Biodiesel production method

Abstract

The invention relates to a biofuel production method, and especially relates to a biodiesel production method with mild reaction conditions, a high conversion rate, high yield, and no waste water discharge. The biodiesel production method comprises the following steps: S1, mixing raw materials of grease and medium and short-chain alcohol, completing a transesterification reaction under the actionof a homogeneous base catalyst; S2, separating the reaction solution completing the transesterification reaction to obtain crude biodiesel; S3, adding a solid neutralizer into the crude biodiesel, reacting for 10-60 minutes; S4, separating the solid neutralizer to obtain the biodiesel.

Description

technical field [0001] The invention relates to a biofuel production method, in particular to a biodiesel production method with mild reaction conditions, high conversion rate, high yield and no waste water discharge. Background technique [0002] With the depletion of fossil fuels and the deterioration of the ecological environment, countries around the world regard the development of biomass energy as their future energy strategy in order to get rid of the heavy dependence on fossil energy. As a renewable and environmentally friendly new energy source, biodiesel is favored by researchers from all over the world. Biodiesel is a long-chain fatty acid monoalkyl obtained by transesterifying animal fats, woody oil crops, herbaceous oil crops, seaweeds, and industrial and catering industry waste oils with low-carbon alcohols such as methanol and ethanol. ester. It has appeared four different production methods: direct mixing method, microemulsion method, thermal cracking metho...

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Problems solved by technology

Among them, patent CN101045878, a method for producing biodiesel using solid acid and solid base two-step catalytic method uses solid superacid as catalyst, but the reaction temperature is high and the catalyst price is also relatively expensive; patent CN101884931, a solid superacid The preparation method of catalyst and the solid acid SO prepared in application 4 2- / ZrO 2 -CeO 2 As a catalyst for the preparation of biodiesel from jatropha oil, but this catalyst is not only cumbersome to prepare but also requires a longer time and higher temperature for transesterification; patent CN101474571, a hydrotalcite-like catalyst is prepared in a solid base catalyst for the preparation of biodiesel The compound was used as a catalyst for the production of biodiesel with satisfactory yields, but required a longer reaction time and higher reaction temperature

In summary, although the use of solid acid-base catalysts instead of traditional acid-base catalysts for the preparation of biodiesel has the advantage of no waste water discharge, but because the reaction is a heterogeneous reaction, it is different from homogeneous catalytic reactions (such as using sodium hydroxide as a catalyst, etc.) ) in comparison, there are problems such as longer reaction time, higher reaction temperature, higher alcohol-oil ratio, cumbersome preparation of catalyst, and high price. It is difficult to realize industrial production in a short period of time.

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