Method for reducing oilseed acid value

Abstract

The invention provides a method for reducing the acid value of oil materials, which comprises: reacting the oil materials of which the acid value is to be reduced and C1-C6 monobasic alcohol in a reactor, and collecting oil materials of which the acid value is reduced, wherein the temperature in the reactor is between 100 and 330 DEG C, and the pressure in the reactor is between 0.1 and less than 5 MPa. The method not only can effectively reduce the acid value of the oil materials but also can make the reaction continuously performed, does not generate waste acid, basically does not generate wastewater, and is favorable for environmental protection and subsequent processing.

Description

technical field [0001] The invention belongs to a method for processing oil, in particular to a method for reducing the acid value of oil. Background technique [0002] Oils and fats are generally derived from vegetable oils and animal oils, and the main component is glycerides. In addition, it also contains phosphoglycerides, fatty acids, fatty alcohols, vitamins, sterols, pigments, etc. Generally, the content of fatty acids in refined oils is very low, but the acid value of unprocessed and refined oils (commonly known as crude oil), used waste oils, and various fractions (such as deodorized distillates) produced during processing High, even very high, is not conducive to further processing and utilization. [0003] For example, crude oil and waste fats and oils can be used to produce biodiesel; biodiesel can be produced by transesterification of fats and oils with monoalcohols. Before using oil with high acid value to prepare biodiesel, it is generally necessary to reduc...