Process for preparing biodiesel by using low-acid-value waste oil

Abstract

The invention discloses a process for preparing biodiesel by using low-acid-value waste oil. The procedures of dehydration, pre-esterification reaction, esterification reaction, slurry sedimentation, glycerin separation, and the like are carried out on the collected low-acid-value waste oil by introducing a plug flow reactor to obtain the biodiesel. By collecting low-acid-value waste oil generated in daily life of people and converting and synthesizing the collected low-acid-value waste oil into the biodiesel, the invention realizes waste recycling effect and is helpful to relieving the current predicament of diesel fuel shortage and atmospheric pollution pressure for diesel fuel combustion at the same time.

Description

technical field [0001] The invention relates to a process for preparing biodiesel, in particular to a process for preparing biodiesel by using waste oil with low acid value. Background technique [0002] Biodiesel refers to fatty acid methyl ester produced by transesterification of vegetable oil, animal oil and methanol. It is a clean biofuel, also known as "renewable fuel oil". Under the background of the current world energy shortage, countries all over the world are scrambling to develop and research biodiesel to replace diesel oil, which has great strategic significance to deal with the energy crisis, reduce environmental pressure, and control atmospheric environmental pollution. In my country, there are currently many units producing or selling biodiesel in the market, but due to the reliability of its technology, the difficulty of raw material sources, and the irregularity of sales channels, biodiesel has not been accepted by the market. [0003] In addition, in China...

AI Technical Summary

Problems solved by technology

In addition, in the existing biodiesel preparation process, the loss of methanol in the esterification process is large and the production cost is high, and the existing process esterification reaction and transesterification reaction are all carried out in the reactor, because the esterification reaction is generally The time is long, and the transesterification reaction process generally takes a short time. Therefore, the entire biodiesel production process cannot be connected back and forth, which seriously affects the production efficiency and production cost of biodiesel.

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