Method and system for producing benzene

A method for the manufacture of benzene comprising:

• a) forming a first feedstock mixture comprising alkylated aromatics and hydrogen;
• b) hydrodealkylating the first feedstock mixture to partially convert the alkylated aromatics with the hydrogen to benzene and obtain a first product mixture comprising benzene, unconverted alkylated aromatics, alkanes with one to three carbon atoms formed in the conversion of the alkylated aromatics to benzene, and unconverted hydrogen;
• c) separating at least a part of the alkanes with one to three carbon atoms and at least part of the hydrogen from the first product mixture to obtain a light-gas fraction;
• d) steam cracking a second feedstock mixture to form a steam cracking product mixture;
• e) subjecting the second product mixture to separation of a first pyrolysis gasoline fraction, sour gas removal, compression, drying and precooling steps;
• f) providing at least a part of the light-gas fraction and at least part of the steam cracking product mixture resulting from step e) to a cryogenic separation,
• wherein the cryogenic separation comprises forming a hydrogen fraction, a fraction predominantly or exclusively containing hydrocarbons with two carbon atoms, and a second pyrolysis gasoline fraction;
• and
• wherein the hydrogen fraction formed in the cryogenic separation comprises at least 75% by volume of hydrogen;
• and
• g) providing the hydrogen fraction to the first feedstock mixture as at least part of the hydrogen contained in the first feedstock mixture.