11 Plants and Parts Thereof for Purification of Industrial Waste Gases with Washing Solutions, Comprising Absorbers, Washers, Scrubbers, Filters, Packing Bodies, Ventilators, Fans, Tube Conduits, Armatures and Fittings, Valves, Drop Separators, Mechanical Jetting Devices, Control Consoles with pH Regulators, Washing Tanks, Submersible Pumps, Monitoring and Metering Devices, Grates Made of Steel, Heat Exchangers, Pump Chambers with Level and pH Control, Chemical Dosing Vessels and Liquid Collector Vessels Made of Plastic and Parts Thereof; Devices and Their Parts for Preparation of Waste Water Solutions Comprising Reactor Vessels Made of Plastic and Refined Steel, Heating and Cooling Devices, Stirrers or Agitators, Distillation Columns, Chemical Apparatuses