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Subject: An Engineer Makes Chocolate Chip Cookies
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An engineering friend of mine sent me his recipe for Chocolate Chip Cookies. Let's give it a try.
To a 2-liter jacketed round reactor vessel (reactor #1) with an overall heat transfer coefficient of about 100 Btu/F-ft2-hr, add ingredients one, two and three with constant agitation. In a second 2-l reactor vessel with a radial flow impeller operating at 100 rpm, add ingredients four, five, six, and seven until the mixture is homogenous. To reactor #2, add ingredient eight, followed by three equal volumes of the homogenous mixture in reactor #1. Afterward, add ingredients nine and ten slowly, with constant agitation. WARNING: Care must be taken at this point in the reaction to control any temperature rise that may be the result of an exothermic reaction involving the product mixture. Using a #4 nodulizer, place the mixture in a series of approximately equal apportionments on a 316SS sheet (300 x 600 mm), spacing the nodules on 54.5mm (8mm) centers. Heat in a 769K oven for a period of time that is in agreement with Frank & Johnston's first order rate expression (see JACOS, 21, 55), or until golden brown (albedo 7.9 1 on the Ractageno scale). Once the reaction is complete, place the sheet on a 25C heat-transfer table, allowing the product to come to equilibrium before dispensing.
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