Method for preparing biodiesel with no byproduct glycerol

Abstract

The invention discloses a method for preparing biodiesel with no byproduct glycerol. The method comprises: mixing a transesterification reagent with animal-vegetable fat; performing reaction at a temperature between 30 and 450 DEG C for 2 to 18 hours, wherein the mass ratio of the transesterification reagent to the animal-vegetable fat is 1:1-30:1; the addition amount of catalysts is 1 to 30 percent of the mass of the animal-vegetable fat; and the pressure in a reactor is 0.05 to 30 MPa; filtering to remove the catalysts; distilling to remove excessive transesterification reagent; and obtaining a product which is biodiesel. The product has no byproduct glycerol. The method has the advantages that the pollution of methanol steam at high temperature is avoided; the catalysts are easy to separate, need no washing and produce no wastewater, thereby providing possibility for the reuse of the catalysts so as to solve heavy technical and economic burdens arising in the prior biodiesel preparation process; and the transesterification of the fat and the novel transesterification reagent can co-produce glycerol as down-stream product which is taken as one of the components of the biodiesel, needs no separation, produces no glycerol byproduct, and improves the utilization rate of raw materials.

Description

【Technical field】 [0001] The invention relates to the technical field of green and renewable new energy, and belongs to a new process for preparing biodiesel, in particular referring to a new type of transesterification reagent catalyzed by solid acid, solid base, loaded solid acid, loaded solid base or organic base catalyst A new method for preparing glycerol-free biodiesel from animal and vegetable oils. 【Background technique】 [0002] Biodiesel is a series of mono-alkyl esters of long-chain fatty acids, which has similar combustion properties to petrochemical diesel, and is an environmentally friendly fuel that can replace petrochemical diesel. With the increasing depletion of petroleum resources and the improvement of people's awareness of environmental protection, biodiesel, as a clean energy source, has attracted widespread attention. Its raw materials mainly come from renewable resources such as animal and vegetable oils, which are not limited by reserves, and the ra...

AI Technical Summary

Problems solved by technology

[0013] -R represents a linear, mono- or polyunsaturated alkyl or alkenyl group containing 1 to 22 carbon atoms. CN1694877A and WO2004 / 052874 propose the application of a mixture of fatty acid esters as a fuel or solvent. In the mixture Contains one or more fatty acid alkyl esters and one or more glycerol carbonate fatty acid esters; the catalysts mentioned are all homogeneous catalysts, which cannot fundamentally solve the problem of wastewater pollution caused by catalysts

[0014] It can be seen from the technologies disclosed in the above patents that the joint production of glycerol in biodiesel production is concentrated in the field of homogeneous catalysis, and cannot fundamentally solve the problem of a large amount of wastewater brought about in the production of biodiesel; Fundamentally solve the problem of excess glycerin

Images