PROCESS AND APPARATUS FOR HEATING HYDROCARBONS TO FORM HOT HYDROCARBON REACTION PRODUCTS IN PETROLEUM AND CHEMICAL PROCESSES

摘要

A process for heating a hydrocarbon feed stream adapted to be employed in a petroleum or chemical process of the and such as herein described to form hot hydrocarbon reaction products which comprises a first phase of contacting and hydrocarbons with heated combustion gas in substantially back mixed flow condition such as herein defined and a second phase thereafter of contacting said hydrocarbons with said combustion gas in substantially plug-flow condition such as herein defined to achieve a declining temperature profile in the heated hydrocarbon stream as it passes from said first phase to said second phase.