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Composite acid catalyst for esterification of biodiesel

A technology of biodiesel and catalyst, which is applied in the direction of physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, biofuel, etc. It can solve the problems of high cost, reduce the pressure of environmental protection, increase the treatment cost, The effect of reducing the cost of acid slag treatment

Inactive Publication Date: 2015-06-10
陕西合盛生物柴油技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the reaction process, sulfuric acid and raw oil will have a series of side reactions, which will carbonize or polymerize part of the raw oil into a colloidal substance, and a large amount of acid slag generated after the esterification reaction must be specially treated, which will cost a lot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Taking the preparation of 1000g of biodiesel esterification composite acid catalyst as an example, the raw materials used and their mass composition are as follows:

[0017] Methanesulfonic acid 943.4g

[0018] Phosphate monoester 56.6g

[0019] The preparation method is as follows: uniformly mix 943.4g methanesulfonic acid and 56.6g phosphoric acid monoester to prepare biodiesel esterification composite acid catalyst.

[0020] Take 1000g of gutter oil with an acid value of 125.4mgKOH / g, add 2.6g of biodiesel esterification compound acid catalyst, heat up to 60°C, then feed vaporized methanol into the reaction system, continue heating to 100°C, and perform esterification for 1 hour , to obtain the crude methyl ester with an acid value of 1.6 mgKOH / g.

Embodiment 2

[0022] Taking the preparation of 1000g of biodiesel esterification composite acid catalyst as an example, the raw materials used and their mass composition are as follows:

[0023] Methanesulfonic acid 990.1g

[0024] Phosphate monoester 9.9g

[0025] Its preparation method is identical with embodiment 1.

[0026] Take 1000g of gutter oil with an acid value of 146.8mgKOH / g, add 3.1g of biodiesel esterification compound acid catalyst, heat up to 60°C, then feed vaporized methanol into the reaction system, continue heating to 100°C, and perform esterification for 1 hour , to obtain the crude methyl ester with an acid value of 1.8 mgKOH / g.

Embodiment 3

[0028] Taking the preparation of 1000g of biodiesel esterification composite acid catalyst as an example, the raw materials used and their mass composition are as follows:

[0029] Methanesulfonic acid 909.1g

[0030] Phosphate monoester 90.9g

[0031] Its preparation method is identical with embodiment 1.

[0032] Take 1000g of gutter oil with an acid value of 146.8mgKOH / g, add 3.3g of biodiesel esterification compound acid catalyst, heat up to 60°C, then feed vaporized methanol into the reaction system, continue heating to 100°C, and perform esterification for 1 hour , to obtain the crude methyl ester with an acid value of 1.9 mgKOH / g.

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Abstract

The invention provides a composite acid catalyst for esterification of biodiesel. The composite acid catalyst consists of acid and an inhibitor in mass ratio of 1:(0.01-0.15), wherein the acid is methanesulfonic acid, ethanesulfonic acid or chlorosulfonic acid; the inhibitor is phosphomonoesterase, polyether acid phosphate or propargyl alcohol. The catalyst is applied to the esterification reaction of biodiesel, causes less dosage, has high catalyzing activity, does not produce other byproducts during the reaction, brings low requirement on material of equipment, and can be used for effectively solving the problems in esterification production of biodiesel that the catalyzing efficiency is relatively low, high requirements are brought to the materials of reactors and reaction equipment, and the products are difficult to separate.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, and in particular relates to a composite acid catalyst used for catalyzing the esterification reaction in the biodiesel production process. Background technique [0002] Most of the raw materials for domestic biodiesel production are waste oils (gutter oil, hog oil, acidified oil, etc.), which contain a large amount of free fatty acids. If the biodiesel is prepared directly by alkali catalysis for transesterification, the catalytic efficiency will be low and saponification The phenomenon is serious, and effective products cannot be obtained. Reducing the content of free fatty acids in raw oil is a necessary condition for biodiesel production, and the use of acid-catalyzed esterification is one of the most effective methods to reduce free fatty acids. The most commonly used esterification catalyst in actual production is sulfuric acid. Sulfuric acid has good catalytic activity, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J31/06C11C3/04
CPCY02E50/10
Inventor 申烨华陈邦李聪许龙何能德
Owner 陕西合盛生物柴油技术开发有限公司