(397h) Preparation and Its Selective Adsorption Property of Asphalt-Based Carbon Materials for Effictive Separation of Light Hydrocarbons Methane/Ethane/Propane

Authors: 
Li, Z., South China University of Technology
Xiao, H., South China University of Technology
Lv, D., South China University of Technology
Xiao, J., South China University of Technology
Xia, Q., South China University of Technology

Preparation and its Selective
Adsorption property of Asphalt-based Carbon Materials for Effictive
Separation of Light hydrocarbons Methane/Ethane/Propane

Wanwen Liang1, Huiyu
Xiao1, Daofei Lv1, Jing Xiao2**,
Qibin Xia1, Zhong
Li1*

1 School of Chemistry and Chemical Engineering, South China
University of Technology
, Guangzhou
510640, PR China

2 The Key Laboratory of Enhanced Heat Transfer and Energy
Conversation Ministry of Education, South China
University of Technology, Guangzhou 510640, PR China

ABSTRACT

We used asphalt as carbon source to prepare a series of novel asphalt¨Cbased activated carbons (A-ACs) for
efficient separation of light hydrocarbons in pectrochemistry
industries, especially recovery C2H6 and C3H8
from Natural gas. A-ACs were prepared by an one-step
preparation method and then characterized. The adsorption isotherms of C3H8,
C2H6 and CH4 on A-ACs were measured at
different temperatures, and the dynamic separation performance of the samples
were investigated by fixed bed experiments. The results showed that (a) the BET
surface area of the resulting A-ACs reached as high as 2928-3131 m2/g
with pore volumes of 1.60-2.10 cm3/g, and meanwhile the surface O
and N contents of A-ACs gradually decreased with the KOH/asphalt ratio increasing
at which A-ACs were prepared; (b) the sample prepared at 1073 K and the
KOH/asphalt ratio = 4 (A-AC-4) exhibited a superior C3H8
and C2H6 adsorption capacity of 11.76 and 6.59 mmol/g at 298 K and 100 kPa, respectively; (c) the IAST-predicted
C2H6/CH4 selectivity of the samples
A-AC-3 and A-AC-4 reached 16.9 and 15.1, respectively, at 298 K and 100 kPa, and
meanwhile the IAST-predicted C3H8/CH4 selectivity
of the samples A-AC-3 and A-AC-4 reached as high as 76.6 and 88.8, respectively
at 298 K and 100 kPa; (d) C3H8/C2H6/CH4  (0.05/0.1/0.85) mixture can be well separated in the fixed bed packed with the sample A-AC-3
or the sample A-AC-4.

Keywords: Asphalt, Porous carbons, light hydrocarons, Adsorption separations, Isotherms, Selectivity





* Corresponding
author. Tel: +86 20 87110608 Fax: +86 20 87110608 E-mail: cezhli@scut.edu.cn
(Z. Li).

** Corresponding author Tel: +86 20 87113513 Fax: +86 20 87113513
E-mail: cejxiao@scut.edu.cn(J. Xiao);