Method for preparing magnetic solid acid catalyst for production of biodiesel

A magnetic solid acid, biodiesel technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Conducive to homogenization, increased contact area, and good reusability

Inactive Publication Date: 2010-05-19
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the preparation technology of biodiesel is mainly based on the chemical method. The catalyst used in the chemical method is mainly liquid alkali, such as sodium methoxide or sodium hydroxide as the catalyst. Although the conversion efficiency is very high, as a homogeneous catalyst, it is very difficult to Difficult to separate it from the product
Another kind of catalyst uses liquid acid, such as concentrated sulfuric acid, as a catalyst to catalyze the transesterification reaction for the production of biodiesel, but the reaction speed of the acid catalyst is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the preparation of solid acid catalyst

[0012] three-neck flask Weigh 15g of zirconium oxychloride and FeCl 2 10g, mix and add 50ml distilled water to dissolve. Then add concentrated ammonia water dropwise to adjust the pH value to 8-9 (to alkaline), after standing for 12 hours, filter and collect the precipitate and wash it fully with distilled water until there is no Cl - Precipitation (use silver nitrate solution to detect, if there is no precipitation after mixing with silver nitrate solution, it is considered that there is no Cl - Precipitation), then impregnated with 40ml sulfuric acid solution (0.5mol / L) under constant stirring for 2 hours, dried and ground in a mortar, and then roasted at 500°C for 3 hours.

Embodiment 2

[0013] Embodiment 2: the effect of solid acid catalyst catalyzed esterification of oil

[0014] 14g of methanol, 15g of oleic acid and the solid acid catalyst prepared in 2g of Example 1 were loaded into the three-necked bottle device, and the esterification reaction was carried out at 70°C. After 3 hours of reaction, 14g of methyl oleate was obtained, and the conversion rate of esterification was 93.3 %.

Embodiment 3

[0015] Example 3: Catalytic preparation of biodiesel by using waste oil solid acid

[0016] 1. Collect a certain amount of waste oil. The waste oil can be any oil whose main component is long-chain fatty acid glyceride, such as soybean oil, palm oil, rapeseed oil, lard, tallow, fish oil and waste oil with long-chain fatty acid as main component.

[0017] 2. Pretreatment of waste oil

[0018] (1) Degumming: In a water bath at 70°C, add 0.1% phosphoric acid to dissociate the non-hydratable phospholipids, then cool to below 40°C, add 10% water to allow the phospholipids to stand or Centrifuge at low speed to pellet.

[0019] (2) Decolorization: add 5% activated carbon by weight of oil, oscillate and mix evenly, after standing still for 15-30 minutes, centrifuge to collect the supernatant.

[0020] (3) Anhydrous sodium sulfate was added to the sample to dry the sample, and then the supernatant was collected by centrifugation.

[0021] 3. Add a solid acid catalyst with 2% oil q...

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PUM

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Abstract

The invention discloses a method for preparing a magnetic solid acid catalyst for the production of biodiesel. The solid acid catalyst is prepared by performing sulfonic acid group modification on zirconia-based Fe3O4 / ZrO2 compound. The preparation method comprises the following steps: after mixing ferrous chloride and ferric chloride, adding ammonia water or solution of sodium hydroxide to adjust the pH value of the mixture to between 10 and 12; ageing the mixture for 2 hours; washing the mixture by distilled water to be neutral to obtain a magnetic substrate; mixing the magnetic substrate and zirconium oxychloride in proportion, adding a certain amount of water to fully dissolve the zirconium oxychloride, uniformly oscillating the mixed solution, adjusting the pH value of the mixed solution to between 10 and 12 by ammonia water or the solution of sodium hydroxide; filtering and precipitating after ageing for 2 hours; fully washing the precipitate by deionized water until no Cl- exists; fully soaking the precipitate for 4 hours by ammonium sulfate or solution of concentrated sulfuric acid or solution of ammonium persulphate; and leaching and roasting a filter cake in a muffle furnace at the temperature of 500 DEG for 3 hours to obtain the magnetic catalyst.

Description

technical field [0001] The invention relates to a preparation method of a magnetic solid acid catalyst used for biodiesel production, and belongs to the application field of oleochemical catalytic materials. Background technique [0002] At present, the preparation technology of biodiesel is mainly based on the chemical method. The catalyst used in the chemical method is mainly liquid alkali, such as sodium methoxide or sodium hydroxide as the catalyst. Although the conversion efficiency is very high, as a homogeneous catalyst, it is very difficult to Difficult to separate it from the product. Another kind of catalyst uses liquid acid, such as concentrated sulfuric acid, as a catalyst to catalyze the transesterification reaction for the production of biodiesel, but the reaction speed of the acid catalyst is slow. [0003] With the advancement of technology, many preparation methods of solid catalysts have also appeared. Due to their heterogeneous reaction characteristics, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C11C3/00
CPCY02E50/13Y02E50/10
Inventor 张搏
Owner GUANGXI ACAD OF SCI
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