Abstract: Simulated moving bed processes for the separation of C.sub.8 aromatic isomers using molecular sieve adsorbents are improved by the use of meta-diisopropylbenzene as the eluting agent. The invention describes a process for continuously separating, in a liquid phase, components of the feed mixture by contacting said feed mixture with a solid sorbent and utilizing a simulated countercurrent flow system wherein a liquid stream flows through serially and circularly interconnected desorption, rectification and sorption zones.

Abstract: Novel oligomerization catalysts comprising cobalt oxide on carbon in admixture with certain other catalyst supports, such as refractory oxides, i.e. alumina, silica alumina and molecular sieves and the like are herein disclosed. The preparation of said novel catalysts is likewise disclosed and the use of said catalysts in propylene oligomerization reactions is hereby described and claimed. The novel oligomerization catalysts are produced by: (a) impregnating activated carbon with a solution containing a cobalt amine complex; (b) treating the impregnated activated carbon at elevated temperatures in order to decompose the cobalt salt to cobalt oxide; and (c) thereafter admixing the so-formed cobalt oxide on carbon with a catalyst support material such as bauxite.

Abstract: In a liquid chromatography commercial process for the separation of two or more components contained in admixture in a feedstream including the steps of (a) contacting the feedstream mixture containing the components to be separated with a bed of crystalline aluminosilicate adsorbent at conditions to effect the selective retention of two or more of the components by said adsorbent, (b) passing through said bed an eluent selected from the group consisting of aromatics and substituted aromatics, (c) increasing the strength of the eluting agent in the liquid carrier during the operation of the steps (a) and (b) above, (d) recovering from said bed a stream or streams containing at least a portion of the less selectively adsorbed components, and (e) recovering a stream substantially enhanced in concentration of said selectively adsorbed components relative to other components of feedstream wherein the improvement comprises preheating the eluting agent of step (c) above prior to passing it through said bed at tempe