... service of special sulfuric acid and coal gas chemical equipment; manufacturing and after-sale service of A2 grade pressure ... Key Project3+2 Double-Converse Double-Absorption, Thermal Recovery, Re-Use Of Waste HeatDesign, Manufacture, Debugging & Start-UpSinopec ... Key Project3+2 Double-Converse Double-Absorption, Thermal Recovery, Re-Use Of Waste HeatDesign, Manufacture, Debugging & Start-UpTongliao ...