Abstract: A device for cleaning gases includes a housing and a plurality of electrostatic filter units. Each of the filter units have a tube-shaped covering, and the housing has an intake opening at one end and an outlet opening at the other end for gas flow. The filter units have an essentially airtight arrangement within the housing. The filter units combine to form a filter assembly arranged inside the housing such that the assembly can be inserted and removed from the housing in one piece.

Abstract: An air cleaning apparatus provides a housing with a column shape and an air cleaning unit within a portion of the housing, the cleaning unit having a complementary shape. The air inlet and outlet nozzles to the housing are provided at a top and bottom face, with the inlet and outlet openings to the air cleaning unit corresponding with the housing nozzle inlets and outlets locations. However, the air cleaning unit inlet and outlet openings are displaced from the nozzle inlets and outlets.

Abstract: In a process for preparing terpene esters by reaction of camphene and a low molecular weight carboxylic acid over an acid ion exchanger as catalyst, the reactants are passed from below through the acid ion exchanger located in a column-shaped reactor at such a velocity that the ion exchanger is suspended to uniformly fill the reactor, i.e. gives a pseudofluid suspended bed. In the case of the preparation of isobornyl acetate, a high specific catalyst productivity, a high selectivity of the reaction with formation of small amounts of other esters, a high degree of conversion of the reaction component used in substoichiometric amount and a high total catalyst productivity are achieved.