Aimed at overcoming significant costs and technical barriers prohibitive to the extensive use of conventional gas-to-liquid (GTL) processes for the exploitation of small and/or isolated natural gas reservoirs, the next-generation GTL technologies presented in this text reduce the expenses associated with air fractioning and syngas production. Showcasing contributions from the partners of two cooperating European research projects, namely the OCMOL and NEXT-GTL, this book offers a concise treatment of innovative GTL technologies based on recent advances in catalytic membrane systems, reaction engineering, and process design.