A preparation process for producing biodiesel from refined oil

Abstract

The invention discloses a preparation technology of biodiesel produced from refined grease. The preparation technology comprises the following steps: 1) selecting and using qualified raw grease, methanol and a catalyst; 2) dissolving the catalyst in the methanol in an appropriate proportion; 3) performing an ester interchange reaction of a prepared catalyst methanol solution and the grease under appropriate conditions; 4) performing first-time water washing and liquid separation to remove the catalyst and glycerin which is produced by the ester interchange, and rectifying and recycling the superfluous methanol; 5) performing secondary water washing and dehydration to produce a non-standard product A; 6) obtaining a non-standard product B and tower-bottom heavy oil through vacuum distillation of the non-standard product A; and 7) obtaining a biodiesel product in strict conformance with national standard GB / T 20828-2007 by deep deacidification, water washing and dehydration of the non-standard product B. The preparation technology has stable technological processes, and can fully realize recycling of the excess methanol, reuse of soft water and saving of energy and resources. The by-product crude glycerin has extremely few impurities and good quality, and can be excellently applied to a production line of the biodiesel produced from non refined grease, and no raw material may be wasted.

Description

technical field [0001] The invention relates to a biodiesel process, in particular to a method for producing national standard biodiesel by using refined oil, that is, a method for producing national standard biodiesel by using refined oil as raw material through transesterification and deep deacidification. Background technique [0002] Biodiesel is a fatty acid monoalkyl ester obtained by transesterification of animal and vegetable oils and alcohols (such as methanol or ethanol), the most typical one is fatty acid methyl ester, expressed as BD100, and the national standard GB / T20828-2007 is implemented. Biodiesel blended fuel (B5) implements the national standard GB / T25199-2010. Biodiesel is an excellent supplement and substitute for petrochemical diesel. [0003] During the development of biodiesel, there were production methods such as direct mixing method, microemulsion method, pyrolysis method and transesterification method. The direct mixing and microemulsification ...

AI Technical Summary

Problems solved by technology

[0009] Existing biodiesel production is mainly based on gutter oil and acidified oil, which often have unstable processes, weak adaptability and compatibility of raw materials, unstable product quality, and high energy consumption.

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