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:
Mar. 06, 2012
Filed:
Jul. 20, 2011
Sung Woo Kang, Daejeon, KR;
Nam Kyu Kim, Daejeon, KR;
Young Jae Jun, Daejeon, KR;
Man Jung Kim, Yeosu-si, KR;
Kil Su Kim, Yeosu-si, KR;
Sung Woo Kang, Daejeon, KR;
Nam Kyu Kim, Daejeon, KR;
Young Jae Jun, Daejeon, KR;
Man Jung Kim, Yeosu-si, KR;
Kil Su Kim, Yeosu-si, KR;
Abstract
A method for preparing polyolefin from alpha-olefin with high productivity using an internal circulating fluidized bed polymerization reactor is disclosed. The method for gas-phase polymerization of alpha-olefin comprising the steps of: supplying circulation gas including one or more alpha-olefins and inert gas into a polymerization reactor; polymerizing the alpha-olefin to polyolefin in two separated polymerization areas in the polymerization reactor; and discharging produced polyolefin from the polymerization reactor. The polymerization reactor is divided into the two polymerization areas by a draft tube, and an inside of the draft tube forms a riser where growing polyolefin polymers move up in fast fluidization, and an outside of the draft tube forms an annulus where the polyolefin polymers passing the riser move down by gravity, and the polyolefin polymers passing the annulus are introduced to a lower part of the riser again, so that the polyolefin polymers are polymerized during circulating between the riser and the annulus.