1930 - 1939 The Sower
In 1931 the production program is expanded by constructing an acetic anhydride production plant, which manufactures this substance from acetic acid, according to own methods. Anhydride is needed for producing acetate rayon.
A new large scale workshop is built in the same year.
A pipeline for acetaldehyde is built connecting the works and the harbor site in Wesseling on the Rhine and an aldehyde tank farm for transporting aldehyde in tanker-barges is also constructed.
Knapsack introduces granulated calcium cyanamide to the market for the first time.
The dedication of an own apprentice workshop in the newly constructed main workshop takes place on 1 December 1935.
A plant is commissioned in 1936 that attains acetic acid and acetic anhydride from acetaldehyde in a one step process.
Knapsack builds a partially enclosed carbide furnace that enables the partial recovery and utilization of the byproduct carbon monoxide. The works have over 2,000 staff members.