Abstract: An air-texturized dubbing yarn is provided for use in tying the body portion of a fly fishing fly. The dubbing yarn is formed in an air texturizing machine and includes a core thread and one or more effect threads that are air-entangled through and frayed about the core thread to present a fuzzy texture. The colors of the threads are selected to form a combined color scheme that mimics the natural colors of live flies. A method of tying a fly includes attaching one end of a length of air-texturized yarn to the shank of a hook and wrapping the yarn about the shank to form a fly body mimicking that of a live fly. Hackle and other materials may then be added to complete the fly.

Abstract: A method for separating a noble metal catalyst from a crude reaction product of a noble metal-catalyzed hydroformylation reaction which comprises: (a) contacting the crude reaction product under perstraction conditions with a membrane capable of allowing a substantial portion of unreacted olefin feed and hydroformylation reaction product to pass therethrough as permeate while retaining a substantial portion of the catalyst as retentate; (b) removing the permeate by sweeping it away from the membrane by means of a sweep stream which is the same as the olefin feed used in the hydroformylation reaction; and (c) retaining the catalyst as retentate.

Abstract: A system for producing phthalic anhydride by vapor phase oxidation of orthoxylene, naphthalene or the like which comprises an oxidation section, and a finishing section comprising: a means for decomposing crude phthalic anhydride liquid such that water, various other by-products and small amounts of phthalic anhydride are removed from the crude phthalic anhydride liquid as decomposer vapor; a means for venting decomposer vapor directly to a top portion of a first fractionation column; the first fractionation column being capable of distilling crude phthalic anhydride liquid received from the decomposer means for the purpose of removing light ends therefrom and which is also capable of recovering phthalic anhydride contained within vapors being vented therefrom; and a second fractionation column capable of distilling the crude phthalic anhydride liquid from the first fractionation column and removing tailings therefrom to produce substantially pure phthalic anhydride; whereby phthalic anhydride is recovered fr