Engineering

Recovery of CS₂

The technology behind the condensation of carbon disulfide from highly concentrated waste gas streams represents the most efficient and at the same time the most economic variant for the recovery of CS₂.

The process

In the process specially developed for applications in the viscose industry, a mixture of steam, CS₂ and air, with a temperature of around 95°C, is sucked off from the fleece forming unit (CS₂ box). Most of the vapor is condensed in the vapor condenser by mixing with warm water.

The actual condensation of CS₂ takes place in the water jet apparatus which is loaded with chill water. The gaseous phase is then separated from the liquid phase by means of an air separator. The gaseous phase contains air and all the non-condensed gases whereas the liquid phase consists of process water and condensed CS₂. As a result of the higher density of CS₂ compared to water, the carbon disulfide precipitates in the settler and can be directly led back to viscose fi ber production. The overfl ow (water) from the settler is cooled and then led to the circuit water system of the water jet apparatus.