石油炼制与化工 ›› 2025, Vol. 56 ›› Issue (2): 13-22.

• 催化剂 • 上一篇    下一篇

硅胶吸附剂吸附分离柴油中芳烃研究

蒋志超,杨彦强,王红超,乔晓菲,王德华   

  1. 中石化石油化工科学研究院有限公司
  • 收稿日期:2024-07-11 修回日期:2024-08-07 出版日期:2025-02-12 发布日期:2025-01-16
  • 通讯作者: 杨彦强 E-mail:yangyq.ripp@sinopec.com

STUDY ON ADSORPTION AND SEPARATION OF AROMATICS FROM DIESEL BY SILICA GEL

  • Received:2024-07-11 Revised:2024-08-07 Online:2025-02-12 Published:2025-01-16

摘要: 通过金属离子改性和无机酸改性的方式,制得不同孔径分布的硅胶吸附剂,采用静态吸附法和动态脉冲法,研究吸附剂对柴油中芳烃和烷烃的分离特性。结果表明:硅胶吸附剂对双环芳烃的选择性大于单环芳烃;随着芳烃侧链碳数的增加,吸附剂对芳烃的选择性降低;当存在含硫化合物时,吸附剂对芳烃的选择性几乎不变;当存在含氮化合物时,吸附剂对单环芳烃的选择性降低;在60~170℃内,随着吸附温度的升高,各组分的保留体积减小,吸附脱附速率加快,确定100~140℃为最佳分离温度;随着吸附剂孔径的增大,组分的传质速率增大,吸附剂对组分的分离度减小;改性后,吸附剂的传质性能提高,对芳烃组分的分离度提高。对于吸附剂A,当吸附剂孔径从2.2nm增加到2.4nm时,对长侧链烷基苯的选择性提高。

关键词: 硅胶吸附剂, 静态吸附法, 动态脉冲法, 芳烃烷烃分离, 含硫化合物, 含氮化合物

Abstract: Silica gel adsorbents with different pore size distributions were prepared by modifying with metal ions and inorganic acids. The separation characteristics of adsorbents for aromatics and alkanes was studied by the static adsorption method and dynamic pulse method. The research results indicated that the selectivity of silica gel adsorbent for bicyclic aromatics was greater than that for monocyclic aromatics. With the increasing of the carbon number of alkylbenzene, the selectivity decreased.When sulfur-containing compounds were present, the selectivity of the adsorbent to aromatics remained almost unchanged. When nitrogen-containing compounds were present, the selectivity of the adsorbent to monocyclic aromatics decreased. Within the range of 60—170 ℃, as the adsorption temperature increased, the retention volume of each component decreased and the adsorption and desorption rate accelerated. The optimal separation temperature was 100—140 ℃. With the increasing of adsorbent pore size, the mass transfer rate of the components increased, but the separation degree decreased. The mass transfer performance of modified adsorbent was improved and the separation degree of aromatics was enhanced. For adsorbent A, with the pore size increasing from 2.2nm to 2.4nm, the selectivity to long-chain alkylbenzene improved.

Key words: silica gel adsorbent, static adsorption method, dynamic pulse method, aromatics-alkane separation, sulfur-containing compound, nitrogen-containing compound