Abstract: A catalyst for removing olefins from aromatic compounds or mixtures of aromatic compounds wherein the catalyst is a naturally acidic smectite clay containing exchangeable cations wherein the naturally acidic smectite clay has a cation exchange capacity of 40 to 80 meq./100 g. and wherein the exchangeable cations include 5 to 70 meq./100 g. of Al.sup.3+ cations, a process for the preparation of this catalyst including treating a naturally acidic smectite clay with an aluminum salt solution wherein the salt solution includes Al.sup.3+ ions at a concentration of at least 10 meq./100 g. of the catalyst, and a process for the removal of olefins from aromatic compounds or mixtures of aromatic compounds using the above-described catalyst.

Abstract: A catalyst is described on the basis of acid-activated smectitic clay minerals for removing olefins from aromatic compounds or mixtures of aromatic compounds which is characterized in that the acid-activated clay mineral contains at least 5 milli-equivalents/100 g of exchangeable Al.sup.3+ cations.

Abstract: Disclosed are dispersions of fluorescent whitening agents which are suitable for the fluorescent whitening of coating compositions for coating paper or of fibre dispersions (paper pulps) in paper production.

Abstract: An iodine adsorption agent is described, containing silver or a silver salt on a porous, temperature-resistant and acid-resistant organic carrier with an average pore diameter in the range from 6 to 200 nm. It has a pore diameter distribution in which 80% of the pore volume is contained in pores whose diameters lie within the range of .+-.50% about the average pore diameter.