Feedstock preparation of olefins for oligomerization to produce fuels

US7741526B2 · kind B2 · utility

Assignee

• ExxonMobil Chemical Patents Inc. · US

Inventors

• Keith H. Kuechler · Friendswood, US
• Stephen H. Brown · Lebanon, US
• Marc P. H. Puttemans · Schepdaal, BE
• Steven E. Silverberg · Seabrook, US
• An Verberckmoes · Serskamp, BE

Key dates

• Filing date: Jul 19, 2006
• Grant date: Jun 22, 2010
• Expiry date: Feb 16, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P30/40
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A feedstock containing at least 1 wt % butenes, at least 1 wt % pentenes, at least 1 wt % hexenes, at least 10 wppm C4 dienes, at least 10 wppm C5 dienes, and optionally at least 10 wppm C6 dienes can be selectively hydrogenated over a catalyst (e.g., a noble metal) to form a stream containing 100 wppm to 4000 wppm total dienes. The hydrogenated stream, and an olefinic recycle stream having less than 10 wt. % C1+ moieties, can be contacted with a molecular sieve catalyst, e.g., at a recycle to feed ratio between 0.1 and 3.0, at a WHSV of at least 1.0 based on olefin in the feed, and at a reactor ΔT no greater than 40° F. (22° C.), thus forming a reaction product that can then be separated into a distillate, e.g., having from 1 wt % to 30 wt % non-normal C9 olefins, and the aforementioned olefinic recycle stream.