Solid base catalyst for preparing biodiesel

A solid base catalyst, biodiesel technology, applied in the direction of physical/chemical process catalyst, catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, etc., to achieve the effect of simple preparation process

Inactive Publication Date: 2009-07-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, a kind of solid alkali catalyst with simple preparation process for preparing biodiesel is now proposed, which effectively solves the above problems, and there are no reports at home and abroad at present.

Method used

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  • Solid base catalyst for preparing biodiesel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation of solid base catalyst: with 0.36 moles (88.7 grams) MgSO 4 ·7H 2 O and 0.1125 mol (74.9 g) Al 2 (SO 4 ) 3 18H 2 O was dissolved in 315 ml of tap water to form a mixed salt solution, and 0.936 moles (37.4 grams) of NaOH and 0.45 moles (47.7 grams) of NaOH 2 CO 3 Dissolve in 315 ml of tap water to form a mixed alkali solution. Under full stirring, add the salt solution and alkali solution dropwise to 50 ml of tap water at the same time, at a rate of 15 ml / min. After the addition is complete, heat up to 80°C to crystallize Hours, a white precipitate was generated, which was separated by centrifugation, and the separated product was washed with tap water and dried at 90°C to obtain a hydrotalcite with a magnesium-aluminum ratio of 1.6:1: Mg 0.62 al 0.38 (OH) 2 (CO 3 ) 0.19 4H 2 O.

[0017] Preparation of biodiesel: 10g soybean oil and 30g methanol are added to the there-necked flask, and then 0.1g of magnesium aluminum hydrotalcite catalyst Mg ...

Embodiment 2

[0019] The preparation of solid base catalyst: with 0.36 moles (92.3 grams) Mg(NO 3 ) 2 ·6H 2 O and 0.12 mol (45.0 g) Al(NO 3 ) 3 9H 2 O was dissolved in 1000 ml of tap water to form a mixed salt solution, and 0.936 moles (52.4 grams) of KOH and 0.45 moles (62.1 grams) of KOH 2 CO 3 Dissolve in 235ml of tap water to make a mixed alkali solution. Under full stirring, add the alkali solution dropwise into the salt solution at a rate of 30ml / min. After the addition is complete, heat up to 60°C to crystallize for 6 hours, forming a white precipitate , filtered with a funnel, and the separated product was washed with tap water and dried at 80°C to obtain a hydrotalcite with a magnesium-aluminum ratio of 3:1:Mg 0.75 al 0.25 (OH) 2 (CO 3 ) 0.125 ·5H 2 O.

[0020] Preparation of biodiesel: 10g rapeseed oil and 80g ethanol are added to the there-necked flask, and then 0.2g of magnesium aluminum hydrotalcite catalyst Mg 0.75 al 0.25 (OH) 2 (CO3 ) 0.125 ·5H 2 O, the reac...

Embodiment 3

[0022] The preparation of solid base catalyst: with 0.36 moles (34.2 grams) MgCl 2 and 0.036 moles (4.8 grams) of AlCl 3 Dissolved in 315 ml of tap water to form a mixed salt solution, 0.18 moles (17.3 g) (NH 4 ) 2 CO 3 Dissolve in 100ml of tap water and 215ml of 25% ammonia water to form a mixed alkaline solution. Pour the salt solution into the alkaline solution under full stirring, and then heat up at 40°C to crystallize for 10 hours to form a white precipitate. Draw it out with a funnel filtered, the separated product was washed with tap water, and dried at 100°C to obtain a hydrotalcite with a magnesium-aluminum ratio of 10:1::Mg 0.91 al 0.09 (OH) 2 (CO 3 ) 0.045 ·6H 2 O.

[0023] Preparation of biodiesel: 10g rapeseed oil and 150g propanol are added to the there-necked flask, and then 0.4g of magnesium aluminum hydrotalcite catalyst Mg 0.91 al 0.09 (OH) 2 (CO 3 ) 0.045 ·6H 2 O, the reaction was stirred at 97°C for 2 hours. After the reaction is finished, ...

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PUM

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Abstract

The invention discloses a solid base catalyst for preparing bio-diesel oil. The solid base catalyst is an anionic layered compound--hydrotalcite-like compound with controllable components. The solid base catalyst of the invention has simple preparation technology, high catalytic activity during the ester exchange reaction between the grease and the short-chain alcohol to synthesize the bio-diesel oil and high yield of the bio-diesel oil and can reuse the catalyst. The solid base catalyst solves the problems such as complexity of the catalyst preparation technology in the prior art and energy consumption, etc.

Description

technical field [0001] The invention relates to a solid base catalyst, in particular to a solid base catalyst for preparing biodiesel, and belongs to the field of catalysts. Background technique [0002] With the development of the world economy, the existing crude oil resources can no longer meet the growing demand. Biodiesel produced from natural oils and fats is a substitute for high-quality petroleum fuels. It has the advantages of renewable, easy biodegradation, non-toxic, low sulfur content and small emissions of harmful substances in exhaust gas, and is an environmentally friendly fuel. At present, it has been widely concerned by countries all over the world. [0003] Vegetable oil, animal oil, waste cooking oil, etc. are used as raw materials to carry out transesterification reaction with alcohol (short-chain alcohol such as methanol and ethanol), and the product is biodiesel (fatty acid ester), and the by-product is glycerin. Most of the existing industrial produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/236B01J27/053B01J31/04B01J37/03C10G3/00
Inventor 矫庆泽何杨陈魁刘小可孙冲波曾超群赵芸
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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