Low energy consumption production method of biological diesel oil

Abstract

The invention relates to a method for preparing biodiesel with low energy consumption, belonging to biological oilseed synthesis field. The current technology is characterized by long time- consumption for biological enzyme catalysis, large wastewater generation by homogeneous acid alkaline catalysis, and large energy consumption of supercritical method. The invention takes short- chain alcohol as acyl accepter, takes porous composite catalyst to catalize ester exchange reaction and converse biological oil material into biodiesel. The solid porous composite catalyst is characterized by large contacting area with reactant, high catalytic efficiency, no alkaline wastewater, and easy separation of catalyst from product; the pH of produced biodiesel is 7, which saves washing process; there is no need for high temperature and pressure, which reduces energy consumption; pretreating short-chain alcohol with heat exchanger, and the short-chain alcohol is pumped into ester change room by gas circulation pump, which increases the vortex in reaction room for stirring and thus saves stirrer expense.

Description

technical field [0001] The invention relates to a method for producing biodiesel with low energy consumption. It belongs to the field of bio-oil synthesis. Background technique [0002] Fatty acid esters produced by the transesterification of biological oils and short-chain alcohols are 0 # A good alternative to diesel is known as biodiesel. The kinetic model for generating biodiesel by transesterification reaction is: [0003] <chemistry num="001"> <chem file="200610034240_CML001.XML" / > < / chemistry> [0004] <chemistry num="002"> <chem file="200610034240_CML002.XML" / > < / chemistry> [0005] <chemistry num="003"> <chem file="200610034240_CML003.XML" / > < / chemistry> [0006] Among them, TG, DG, MG, and GL represent triglyceride, diglyceride, monoglyceride, and glycerol, respectively. The techniques used in the transesterification process usually include biological enzyme catalysis, homogeneous acid-base cat...

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Problems solved by technology

[0007] In the disclosed technology, as described in CN 1190471C, lipase is applied to the preparation of biodiesel, which has high activity for transesterification reaction, and the reaction conditions are mild, but it is difficult to recycle lipase, and the enzyme is very easy to lose Live, the reaction time is too long, it is difficult to apply to industrial production

Described in CN 1238468C, is a kind of method that utilizes homogeneous acid-base catalyst to catalyze the production of biodiesel, it does not need to react under high temperature and high pressure, and the catalyst cost is low, but there is the common shortcoming of homogeneous catalytic reaction, produces a large amount of esterification waste water, is difficult to deal with

Supercritical method, as described in CN 1594504A and CN 1626621A, transesterification reaction occurs in a supercritical state, which has the characteristics of high reaction yield and less pollution discharge, but has high requirements for equipment and large energy consumption

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