US 2023/0312434 A1 · PROCESS FOR OBTAINING AROMATICS AND AROMATIC STREAM

Abstract

The present invention addresses to a process for the production of aromatic compounds from streams containing linear chains with 5 to 18 carbon atoms, of fossil or renewable origin, and application in the field of catalytic cracking aiming at a regenerator operation at much lower temperature, between 480° C. and 620° C., preferably the temperature should be between 500° C. and 600° C. The coked catalyst generated by the cracking of light streams with low potential for delta coke generation can have the combustion effected at a lower temperature. The regeneration temperature must be at least 40° C. and at most 100° C. higher than the reaction temperature, keeping the catalyst circulation high to maintain the energy balance in the reaction section. The minimum regeneration temperature can be ensured by installing an air preheating furnace before entering the regenerator and passing through the air distributor inside the regenerator. The used catalyst must contain zeolite with pores of intermediate size. Such conditions greatly favor the production of aromatics and the octane rating of the produced naphtha.

Claims16

Dependent claims

1-A PROCESS FOR OBTAINING AROMATICS from streams with linear chains with 5 to 18 carbon atoms, characterized in that it comprises the following steps:

a) introducing the preheated feed stream (2) into a fluid catalytic cracking reactor (5) so that it comes into contact with an intermediate pore zeolite catalyst (3) from a regenerator (12), from the which a mixture between gaseous cracking products and coke-deactivated catalyst (6) is obtained;
b) separating from said mixture the cracking products and the coke-deactivated catalyst (6);
c) subjecting the coke-deactivated catalyst (6), separated in the previous step, to a rectification step (10) with water vapor (9) for removing light hydrocarbons (8);
d) subjecting the rectified catalyst (11) in the previous step to a regeneration step (12) and combusting the coke deposited on the catalyst particles, in which the combustion temperature does not exceed 600° C., in order to obtain catalyst particles with activity higher than that of the spent catalyst;
e) allocating the regenerated catalyst with restored activity back to the reactor (5) in order to continue the catalytic cracking process;
f) allocating the hydrocarbon streams (7) obtained in the catalytic cracking reactor to a fractionation section in order to separate the produced hydrocarbons according to their boiling points;
wherein the catalyst regeneration temperature is at least 40° C. and at most 100° C. higher than the reaction temperature.

4 more elements

Process for obtaining aromatics and aromatic stream

Life of this patent

Process for obtaining aromatics and aromatic stream

Life of this patent

Abstract

Claims16