Deep Catalytic Cracking DCC

Feedstock A wide range of heavy oils A wide range of heavy oils preferably parafTmics 

Catalyst Various types of Y zeolite A modified pentasil structure zeolite 

Main fractionator Base Higher vapor/liquid ratio 

The experience accumulated over eight years in four refineries and one petrochemical complex has shown that light olefin yields are greatly dependent on the feedstock properties as detailed in Table 8. Daqing paraffinic feedstock gives the highest propylene and isobutylene 5delds, with 23.0 wt% and 6.9 wt% respectively. For intermediate base feeds, propylene yield is more than 18 wt% for DCC-I and 14.4 wt% for DCC-II operation with an FCC naphtha yield near 40 wt%. 

Feedstock Paraffinic Intermediate Arabian HVGO+ Intermediate base  

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Item Deep Catalytic Cracking (DCC) Fluidized Catalytic Cracking (FCC) Steam Cracking (SC)... 

Deep catalytic cracking (DCC) is a catalytic cracking process which selectively cracks a wide variety of feedstocks into light olefins. The reactor and the regenerator systems are similar to FCC. However, innovation in the catalyst development, severity, and process variable selection enables DCC to produce more olefins than FCC. In this mode of operation, propylene plus ethylene yields could reach over 25%. In addition, a high yield of amylenes (C5 olefins) is possible. Figure 3-7 shows the DCC process and Table 3-10 compares olefins produced from DCC and FCC processes. ... 

Deep catalytic cracking (DCC) is a commercially proven FCC process for selectively cracking a wide variety of feedstocks to light olefins, particularly propylene. Innovations in catalyst development, operational severity, and anticoking conditions. 

Application To selectively convert vacuum gas oils and the resulting blends of each into C2-C5 olefins, aromatic-rich, high-octane gasoline and distillate using deep catalytic cracking (DCC) methods. 

Stone Webster Eng., Corp. Olefins, light Naphtha, VGO, resld Deep catalytic cracking (DCC) process to make light olefins, C2-C5 7 2000... 

In the past few years workers at Sinopec have been prominent in developing FCC operations which target propylene as a major product. The increased propylene yield is a function of catalyst developments and increasing the cracking temperature. This variation is known as Deep Catalytic Cracking (DCC) and there are two main variants. Table 10.3 illustrates typical yields that can be achieved . 

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. 

China Petrochemical Technology Co., Ltd. Propylene or Iso-olefln Vacuum gasoil (VGO), vacuum resid orVGO blended with deasphalted oil Deep catalytic cracking (DCC) conversion technology, produces light olefins (ethylene, propylene and butylenes), LPG, gasoline, middle distillates, etc., from hydrocarbon feedstocks NA NA... 

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