continued from part 1 - Controller General of Patents, Designs, and ...

(12) PATENT APPLICATION PUBLICATION (21) Application No.6492/DELNP/2008 A
(19) INDIA
(22) Date of filing of Application :24/07/2008 (43) Publication Date : 24/10/2008
(54) Title of the invention : "METHOD AND APPARATUS FOR PREPARATION OF GRANULAR POLYSILICON"
(51) International classification :C30B 29/06 (71)Name of Applicant :
(31) Priority Document No :10-2006-0075897 1)KOREA RESEARCH INSTITUTE OF CHEMICAL
(32) Priority Date :10/08/2006
TECHNOLOGY
(33) Name of priority country :Republic of Korea Address of Applicant :100 JANG-DONG, YUSEONG-GU,
(86) International Application No :PCT/KR2007/0003827 DAEJEON 305-343, REPUBLIC OF KOREA Republic of Korea
Filing Date
:09/08/2007
(72)Name of Inventor :
(87) International Publication No :WO 2008/018760 1)KIM HEE YOUNG
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
2)YOON KYUNG KOO
3)PARK YONG KI
4)CHOI WON CHOON
(62) Divisional to Application Number :NA
Filing Date
:NA
(57) Abstract :
A process for preparing granular polysilicon using a fluidized bed reactor is disclosed. The upper and lower spaces of the bed are
defined as a reaction zone and a heating zone, respectively, with the height of the reaction gas outlet being selected as the reference
height. The invention maximizes the reactor productivity by sufficiently providing the heat required and stably maintaining the
reaction temperature in the reaction zone, without impairing the mechanical stability of the fluidized bed reactor. This is achieved
through electrical resistance heating in the heating zone where an internal heater is installed in a space in between the reaction gas
supplying means and the inner wall of the reactor tube, thereby heating the fluidizing gas and the silicon particles in the heating zone.
The heat generated in the heating zone is transferred to the reaction zone by supplying the fluidizing gas at such a rate that the silicon
particles can be intermixed between the reaction zone and the heating zone in a continuous, fluidized state.
No. of Pages : 81 No. of Claims : 56
The Patent Office Journal 24/10/2008 25969