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Preparation method of activated rice husk ash and application of activated rice husk ash to purification of biodiesel

A technology of biodiesel and rice husk ash, applied in chemical instruments and methods, biofuels, petroleum industry, etc., can solve the problems of no mention of free glycerin purification, unactivated rice husk ash, limited adsorption capacity, etc., and achieve considerable Economic value, solving the problem of waste disposal, and easy operation

Inactive Publication Date: 2012-04-04
中兴能源(湖北)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The objects of its purification are mainly free fatty acids, phospholipids, carotene, sterols, proteins, amino acids and vitamins, and there is no mention of the purification of free glycerol
Moreover, the used rice husk ash has not been activated, and has a small specific surface area and limited adsorption capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 500g of rapeseed oil in a beaker, put it into a heat-collecting magnetic stirrer and preheat to 50°C. Measure anhydrous methanol according to the alcohol-oil molar ratio of 6:1, add 1% NaOH in oil weight, and stir well to completely dissolve NaOH. Then the methanol solution dissolved in NaOH was slowly added to the oil under stirring condition, and reacted for 1h. After the reaction was completed, the mixed solution in the beaker was transferred to a separatory funnel and left still. After the methyl ester layer and the glycerol layer in the separatory funnel were completely separated, the methyl ester layer was separated to obtain crude biodiesel (soap content was 2928ppm, and free glycerin content was 0.29%).

[0027] Rice husk ash was first soaked in 3mol / L hydrochloric acid for 2 hours; then washed with water until neutral and drained; fired at 550°C for 6 hours to obtain activated rice husk ash. The specific surface area of ​​rice husk ash before and after ...

Embodiment 2

[0030] Weigh 500g of soybean oil in a beaker, put it into a heat-collecting magnetic stirrer and preheat to 50°C. Measure anhydrous ethanol according to the alcohol-oil molar ratio of 6:1, add 1% NaOH in oil weight, and stir well to completely dissolve NaOH. Then the methanol solution dissolved in NaOH was slowly added to the oil under stirring condition, and reacted for 1h. After the reaction was completed, the mixed solution in the beaker was transferred to a separatory funnel and left still. After the ethyl ester layer and the glycerin layer in the separatory funnel were completely separated, the ethyl ester layer was separated to obtain crude biodiesel (soap content was 2588ppm, and free glycerin content was 0.25%).

[0031] Rice husk ash was first soaked in 3mol / L hydrochloric acid for 6 hours; then washed until neutral and drained; fired at 600°C for 6 hours to obtain activated rice husk ash. The specific surface area of ​​rice husk ash before and after activation is 1...

Embodiment 3

[0034] Weigh 500g of rapeseed oil in a beaker, put it into a heat-collecting magnetic stirrer and preheat to 50°C. Measure anhydrous methanol according to the alcohol-oil molar ratio of 6:1, add 1% NaOH in oil weight, and stir well to completely dissolve NaOH. Then the methanol solution dissolved in NaOH was slowly added to the oil under stirring condition, and reacted for 1h. After the reaction was completed, the mixed solution in the beaker was transferred to a separatory funnel and left still. After the methyl ester layer and the glycerol layer in the separatory funnel were completely separated, the methyl ester layer was separated to obtain crude biodiesel (soap content was 2928ppm, and free glycerin content was 0.29%).

[0035] Rice husk ash was first soaked in 3mol / L hydrochloric acid for 4 hours; then washed until neutral and drained; fired at 500°C for 3 hours to obtain activated rice husk ash. The specific surface area of ​​rice husk ash before and after activation ...

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Abstract

The invention discloses a preparation method of activated rice husk ash. The method comprises the following steps: 1) hydrochloric acid immersion: immersing the rice husk ash with 3mol / L hydrochloric acid for 2-6 h; 2) washing and draining: washing to neutral and draining; 3) high temperature treatment: sintering at 500-600 DEG C for 2-8 h to obtain the activated rice husk ash. The method of the invention is simple, and prepared activated rice husk ash has large specific surface area, strong adsorption capability and low cost. The invention also discloses application of the prepared activatedrice husk ash to purification of biodiesel. Applied to purification of biodiesel, the activated rice husk ash has advantages of simple equipment, easy operation, zero washing, waste water discharge reduction and environmental pollution reduction.

Description

technical field [0001] The invention belongs to the technical field of biochemical industry, and in particular relates to a preparation method of activated rice husk ash and its application in purifying biodiesel. Background technique [0002] At present, vegetable oil and animal fat are often used as raw materials to prepare biodiesel by homogeneous base-catalyzed transesterification. The method has the advantages of mild reaction conditions, shorter production time and higher yield. However, there are still some problems in the preparation of biodiesel by homogeneous base catalysis. For example, soap is produced during transesterification; especially when using raw materials with high free fatty acid content, glycerin, a by-product of transesterification, is also produced. When the biodiesel with residual soap and free glycerin burns, it will seriously affect the normal operation of the diesel engine, and even greatly shorten its working life. Therefore, biodiesel-relat...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C11B3/10C10L1/02
CPCY02E50/13Y02E50/10
Inventor 刘志祥曾祥林
Owner 中兴能源(湖北)有限公司
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