Hengli, China's silk-to-petrochemicals empire, faces the chill of US sanctions
By Colleen Howe and Chen Aizhu BEIJING/SINGAPORE, May 22 (Reuters) - The Hengli Group, built by a husband and wife duo over three decades from a bankrupt textile mill into a Fortune Global 500 giant and one of China's largest private oil refiners, has been thrust into the centre of a geopolitical