Wuhuan Engineering Co., Ltd., formerly the 4th Design Institute of Ministry of Chemical Industry， was founded in 1958, and is now a wholly-owned subsidiary of China National Chemical Engineering Group Corporation under direct charge of State-owned Assets Supervision and Administration Commission of the State Council and is also a key science-and-technology enterprise in chemical industry.   Wuhuan Engineering Co., Ltd. is an international engineering company capable of EPC contracting and management of construction projects. The company, one of the first engineering companies to be given Class AAA credit rating, has Class A qualification certificates in engineering design, engineering consultation, project supervision, project price consultation and environmental impact assessment for construction projects and it has the qualification to conduct engineering consultation, engineering design and project contracting for international projects. Over the past 5 decades, Wuhuan Engineering Co., Ltd. has made significant contribution to the development and prosperity of chemical industry in China, and made a series of achievements in the field of engineering science and technology. It accomplished the design of more than 1700 large and medium-sized projects and EPC of over 60 projects both home and abroad, with businesses covering 31 provinces and municipalities in China and over 20 countries and regions around the globe.