Abstract: This invention relates to an improved process for providing water repellency and stain resistance to a masonry surface wherein an aqueous based water repellant polymeric coating is applied thereto and the water removed leaving a water repellent polymeric film adhered to the masonry surface. The improvement in the process resides in the use of an aqueous emulsion of a semi-crystalline ethylene-vinyl acetate polymer formed by emulsion polymerization wherein the polymer has: (a) a crystalline melting point ranging from 35 to 110° C. measured at a heat rate of 20° C. per minute; and, (b) a tensile storage modulus of at least 1×105 dynes/cm2 at a temperature of 115° C. and measured at 6.28 rad/sec.

Abstract: The atomization of a fluid injected into an atomization zone is enhanced by providing the fluid with an effective amount of an additive capable of reducing the static and dynamic interfacial tension of the fluid components.

Abstract: A process for selectively producing C3 olefins from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is introduced into a process unit comprised of a reaction zone, a stripping zone containing a dense phase, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream is contacted in the reaction zone with a catalyst containing from about 10 to about 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions. Vapor products are collected overhead and the catalyst particles are passed through the stripping zone on the way to the catalyst regeneration zone. Volatiles are stripped with steam in the stripping zone and the catalyst particles are sent to the catalyst regeneration zone where coke is burned from the catalyst, and are then recycled to the reaction zone.