Preparation technology of biodiesel produced from non refined grease

Abstract

The invention discloses a preparation technology of biodiesel produced from non refined grease. The preparation technology comprises the following steps: 1) selecting and using qualified methanol and a catalyst A; 2) adding the catalyst A into the grease, adding excess methanol for a pre-esterification reaction, performing rectification regeneration of gas phase methanol; 3) dissolving an appropriate proportion of a catalyst B in the methanol; 4) performing an ester interchange reaction; 5) performing water washing and liquid separation to remove the catalyst B and glycerin produced by the ester interchange, rectifying and recycling the superfluous methanol to obtain 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 meeting 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 can be in good abutting joint with a glycerin refining production line, and the by-product tower-bottom heavy oil and waste oil produced by deacidification and the like can be fully recycled, and are of good quality.

Description

technical field [0001] The invention relates to a biodiesel process, in particular to a preparation process for producing national standard biodiesel by using non-refined oil. 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 fatty acid methyl ester is represented by BD100, and the national standard GB / T 20828-2007 is implemented. Biodiesel blended fuel (B5) implements the national standard GB / T 25199-2010. 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 methods are mixing animal and vegetable oils into petrochemical diesel oil without changing the chemical composition of the oils. The ...

AI Technical Summary

Problems solved by technology

However, in the prior art, there are still many problems in the process of producing national standard biodiesel with unrefined oil as raw material, such as the process is not stable enough, the quality is poor, and the utilization rate of raw materials is not high.

Images