Biodiesel is how to produce?
Chemical production:The production of biodiesel by chemical method is bio oil with methanol or ethanol and other alcohols, and using sodium hydroxide (accounting for 1% of the weight of oil) or alcohol methyl sodium (Sodium methoxide) as a catalyst in acid or alkaline catalyst and high temperature (230 ~ 250 DEG C) under the transesterification reaction (transesterification), generation the corresponding fatty acid methyl or ethyl ester, after washing and drying to obtain the biological diesel oil. Methanol or ethanol can be recycled in the production process, the production equipment is the same as the general oil production equipment, the production process produces about 10% of the by-product glycerol.
Method for preparing biological diesel oil:By using the method of synthesis of biodiesel oil; using biodiesel and preparation of animal oil to produce biodiesel and additives; fuel oil; waste animal and vegetable oil production of light diesel oil emulsifier and its application; liquefaction technology and equipment of biomass low cost and no pollution; low energy consumption technology and equipment of biomass pyrolysis; preparation method the use of microalgae biodiesel fast pyrolysis; waste plastics, waste oil and waste vegetable oil for extracting gasoline and diesel depolymerization kettle method for biomass gasification to produce fuel gas and gasification reaction; extraction method of petroleum products with vegetable oil foot; using the method of plasma pyrolysis and gasification of biomass syngas. With the starch culture method of heterotrophic algae biodiesel; for the production of liquid fuels from biomass; with vegetable oil leftover fuel production Process oil, preparation method of bio oil from biomass hydrolysis residue preparation, production method of vegetable oil extraction of gasoline and diesel oil; fuel oil waste oil regeneration device and method; method of degumming in FCC diesel; waste rubber (waste plastics, waste oil) new environment-friendly process of oil refining, chemical refining method the total oxidation insoluble and colloid removal from diesel fuel, gasoline and diesel; prevent discoloration of gelling agent; flocculation of waste lubricating oil separation method.
But the chemical synthesis of biodiesel has the following disadvantages: high reaction temperature and complicated process; excessive use of methanol in the reaction process, the subsequent process must have the corresponding alcohol recovery device, the complicated process and high energy consumption; oil in the raw water and free fatty acids will seriously affect the biodiesel yield and product quality; purification the complex, difficult to esterification product recovery; byproducts of the reaction is difficult to remove, but also produce large amounts of wastewater using alkali catalyst and alkali (acid) solution is easy to cause two pollution emissions on the environment.Chemical production and a serious problem: the cost of the production process using alkaline catalyst for raw materials must be such as crude oil, crude rapeseed oil and soybean oil, raw material costs accounted for 75% of the total cost. Therefore the use of cheap raw materials and improve the conversion to reduce the cost of biodiesel is the key to practical, so the United States has begun through the genetic engineering method of high oil content of the plant (see "project microalgae" method), Japan uses industrial waste oil and waste frying oil, Europe is rich in oil is not suitable for planting food crops crops on the land.
