Levulinic acid, Laevulinic acid, β-Acetylpropionic acid, 3-Acetopropionic acid, β-acetylpropionic acid, γ-ketovaleric acid, 4-oxopentanoic acid
|Jmol interactive 3D||Image|
|Molar mass||116.11 g/mol|
|Melting point||33 to 35 °C (91 to 95 °F; 306 to 308 K)|
|Boiling point||245 to 246 °C (473 to 475 °F; 518 to 519 K)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Levulinic acid, or 4-oxopentanoic acid, is an organic compound with the formula CH3C(O)CH2CH2CO2H. It is classified as a keto acid. This white crystalline solid is soluble in water and polar organic solvents. It is derived from degradation of cellulose and is a potential precursor to biofuels.
In 1840 the Dutch Professor G.J. Mulder mentioned levulinic acid for the first time. He synthesized it by heating fructose with hydrochloride. The former term “levulose” for fructose gave the levulinic acid its name. Although levulinic acid has been well known since the 1870s, it has never reached a commercial use in a significant volume. First commercial production of levulinic acid has begun as a batch wise process in an autoclave by A.E. Statley in the 1940s. In 1953 the US-American company Quaker Oats developed a continuous process for the production of levulinic acid. In 1956 it was identified as a platform chemical with high potential and in 2004 the US Department of Energy (U.S. DoE) identified levulinic acid by screening approximately 300 substances as one of the 12 potential platform chemicals in the biorefinery concept.
The original synthesis of levulinic acid is done by heating hexoses (glucose, fructose or starch) in diluted hydrogenchloride or sulfuric acid. The yield depends on the nature of the acid, acid concentration, temperature and pressure. In addition to formic acid further, partly insoluble, by-products are produced. These are deeply colored and their complete removal is a challenge for most technologies.
Many concepts for the commercial production of levulinic acid are based on a strong acid technology. The processes are conducted in a continuous manner using lignocellulose as inexpensive starting material which was impregnated by dilute mineral acid and transferred into a high pressure reactor where it was heated with steam to allow the reaction to form levulinic acid to take place. After cooling of the reaction mixture and filtration of the solid by-products the product, levulinic acid, is separated from the mineral acidic catalyst via extraction avoiding neutralization of the acid catalyst. This allows the recycle of the acidic catalyst while the levulinic acid could be purified from a mineral acid free an organic solvent. Pure levulinic acid was isolated by evaporation of the extraction solvent and distillation of levulinic acid. Companies who developed technology based on this concept are e.g. Biofine, DSM, Segetis and GFBiochemicals. The latter has started the commercial production of levulinic acid in 2015 at a production scale of 2,000 MT/a in Caserta, Italy. Thus, “Caserta is now the world’s largest operational production plant for levulinic acid”. 
Reactions and applications
Levulinic acid is used as a precursor for pharmaceuticals, plasticizers, and various other additives. Furthermore, it is recognized as a building block or starting material for a wide number of compounds. This family addresses a number of large volume chemical markets. For example as potential biofuels including γ-Valerolactone, 2-Methyl-THF, ethyl levulinate.
Other occurrence and niche uses
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- Franz Dietrich Klingler, Wolfgang Ebertz "Oxocarboxylic Acids" The largest application of levulinic acid is its use in the manufacturing of DALA (delta aminolevulinic acid), a biodegradable herbicide used in South Asia.8 Another key application is the use of levulinic acid in cosmetics. Ethyl levulinate, a primary derivative of levulinic acid is extensively used in fragrances and perfumes. In addition, levulinic acid is also used in certified skin cancer treatment and the application is expected to have high growth over the forecast period on account of growing demand for cosmetic products. in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a18_313
- Bozell, Joseph J.; Petersen, Gene R. "Technology development for the production of biobased products from biorefinery carbohydrates—the US Department of Energy’s "Top 10" revisited". Green Chemistry 12 (4). doi:10.1039/b922014c.
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