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Method for preparing biodiesel from triglycerides catalyzed by nano-hydroxyapatite

A technology for catalyzing triglyceride and biodiesel by hydroxyapatite is applied in the petroleum industry, biofuel, fatty acid esterification, etc. The effect of catalytic activity and stability, high product purity, and low dosage

Inactive Publication Date: 2015-08-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct mixing process is simple, but carbonization and coking will occur in long-term use
The microemulsion method is easily restricted by environmental conditions. Changes in environmental conditions will cause the occurrence of demulsification, which will make the properties of the fuel unstable and cannot achieve the purpose of universal use.

Method used

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  • Method for preparing biodiesel from triglycerides catalyzed by nano-hydroxyapatite
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  • Method for preparing biodiesel from triglycerides catalyzed by nano-hydroxyapatite

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Catalyst preparation:

[0020] In the presence of organic modifier polyvinylpyrrolidone, calcium nitrate and phosphoric acid were used as raw materials to prepare rod-shaped nano-hydroxyapatite by a combination of precipitation and hydrothermal methods. At room temperature, a concentration of 1.0 mol / L Ca(NO 3 ) 2 4H 2 O and 0.6 mol / L H 3 PO 4 Aqueous solution, according to the ratio that Ca / P is 1.67 (molar ratio), join in the 250 ml three-necked flask and mix, place the three-necked flask in the constant temperature water bath, under stirring, the aqueous solution (0.015 mol / L, 20ml) was added to the above reaction solution, and then NH 3 ·H 2 O, the pH value of the reaction solution was adjusted to 7, and the obtained suspension was stirred and reacted at 25° C. for 2 h. Then the reaction solution was transferred into a hydrothermal reactor and reacted at 80 °C for 8 h. After the reaction, the obtained milky white precipitate was washed with distilled water ...

Embodiment 2

[0027] Same as Example 1, only change the mass ratio (raw material ratio) of triglyceride to methanol: 1:20, 1:30, 1:40, and carry out triglyceride transesterification reaction. The product selectivity and conversion of raw materials are shown in Table 1.

[0028] Table 1 Under normal pressure, the reaction temperature is 80 ℃, and the reaction time is 2 hours under heat preservation. The selectivity of nano-hydroxyapatite-catalyzed triglyceride transesterification reaction product biodiesel and the conversion rate of raw materials are different when the ratio of raw materials is different.

[0029]

Embodiment 3

[0031] Same as Example 1, only changing the temperature of the reactor during the triglyceride transesterification reaction to 100°C, 140°C, 200°C, and 300°C respectively, and performing the triglyceride transesterification reaction, the obtained results are shown in Table 2.

[0032] Table 2 Under normal pressure, when the mass ratio of raw materials is 1:10, the selectivity of nano-hydroxyapatite-catalyzed triglyceride transesterification reaction product biodiesel and the conversion rate of raw materials at different reaction temperatures and under heat preservation for 2 hours.

[0033]

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Abstract

The invention relates to a method for preparing biodiesel by using nano hydroxyapatite to catalyze triglyceride. The method comprises the following steps: using triglyceride and methanol as raw materials, adopting nano hydroxyapatite as a solid alkali catalyst, using 0.5-3 wt% of the catalyst, increasing the reaction temperature to 80-300 DEG C under normal pressure, and conducting thermal reaction for 2-10 h; after the reaction is finished, filtering out the catalyst, and obtaining the biodiesel through extraction and still standing. The nano hydroxyapatite catalyst prepared by the invention is rodlike and spherical particles and has high catalytic activity and stability, and the dosage of the nano hydroxyapatite catalyst is small. The method has simple process requirements and meets industrialization requirements.

Description

technical field [0001] The invention relates to a method for preparing biodiesel from triglyceride catalyzed by nano-hydroxyapatite, which belongs to the field of biomass new energy. Background technique [0002] Biodiesel is non-toxic, degradable and environmentally friendly. It promotes energy substitution and reduces environmental pressure. It is of great significance to solve the non-renewable fossil energy and the environmental problems caused by fossil fuels. [0003] At present, the main methods for preparing biodiesel are direct mixing method, microemulsion method, thermal cracking method and transesterification method. The direct mixing process is simple, but carbonization and coking will occur in long-term use. The microemulsion method is easily limited by environmental conditions, and changes in environmental conditions will cause the occurrence of demulsification, which will make the properties of the fuel unstable and cannot achieve the purpose of general us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/10
Inventor 王爱丽殷恒波冯永海沈灵沁季玉琴
Owner JIANGSU UNIV