6. Technological evolution and economic context
The major recent developments have been in improving yields and increasing unit size: the latter is a step in the direction of greater plant profitability, but it is not without its pernicious effects, which we'll come back to later.
Advances in metallurgy have led to a new generation of tubes, increasing their diameter at furnace outlet, with a number of advantages, including:
Reduced pressure drop and therefore partial pressure of hydrocarbons;
reduction in the number of furnace outlet tubes and quenching boilers;
increased residence time without loss of selectivity ;
doubling of...
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Technological evolution and economic context