Catalytic Pyrolysis Process CPP

The Catalytic Pyrolysis Process (CPP), also developed by RIPP of SINOPEC, is an extension of DCC which gives an increased ethylene yield while keeping propylene production at a reasonable rate. The key features of this process are as follows  

Commercial trial runs were successfully completed in early 2001 at the PetroChina Daqing Refining Chemical Co. using a revamped DCC unit with a capacity of 80,000 t/a. Three sets of conditions were employed Mode 1 - for maximum propylene yield Mode 3 - for maximum ethylene yield Mode 2 - intermediate between the two. Feedstock properties, major operating parameters and product distribution can be seen in Tables 10, 11 and 12. Across the three modes, the combined yield of ethylene and propylene ranges between 34 and 38 wt% and the total yield of C2 C4 olefins is around 45 wt% in each case. The ethylene to propylene ratio can be adjusted by variation of the operating conditions. 

Key economic data for a CPP plant with integrated steam cracker are shown in Table 13. Based on 500 KTA of ethylene produced by CPP and 1000 KTA of ethylene produced by steam cracking, the estimated net product revenue is 450 MM/A. 

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Economics ROG streams from FCC units, deep catalytic cracking (DCC) units, catalytic pyrolysis process (CPP) units and coker units are normally used as fuel gas in refineries. However, these streams contain significant amounts of olefins (ethylene and propylene), which can be economically recovered. In fact, many such streams can be recovered with project payout times of less than one year. 

CPP [Catalytic Pyrolysis Process] A Hybrid DCC-steam cracking process, developed by Stone and Webster and piloted in China. 

CPP [Catalytic Pyrolysis Process] A general term for processes that convert biomass to useful products by heating in the absence of air. 

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