Study of the Selectivity of Methane over Carbon Dioxide Using Composite Inorganic Membranes for Natural Gas Processing
Habiba Shehu, Edidiong Okon, Ifeyinwa Orakwe and Edward Gobina*
Center for Process Integration and Membrane Technology, Robert Gordon University Aberdeen, United Kingdom
- Corresponding Author:
- Edward Gobina
Center for Process Integration and
Membrane Technology, Robert Gordon
University Aberdeen, United Kingdom
E-mail: [email protected]
Received date: April 08, 2016; Accepted date: April 20, 2016; Published date: April 27, 2016
Citation: Shehu H, Okon E, Orakwe I, Gobina E (2016) Study of the Selectivity of Methane over Carbon Dioxide Using Composite Inorganic Membranes for Natural Gas Processing. J Adv Chem Eng 6:150. doi:10.4172/2090-4568.1000150
Copyright: © 2016 Shehu H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Natural gas is an important fuel gas that can be used as a power generation fuel and as a basic raw material in petrochemical industries. Its composition varies extensively from one gas field to another. Despite this variation in the composition from source to source, the major component of natural gas is methane with inert gases and carbon dioxide. Hence, all natural gas must undergo some treatment with about 20% of total reserves requiring extensive treatment before transportation via pipelines. The question is can mesoporous membrane be highly selective for methane and be used for the treatment of natural gas? A methodology based on the use of dip-coated silica and zeolite membrane was developed. A single gas permeation test using a membrane reactor was carried out at a temperature of 293 K and a pressure range of 1 × 10-5 to 1 × 10-4 Pa. The permeance of CH4 was in the range of 1.15 × 10-6 to 2.88 × 10-6 mols-1m-2Pa-1 and a CH4/CO2 selectivity of 1.27 at 293 K and 0.09 MPa was obtained. The pore size of the membrane was evaluated using nitrogen adsorption and was found to be 2.09 nm. The results obtained have shown that it is possible to use a mesoporous membrane to selectively remove carbon dioxide from methane to produce pipeline quality natural gas. There is a need for further study of the transport mechanism of methane through the membrane since this is essential for the separation of other hydrocarbons that could be present as impurities.