PROBLEM 1: In order to save on the energy costs associated with bringing precurs
ID: 2088946 • Letter: P
Question
PROBLEM 1: In order to save on the energy costs associated with bringing precursors to reaction temperature, it is common to use economizers, whereby a hot fluid from another part of the plant is passed through a heat exchanger. Aniline is used in the production of sulfanilic acid, which is used as a precursor for many sulfa drugs, by reacting it with sulfuric acid at 180 C. An engineer, Mr. Brightside, has been assigned the task of building an economizer for this reaction. Opening his eager eyes, he proposes diverting Syltherm 800 from the nearby concentrated solar power plant to a double-pipe, counterflow heat exchanger of length 3m. The initial design consists of a 6" Schedule 40 Duralumin inner pipe to carry the Syltherm, while the outer pipe carrying the aniline is also a similar, 8" Schedule 40 pipe. Eight struts of thickness 1/4" are used to support the inner pipe. With destiny calling him, Mr. Brightside also proposes the use of a 12-fin assembly of thickness 1/8" of the same material mounted to a central pin of diameter 1/2" to provide enhanced heat transfer. The flow rates of the aniline and Syltherm are 30 and 120 gallons per minute, respectively, and the respective entry temperatures are 16 C and 320°C. In order to get permission of the CSP plant, the Syltherm must be returned to their cold holding tank at 232°C. Is this possible? Also, what is the exit temperature of the aniline? Foreach fluid, use the respective inlet temperature values when evaluating properties.Explanation / Answer
1. Metabolism - It is sum total of all chemical reactions that occur in living organisms in order to maintain their living state by converting food (taken) into energy .
3. The ultimate goal of photosynthesis is fixation of carbon-dioxide in the form of sugar like glucose ( reserve food ) .
4. All the reactions of photosynthesis occur in chloroplast (thylakoids) .
5. We ( human ) are dependent on photosynthesis for food . Photosynthesis fix carbon dioxide in the form of reserve food in the presence of sunlight . This food is utilised by human for their survival as they are heterotrophic and can not synthesize their own food .
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