PropyleneMAX™ Catalytic Cracking (PMcc™)
Grace and Technip Stone & Webster Process Technology, Inc. (TechnipFMC) are jointly developing an improved catalyst and process designed to provide pathways to convert crude oil to petrochemical feedstocks.
PropyleneMAX™ catalytic cracking technology (PMcc™) is a high-severity fluid catalytic cracking process licensed by TechnipFMC and designed to produce high yields of propylene and other petrochemical feedstocks such as ethylene and butylenes. With this new collaboration, refiners will benefit from the combination of Grace's knowledge as the leading supplier of FCC catalysts and light-olefins additives, and TechnipFMC's expertise in high propylene catalytic cracking process technology, resid processing, and mechanical know-how as we design a high propylene cracking process with a specialized catalyst system to produce world class propylene yields.
THE PMCC™ PROCESS
While the PMcc flow scheme and operation are like conventional Fluid Catalytic Cracking (FCC) or Residue Fluid Catalytic Cracking (RFCC) units, there are key design features that help to produce higher yields of petrochemicals:
Higher residence time to convert naphtha to propylene
Potential to recycle C4's, LCN and Oligomer recycle to maximize propylene
Leading light olefin catalyst
Dual zeolite functionality from USY and pentasil zeolites
Integral metals traps as required
Low slurry yield via high diffusivity alumina
Industry-leading coke selectivity
Single or two-stage regeneration depending on feedstock
Reliable proprietary components
The PMcc produces significantly more light olefins and increases octane level of naphtha. The increased yields are accompanied by reductions in the naphtha, Light Cycle Oil and Decant Oil production, thereby providing deeper level of conversion of feedstock through the PMcc process.
The typical product yields (wt% fresh feed) are:
KEY PROPRIETARY COMPONENTS IN THE PMCC™ PROCESS
Our proven Feed Injection Technology to provide effective atomization and vaporization
Riser Termination Device to maximize light olefins yields
High efficiency packed stripping technology to maximize product recovery at high catalyst circulation rates
Specially designed combustion air and catalyst distributors
Reliable catalyst cooler, if required
Using key design features, proprietary components described above and our experience in design of RFCC units, PMcc offers the following advantages in operation, maintenance and installed cost:
Excellent feedstock conversion efficiency to propylene, ethylene and other valuable petrochemicals
Low delta coke design to maximize conversion and minimize coke make
Robust, proven mechanical design with high reliability and low maintenance costs
Flexibility of performance over a wide range of feedstocks and operating modes
Inherent process safety design
Ease of normal operation, startup and shutdown
Stable and maintainable operation
High energy efficiency
INTEGRATION OF PMCC™ WITH A PETROCHEMICAL COMPLEX
Including a PMcc in a refinery integrated with a petrochemicals complex offers several advantages. PMcc or high propylene FCC can be designed to be a bridge between the refinery and a petrochemical complex. The integrated complex consisting of a steam cracker for ethylene production and PMcc for propylene production can provide the maximum yields of premium value petrochemicals utilizing the lowest cost feedstocks at reduced capital and operating costs. Integration provides streamlined handling of both FCC dry gas, C3/C4 streams and naphtha. As a leading licensor of the steam cracking process, TechnipFCM has leveraged this know-how to offer an integrated refinery and petrochemical complex design that meets flexibility and operating requirements.