Abstract: <SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: "Times New Roman"; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">New evaporation energy saving technologies,such as multi-effect falling film vacuum evaporation and steam-jetting heat pump,were adopted in order to treat and recycle the mother solution,which contained ammonium chloride and sodium chloride,generated in production of sodium bicarbonate by double decomposition method.New technologies overcame the problems of serious equipment corrosion and high energy consumption during recovery of ammonium chloride and sodium chloride by thermal process and made a breakthrough for thermal process.In addition,they had been applied successfully in practical production,and achieved the purpose of energy-saving and environmental-protection.These technologies are also applicable to the treatment of other solutions containing ammonium chloride and sodium chloride.</SPAN><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"></SPAN>