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Catalytic process for converting renewable resources into paraffins for use as diesel blending stocks

a technology of renewable resources and catalysts, applied in the direction of physical/chemical process catalysts, hydrocarbon oil treatment products, fatty acid chemical modification, etc., can solve the problems of increasing the environmental footprint of fossil fuels, the need for costly diesel engine modification, and the poor performance of bio-diesel in cold weather applications

Inactive Publication Date: 2008-12-18
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]Provided is a process for hydrodeoxygenation of a renewable resource which process comprises (a) providing a feed which is a renewable resource; (b) contacting the feed with a catalyst in the presence of hydrogen at a temperature of 250 to 425° C. and a pressure of 500 to 2500 psig (3,450 to 17,250 kPa), wherein the catalyst comprises an oxide, molybdenum one or more active metals selected from the group consisting of nickel, cobalt, or mixtures thereof, and the catalyst is in sulfided form, to produce a hydrocarbon product having a ratio of odd-numbered hydrocarbons to even-numbered hydrocarbons of at least 2:1.

Problems solved by technology

The high cost and increased environmental footprint of fossil fuels and limited petroleum reserves in the world have increased the interest in renewable fuel sources.
To be used as diesel fuel, costly modification of diesel engine is necessary as well as conversion of associated piping and injector configurations.
Other disadvantages include poor performance of bio-diesel in cold weather applications, limiting its world wide use to warmer climates, and poor emissions.
In addition, use of bio-diesel increases maintenance costs due to poor lubricity, increased viscosity, and high oxygen content.
Bio-diesel, while a renewable resource, brings a high cost of use for processing and use in engines.
Nickel catalysts produced unwanted heavier products such as dimers due to the recombination of moieties resulting from extensive cracking of the feed material.
Such processes suffer from one or more deficiencies such as requiring multiple steps, multiple reactors, different catalysts per step and expensive precious metal catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066]Soybean oil (100 g, available from Sigma-Aldrich Co., St. Louis, Mo.) and a reduced Ni / NiO / MgO / SiO2 / graphite catalyst (Pricat Ni 55 / 5 P, >30 wt % Ni metal, >25 wt % NiO, 5 g, available from Johnson Matthey, West Deptford, N.J.) were placed in a 400 cc agitated pressure reactor. Soybean oil comprises triglycerides with the following distribution chain lengths: C12=5%, C14=5%, C16=10%, C18=3%, C18:1=20%, C18:2=50%, C18:3=7%. C18:1 refers to an 18 carbon chain with 1 unsaturated bonds, C18:2 refers to an 18 carbon chain with 2 unsaturated bonds, and C18:3 refers to an 18 carbon chain with 3 unsaturated bonds. The autoclave headspace was purged first with nitrogen 10 times by pressurizing / depressurizing between 90 and 0 psig (722 and 101 kPa), then with industrial grade hydrogen (high pressure 99% purity, available from GTS Inc., Morrisville, Pa., USA) 5 times, and finally pressurized to 500 psig (3550 kPa) with hydrogen. The autoclave and its contents were heated to 250° C. with ...

example 2

[0068]Soybean oil (50 g) and the catalyst used in Example 1 were placed in a 400 cc agitated pressure reactor. The reaction was run at 300° C. and the catalyst contained USY zeolite powder (0.125 g, type EZ-190, available from Engelhard (now part of BASF), Si / Al=3.05) physically mixed in. The reaction contents were weighed (51 g). The sample was base transesterified. IR showed the sample to be pure hydrocarbon with a trace of ester. A proton NMR analysis showed that the ester impurity was minute (18+=1%, C18=2%, C17=78%, C16=3%, C15=11%, C14=1%, C14−=4%. Some branching (17” was observed.

example 3

[0069]The process of Example 2 was repeated using the same equipment, pressure and temperature conditions, and the reactants except for the catalyst and no zeolite was added. The catalyst used was reduced nickel powder (45 wt % Ni metal, 24 wt % NiO catalyst on zirconia and kieselguhr (E-473P, 2.5 g, available from BASF Catalysts, Houston, Tex., USA). The reaction products were weighed (51 g). An IR spectrum showed no ester in the sample. A GC-FID analysis gave the following linear paraffin (hydrocarbon) distribution by weight: C18+=1%, C18=2%, C17=84%, C16=1%, C15=11%, C14−=1%. Branching was not observed.

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Abstract

A process for converting renewable resources such as vegetable oil and animal fat into paraffins in a single step which comprises contacting a feed which is a renewable resources with hydrogen and a catalyst which comprises molybdenum, a non-precious metal and an oxide to produce a hydrocarbon product having a ratio of even-numbered hydrocarbons to odd-numbered hydrocarbons of at least 2:1.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a process and a catalyst for the production of linear and branched paraffins (hydrocarbons) from renewable resources, that are useful as a blending stock for diesel fuel for use in warm and cold climates.BACKGROUND OF THE INVENTION[0002]The high cost and increased environmental footprint of fossil fuels and limited petroleum reserves in the world have increased the interest in renewable fuel sources. Renewable resources include ethanol from corn and sugar for use in automobiles, and plant oils for use as diesel fuel. Research in the diesel fuel area includes two main areas, bio-diesel and green diesel.[0003]Transesterification of fatty acids in triglycerides into methyl esters using methanol and a catalyst such as sodium methylate, produces FAME (Fatty Acid Methyl Ester), which is commonly referred to as bio-diesel. These methyl esters, mainly linear C14 to C22 carboxylic acids, can be used as fuel or can be blended into d...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C1/02
CPCB01J23/75B01J23/755B01J23/78B01J23/883B01J29/06B01J29/084B01J37/18B01J37/20C10G2400/04C11C3/123Y02E50/13C10L1/08C10G3/45C10G3/50C10G3/54C10G2300/1014C10G2300/1018C10G2300/4006C10G2300/4012C10G2300/4081C10G2300/44C10G2300/802Y02P30/20Y02E50/10
Inventor DINDI, HASANSENGUPTA, SOURAV K.GONZON, ANDREW FRANCIS
Owner EI DU PONT DE NEMOURS & CO
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