In February 2021, Chongqing Bozhang and Chongqing xinshengtong Chemical Co., Ltd. signed the contract of "9600 T / a 32% - 90% potash concentration unit". The unit will provide technical support for xinshengtong's "7000 tons of hexanediol and 1000 tons of alkyne glycol comprehensive project" after it is put into operation. It is one of the major new infrastructure projects of xinshengtong in 2021. The completion of the project will further promote the process of comprehensive utilization of energy in Chongqing Chemical Industry and contribute to the optimization of industrial structure adjustment in Chongqing. "9600 T / a 32% - 90% potash concentration unit" is very difficult to tackle technical problems, and the raw material composition involved is very complex, including toluene, alkyne diol, etc. (2,5-dimethyl-3-hexyne-2,5-diol), which is very difficult to implement. It is necessary to fully consider the gasification critical points of toluene, alkynylenediol and other components as well as the characteristics of flammable and explosive substances, determine the gasification gradient and the evacuation mode of gasification substances in the evaporation equipment, so as to meet the process requirements of recrystallization of non condensable gas components. After several technical discussions, the feasibility of negative pressure evaporation process was finally confirmed. The construction of "9600 T / a 32% - 90% potash concentration plant" puts forward higher requirements for Bozhang's process technology application in the field of alkali concentration and evaporation, and provides a new direction for Bozhang's technology extension in the alkali recovery and comprehensive utilization plate. Deep emission reduction, comprehensive recycling of resources and building a green industrial system are of great significance to the sustainable development of industry, and they are also important driving forces for technological innovation and green manufacturing, which requires every enterprise to contribute.