Esterification method of kitchen waste grease-subcritical gaseous methanol

Abstract

The invention relates to a kitchen waste grease-subcritical gaseous methanol esterification method which comprises the following steps: S1, preparing subcritical gaseous methanol from liquid methanol, and preheating kitchen waste grease; the method comprises the following steps: S1, preparing subcritical gaseous methanol from liquid methanol, and preheating kitchen waste grease; s2, respectively inputting the subcritical gaseous methanol and the kitchen waste oil into an esterification reaction container for mixing, and carrying out esterification reaction of alcohol and acid to obtain esterified oil; and S3, rectifying and recovering the unreacted subcritical gaseous methanol through a methanol rectifying tower to obtain liquid methanol. Compared with the prior art, the esterification method of the kitchen waste grease-subcritical gaseous methanol has the advantages that the liquid methanol is converted into the subcritical state, so that the property of the liquid methanol is more active, and the liquid methanol and the kitchen waste grease can be subjected to esterification reaction under the condition of no catalyst; therefore, the problems that the acid value of esterified acid is too high and solid waste is generated due to the existing catalyst are thoroughly solved.

Description

technical field [0001] The invention relates to the technical field of kitchen waste grease treatment, in particular to a method for esterification of kitchen waste grease-subcritical gaseous methanol. Background technique [0002] Kitchen waste oil, scientifically called waste oil, generally refers to all kinds of inferior oils that exist in life, such as recycled edible oil, repeatedly used frying oil, etc. The main components are fatty acids (including saturated fatty acids and unsaturated fatty acids). The largest source of kitchen waste grease is the grease trap in the sewers of large urban restaurants. Long-term consumption may cause cancer, which is extremely harmful to the human body. [0003] At present, the method of sulfuric acid-catalyzed esterification is generally used to treat waste kitchen oil, that is, methanol is reacted with fatty acid to generate fatty acid methyl ester, commonly known as esterified oil. As disclosed in 201410718228.4, a method for prep...

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Problems solved by technology

[0004] In view of this, it is necessary to provide a method for esterification of kitchen waste oil-subcritical gaseous methanol to solve the technical problem in the prior art that processing waste kitchen oil will generate solid waste and require subsequent treatment

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