Sclairtech process

Products SCLAIRTECH process can produce PE products with density range of 0.905-0.965 kg/m3, melt index (Ml) from 0.2 to in excess of 150, and narrow to broad molecular weight distribution (MWD). This allows producers to participate in the majority of the polyethylene market segments including among low-, medium- and high-density films, rotational, injection and blow molding applications. 

The Dowlex process by Dow Chemicals is the dominant process in solution polymerization, but Dow does not license this technology to other companies (Figure 2.39). The Dowlex process uses two CSTRs in series with a high boiling hydrocarbon solvent. Other competing processes include the DSM process and the Sclairtech process by Nova Chemicals. In some configurations, these processes may also have tubular reactors operated in series with the CSTR to complete monomer conversion. 

The Advanced SCLAIRTECH process uses two CSTR with CHX as a solvent and metallocene catalyst at T = 160-220 °C and P = 3-34 MPa. Process advantage is the heat recovery. The patent for the first time uses the homogeneity index, HI calculated from Tk,... 

The solution process is less generic. The companies having a strong technology foothold in the solution process technology include Mitsui, Nova Chemicals (Sclairtech process), Dow and DSM (Stamicarbon Compact process). Differences in process set-up and operating conditions are considered as proprietary information. 

As of 2009, Nova had a worldwide annual capacity of approximately 5.4 billion poxmds manufactured with the Sclairtech process. Key features of this process are relatively small, 2800-9000 liter, reactors that result in... 

Sclair A process for polymerizing ethylene. Depending on the co-monomer used, the product can be linear low-density polyethylene (LLDPE) or high-density polyethylene (HDPE). Developed by DuPont in 1960 and widely licensed. Engineered by Uhde under the name Sclairtech. Nova Chemicals (Alberta) acquired the technology in 1994. 

Sclairtech An advanced version of the Sclair ethylene polymerization process, using a Ziegler-Natta catalyst and multiple reactors. Announced in 1996. The first commercial plant will be built in Alberta by Amoco Canada and Nova, and is scheduled for completion in 2000. 

NOVA Chemicals (International) S.A. Polyethylene Ethylene and comonomer SCLAIRTECH technology process produces the full range of linear polyethylene (PE) products, including linear-low-density, medium-density and high-density grades with narrow to broad molecular weight distribution 12 2010... 

The work on Z-N-type catalysts in DuPont Canada in Kingston resulted in a low-pressure solution technology, SCLAIRTECH , based on a new coordination catalyst (Elston 1972, filed 1968). The process made it possible to copolymerize C2 with 10-20 mol% of C4, Ce, or Cg olefins. The SCLAIRTECH provides greater variety of PE properties than the standard Z-N-type process, ranging from HOPE to that of LLDPE. The density and crystallinity depend on the type, amount, and sequence of placement of a comonomer. Owing to excellent performance parameters, these resins are used for films and fibers as well as for gas pipelines. A full-scale production facility near Sarnia, ON, was built in the early 1960s (Lank and Williams 1982). 

Nova Chemicals/200P SURPASS Advanced Sclairtech Solution Process (either single- or multi-solution reactors) Film, Injection and Rotomolding Grades... 

The Sclairtech technology also offers lower cost ethylene as an ethylene feed stream of 85% ethylene and 15% ethane maybe used in the process. The cost savings comes from lower ethylene purification requirements in the ethylene plant. 

AST [Advanced Sclair Technology] The latest version of an ethylene polymerization process developed by DuPont and acquired by NOVA Chemicals. See also Sclair, Sclairtech. 

DuPont Canada Ltd., Sclairtech Solution Process (53A/3/1), Plastics and Rubber Institute—Polyethylene The 1990s and Beyond, London (May 1992). 

---