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Method of preparing biological diesel oil catalyzed by solid base

A solid alkali catalyst and biodiesel technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of easy loss, serious pollution, and unfavorable recycling, so as to reduce water consumption and production costs , The effect of production cost reduction

Inactive Publication Date: 2007-08-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these catalysts have disadvantages such as long reaction time and short life.
[0005] At present, the method of preparing biodiesel for industrial application is to use homogeneous base catalysis such as NaOH, which has the disadvantages of complicated process, many post-processing steps, serious pollution and high cost.
Chinese patent CN 1724612A discloses a method for preparing biodiesel with organic bases, but the catalyst is easily dissolved into methanol and glycerol, resulting in catalyst loss, which is not conducive to recycling; Chinese patent CN 1664072A discloses a method for preparing biodiesel with solid alkali method, using γ-Al 2 o 3 After impregnated with NaOH, KOH, etc., the solid base catalyst is obtained after roasting. The active components such as Na and K are easily lost to methanol and by-product glycerin, which reduces the service life of the catalyst. However, MgO, CaO, etc. need special activation treatment to obtain Solid base catalyst; Chinese patent CN 1680514A discloses a solid base catalyst and its preparation method and application, the active components are Li, Na, K, Mg, Ca and other alkali metals and alkaline earth metals, in the form of solid particles of 0.8 to 400 microns Or supported on porous particles with a pore size of 0.6 nm to 400 microns, prepared by precipitation or sol-gel method
The preparation process needs to use a large amount of organic solvents, precipitants, etc., the preparation process is complicated, the dispersion effect is not good, the alcohol-oil ratio is large, and the biodiesel yield can only reach about 85%.

Method used

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  • Method of preparing biological diesel oil catalyzed by solid base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: use Sr(OCH 3 ) 2 Preparation of biodiesel with solid base catalyst

[0036] 1) join 24.2ml methanol in the slurry bed reactor of jacket, start to stir;

[0037] 2) Slowly add 1 gram of Sr(OCH 3 ) 2 solid base catalyst;

[0038] 3) add 50ml soybean oil in the reactor;

[0039] 4) Heating the reaction system to 40°C, the operating pressure is 0.1MPa;

[0040] 5) After reacting for 2 hours, the product is filtered through a filter to recover the catalyst;

[0041] 6) the product is passed into a vacuum distillation unit to reclaim unreacted methanol;

[0042] 7) The product after removing the methanol is passed into the clarification device to stand for stratification, and the glycerol in the lower layer is removed to obtain the biodiesel product, and the biodiesel yield is 95% through chromatographic analysis.

Embodiment 2

[0043] Embodiment 2: with Ca (OCH 3 ) 2 Preparation of biodiesel with solid base catalyst

[0044] 1) join 24.2ml methanol in the slurry bed reactor of jacket, start to stir;

[0045] 2) Slowly add 1 gram of Ca(OCH 3 ) 2 solid base catalyst;

[0046] 3) add 50ml soybean oil in the reactor;

[0047] 4) Heating the reaction system to 300°C, and the operating pressure is 30MPa;

[0048] 5) After reacting for 30 minutes, stop the reaction, and lower the temperature and release the pressure;

[0049] 6) The product is filtered through a filter to recover the catalyst;

[0050] 7) the product is passed into a vacuum distillation unit to reclaim unreacted methanol;

[0051] 8) The product after removing the methanol is passed into the clarification device to stand for stratification, and the glycerol in the lower layer is removed to obtain the biodiesel product, and the yield of the biodiesel is 95% through chromatographic analysis.

Embodiment 3

[0052] Embodiment 3: use Sr(OCH 3 ) 2 Preparation of biodiesel with solid base catalyst

[0053] 1) Methanol, soybean oil and Sr(OCH 3 ) 2 The catalyst is preheated to 250°C through the preheater;

[0054] 2) Pass the preheated reaction material into a tubular continuous reactor and react for 30 minutes;

[0055] 3) The reaction product is discharged through a pressure reducing valve;

[0056] 4) The product is filtered through a filter to recover the catalyst;

[0057] 5) the product is passed into a vacuum distillation unit to reclaim unreacted methanol;

[0058] 6) The product after removing the methanol is passed into the clarification device to stand for stratification, and the glycerol in the lower layer is removed to obtain the biodiesel product, and the biodiesel yield is 95% through chromatographic analysis.

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Abstract

The invention discloses a making method of biological diesel catalyzed by solid alkaline, which comprises the following steps: adding alcohol into reactor; adding one or more of Mg (OCH3)2, Ca (OCH3)2 and Sr (OCH3)2 as solid alkaline catalyst; adopting alumina, silica or honeycomb ceramics as carrier to prepare solid alkaline catalyst; or reacting primer of catalyst and corresponding alcohol to make catalyst; or adding consolute agent and alcohol material into reactor; adding fat into reactor; heating; starting catalytic reaction; decompressing; filtering; laminating; obtaining the product and rough glycerine.

Description

technical field [0001] The invention relates to a method for preparing biodiesel with solid base catalysis, in particular to a method for preparing biodiesel by using a solid base catalyst as an alkaline earth metal alkoxide compound formed after the reaction of an alkaline earth metal or an alkaline earth metal oxide with an alcohol. The solid base catalyst can The invention relates to preparing biodiesel by effectively catalyzing transesterification reaction, and belongs to the technical field of biodiesel chemical engineering. Background technique [0002] Biodiesel refers to long-chain fatty acid methyl esters obtained through transesterification with renewable animal and vegetable oils as raw materials. It is an environmentally friendly fuel that can replace ordinary diesel. Its raw materials mainly come from renewable resources such as soybean oil, rapeseed oil, animal oil, and waste oil from the catering industry. The energy efficiency of biodiesel is similar to that...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 朱慎林刘学军朴香兰王玉军
Owner TSINGHUA UNIV
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