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Purifying method of biodiesel

A technology of biodiesel and purification method, which is applied in the field of biodiesel preparation, can solve the problems of high equipment cost and operation cost, a large amount of manpower and material resources, and is not effective and practical, and achieves strong adsorption and filtration capabilities, low energy consumption, and low operating temperature. Gentle effect with pressure

Active Publication Date: 2019-05-28
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid value indicates the degree of deterioration of the fuel. Excessive acid value will cause corrosion and deposits in the engine, but the existing technology rarely improves the acid value
Brazilian and European standards stipulate that the maximum content of total pollutants in biodiesel (referring to the insoluble substances present in the product) shall not exceed 24 mg / kg, but there is currently no effective and practical technology for the total pollutants in biodiesel
In addition, the existing purification process has many steps, complex operation, requires a lot of manpower, material resources and financial resources, has problems such as high equipment cost and operation cost, and large environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The purification process of the present embodiment is: open the valve 13 of the main percolation tower, close the valve 14 of the auxiliary percolation tower, and use the crude biodiesel stored in the crude biodiesel storage tank 8 at a flow rate of 50 L / h under the action of the centrifugal oil pump 9 Purify through a diafiltration system composed of a main diafiltration tower 10 to obtain biodiesel with a mass content of fatty acid methyl ester of 99.6%, which is sent to a biodiesel storage tank 12 for storage; the operating temperature is 20° C., and the operating pressure is normal pressure The raw material for the preparation of the crude biodiesel is soybean oil, and the preparation method is an alkali-catalyzed method; 40kg of heat-activated bauxite is filled in the main percolation tower, and the particle size of the heat-activated bauxite is 50 orders. The average diameter of the sieve hole of the heat-activated bauxite is 0.556mm, the azobenzene adsorption amou...

Embodiment 2

[0044] The purification process of the present embodiment is as follows: open the valve 13 of the main percolation tower, close the valve 14 of the auxiliary percolation tower, and use the crude biodiesel stored in the crude biodiesel storage tank 8 at a flow rate of 100 L / h under the action of the centrifugal oil pump 9 Simultaneous purification is carried out through a diafiltration system composed of two parallel main diafiltration towers 10 respectively to obtain biodiesel with a mass content of fatty acid methyl ester of 99.2%, which is sent to a biodiesel storage tank 12 for storage; the operating temperature is 25°C , the operating pressure is normal pressure; the raw material for the preparation of the crude biodiesel is rapeseed oil, and the preparation method is an acid-catalyzed method; 40kg of heat-activated bauxite has been filled in the two main percolation towers 10, and the heat-activated bauxite The particle size of the activated bauxite is 20 meshes, the avera...

Embodiment 3

[0047] The purification process of the present embodiment is as follows: open the valve 13 of the main percolation tower, close the valve 14 of the auxiliary percolation tower, and use the crude biodiesel stored in the crude biodiesel storage tank 8 under the action of the centrifugal oil pump 9 at a flow rate of 150 L / h Simultaneous purification is carried out through a diafiltration system composed of two parallel main diafiltration towers 10 to obtain biodiesel with a mass content of fatty acid methyl ester of 99.8%, which is sent to a biodiesel storage tank 12 for storage; the operating temperature is 35°C , the operating pressure is normal pressure; the raw material for the preparation of the crude biodiesel is palm oil, and the preparation method is an enzyme-catalyzed method; the two main infiltration towers 10 are all filled with 40kg heat-activated bauxite, and the heat-activated aluminum The particle size of the earth ore is 35 meshes, the average diameter of the siev...

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Abstract

The invention discloses a purifying method of biodiesel. The purifying method is characterized by purifying crude biodiesel by adopting a percolation system, thus obtaining the biodiesel, wherein thepercolation system at least comprises one percolation tower taking thermal activated bauxite as filler. According to the purifying method disclosed by the invention, the percolation tower taking the thermal activated bauxite as the filler is adopted for percolating and purifying the crude biodiesel, and the adsorption ability on impurities such as polar molecular water, methanol, sterol, glycerinum, phospholipid, acid-base catalyst residue and free fatty acid in the crude biodiesel is increased by utilizing strong adsorption and filtering functions and high purifying resolution of the thermalactivated bauxite on the impurities, so that the biodiesel with higher quality and higher purity is obtained; meanwhile, the acid value of the biodiesel is reduced, mixing of poor impurities is avoided, the quality of the biodiesel is increased, and the purifying efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, and in particular relates to a method for purifying biodiesel. Background technique [0002] Biodiesel refers to fatty acid methyl ester or fatty acid ethyl ester produced by transesterification of vegetable oil, animal fat, waste oil or microbial oil and low-carbon alcohol such as methanol or ethanol. Biodiesel is a renewable and biodegradable fuel. Compared with traditional fossil diesel, it has the characteristics of wide source of raw materials, good environmental performance, good ignition performance, more complete combustion, safety and reliability, and strong climate adaptability. It is considered is the most promising alternative to fossil-based diesel. [0003] In the prior art, at first, a liquid mixture mainly composed of fatty acid methyl ester (or fatty acid ethyl ester) and glycerol is obtained by transesterification, and then a centrifuge is used for pre-separation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/02C11B3/10
CPCY02E50/10
Inventor 杨建军贾夏
Owner CHANGAN UNIV
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