fulltext.study @t Gmail

Processing biomass in conventional oil refineries: Production of high quality diesel by hydrotreating vegetable oils in heavy vacuum oil mixtures

Paper ID Volume ID Publish Year Pages File Format Full-Text
44108 46003 2007 10 PDF Available
Title
Processing biomass in conventional oil refineries: Production of high quality diesel by hydrotreating vegetable oils in heavy vacuum oil mixtures
Abstract

Renewable liquid alkanes can be produced by hydrotreating of vegetable oils and vegetable oil–heavy vacuum oil (HVO) mixtures at standard hydrotreating conditions (i.e. 300–450 °C) with conventional hydrotreating catalysts (sulfided NiMo/Al2O3). The reaction pathway involves hydrogenation of the CC bonds of the vegetable oils followed by alkane production by three different pathways: decarbonylation, decarboxylation and hydrodeoxygenation. The straight chain alkanes can undergo isomerization and cracking to produce lighter and isomerized alkanes. The carbon molar yield of straight chain C15–C18 alkanes was 71% on a carbon basis (the maximum theoretical yield for these products is 95%) for hydrotreating of pure vegetable oil under optimal reaction conditions. The rate of alkane production from pure sunflower oil is greater than the rate of hydrodesulfurization of a HVO with a 1.48 wt% sulfur content (e.g. 100% conversion of sunflower oil at 350 °C compared to 41% conversion of sulfur). The yield of straight chain alkanes increases when sunflower oil is mixed with HVO, illustrating that dilution of HVO can improve the reaction chemistry. For example, with a 5 wt% sunflower oil–95 wt% HVO feed the maximum theoretical straight chain C15–C18 yield from the sunflower oil was higher (87%) than it was with the pure sunflower oil (75%). Mixing the sunflower oil with HVO does not decrease the rate of desulfurization indicating that sunflower oil does not inhibit the hydrotreating of HVO.

Graphical abstractTri-glycerides (vegetable oil) are catalytic hydrotreated together with a heavy gas-oil. Different ratios vegetable oil/heavy gas-oil have been studied, showing the relative rate of decarboxylation, decarbonylation and dehydration hydrogenation and isomerization as a function of reaction conditions to give excellent diesel n-and i-alkanes. No influence of the vegetable oil on HDS of the heavy oil was observed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrotreating; Biofuels; Biodiesel; Vegetable Oils; Catalysis
First Page Preview
Processing biomass in conventional oil refineries: Production of high quality diesel by hydrotreating vegetable oils in heavy vacuum oil mixtures
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 329, 1 October 2007, Pages 120–129
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us