Method for preparing biodiesel and co-producing triacetin

A technology of glycerol acetate and biodiesel, which is applied in the direction of biofuel, carboxylic acid ester preparation, fatty acid esterification, etc., can solve the problems that do not involve the co-production and utilization of glycerol, a by-product of transesterification, and achieve unique catalytic characteristics and catalytic performance Stable, easy-to-separate effect

Inactive Publication Date: 2013-03-27
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acid-functionalized ionic liquids have been reported in the literature (CN200510086385.9, CN200610083300.6, CN102031202A) to prepare biodiesel by catalyzing the transesterification of oils and fats, and achieved ideal research results, but the ionic liquids used in these documents are all Or Lewis acidic mono-acid ionic liquid, and does not involve the co-production and utilization of glycerol, a by-product of transesterification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: 100g high acid value grease (acid value 2.0mgKOH / g), 22.9g methanol and 2.0g ionic liquid (3-sulfonic acid) propyltriethylammonium chloride zincate (wherein 3-sulfonic acid chloride The molar ratio of acid propyltriethylammonium salt to zinc chloride is 1:3), added into the autoclave, heated and stirred, and reacted at 50°C for 12h. After static cooling, the mixture was taken out and allowed to stand for layering and phase separation. The upper layer of biodiesel was neutralized, washed with water and dehydrated to obtain 99.0 g of biodiesel (98.5% yield). The residue obtained after removing methanol and water from the ionic liquid phase of the lower layer is 1: 3.5 according to the molar ratio of glycerin and acetic acid. The by-product acetic acid is reclaimed under pressure, and the gained residue is left to separate phases. The upper strata is glycerol triacetate, and the lower floor is an ionic liquid phase. The yield is 98.0%), and the ionic liquid ...

Embodiment 2

[0019] Embodiment 2: 100g high acid value grease (acid value 15.0mgKOH / g), 69.1g methyl alcohol and 10.0g ionic liquid (3-sulfonic acid) propyltriethylammonium chloroferrate (wherein 3-sulfonic acid chloride The molar ratio of acid propyltriethylammonium salt to ferric chloride is 1:3), added into the autoclave, heated and stirred, and reacted at 140°C for 6h. After static cooling, the mixture was taken out and allowed to stand for layering and phase separation. The biodiesel in the upper layer was neutralized, washed with water and dehydrated to obtain 98.2 g of biodiesel (yield: 97.4%). The residue obtained after removing methanol and water from the lower ionic liquid phase is 1: 5.0 according to the molar ratio of glycerin and acetic acid, and toluene is used as the water-carrying agent. The by-product acetic acid is reclaimed under pressure, and the gained residue is allowed to stand for phase separation. The upper strata is glycerol triacetate, and the lower floor is an i...

Embodiment 3

[0021]Embodiment 3: 100g high acid value grease (acid value 12.5mgKOH / g), 42.2g methyl alcohol and 5.0g ionic liquid (3-sulfonic acid) propyltriethylammonium bromide ferrate (wherein 3-sulfonic acid chloride The molar ratio of acid propyltriethylammonium salt to ferric bromide is 1:2.5), added into the autoclave, heated and stirred, and reacted at 100°C for 10h. After static cooling, the mixture was taken out and allowed to stand for layering and phase separation. The upper layer of biodiesel was neutralized, washed with water and dehydrated to obtain 94.3 g of biodiesel (93.6% yield). The residue obtained after removing methanol and water from the lower ionic liquid phase is 1: 4.0 according to the molar ratio of glycerin and acetic acid, and toluene is used as the water-carrying agent. The by-product acetic acid is reclaimed under pressure, and the gained residue is allowed to stand for phase separation. The upper strata is glycerol triacetate, and the lower floor is an ioni...

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Abstract

The invention discloses a method for preparing biodiesel and co-producing triacetin, namely a method for preparing biodiesel and co-producing triacetin through catalyzing high-acid-value oil by adopting a dual-acid-type ion liquid by a 'one-pot' method. The method for preparing biodiesel and co-producing triacetin is characterized by comprising the following steps of: taking the dual-acid-type ion liquid formed by alkyl sulfonic acid functionalized acidity quaternary ammonium salt cationic and Lewis acidity inorganic anions as a catalyst, wherein free fatty acid in acid-catalyzed high-acid-value oil is subjected to esterification reaction, glyceride in acidity catalytic oil is subjected to ester exchange reaction so as to prepare biodiesel; and then reacting an ion liquid which is prepared by utilizing biodiesel and is separated automatically after reaction and a glycerol mixture with acetic acid, and co-producing triacetin. Compared with the prior art, 1. The selection range of raw material oil is much wide and economical; 2. The catalyst ion liquid has stable performances, has a good catalytic effect, and can be recycled; and the glycerol is high in utilization ratio, and the obtained product triacetin has high additional value.

Description

technical field [0001] The present invention involves the use of The bi-acid ionic liquid catalyzes the esterification and transesterification of high-acid value oils to prepare biodiesel, and adopts the method of co-producing the mixture of ionic liquid and glycerol that is separated after the preparation of biodiesel to prepare triacetin. A new method of esterification of free fatty acids and transesterification of glycerides to produce biodiesel and co-production of glycerol triacetate. Background technique [0002] Biodiesel is a high-quality clean energy. Compared with petroleum, it has the characteristics of high flash point, high cetane number, good lubricity, non-toxic, low content of volatile organic pollutants (VOC) and biodegradability. The production methods of biodiesel include direct mixing method, microemulsion method, high temperature pyrolysis method, transesterification method and biological method, among which transesterification method is one of the met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/02C11C3/04C11C3/10C07C69/18C07C67/08B01J31/02
CPCY02E50/13Y02E50/10
Inventor 刘仕伟于世涛李露解从霞刘福胜李可盛
Owner QINGDAO UNIV OF SCI & TECH
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