Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Organic polymerization
Patent
1980-12-02
1982-03-16
Marcus, Michael S.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Organic polymerization
422137, 422187, 422234, C08F 202, C08F 1002, B01J 1202
Patent
active
043200885
ABSTRACT:
A process and apparatus for widening the molecular distribution of ethylene polymers produced at high pressure and at high temperature by polymerizing ethylene at a pressure between 600 and 3,000 bars and at a temperature between 160.degree. C. and 320.degree. C., in two reactors operating in parallel. In the first reactor, the reaction takes place in the presence of less than 0.1% of hydrogen for the purpose of producing a polymer of high molecular weight. In the second reactor, the reaction takes place in the presence of 0.2 to 5% of hydrogen for the purpose of fabricating a polymer of low molecular weight. The effluents from these two reactors are expanded and then moved to a set of two separators interconnected so as to efficiently mix the polymers produced in the two reactors by recycling the least possible amount of hydrogen into the supply circuit of the first reactor in such manner that the proportion of hydrogen in the first reactor remains less than 0.1% in moles. Ethylene polymers are produced with a fluidity index between 0.1 and 2 and a polydispersity index larger than 8.
REFERENCES:
patent: 3649208 (1972-03-01), Hornschuch
patent: 3914342 (1975-10-01), Mitchell
patent: 3969470 (1976-07-01), Spiegelman
patent: 4105842 (1978-08-01), Nicco et al.
patent: 4168356 (1979-09-01), Levresse et al.
Marcus Michael S.
Societe Chimique des Charbonnages--CdF Chimie
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