Process for producing light olefins and aromatics

A process for producing light olefins and aromatics comprising the steps of:

• (1) reacting a feedstock with hydrogen and a hydrotreating catalyst under the conditions of a hydrogen partial pressure between about 3.0 MPa and 20.0 MPa, a reaction temperature between about 300° C. and 450° C., a hydrogen/oil volume ratio between about 300-2000, and a liquid hourly space velocity (LHSV) between about 0.1 h−1-3.0 h−1, and separating a reaction effluent to obtain H2, CH4, hydrotreated C20-C40, hydrotreated naphtha, and hydrotreated product, wherein the H2 reaction effluent is reused for reaction with the feedstock;
• (2) catalytically cracking the hydrotreated product in a catalytic cracking reactor under conditions of a reaction temperature between about 400° C. and 800° C. and a weight hourly space velocity (WHSV) between about 0.1 h−1 and 750 h−1, separating spent catalyst from the reaction product vapor, and stripping and regenerating the spent catalyst for reuse, separating a reaction product vapor to obtain H2, CH4, catalytic cracking C2=-C3=, catalytic cracking C20-C30, catalytic cracking C4-C5, catalytic cracking naphtha, LCO, and heavy cycle oil (HCO), wherein the C4-C5 are cycled into the catalytic cracking reactor;
• (3) reacting the hydrotreated C20-C40 and hydrogenated naphtha of step (1) and catalytic cracking C20-C30 of step (2) with steam under a temperature between about 700° C.-1000° C. to produce another reaction product that is then separated to obtain H2, CH4, steam cracking C2=-C3=, steam cracking C20-C30, steam cracking C4-C5, steam cracking naphtha, and fuel oil, wherein the steam cracking C4-C5 are cycled to the catalytic cracking reactor;
• (4) selectively hydrogenating the catalytic cracking naphtha of step (2) and steam cracking naphtha of step (3) to produce a solvent product, and extracting the solvent product to obtain aromatics and extraction raffinate, cycling the extraction raffinate back to step (3) as another feedstock for steam cracking.

An apparatus for producing light olefins and aromatics, comprising:

• a hydrotreating unit for reacting a feedstock and hydrogen with a hydrotreating catalyst to obtain H2, CH4, hydrotreated C20-C40, hydrotreated naphtha, and hydrotreated product;
• a catalytic cracking unit having a catalyst for catalytically cracking the hydrotreated product under conditions of a reaction temperature between about 400° C. and 800° C. and a weight hourly space velocity (WHSV) between about 0.1 h−1 and 750 h−1 to produce a reaction product vapor comprising H2/CH4,l catalytic cracking C2=-C3=, catalytic cracking C20-C30, catalytic cracking C4-C5, catalytic cracking naphtha, LCO, and HCO;
• a steam cracking unit for reacting the hydrotreated C20-C40, hydrotreated naphtha, and catalytic cracking C20-C30 with steam under a temperature between about 700° C. and 1000° C. and to produce a reaction product vapor comprising H2/CH4, steam cracking C2=-C3=, steam cracking C20-C30, steam cracking C4-C5, steam cracking naphtha;
• selective hydrogenation unit for selectively hydrogenating catalytic cracking naphtha and the steam cracking naphtha to obtain a selectively hydrogenated naphtha;
• a solvent extraction unit for extracting aromatics and extraction raffinate from the selectively hydrogenated naphtha.