Albany, NY -- (SBWIRE) -- 12/28/2017 -- Biodiesel can be used as alternative fuel for diesel engines. It is made from recycled cooking oil, soybean oil, and animal fat. Biodiesel is produced through a chemical process called transesterification. Soybean oil can also be substituted with straight vegetable oil, palm oil, or rapeseed oil. The transesterification reaction results in two products: biodiesel and glycerin (byproduct).
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Straight vegetable oil can directly be used as a substitute for fossil diesel. However, it is relatively viscous and leads to poor atomization of fuel, incomplete combustion, choking of fuel injectors, and accumulation of fuel in lubricating oil. A catalyst, which can either be an acid or a base, performs the function of accelerating the transesterification reaction without actually participating in it.
Three basic routes can be employed to produce biodiesel from oils and fat: base catalyzed transesterification of oil, direct acid catalyzed transesterification of oil, and conversion of oil to fatty acids and then to biodiesel. However, base catalyzed transesterification of oil is the commonly used method to produce biodiesel. This process is also economical and requires low temperatures and pressures. During the process, the alcohol reacts with fatty acids to produce biodiesel, which is chemically a mono-alkyl ester and crude glycerol. Methyl ester and ethyl ester are the commonly used biodiesel. Either sodium hydroxide or potassium hydroxide can be used as a catalyst for the production of methyl ester biodiesel. However, potassium hydroxide is more suitable for the production of ethyl ester biodiesel.
Biodiesel offers several advantages. For instance, it is rapidly biodegradable and completely non-toxic. The net output of carbon in the form of carbon dioxide after combustion of biodiesel is also negligible. Therefore, biodiesel is described as being 'carbon neutral'. Biodiesel reduces greenhouse gas emission by at least 57% and up to 86% compared to petroleum diesel. This makes it one of the practical and cost-effective ways to address climate change. Biodiesel is made from natural renewable resources. It is non-toxic and biodegrades quickly. Thus, use of biodiesel reduces human dependence on imported fuel and lowers the harsh effects of greenhouse gases on the environment. Biodiesel catalysts are easily available and their price is also fairly comparable. Handling biodiesel catalysts is easy, since the catalysts and reactants are in the same phase. These advantages coupled with the increase in need to make use of biodiesel as fuel is expected to boost the biodiesel catalyst market in the next few years.
Homogeneous catalysts used in the production of biodiesel face certain disadvantages. When acid catalyst is used, water gets formed during acid esterification. This hampers the process, thereby adding to the cost. Sulfuric acid and sodium methylate, if used as catalysts, are corrosive. Thus, they are difficult to handle. Sodium methylate poses handling problems, as it absorbs moisture. Thus, it has to be continuously kept under a nitrogen blanket. These minor drawbacks are likely to hamper the biodiesel catalyst market in the near future.
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Based on type, the biodiesel catalyst market can be bifurcated into homogeneous catalysts, which were traditionally used in the transesterification reaction for producing biodiesel; and heterogeneous catalysts, which are currently being used for producing biodiesel. Homogeneous catalysts function in a single, uniform phase (liquid, gaseous, etc.) as a reactant. Usually, homogeneous catalyst is dissolved in the solvent. In case of heterogeneous catalysts, the phase of the catalyst and the reactant are different. Heterogeneous catalysts usually exist in the solid state. These heterogeneous catalysts act on the substrate in a liquid or gaseous reaction mixture. Homogeneous and heterogeneous catalysts can be classified into acid catalyst and base catalyst. Sodium hydroxide and potassium hydroxide are used as alkaline homogeneous catalysts. In cases involving high content of free fatty acids during biodiesel production, sulfuric acid is used as a catalyst during the esterification process, while sodium methylate is employed as a catalyst during transesterification.
Several improvements are being carried out to improve the performance of biodiesel catalysts. For instance, JatroDiesel has developed heterogeneous catalysts, which are recyclable. These heterogeneous catalysts provide significant cost and operational advantage.