Deep catalytic cracking unit

An improved FCC unit is the deep catalytic cracking unit (DCC) that is designed to produce gasoline from vacuum gas oil (VGO). The... 

DCC [Deep catalytic cracking] A general term for processes which convert heavy petroleum feedstocks and residues to hght hydrocarbons. One such process, for making C3-C5 olefins, was developed by the Research Institute of Petroleum Processing, China, and licensed through Stone Webster. Five units were operating in China in 1997. 

Deep Catalytic Cracking. This process is a variation of fluid catalytic cracking. It uses heavy petroleum fractions, such as heavy vacuum gas oil, to produce propylene- and butylene-rich gaseous products and an aromatic-rich liquid product. The liquid product contains predominandy benzene, toluene, and xylene (see BTX processing). This process is being developed by SINOPEC in China (42,73). SINOPEC is currendy converting one of its fluid catalytic units into a demonstration unit with a capacity of 60,000 t/yr of vacuum gas oil feedstock. 

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. 

Prime-G, Prime-G+ A deep hydrodesulfurizing process for removing sulfur compounds prior to fluid catalytic cracking. It uses a fixed catalyst bed and conventional distillation. Developed by IFP (now Axens) from 1999. The + version is an improvement on the original process. In 2001, over 60 units had been licensed and 11 were operating commercially. First commercialized at Gelsenkirchen, Germany, in 2001. By 2012,140... 

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