a process and a device are described for producing high purity and high temperature steam from non - pure water which may be used in a variety of industrial processes that involve high temperature heat applications . the process and device may be used with technologies that generate steam using a variety of heat sources , such as , for example industrial furnaces , petrochemical plants , and emissions from incinerators . of particular interest is the application in a thermochemical hydrogen production cycle such as the cu — cl cycle . non - pure water is used as the feedstock in the thermochemical hydrogen production cycle , with no need to adopt additional and conventional water pre - treatment and purification processes . the non - pure water may be selected from brackish water , saline water , seawater , used water , effluent treated water , tailings water , and other forms of water that is generally believed to be unusable as a direct feedstock of industrial processes . the direct usage of this water can significantly reduce water supply costs .