Mixed-matrix membranes are identified as a new type of membranes being more efficient due to the inorganic particles in their structure. In industry they can be a good substitute for old methods which consume a lot of energy. Thus, the present research scrutinizes different filling particles used in this group of membranes, applications, shortcomings and the challenges of producing these types of membranes. This book explains the key parameters in the fabrication methods through blending of polymeric and non-polymeric materials containing different components in their chemical structures. It is a complete overview of all relevant and similar references in the field of membrane technology in oil, gas and petrochemicals, by considering standards and the way of performing separation techniques and implementing projects.