Minimising Waste Gas Emissions from Batch-Operated Production Plant in the Chemical Industry. In fulfilling legal obligations to limit waste gas emissions, the strategy of avoidance and reduction has to take precendence over waste gas cleaning. Fundamental disadvantages and limited possibilities of waste gas cleaning systems create a necessity to minimize waste gas emissions by substitution of process materials, or by better encapsulation of process systems. Reduction of process gas emissions is shown by the examples of gas feedback, avoidance of gas pressure cushions, and encapsulating of stirring systems as well as centrifuges. The problem of diffuse emissions from gaskets in separatable connections and from fitting casings is discussed. An example of chemical reaction in a strictly closed system is given. With regard to the reduction of exhaust volumes from open sources, bulk materials feed and sampling are discussed; centrifuges, pressure filters and continuous belt filters are shown as examples of closed systems in solid-liquid-separation.