Positioning of HPPE production on post-Soviet space by technology development and output

Comparing the Influence of the Manufacturing Process Employed on the Structure and Properties of Low-Density Polyethylene

“…Analysis of the molecular weight characteristics of the polymers (Figure 2, Table 2) shows that in the case of oxygen initiation, the molecular weight distribution [MWD] for the polyethylene is unimodal in nature with a molecular weight [MW] peak in the area of 1.2•10 5 . The polymer has a narrower MWD and lower molecular weights in comparison with equivalents manufactured using other processes, but it is similar to the polymer that used to be manufactured at the OOO Tomskneftekhim with equivalent initiation [1], which suggests that the impact of reactor differences is insignificant. Polyethylene generated using peroxide initiation has a broader MWD, which in terms of the nature of the distribution is identical to mixed initiation, but with lower molecular weight values (without the high-molecular "tails").…”

“…As a result of work carried out to re-engineer production and upgrade the manufacturing process, which was done in cooperation with the OOO TsNIIKA and the OAO Plastpolimer, the OOO Tomskneftekhim is becoming the number one manufacturer of LDPE in Russia, with an achieved annual output of over 240 000 tonnes. The stages of upgrading of the production process are described in detail in work [1]. At present, radical polymerisation of ethylene is done in three-zone tubular reactors using mixed (oxygen and organic peroxides) initiation.…”

Modernization of “Polimir” Process of High-Pressure Polyethylene Production at “Tomskneftekhim” Company

“…Application of mixed initiation at maximal temperatures led to extend of molecular mass distribution. It improved the extrusion process and increased yield of high quality (film grade) product from 50-60 % to 80-90 % [4]. In contrast with oxygen initiation the curves of molecular mass distribution have bimodal character with "high-molecular shoulder" that is caused by the polymer synthesis in the 1 st zone at comparatively low temperatures and medium viscosity [8].…”