Method for coproducing biological diesel oil and dimeric dibasic acid ester by using animals and plants grease

A technology of animal and vegetable oils and biodiesel, which is applied in the direction of fatty acid esterification, oligomerization reaction to prepare carboxylate, biofuel, etc., can solve the problems of reducing the concentration of reactants, slowing down the polymerization reaction speed, increasing production constraints, etc. To achieve the effect of increasing the polymerization reaction speed, improving the quality and shortening the reaction time

Inactive Publication Date: 2008-09-10
JIANGSU POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

But there is obvious shortcoming in this method, the one, a large amount of saturated fatty acid esters participates in the polyreaction of unsaturated fatty acid esters, reduces the concentration of reactant, slows down polymerization speed
The second is to introduce a conjugated double bond system, which increases production constraints

Method used

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  • Method for coproducing biological diesel oil and dimeric dibasic acid ester by using animals and plants grease

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 500mL four-neck flask, add 300 grams of dried cottonseed oil and 31 grams of methanol (the molar ratio of oleyl alcohol to 1:3), stir and heat to reach the methanol reflux temperature of about 65°C, add 3 grams of solid alkali CaO, The reaction was refluxed for 3 hours. After the reaction was over, excess methanol was distilled off. The reaction solution was filtered while hot to separate the catalyst, and then the filtrate was poured into a separatory funnel and allowed to stand overnight to separate layers. Separate the lower floor by-product glycerol to obtain 288 grams of fatty acid methyl esters. The content of fatty acid methyl ester detected by chromatography is 96.5%.

[0024] Add 461 grams of 95% ethanol in 173 grams of urea, heat to reflux, after the urea dissolves completely, add 288 grams of fatty acid methyl esters (mixed fatty acid ester: urea: solvent mass ratio (W / W / W) that is preheated to 50 ℃ ) was 1:0.6:1.6), refluxed for 50min, cooled to 10°C...

Embodiment 2

[0027] In a 500mL three-necked flask equipped with a vacuum dehydration device, a thermometer, and a reflux condenser, add 300 grams of rapeseed oil, heat to 120°C, dehydrate under reduced pressure for 1-2 hours, cool to 50°C, add 150 grams of ethanol (oleyl alcohol) Molar ratio is 1: 10), 2.5 grams of potassium hydroxide, after reflux reaction for 5 hours, finish reaction, distill excess ethanol, be cooled to 50 ℃, then pour into the separatory funnel and stand for layering, separate the lower floor by-product glycerin , to obtain 298 grams of fatty acid ethyl ester. The fatty acid ethyl ester content detected by chromatography was 95.4%.

[0028] In 1192 grams of urea, add 2384 grams of methyl alcohol, heat to reflux, after the urea is completely dissolved, add 298 grams of fatty acid ethyl esters preheated to 50 ° C (mixed fatty acid ester: urea: solvent mass ratio (W / W / W) is 1:4:8), refluxed for 50min, cooled to 15°C, and stood still for 20 hours, a large amount of crysta...

Embodiment 3

[0031] In a 500mL three-necked flask equipped with a vacuum dehydration device, a thermometer and a reflux condenser, add 300 grams of waste edible oil, heat to 120°C, dehydrate under reduced pressure for 1-2 hours, cool to 50°C, add 83.5 grams of methanol (oleyl alcohol The molar ratio is 1: 8), 2.5 grams of 98% concentrated sulfuric acid, after reflux reaction for 5 hours, finish the reaction, distill off excess methanol, cool to 50°C, then pour into the separatory funnel and let stand for layering, separate the lower floor by-product Glycerol, to obtain 290 grams of fatty acid methyl esters. The content of fatty acid methyl ester detected by chromatography is 94.4%.

[0032] Add 1160 grams of methanol in 290 grams of urea, heat to reflux, after the urea is completely dissolved, add 290 grams of fatty acid methyl esters preheated to 50°C (mixed fatty acid ester: urea: solvent mass ratio (W / W / W) is 1:1:4), refluxed for 50min, cooled to 15°C, and stood still for 20 hours, a l...

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Abstract

The invention provides a method to produce bio-diesel and dimerized acid ester from combination of animal and plant lipids. Esterification is performed between animal / plant lipids and a lower alcohol containing 1-4 carbons, the product of esterification is separated into saturated and un-saturated lipid acids through urea inclusion. The condition of urea inclusion includes the ratio of lipid acid esters: urea: solvent (w / w / w) is 1: (0.6-4): (2-10), with the temperature of 0-25 DEG C and the time of 5-30 hours. The unsaturated lipid acids react for 1-12 hours under 150-300 DEG C with the presence of an acid catalyst, and the product undergoes vacuum distillation to obtain monomer lipid acid ester and dimerized acid ester. The combination of the monomer lipid ester and the saturated lipid acid ester obtained through urea inclusion is the bio-diesel. The invention increases the reaction speed, shortens the reaction time, and improves the quality of the product of dimerized lipid acid ester, because a great deal of saturated lipid acid ester does not participate in the polymerization reaction.

Description

technical field [0001] The invention belongs to a new method for preparing biodiesel, in particular to a method for jointly producing biodiesel and dimer ester by using animal and vegetable oils. Background technique [0002] The ester products obtained by esterification or transesterification of animal and vegetable oils are widely used as industrial raw materials and medicines. There are many studies on the use of fatty acid methyl esters as biodiesel, but most of them are on esterification catalysts and process conditions. At present, the fundamental problem restricting the industrialization of biodiesel in my country is the high cost, of which the cost of raw materials accounts for about 75%. As far as the current market is concerned, natural oils and fats cannot be used as raw materials for the normal industrialization of biodiesel because the price of raw materials is higher than that of biodiesel products. Since animal and vegetable oils and fats contain a large num...

Claims

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Application Information

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IPC IPC(8): C10G3/00C11C3/04C07C69/52C07C67/465
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王车礼李为民姚超邬国英林西平田刚
Owner JIANGSU POLYTECHNIC UNIVERSITY
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