BENZENE ALKYLATION USING ACIDIC IONIC LIQUIDS

摘要

A process for making linear alkyl aromatics is described. The process involves preparing the paraffin feed by dehydrogenating normal paraffins, selectively hydrogenating any diolefins, and adsorbing any aromatics to form an olefin feed. The olefin feed is contacted with an aromatic feed in the presence of an ionic liquid catalyst to form a mixture of alkylated aromatics. The ionic liquid catalyst is separated from the mixture of alkylated aromatics by gravity, and any ionic liquid retained in the alkylated aromatics is removed by adsorption or extraction. The mixture of alkylated aromatics is then separated into monoalkylated aromatics and dialkylated aromatics.

主权项

1. A process for making linear alkyl aromatics comprising:
dehydrogenating normal paraffins in a dehydrogenation zone to form a stream comprising olefins; selectively hydrogenating diolefins in the stream comprising olefins in a selective hydrogenation zone to form a stream comprising normal olefins; adsorbing aromatics from the stream comprising normal olefins in an aromatics adsorption unit to form a stream comprising olefins having a lower aromatic content; contacting an aromatic feed and the stream comprising olefins having the lower aromatic content in the presence of an ionic liquid catalyst in an alkylation reaction zone under alkylating conditions to form a product mixture comprising a mixture of alkylated aromatics comprising monoalkylated aromatics and dialkylated aromatics, the mixture of alkylated aromatics comprising greater than 90% linear alkylated aromatics, wherein a volume ratio of ionic liquid catalyst to hydrocarbon is in a range of 0.05:1 to 2.0:1, the hydrocarbon comprising the aromatic feed and the alkylating agent, and wherein a molar ratio of the aromatic feed to the olefin is in a range of 4:1 to 8:1; separating the ionic liquid catalyst from the product mixture by gravity into an ionic liquid catalyst stream and a product mixture stream; removing any retained ionic liquid catalyst from the product mixture stream by adsorption or extraction; and separating the product mixture stream into a stream comprising the monoalkylated aromatics and a stream comprising the dialkylated aromatics.