Radiation-induced polymerization of ethylene in a pilot plant. I. Bulk process. [. gamma. -rays]

Journal Article · Wed Aug 01 04:00:00 EDT 1979 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1979.070240320· OSTI ID:6012259

Takehisa, M; Machi, S; Watanabe, H

Radiation-induced bulk polymerization of ethylene was carried out with use of a pilot plant with a 10 liter reactor at pressures of 225 to 400 kg/cm/sup 2/, temperatures of 30 to 95/sup 0/C, ethylene feed rates of 5 to 28 kg/hr, and dose rate of 3.8 x 10/sup 5/ rad/hr. Characteristics of the process are mild polymerization conditions and capability of producing medium density polyethylene in powder form. The space-time yield and molecular weight of polymer were in the range of 3.5 to 13.1 g/liter hr and 2.2 x 10/sup 4/ to 14 x 10/sup 4/, respectively. The space-time yield increased with mean residence time and 2.4 powders of pressure, and decreased with temperature. Molecular weight changed similarly with the reaction conditions. These results were consistent with those of the bench plant experiment and the scale effect was small. Polymer deposit to the reactor wall limited a period of continuous operation of the plant. The amount of deposited polymer was increased with the square of reaction time. The rate of polymer deposit was proportional to polymer concentration and to the cube of pressure. The polymer deposit cannot be solved in the bulk process. 9 figures, 1 table.

• Research Organization: Japan Atomic Energy Research Inst., Takasaki
• OSTI ID: 6012259
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 24:3; ISSN JAPNA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKENES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
DEPOSITS
DOSE RATES
ELECTROMAGNETIC RADIATION
ETHYLENE
FLOW RATE
FUNCTIONAL MODELS
GAMMA RADIATION
HIGH PRESSURE
HYDROCARBONS
IONIZING RADIATIONS
KINETICS
MEDIUM TEMPERATURE
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PILOT PLANTS
POLYETHYLENES
POLYMERIZATION
POLYMERS
POLYOLEFINS
POWDERS
PRESSURE DEPENDENCE
QUANTITY RATIO
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
REACTION KINETICS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
YIELDS