石油炼制与化工

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NaY分子筛的改性及对FCC汽油选择吸附脱硫的研究

朱赫礼 高翔 宋丽娟 孙兆林   

  1. 锦西石化分公司 辽宁石油化工大学 辽宁石油化工大学 辽宁石油化工大学
  • 收稿日期:2008-12-01 修回日期:1900-01-01 出版日期:2009-09-12 发布日期:2009-09-12
  • 通讯作者: 朱赫礼

STUDY ON THE SELECTIVE ADSORPTIVE DESULFURIZATION OF FCC NAPHTHA BY MODIFIED ZEOLITE Y

Li-juan Song   

  • Received:2008-12-01 Revised:1900-01-01 Online:2009-09-12 Published:2009-09-12

摘要: 利用草酸对NaY分子筛进行脱铝改性制备了NH4Y分子筛,NH4Y分子筛经过焙烧制得HY分子筛,再用实验制得的NH4Y分子筛进行液相离子交换和焙烧制得Ce(Ⅳ)Y分子筛。对分子筛进行静态吸附脱硫对比实验,并利用微库仑综合分析仪对静态和动态处理过的FCC汽油样品进行硫含量测定。结果表明,在静态条件下,Ce(Ⅳ)Y比HY分子筛的吸附脱硫效果略好,二者吸附脱硫率分别为79.0%和77.8% 。在动态条件下,Ce(Ⅳ)Y分子筛能够脱掉HY分子筛较难脱除的二甲基噻吩类硫化物。再生后的成型Ce(Ⅳ)Y分子筛的吸附能力可达到新鲜Ce(Ⅳ)Y分子筛的95.5%。

关键词: 脱铝, 吸附脱硫, 催化裂化, DMTs

Abstract: NaY zeolite was dealuminated by oxalic acid and ion-exchanged with NH4Cl to form NH4Y. Then HY was obtained by calcining NH4Y, and Ce(IV)Y was prepared by ion-exchanging NH4Y with cerium nitrate solution and calcination. Selective adsorptive desulfurization of FCC naphtha over various zeolite Y samples was conducted and the sulfur contents of naphtha samples were analyzed by microcoulometry. Static adsorption results showed that the sulfur removal rates of zeolite Y samples from high to low were in the order of Ce(IV)Y>HY>NaY; sulfur removal rates of Ce(IV)Y and HY were 79.0% and 77.8%, respectively. Kinetic adsorption results showed that dimethylthiophene (DMT) type sulfur containing compounds could be removed by Ce(IV)Y, but could not be removed by HY. The adsorption capacity of the regenerated Ce(IV)Y zeolite reached 95.5% of the fresh one.

Key words: dealumination, adsorptive desulfurization, catalytic cracking, DMTs