Integrated processes and systems for producing para-xylenes

An integrated process for producing para-xylenes, the process comprising:

• catalytically reforming a naphtha feed stream to form a reformate stream;
• separating the reformate stream into a C1-C7 hydrocarbon stream and a C8+ hydrocarbon stream;
• exposing the C1-C7 hydrocarbon stream to a first solvent in a solvent extraction unit to form a non-aromatic hydrocarbon stream and an aromatics stream;
• separating the aromatics stream into a benzene stream and a toluene stream;
• methylating the benzene stream in the presence of a methylation catalyst to form additional toluene stream;
• combining the toluene stream and the additional toluene stream to form a toluene-rich transalkylation feed stream;
• separating the C8+ hydrocarbon stream into a C9+ hydrocarbon stream and a xylene stream comprising ortho-xylene, meta-xylene, and para-xylene;
• separating the xylene stream into a para-xylene stream and a xylene isomer stream comprising ortho-xylene and meta-xylene;
• isomerizing the xylene isomer stream with a isomerization catalyst to produce a para-xylene rich stream;
• dealkylating the C9+ hydrocarbon stream in an dealkylation unit with a dealkylation catalyst, thereby forming a dealkylated product stream;
• separating the dealkylation product stream into an additional aromatics stream, an additional xylene stream, and a tri-methyl benzene rich stream;
• and
• upgrading the toluene-rich transalkylation feed stream and the tri-methyl benzene rich stream in a transalkylation unit with a hydrogen stream and a transalkylation catalyst to produce an alkyl-benzene stream and additional amounts of non-aromatic hydrocarbon stream, aromatics stream, and xylene stream, and wherein:
• a ratio by weight of the toluene-rich transalkylation feed stream to the tri-methylbenzene rich stream is from 0.3 to 3.