1-octene is an important linear olefin, often used as a polyethylene comonomer and as a raw material for the production of plasticizers, surfactants and synthetic lubricants. 1-octene is used as a comonomer to produce polyethylene with excellent performance and high added value.

The linear low-density polyethylene ((LLDPE) produced by 1-octene copolymerization has high melt strength, good tensile properties, impact resistance and environmental stress cracking resistance, and can significantly improve the mechanical processing performance of polyethylene. The characteristics of heat resistance, flexibility and transparency. In terms of improving the tear strength and breaking strength of LLDPE, 1-octene is also significantly better than other a-olefins.

In addition, 1-octene is also used to produce high- and medium-density polyethylene pipes, and 1-octene copolymerized polyethylene pipes have better toughness and better creep resistance.

At present, most of the polyethylene copolymer products in my country are 1-butene copolymers. In recent years, Qilu, Tianjin, Maoming and other petrochemical companies have successively launched 1-hexene copolymer products, but the copolymers of ethylene and 1-octene are only Fushun Produced by Petrochemical and Tianjin Petrochemical. The domestic development and industrialization of 1-octene monomer should be accelerated to realize the localization of 1-octene as soon as possible.

In recent years, after Sinopec successfully produced hexene monomers, Tianjin Ethylene Plant successfully developed 6010 LLDPE products, which became Dow’s 8 carbon (octene copolymer) product 2045G in the market competition, Qilu Company developed The metallocene hexene copolymer product grade is the special PERT material of QHM22F/QHM32F. I believe that with the efforts of technicians, octene copolymer polyethylene products will bloom everywhere in domestic petrochemical plants.

Production process of ethylene-octene copolymer

At present, the production of LLDPE/HDPE resin in the world usually adopts gas phase method and slurry method. Due to the high boiling point of 1-octene, ethylene/1-octene copolymer products are mainly produced by solution method. A small amount of gas phase method and slurry method have been improved and optimized to produce ethylene/1-octene copolymer polyethylene products.

In the solution process, DOW Chemical Company uses 1-octene as a comonomer in the low pressure solution process, and NOVA Chemical Company also uses 1-octene in the medium pressure solution process.

●The Dowlex process adopts two series reactors to produce Z-N catalyst polyethylene; adopts Insite technology to produce metallocene polyethylene and elastomers.

●The Sclairtech solution production technology of NOVA Chem was developed by Dupont, Canada, and was later purchased by NOVA. The process uses butene and 1-octene as comonomers and a single titanium-based Z-N catalyst to produce resins with narrow molecular weight distribution and wide molecular weight distribution.

●The Compact Solution process developed by the Dutch DSM company uses advanced ZN catalysts, which can produce PE with a density of 0. 900 ~ 0. 970g/cm3. The operating temperature of the Compact process is lower than that of the Dowlex or Sclairtech process, and the reaction feed needs to be frozen. . Later, the US Exxon Company and DSM Company reached an agreement to adopt the Compact process and use the Exxpol metallocene catalyst developed by Exxon Company to produce metallocene ethylene/1-octene copolymer resin with a density of 0.880 ~ 0.915g/cm3.

●ChevronPhillips' Phillips slurry process reactor consists of continuous loops (4, 6 or 8 legs) arranged in the form. The loop reactor specially designed by Phillips uses chromium catalysts, metallocene catalysts and Z-N catalysts to produce full-density polyethylene products. The polyethylene MFR range produced by this process is 0.15 ~ 100g/10min, and the density is 0.936 ~ 0.972g/cm3. In recent years, the Phillips process has been greatly developed. On the basis of the original, it continues to innovate the loop tube process, and develops a number of new grades of HDPE and MDPE for the copolymerization of ethylene and 1-octene for rotational molding.

 Ethylene/1-octene copolymer polyethylene products are highly recognized by the market due to their unique high performance and high added value. The new copolymer polyethylene products developed by DOW Chemical, NOVA and ChevronPhillips Chemicals Main grade.