Abstract: A process for dyeing carpets composed of nylon fibers coated with stain blocker whereby any loss of stain resistance occurring during processing of the fibers is recovered. The process comprises adding a small amount of stain blocker to the dye liquor used in dyeing the carpets.

Abstract: Deep-dyeing conjugate filaments are melt-spun by merging molten sub-streams of incompatible polymers to form combined streams, then quenching the combined streams to form the conjugate filaments. The filaments are preferably cold drawn prior to winding, increasing the bulk level in a fabric containing the filaments and increasing the dye stability of the filaments. When the sub-streams are merged outside of the spinneret, the filaments split into the sub-filaments upon exposure to boiling water while under no tension. When the sub-streams merge within the spinneret, the filament is not readily split into sub-filaments, but forms a helically crimped filament.

Abstract: Solids losses and particulate catalyst losses in fluidized bed catalytic reactors using cyclone means to retain catalyst are significantly reduced by the presence of particulate inert fines.

Abstract: Treatment of dicyanobutene to inactivate residual dimerization catalyst facilitates hydrogenation of the product to form adiponitrile.

Abstract: Acrylonitrile dimerization is improved by increasing the proportions of catalyst used in the reaction mixture.

Abstract: Wet pulverulent materials are loaded into shipping containers around generally vertical, elongated spacers which create elongated cavities, and thereafter unloaded by showering a solvent through the cavities.

Abstract: An improved partially-oriented nylon 66 (PON) spinning process and product are provided by increasing the molecular weight well above the levels customary for apparel end uses.

Abstract: A polyamide (preferably nylon 66) partially oriented feed yarn contains a small amount of branching agent and has an elongation between 45 and 150%. The feed yarn can be textured by the friction twist process to yield a textured yarn having crimp development similar to yarn textured by the much more expensive pin twist method.

Abstract: An improved partially-oriented nylon 66 (PON) spinning process and product are provided by increasing the molecular weight well above the levels customary for apparel end uses.

Abstract: Acrylonitrile is catalytically dimerized in the presence of an organic phosphorus (III) catalyst, an inert hydrocarbon reaction solvent and a non-interfering proton-donating solvent; and the dimerized product separated from the catalyst by extraction. In the extraction the dimerized product is preferably dissolved in an extraction solvent and removed from the catalyst phase preparation. In the instant invention, the extraction solvent is an amide, preferably formamide. The extraction solvent and proton-donating solvent may be identical.

Abstract: The dicarbonylation product of 1,4-disubstituted-2-butene is useful as intermediate in the production of adipic acid, hexamethylenediamine and 1,6-hexanediol. It is produced by carbonylating a solution of the disubstituted butene in a polar, aprotic non-basic solvent at 80.degree.-140.degree. C. in the presence of a catalyst comprised of a halide of the transition metal. The dicarbonylation product is converted to adipic acid by hydrogenation followed by hydrolysis.

Abstract: A dicarboxylic acid is separated from the product stream in the form of wet crystals, shipped to a different location in a shipping container, and unloaded from the shipping container by dissolving the dicarboxylic acid in salt solution.

Abstract: The dicarbonylation product of 1,4-dialkoxy substituted-2-butene is useful as intermediate in the production of adipic acid, hexamethylenediamine and 1,6-hexanediol. It is produced by carbonylating a solution of the dialkoxy substituted butene in a polar, aprotic non-basic solvent at 80.degree.-140.degree. C. in the presence of a catalyst comprising a halide of the transition metal.

Abstract: A polyester yarn having filaments with aperiodic varying shrinkage levels along their lengths, the filaments having within-filament and between-filament shrinkage C.V.'s of at least 10%. The yarn may be made by conventional melt spinning within a critical narrow range of spinning speeds wherein yarn shrinkage decreases rapidly with spinning speed. A greige fabric incorporating the yarn as filling is textured by shrinking the unrestrained fabric, then heating the fabric sufficiently to cause the yarn to elongate.

Abstract: In a partially oriented nylon feed yarn for drawtexturing, the filaments have sheaths containing a branching agent while the cores do not. Exceptional crimp development is achieved in the resulting textured yarn.

Abstract: There is disclosed a process for the ammoxidation of hydrocarbons to unsaturated nitriles using a fluidized bed containing a mixture of active catalyst and discrete particles of an inert material to improve the yield of nitriles and inhibit the formation of by-products.

Abstract: A fluid distribution system for a vessel comprises a fluid supply main conduit and a plurality of parallel co-planar branch pipes, the branch pipes having terminal orifices equidistantly spaced from the inner wall of the vessel by about half the distance between consecutive adjacent orifices along each branch pipe.

Abstract: Dimethyl adipate is produced from dimethyl hex-3-enedioate which is prepared by carbonylation of butadiene under reactive conditions in the presence of an alcohol, a platinum-group-metal catalyst and quinone oxidant.

Abstract: A method for the preparation of catalysts useful for the oxidation and ammoxidation of olefins contain antimony, uranium, iron, bismuth, and molybdenum in a catalytically active oxidized state. The method comprises preparing a hydrated mixed oxide component containing antimony, uranium iron and bismuth, making an aqueous slurry thereof; adding a molybdate thereto; adjusting the pH, drying and calcining. The catalysts are especially useful for the production of acrylonitrile from propylene, ammonia, and an oxygen-containing gas.

Abstract: An improved partially-oriented nylon 66 (PON) spinning process and product are provided by increasing the molecular weight well above the levels customary for apparel end uses.