SEOUL, March 12 (Reuters) - South Korea's Hanwha Chemical 009830.KS picked Credit Suisse CSGN.VX to advise on possible purchases from Dow Chemical's DOW.N chloro-alkali business but its interest is still in the early stages, a Hanwha spokesman said on Wednesday. Dow Chemical said in December it would sell the bulk of its chlorine operations as part of its plan to sell or spin off commodity chemicals assets worth up to $4 billion. ID:nL4N0JH2VI The spokesman for Hanwha said no details had been decided. (Reporting by Joyce Lee; Editing by Paul Tait) ((jungyoon.lee@thomsonreuters.com)(+82 2 3704 5609)(Reuters Messaging: jungyoon.lee.thomsonreuters.com@reuters.net)) Keywords: HANWHA DOWCHEMICAL/SALE