US   olefins  producer  Dow  Chemical  began  restart  procedures  Tuesday   on  its   Light 

Hydrocarbons Unit 9 at its Freeport, Texas, site after completing maintenance, the company 

said in a regulatory filing. The emissions event associated with the restart is scheduled to ru

n through December 18, according to the filing with the Texas Commission on Environmental 

Quality. 

The 1.5 million mt/year steam cracker went down December 4 while work was carried out on 

an exchanger, according to a previous filing. 

The  newbuild  steam  cracker, along with  a 400,000 mt/year polyethylene plant, first began 

production in September.