Guoyuan Securities has gained approval to take over the Shenzhen-listed Beijing Huaer, effectively allowing it to go public through a backdoor listing, the China Securities Journal reported. Huaer is 58% controlled by Beijing Eastern Petrochemical Co, a privately held unit of China Petroleum & Chemical Group (Sinopec), Asia's top refiner. Huaer is to sell all its assets and liabilities to its main shareholder ...