外得到了广泛的研究。目前制备和研究
含水的二氯甲烷经一次恒沸精馏脱水后含水量一的沸石膜主要有LTA型(NaA)、FAU型(NaY
般为0.2%(w)。为了脱除二氯甲烷中的痕量水,和NaX)”、MHI型-3、MOR型( Morde
工业上通常采用吸附或多次恒沸精馏等工艺进行
处理,但存在二氯甲烷回收率低、能耗高和操作费
收稿日期]2011-06-17;[修改稿日期]2011~-09-01。
用高等问题-?
作者简介]罗钢元(1987ー),男,湖南省衡阳市人,硕土生。联系
人:周志辉,电话13872094049,电邮huihui080ohotmail.com。
沸石膜在膜分离?和膜反应器?方面具有很『基金项目!国家自然科学基金项目(000