Method for synthesizing fatty acid methyl ester

Abstract

The invention discloses a method for synthesizing fatty acid methyl ester , which belongs to process and technique field of ester material through chemical modification, the procedures of the method comprises that fat raw material is filtered to remove impurity and heated to 160 DEG C in the preheater and is pressurized to 1-4 Mpa after dehydrating in the continuous vacuum flash evaporation dehydrator under the pressure of -0.09 Mpa and is heated to 110-240 DEG C by preheater and enters in the esterifying reaction tower from the top continuously. The raw material carbinol is pressurized to 1-4 Mpa by water pump and is heated to 110-240 DEG C after vaporizing, and then enters in the esterifying tower through gas distributor from the bottom of the esterifying reaction tower. The fat raw material from top to bottom and carbinol gas from bottom to top are in countercurrent contact to generate chemical reaction and chemical procedures as hydrolysis, esterification and ester exchange and stripping, adsorption, rectification and the like to produce product acted by high temperature and pressure. Compared with the prior art, the invention is low in raw material cost, little in equipment corrosion and small in carbinol consumption.

Description

(1) Technical field: [0001] The invention relates to a fatty acid methyl ester (biodiesel), in particular to a method for obtaining ester substances through chemical modification of oil. (two) background technology: [0002] Due to the increase in world energy consumption and the shortage of oil resources, the price of crude oil has skyrocketed, which has triggered a growing demand for renewable energy biodiesel, and its production has developed rapidly. Most of the production methods use soybean oil and rapeseed oil to be refined to free acid content< After 0.1%, it can be synthesized by transesterification reaction with methanol solution of basic catalyst. [0003] For raw materials with high free fatty acid content, the alkaline transesterification method is not applicable. For raw materials with high free fatty acid content, the alkaline transesterification method can also be used after first using an acid catalyst to esterify to reduce the free fatty acid content. ...

AI Technical Summary

Problems solved by technology

[0005] In summary, these methods all have shortcomings: the alkaline transesterification method needs to use refined soybean oil and rapeseed oil as raw materials, and the cost is high

The acid-catalyzed esterification exchange method requires enamel equipment due to its strong corrosiveness, which is not conducive to large-scale production, and the large amount of sulfuric acid is likely to cause environmental pollution

High-temperature and high-pressure or supercritical esterification requires high-grade alloy materials for equipment due to strong corrosion, which requires a large investment, and requires rapid cooling after high-temperature reaction, resulting in high energy consumption.

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