Mitsui CX process

Continuous stirred-tank reactors (CSTRs) are used for large productions of a reduced number of polymer grades. Coordination catalysts are used in the production of LLDPE by solution polymerization (Dowlex, DSM Compact process [29]), of HDPE in slurry (Mitsui CX-process [30]) and of polypropylene in stirred bed gas phase reactors (BP process [22], Novolen process [31]). LDPE and ethylene-vinyl acetate copolymers (EVA) are produced by free-radical polymerization in bulk in a continuous autoclave reactor [30]. A substantial fraction of the SBR used for tires is produced by coagulating the SBR latex produced by emulsion polymerization in a battery of about 10 CSTRs in series [32]. The CSTRs are characterized by a broad residence time distribution, which affects to product properties. For example, latexes with narrow particle size distribution cannot be produced in CSTRs. 

Dowlex DSM Compact process Mitsui CX-process Novolen process Innovene process (horizontal stirred bed reactor)... 

The Mitsui CX process is typical of a modem slurry process for HDPE production (Figure 2.37). It consists of two CSTRs (hexane is used as diluent), a centrifuge to separate the diluent from the polymer, a dryer to remove the residual diluent, and a diluent recovery system to separate the low molecular weight polymer or wax that is dissolved in the diluent. The two polymerization reactors can be operated in series or in parallel. When run in... 

CP [Continuous polymerization] A continuous process for making high-density polyethylene, based on the Ziegler process but using a much more active catalyst so that de-ashing (catalyst removal) is not required. Developed by Mitsui Petrochemical Industries and upgraded into its CX process, which was first licensed in 1976. 

Mitsui Chemicals, Inc. Polyethylene Ethylene/comonomers CX process yields bimodal-molecular weight polymers 40 2001... 

Mitsui Chemicals, Inc. Polyethylene, HDPE Ethylene and comonomer To produce high-density polyethylene (HDPE) and medium-density polyethylene (MDPE) under low-pressure slurry process—"CX process" 46 NA... 

Mitsui Chemicals Inc. CX process, low-pressure slurry process, total capacity 3.6 MMT/y. HDPE to MDPE (density 930-970 kg/m ), MFI = 0.01 to >50 g/10 min MWD from narrow to very large, controlled. 

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