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Method for preparing biodiesel by grease continuity ester exchange and mixing cosolvent used in method

A technology of biodiesel and co-solvent, which is applied in the direction of biofuel, biological raw material, fatty acid esterification, etc., can solve the problems of high cost and difficult separation, and achieve the effect of safe use, easy separation and obvious effect

Inactive Publication Date: 2011-10-12
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at practical problems such as high cost and difficult separation of existing co-solvents, the present invention provides a method for preparing biodiesel by continuous transesterification of oil and the mixed co-solvent used, which has the advantages of low cost and easy separation.

Method used

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  • Method for preparing biodiesel by grease continuity ester exchange and mixing cosolvent used in method
  • Method for preparing biodiesel by grease continuity ester exchange and mixing cosolvent used in method
  • Method for preparing biodiesel by grease continuity ester exchange and mixing cosolvent used in method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Measure by volume percentage: 15% furfuryl alcohol, 75% butanone, and 10% n-hexane, mix them in a stirring tank, and stir at a speed of 90 rpm for 5 min to obtain a mixed co-solvent with a boiling point of 85.7°C;

[0026] Step 2: Take cottonseed oil and methanol as raw materials, KOH catalyst accounts for 1.0% of the oil mass, the alcohol-oil molar ratio is 27:1, and the co-solvent accounts for 15% of the methanol volume, mix them into a continuous tubular reactor, and control the reaction temperature at After reacting for 15 minutes at 60°C, the conversion rate of the product was measured to be 94.05%, and the kinematic viscosity (40°C) was 3.91mm 2 / s.

Embodiment 2

[0028] Step 1: Take according to the volume fraction: 15% furfuryl alcohol, 70% butanone, and 15% n-butane, mix them in a stirring tank, and stir at a speed of 90 rpm for 5 minutes to obtain a co-solvent with a boiling point of 83.2°C;

[0029] Step 2: Using soybean oil and methanol as raw materials, KOH catalyst accounts for 0.8% of the oil mass, the alcohol-oil molar ratio is 27:1, and the co-solvent accounts for 25% of the methanol volume, mix and add to the continuous tubular reactor, and control the reaction temperature at After reacting for 15 minutes at 60°C, the conversion rate of the product was measured to be 97.20%, and the kinematic viscosity (40°C) was 3.96mm 2 / s.

[0030] After GC / MS analysis, it can be known that the components corresponding to different retention times: The one with a retention time of 15.537min is methyl palmitate; The one with a retention time of 17.250min is methyl linoleate; The one with a retention time of 17.299min is methyl oleate...

Embodiment 3

[0032] Step 1: Take according to the volume fraction: 5% furfuryl alcohol, 85% acetone, and 10% isooctane, mix and place in a stirred tank, stir at a speed of 90 rpm for 5 min to obtain a co-solvent with a boiling point of 60.5°C;

[0033] Step 2: Rapeseed oil and methanol are used as raw materials, KOH catalyst accounts for 0.8% of the oil mass, the molar ratio of alcohol to oil is 25:1, and the co-solvent accounts for 26% of the methanol volume, mix and add to the continuous tubular reactor, and control the reaction temperature After reacting for 15 minutes at 60°C, the conversion rate of the product was measured to be 93.65%, and the kinematic viscosity (40°C) was 3.85mm 2 / s.

[0034] After GC / MS analysis, the components corresponding to different retention times can be obtained: The one with a retention time of 14.967min is methyl palmitate; The one with a retention time of 16.203min is methyl linoleate; The one with a retention time of 16.687min is methyl oleate; ...

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Abstract

The invention discloses a method for preparing biodiesel by grease continuity ester exchange and a mixing cosolvent used in the method. The mixing cosolvent comprises 50% to 90% butanone or acetone, and any one or both of 5% to 15% of furfuryl alcohol or 5% to 15% of C4 to C7 hydrocarbons by volume percent, wherein the sum of the volume percent of all the components is 100%. In the method for preparing the biodiesel by grease continuity ester exchange, the dosage of the mixing cosolvent is 5 to 30% of the volume of the lower alcohol. The cosolvent is mainly used for increasing the intersolubility of triglyceride and the low alcohol so that a homogeneous reaction system is formed, a reaction interface is increased, the reaction speed is accelerated and the continuity of the production process of the biodiesel is realized. The biodiesel has the advantages of moderate boiling point, easiness in recycling and moderate price.

Description

technical field [0001] The invention belongs to the technical field of green preparation of renewable energy, and in particular relates to a mixed co-solvent for continuous transesterification and a use method thereof. Background technique [0002] Biodiesel is a renewable oxygen-containing clean energy produced by transesterification or esterification of natural oils and methanol. A mature production process system has been formed. Among them, the batch-type base-catalyzed transesterification method is generally accepted by the modern biodiesel industry. kind of. Compared with acid catalysis, enzyme catalysis and other processes, the reaction time is relatively reduced, but still reaches more than 40min (Liu Ronghou, Cao Weixing, Huang Caixia. Optimization of process parameters for preparation of biodiesel by alkali-catalyzed transesterification of rapeseed oil. Journal of Agricultural Engineering, 2010, 6: 245-250). For the continuous process, due to the pipeline operati...

Claims

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Application Information

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IPC IPC(8): C11C3/10C10L1/02
CPCY02E50/10Y02P30/20
Inventor 陈洁蒋剑春聂小安常侠李科
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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