Abstract: A visual indicating paste composition for producing a detectable color change upon contact with an aqueous solution comprising an indicator dye capable of changing color in the pH range between about 7 and about 11, an inorganic base in the form of a caustic powder dispersed in a liquid carrier capable of absorbing water which is not rapidly leached by water or hydrocarbon, and a minor amount of a boron-containing compound, is provided. When applied to a measuring probe, the paste composition is particularly adapted for detecting the water level in the bottom of tanks and delivery systems containing gasoline, and especially gasoline containing oxygenated blending components, by producing a clear detectable color change without bleeding or run-off upon contact with an aqueous solution. The paste composition exhibits long shelf life and improved water tolerance.

Abstract: A visual indicating paste composition for producing a detectable color change upon contact with an aqueous solution comprising an indicator dye capable of changing color in the pH range between about 7 and about 11, said base being dispersed in a liquid carrier capable of absorbing water but which is not rapidly leached by water or hydrocarbon, is provided. When applied to a measuring probe, the paste composition is particularly adapted for detecting the water level in the bottom of tanks and delivery systems containing gasoline, and especially gasoline containing oxygenated blending components, by producing a clear detectable color change without bleeding or run-off upon contact with an aqueous solution.

Abstract: A visual indicating paste composition for producing a detectable color change upon contact with an aqueous solution comprising an indicator dye capable of changing color in the pH range between about 7 and about 11, an inorganic base in the form of a caustic powder dispersed in a liquid carrier capable of absorbing water which is not rapidly leached by water or hydrocarbon, and a minor amount of a boron-containing compound, is provided. When applied to a measuring probe, the paste composition is particularly adapted for detecting the water level in the bottom of tanks and delivery systems containing gasoline, and especially gasoline containing oxygenated blending components, by producing a clear detectable color change without bleeding or run-off upon contact with an aqueous solution. The paste composition exhibits long shelf life and improved water tolerance.

Abstract: Purification of acetophenone containing difficultly separable impurities by extractive distillation with a solvent selected from the group consisting of oligomers of 1,2-glycols, said oligomers having from 4 to 9 carbon atoms per molecule.

Abstract: In the process of producing a diisocyanate comprising(a) condensing and rearranging alkyl phenylcarbamate and formaldehyde under acidic conditions to form dialkyl methylene bis(phenylcarbamate) and(b) thermally decomposing the dialkyl methylene bis(phenylcarbamate) to diphenylmethane diisocyanate,the improvement comprises prior to step (b) treating the reaction product of (a) by first distilling the reaction product of (a) under reduced pressure at a temperature below 120.degree. C. until all solvent is removed and 65-85% of the unreacted alkyl phenylcarbamate present is removed, discontinuing the distillation, adding a polar solvent to undistilled distillation residue and selectively crystallizing and separating dialkyl methylene bis(phenylcarbamate) from the distillation residue.

Abstract: A mixed C.sub.4 hydrocarbon stream containing from 5 to 60% isobutene is mixed with methanol providing from about 2% to about 20% excess methanol (stoichiometry based on isobutene content) to provide fresh feed for preparing tertiary butyl methyl ether in a reaction zone containing acidic ion exchange catalyst. Formation of trouble-some amounts of diisobutylene is repressed by the presence of the excess methanol. The effluent comprising TBME, excess methanol, and unreacted C.sub.4 hydrocarbons is directed to a unique purification zone. The butenes are distilled from the effluent at a pressure from about 7 to 25 atmospheres, preferably at about 12 to 20 atmospheres. Surprisingly all of the excess methanol is azeotropically removed with the C.sub.4 hydrocarbons by the pressurized azeotropic distillation, leaving a bottoms consisting of a technical grade of TBME free from troublesome amounts of methanol.