The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 2012
Filed:
Aug. 29, 2008
Benoit Koch, Hennut, BE;
Daniel Marissal, Carry le Rouet, FR;
Marc Parisel, Vilvoorde, BE;
Brent R Walworth, Sint-Niklaas, BE;
Benoit Koch, Hennut, BE;
Daniel Marissal, Carry le Rouet, FR;
Marc Parisel, Vilvoorde, BE;
Brent R Walworth, Sint-Niklaas, BE;
Ineos Manufacturing Belgium NV, Antwerpen, BE;
Abstract
Process for producing a multimodal polyethylene in at least two reactors connected in series, in which 20-80 wt % of a first polymer is made in suspension in a first reactor and 80-20 wt % of a second polymer is made in suspension in a second reactor in the presence of the first polymer, and a stream or slurry containing the resulting polymer is withdrawn from the second reactor and transferred to a flash tank operating at a pressure and temperature such that at least 50 mol % of the liquid component of the slurry, or the non-polymer component of the stream entering the flash tank, is withdrawn from the flash tank as a vapour, wherein the concentration in the stream or slurry entering the flash tank of components having a molecular weight below 50 g/mol, C(mol %), satisfies the equation C<7+0.07(40−T)+4.4(P−0.8)−7(C/C) where Tand Pare respectively the temperature (in ° C.) and pressure (MPa g) at the location where the vapour withdrawn from the flash tank is condensed, and Cand Care the molar concentrations in the flash tank of hydrogen and ethylene respectively.