| 主权项 |
1. A process for the production of a high octane number gasoline cut starting from a light naphtha feed, comprising the following series of steps:
a)—a first step for separation by distillation carried out in a deisopentanizer [2], which can be used to separate hydrocarbons containing 5 carbon atoms from heavier compounds (i.e. iC5 or iC5+nC5, depending on the case), b)—a section [1] for catalytic isomerization of the heavy effluents (102) obtained from the first separation step, followed by a stabilization [7] of the isomerized effluent (103), which consists of separating out the compounds which are lighter than the pentanes, c)—a second step for separation by distillation, carried out using a deisohexanizer [12] consisting of a separation column in which the overhead products (106) and the bottom products (107) are the desired products from the process, and in which an intermediate cut which is enriched in n-hexane, removed as a side stream (108), is recycled to the catalytic isomerization section [1], d)—a step for transferring heat between the two separation steps, namely the condenser of the deisohexanizer [12] and the reboiler of the deisopentanizer [2], carried out using an exchanger [13] in order to condense all or a portion of the overhead vapours from the deisohexanizer [12] by reboiling all or a portion of the bottom of the deisopentanizer column [2] and using for this purpose a means which depends on the operating pressure of the deisohexanizer [12]. |
