Shanghai Zhang Nan Chemical Co. Ltd. is a global trading company our headquarters is one of China's gas cylinders and 1000-30000 cubic meters per hour of air separation gas. At present, with the production of 1.8million bottles of acetylene gas, 50,000 bottles of high purity gas, 20,000bottles of mixed gas and other large natural gas production capacity of 2 million bottles,with 16 on-site air separation production line. Subordinate gas companies, dangerous goods transport companies,dangerous goods storage companies and other 15 enterprises.