Advances of two-stage riser catalytic cracking of heavy oil for maximizing propylene yield (TMP) process.

Yang Chaohe,Chen Xiaobo,Li Chunyi,Zhang Jinhong,Shan Honghong

doi:10.1007/s13203-014-0086-6

Abstract

Two-stage riser catalytic cracking of heavy oil for maximizing propylene yield (TMP) process proposed by State Key Laboratory of Heavy oil Processing, China University of Petroleum, can remarkably enhance the propylene yield and minimize the dry gas and coke yields, and obtain high-quality light oils (gasoline and diesel). It has been commercialized since 2006. Up to now, three TMP commercial units have been put into production and other four commercial units are under design and construction. The commercial data showed that taking paraffinic based Daqing (China) atmospheric residue as the feedstock, the propylene yield reached 20.31 wt%, the liquid products yield (the total yield of liquefied petroleum gas, gasoline, and diesel) was 82.66 wt%, and the total yield of dry gas and coke was 14.28 wt%. Moreover, the research octane number of gasoline could be up to 96.

Highlights

As the development of economy, the demand for propylene and ethylene is growing rapidly
Two-stage riser catalytic cracking of heavy oil for maximizing propylene yield (TMP) process proposed by State Key Laboratory of Heavy oil Processing, China University of Petroleum, can remarkably enhance the propylene yield and minimize the dry gas and coke yields, and obtain high-quality light oils
Three TMP commercial units have been put into production and other four commercial units are under design and construction

Summary

Introduction

As the development of economy, the demand for propylene and ethylene is growing rapidly. The TMP process optimizes two riser reactors to gain the flexibility of operation; develops a proprietary catalyst with low hydrogen transfer activity and high cracking activity; combines stratified injections of light and heavy feedstocks and specially designed reactors to obtain high catalyst to oil ratio (C/O ratio) and low reaction temperature in riser exits. The increased catalyst density in the novel reactor can enhance the catalytic cracking of C4 and light naphtha, and help to reduce the dry gas and coke yields. The TMP process can enhance the propylene yield and restrain the dry gas and coke yields

Experimental study of TMP process

Findings

Conclusion