A self-propelled agricultural harvesting machine such as a forage harvester includes a front harvesting attachment for picking up crop from a field as well as one or more working mechanisms for processing and conveying the crop. The device has a pivotable insertion drum arranged in a rotatable manner around its axis with at least one oblong insertion chamber for inserting the piece of food. The control member adapted to complete an engine circuit when in the activated position. A document from the symbol data and the comment data in the current source file is formed. An improved process and apparatus for dialkyl carbonate synthesis reduce corrosion by physically removing or chemically decomposing the alkyl chloroformate impurities within the corrosion-resistant upstream sections of the apparatus.