Pre-treatment method used for preparing biodiesel from swill oil and trench oil

Abstract

The invention discloses a pre-treatment method used for preparing biodiesel from swill oil and trench oil. The pre-treatment method comprises following steps: step 1, swill oil and trench oil are chosen as waste raw oil, and are delivered into a discharging pond; step 2, an acid solution is added, and the mixed solution is heated and mixed so as to realize complete acidification of the waste raw oil; step 3, after acidification, the mixed solution is allowed to stand so as to realize liquid separation, and an upper oil layer, a middle waste water layer and a lower residue layer are obtained; step 4, the upper oil layer is collected, and is filtered so as to remove slag; step 5, after filtration , a concentrated acid is added into the filtered oil layer, and the mixture is boiled by heating so as to realize carbonization polymerization and precipitation separation of a large amount of impurities, and obtained acidized oil; and step 6, the acidized oil is subjected to water washing, dehydrating and decolouring so as to obtain refined waste oil. Beneficial effects of the pre-treatment method are that: the pre-treatment method is capable of preparing refined waste oil, which is low in water content and impurity content, is uniform in quality, and is suitable for application in stable biodiesel production lines, from waste cooking oil with complex composition and nonuniform quality.

Description

Technical field [0001] The invention relates to a biodiesel production process, in particular to a pretreatment process for producing biodiesel by using swill oil and waste oil to prepare refined waste grease meeting the requirements of biodiesel production to ensure the stability of the biodiesel process. 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, represented by BD100, which implements the national standard GB / T20828~2007. Biodiesel blended fuel (B5) implements the national standard GB / T25199~2010. Biodiesel is an excellent supplement and substitute for petrochemical diesel. [0003] In the development process of biodiesel, there have been production methods such as direct mixing method, microemulsification method, pyrolysis method and transesterification method. The direct mixing and micro-emulsifi...

AI Technical Summary

Problems solved by technology

[0009] The main manifestations of biodiesel production from catering waste oil, mainly swill oil and gutter oil, are: high and unstable water content in raw materials, resulting in catalyst failure, coking in the reactor, pipe blockage, corrosion, mechanical damage such as pumps, and incomplete reaction , high energy consumption, low yield, unstable process, poor product quality, etc.

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