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This issue of the Review includes a thorough evaluation of state-of-the-art commercial technology, plant operations and design, and innovative research and development work for light olefins production technologies.

This section of the Review contains comprehensive analysis of refinery light olefins technology associated with the FCCU, and also, information of "on-purpose" light olefin production technologies: cracking of heavier olefins, metathesis, propane and butane dehydrogenation, and methanol-to-olefins. The processes will help to meet increasing demand for propylene and other light olefins in the future as petrochemical producers look for alternative to conventional steam cracking.

Refiners are primarily concerned with propylene production as a byproduct of FCC processing coupled with highly efficient recovery techniques. Alternative production techniques, however, are also important to refiners as feedstock supply and product recovery can be implemented in a highly-integrated configuration to improve production margins and overall plant profitability. Overall, the factors influencing light olefins production and the influence on refiners is highly regional specific due to differing refinery configurations, regional supply and demand trends, and the presence and/or viability of alternative production technologies

Additionally, increasing worldwide attention on industrial CO₂ emissions in relation to global warming may support investment in alternative production technologies, as an estimated 180-200MM mt/y of CO₂ are released in association with ethylene and propylene production throughout the world. Many of the on-purpose technologies claim gains in energy efficiency and improvements in emissions performance over existing thermal cracking, FCC, and cryogenic recovery technologies.

Worldwide propylene capacity for 2010 was estimated at 96.8MM mt/y. The Asia-Pacific region is credited with the largest portion of this total producing 24.269MM mt/y or 32.4% of the world's annual output. One estimate pegged the contribution of steam cracking to worldwide propylene supply at 61% in 2008, while petroleum refineries contributed 34% and on-purpose propylene plants accounted for only ~3% of capacity. Other estimates stated that on-purpose propylene production technologies accounted for ~5% of worldwide propylene production in 2007, and this number is expected to balloon to 12% by 2015

More detailed information regarding light olefins production in terms of supply and demand, capacity additions, and technology competition/development are discussed as part of the Market/Technology Trends and Opportunities section in this issue of the Review. Also, in the light olefins production section, new processes, catalysts, and topics covered include:

 
• Axens's Riser Separation System used for high-severity FCC operations;
• KBR's Advanced Catalytic Olefins process;
• INDMAX FCC technology offered by Lummus Technology and Indian Oil Corp.;
• Shell's dual-riser MILOS process;
• Updated process descriptions and commercial data on Sinopec's DCC, FDFCC, CGP, MIP-CGP, and MIO processes
• Sinopec's CPP and UOP's PetroFCC for petrochemical production;
• Updated FCC additive offerings from Albemarle, BASF, JGC C&C, Grace Davison, IMP, IOC, and Sinopec;
• Integral catalyst systems for enhanced propylene production from Albemarle, BASF, and Grace Davison;
• Propane-propylene splitter technologies offered by Shaw and UOP;
• Offgas olefins recovery techniques form AET, Air Products and Chemicals, Costain Oil, Gas & Process, and Linde BOC Process Plants;
• Snamprogetti and Uhde's butenes recovery technology;
• Superflex technology offered by KBR;
• Lummus Technology's OCT for propylene via metathesis;
• Updated commercial experience regarding PDH projects and technologies from Linde/BASF, Lummus Technology, Snamprogetti/Yarsintez, Uhde, and UOP;
• Novel MTO processes licensed by Lummus Technology/SYN and Sinopec; and
• A discussion of the latest patents and research papers regarding refinery and on-purpose light olefins production related to process configurations, new equipments, catalyst/additive innovations, and integrated operations.

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