Shandong Qingyun Changxin Chemical Science-tech Co.,Ltd. was registered on June 6th 2009. It is large scale chemical industry enterprise which is professional in the production of N-methyl pyrrolidone(NMP), γ-butyrolactone(GBL) product. The enterprise adheres to precision management, keep improving, quality first and customers satisfactory as the management principle. It has passed ISO9001: 2008 Quality management system certification and SGS international Authorities Structure Test. Location...