Introduction to Petroleum Chemicals. Based on Lectures Given by H. Steiner

By H. Steiner

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G. In some cases steam of this quality may be at a premium and it may then be priced at too high a level to make it suitable for cold production. g. u. For compression refrigerating cycles, especially for high capacities, centrifugal compressors have begun to replace reciprocating machines. Electric drive is generally avoided because of the diflSculty of speed control to allow for variable plant throughput. Steam or gas turbines or the corresponding reciprocating engines offer considerable advantages.

Raising the temperature shifts the equilibrium towards the ethylene side, hence alcohol formation is favoured by lower operating temperatures. If the pressure is raised the formation of one mole of alcohol from two moles of reactants is favoured, but the cost of equipment increases greatly with increased operating pressure. The molar ratio of water to ethylene can vary considerably but as the water/ ethylene ratio increases so does the cost of heating and cooling the excess water. Very high ratios of water to ethylene can, however, give conversions of up to 20 per cent but they are not economically attractive.

G. In some cases steam of this quality may be at a premium and it may then be priced at too high a level to make it suitable for cold production. g. u. For compression refrigerating cycles, especially for high capacities, centrifugal compressors have begun to replace reciprocating machines. Electric drive is generally avoided because of the diflSculty of speed control to allow for variable plant throughput. Steam or gas turbines or the corresponding reciprocating engines offer considerable advantages.

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