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

(12) PATENT APPLICATION PUBLICATION (21) Application No.6488/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 FOR CONTINUAL PREPARATION OF POLYCRYSTALLINE SILICON USING A
FLUIDIZED BED REACTOR"
(51) International classification :C30B 29/06 (71)Name of Applicant :
(31) Priority Document No :10-2006-0053826 1)KOREA RESEARCH INSTITUTE OF CHEMICAL
(32) Priority Date :15/06/2006 TECHNOLOGY
(33) Name of priority country :Republic of Korea Address of Applicant :100 JANG-DONG,YUSEONG-GU,
(86) International Application No :PCT/KR2007/002880 DAEJEON 305-343, REPUBLIC OF KOREA Republic of Korea
Filing Date
:14/06/2007 (72)Name of Inventor :
(87) International Publication No :WO 2007/145474 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 :
There is provided a method for continual preparation of granular polycrystalline silicon using a fluidized bed reactor, enabling a
stable, long-term operation of the reactor by effective removal of silicon deposit accumulated on the inner wall of the reactor tube. The
method comprises (i) a silicon particle preparation step, wherein silicon deposition occurs on the surface of the silicon particles, while
silicon deposit is accumulated on the inner wall of the reactor tube encompassing the reaction zone; (ii) a silicon particle partial
discharging step, wherein a part of the silicon particles remaining inside the reactor tube is discharged out of the fluidized bed reactor
so that the height of the bed of the silicon particles does not exceed the height of the reaction gas outlet; and (iii) a silicon deposit
removal step, wherein the silicon deposit is removed by supplying an etching gas into the reaction zone.
No. of Pages : 79 No. of Claims : 19
The Patent Office Journal 24/10/2008 25952