Process for preparing a halogenated polymer and device for its implementation
AssigneeSolvay (Societe Anonyme)
InventorsJean-Marie Blaude, Roland Martin
Life of this patent
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Abstract
A process for preparing a halogenated polymer in a medium comprising liquid or supercritical carbon dioxide, comprising a step involving the radical polymerization of at least one halogenated monomer and at least one step involving cross-flow filtration; and a cross-flow filtration device.
Claims18
A process for preparing a halogenated polymer in a polymerization medium comprising liquid or supercritical carbon dioxide, said process comprising the radical polymerization of at least one halogenated monomer and cross-flow filtration of a suspension of halogenated polymer particles in a fluid phase comprising liquid or supercritical carbon dioxide, wherein the suspension of polymer particles in a fluid phase is withdrawn from the polymerization medium (suspension A) and subjected to cross flow filtration in order to obtain a concentrated suspension (suspension B), and wherein said process further comprises at least one of a), b), and c) as follows:
- a) prior to concentration by cross flow filtration, suspension A is cooled in a heat exchanger;
- b) purification of concentrated suspension B by cross-flow filtration;
- c) suspension A is concentrated by a method not involving cross-flow filtration prior to being subjected to cross flow filtration in order to obtain suspension B.
A process for preparing a halogenated polymer in a polymerization medium comprising liquid or supercritical carbon dioxide, said process comprising the radical polymerization of at least one halogenated monomer and cross-flow filtration of a suspension of halogenated polymer particles in a fluid phase comprising liquid or supercritical carbon dioxide, wherein cross-flow filtration is conducted in a device comprising at least one filter tube housed in an outer jacket, the filter tube and the outer jacket being kept a fixed distance from each other by two parts which are located at their ends and to which they are fixed.
Dependencies are inferred from the claim text.