The by-product C_4 hydrocarbon resource from ethylene plant and comprehensive utilization of C_4 hydrocarbon in foreign countries is introduced.

Production technology of propylene from C_4 olefin by disproportionation;

Advances in catalytic cracking butane for production of light olefins;

Review of C8 aromatics separation technologies;

Advances in process research on coal or natural gas to light olefins via methanol;

Single-tube scaleup tests on direct conversion of syngas to light olefinsⅡ. Studies of catalyst properties;

Single tube scaleup tests on direct conversion of syngas to light olefins Ⅲ. studies of regenerated catalyst properties;