METHODS AND APPARATUSES FOR PRODUCING XYLENE FROM PROPYLBENZENE

摘要

Methods and apparatuses are provided for producing xylene. A method includes combining a propylbenzene containing feed with a xylene raffinate stream, where the xylene raffinate stream is provided from a xylene recovery unit. The xylene raffinate stream and the propylbenzene containing feed are isomerized in an isomerization unit to produce an xylene isomerization effluent stream, where the xylene isomerization effluent stream includes aromatic compounds having 8, 9, or 10 carbons atoms. The aromatic compounds having 8 carbon atoms are separated from the aromatic compounds having 9 or 10 carbons, and the aromatic compounds having 8 carbons are fed to the xylene recovery unit. The aromatic compounds having 9 or 10 carbons are transalkylated with toluene to produce xylene.

主权项

1. A method of producing xylene comprising:
combining a propylbenzene containing feed with a xylene raffinate stream, wherein the xylene raffinate stream is provided from a xylene recovery unit; isomerizing the xylene raffinate stream and the propylbenzene containing feed in an isomerization unit to produce an xylene isomerization effluent stream comprising aromatic compounds having 8 carbon atoms (A8 compounds) and aromatic compounds having 9 to 10 carbon atoms (A9-10 compounds); separating the A8 compounds from the A9-10 compounds; feeding the A8 compounds to the xylene recovery unit; and transalkylating the A9-10 compounds with toluene to produce xylene.