Browse Prior Art Database

METHOD AND APPARATUS FOR IRRADIATING PYROLYSIS OIL

IP.com Disclosure Number: IPCOM000191504D
Publication Date: 2010-Jan-06
Document File: 6 page(s) / 33K

Publishing Venue

The IP.com Prior Art Database

Abstract

Pyrolysis oil is irradiated with ultraviolet (UV) radiation to: 1) decrease total acid number (TAN), 2) stabilize, 3) upgrade, and 4) deoxygenate the pyrolysis oil. UV irradiation of pyrolysis oil removes the carboxyl group and carbonyl groups of carboxylic acids and aldehydes, respectively, thereby decreasing its total acid number (TAN) and stabilizing it.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 6

RP13179

BRIEF ABSTRACT

    Pyrolysis oil is irradiated with ultraviolet (UV) radiation to: 1) decrease total acid number (TAN), 2) stabilize, 3) upgrade, and 4) deoxygenate the pyrolysis oil. UV irradiation of pyrolysis oil removes the carboxyl group and carbonyl groups of carboxylic acids and aldehydes, respectively, thereby decreasing its total acid number (TAN) and stabilizing it.

KEYWORDS

    Pyrolysis oil, ultraviolet, irradiation, UV, total acid number, TAN, decarboxylation, decarbonylation, pyrolysis, photocatalyst.

DETAILED DESCRIPTION

    Pyrolysis oil, also known as bio-oil or biocrude, is a bio-derived material that can be used as a fuel or chemical feedstock. Pyrolysis oil is produced by pyrolysis of biomass. The pyrolysis process is a thermochemical conversion process, which involves heating biomass to temperatures of several hundred degrees Celsius in the absence of oxygen.

    Pyrolysis oils are, generally, considered inferior to bio-fuels because in their native form they are unstable, viscous and have a high Total Acid Number (TAN). The TAN of crude oils is a measure of the amount of carboxylic acids (especially naphthenic acids) in the crude oil. These acids cause equipment

1

METHOD AND APPARATUS FOR IRRADIATING PYROLYSIS OIL

Page 2 of 6

RP13179

failures due to corrosion, leading to high maintenance costs, environmental disposal problems, reduced product quality, and other problems.

    There exist various conventional techniques for improving the characteristics of pyrolysis oil. Such techniques involve treatment with alcohols, distillation of light reactive volatiles, and hydrotreatment. Addition of methanol reduces the viscosity and TAN of the bio-oil remarkably, as well as slowing down the ageing rate. The hydrotreatment process is used for deoxygenating.

    However, all such conventional techniques are unable to satisfactorily perform TAN reduction and/or stabilization and/or upgrading and/or deoxygenating. Also, for practical uses, the pyrolysis oil needs to be upgraded in a cost-effective manner. Therefore, there is a need in the art for a cost-effective technique that allows upgrading of the pyrolysis oil, such that it effectively reduces TAN content, deoxygenates and stabilizes the oil.

    Figure 1 illustrates a schematic diagram of an apparatus for irradiating the pyrolysis oil. A source of UV radiation / White light is placed inside a hollow cylindrical transparent tube. The transparent tube is coated with a photo catalyst (e.g., a metal chalcogenide) and is placed inside another concentric tube. The catalyst may be appended with a sensitizer (such as a dye molecule) to increase its light harvesting characteristics. Further, an inner surface of the outer concentric tube is coated with a reflective coating such that the radiation (UV or white) is reflected back towards the interior. The pyrolysis oil is allowed to flow through a space between the transparent tube and outer concentr...