Abstract: Apparatus for liquid/solid contact including apparatus for single or multiple fluidized beds provided with one or more trays having a number of inverted frustum-shaped depressions with an opening located therein.

Abstract: Exhaust or waste gas containing nitrogen oxides is contacted with an aqueous solution containing urea and a catalytic amount of bromine or/and chlorine ion.

Abstract: A process for preparing catalysts for hydrodesulfurization which have fine pores sharply distributed in the range of 50 to 200A by the steps of adding a molybdate to a water soluble aluminum complex represented by the general formula Al.sub.n (OH).sub.m X.sub.3n.sub.-m, wherein 1< n< 100, 3n> m; n/(3n-m) .ltoreq. 16 and X is a univalent anion, to obtain a uniform solution composition, treating the same hydrothermally, then adding, if required by the desired catalyst composition, a molybdenum or tungsten compound; adding one or more cobalt or nickel compounds; further adding and mixing one or more members selected from polyhydric alcohols, high-molecular organic substances and amine group substances and then treating the mixture in usual ways such as drying, calcinating, grinding, moisture adjusting, molding, roasting and the like.

Abstract: High grade cokes are produced by a simple expedient such that a raw material oil is charged into a coking drum and is subjected therein to a two step operation, namely reforming of the oil and subsequent coking under bubbling into the oil of a heated non-oxidizing gas. No fluidized bed of the oil to be coked is formed.

Abstract: A process for preparing catalysts for hydrodesulfurization which have fine pores sharply distributed in the range of 50 to 200A by the steps of adding a molybdate to a water soluble aluminum complex represented by the general formula Al.sub.n (OH).sub.m X.sub.3n.sub.-m (wherein n>1, 3n>m and X is an anion) to obtain a uniform solution composition, treating the same hydrothermally, then adding a member selected from the group consisting of molybdenum and tungsten compounds and one or more members selected from the group consisting of iron, cobalt and nickel compounds, further adding and mixing with one or more members selected from the group consisting of polyvalent higher alcohols, high-molecular organic substances and amine group substances and then treating the mixture in such usual ways as drying, calcinating, grinding, moisture adjusting, molding, roasting and the like.