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A homogeneous base-catalyzed method for rapid preparation of biofuels at normal temperature and pressure

A biofuel, alkali-catalyzed technology, applied in the direction of fat production, fatty acid esterification, fat oil/fat refining, etc., can solve the problems of high production energy consumption, slow reaction rate, etc., achieve short reaction time, mild conditions, and save consumption Effect

Inactive Publication Date: 2011-12-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of slow reaction rate and high production energy consumption due to the incompatibility of the reaction substrates existing in the existing biofuel preparation process. The present invention provides a homogeneous base catalyzed A method for rapidly preparing biofuels, by adding an appropriate solvent to make the preparation of short-chain alcohol fatty acid esters in a homogeneous system, which will greatly accelerate the reaction process due to the reaction between molecules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 5 g of Jatropha curcas seed oil with a water content of 3% and an acid value of 0.3 mg KOH / g and put it into a stoppered Erlenmeyer flask, and add cosolvent tetrahydrofuran, methanol and NaOH respectively. The consumption of solubilizer is 40% of the quality of Jatropha curcas seed oil, the molar ratio of methanol addition to Jatropha curcas seed oil is 3: 1, and the consumption of NaOH is 0.6% of the quality of Jatropha curcas seed oil. Mix evenly and place in a temperature-controlled reciprocating water-bath shaker, shake the reaction at a temperature of 30°C and a shaker speed of 50 rpm, and add 0.1 mol / L hydrochloric acid after reacting for 5 minutes to terminate the reaction.

[0021] Stand still for 25 minutes to separate the glycerol from the co-solvent in which the short-chain alcohol fatty acid ester is dissolved, and remove the glycerol. The remaining reaction mixture was subjected to rotary evaporation for 15 min at a temperature of 60° C. and a pressure...

Embodiment 2

[0023] Take 5g of sorbifolia oil with a water content of 2% and an acid value of 0.5mg KOH / g and put it into a stoppered Erlenmeyer flask, and add co-solvent n-hexane, methanol and KOH respectively. The amount of co-solvent is 25% of the mass of xanthana oil, the molar ratio of the amount of methanol added to the xanthan oil is 4.5:1, and the amount of KOH is 1% of the mass of xanthana oil. Mix evenly and place in a temperature-controlled reciprocating water-bath shaker, shake the reaction at a temperature of 25°C and a shaker speed of 50 rpm, and add 0.1 mol / L hydrochloric acid after reacting for 15 minutes to terminate the reaction. Stand still for 30 minutes to separate the glycerin from the co-solvent in which the short-chain alcohol fatty acid ester is dissolved, and remove the glycerin. The remaining reaction mixture was subjected to rotary evaporation for 15 min at a temperature of 60° C. and a pressure of 0.04 MPa to remove co-solvents and unreacted short-chain alcohol...

Embodiment 3

[0025] Take 5 g of rapeseed oil with a water content of 1% and an acid value of 1 mg KOH / g into a stoppered Erlenmeyer flask, and add co-solvents acetone, methanol and KOH respectively. The amount of co-solvent is 10% of the mass of rapeseed oil added, the molar ratio of the amount of methanol added to rapeseed oil is 4:1, and the amount of KOH is 3% of the mass of rapeseed oil. Mix evenly and place in a temperature-controlled reciprocating water-bath shaker, shake the reaction at a temperature of 25°C and a shaker speed of 50 rpm, and add 0.1 mol / L hydrochloric acid after reacting for 10 minutes to terminate the reaction. Stand still for 25 minutes to separate the glycerol from the co-solvent in which the short-chain alcohol fatty acid ester is dissolved, and remove the glycerin. The remaining reaction mixture was subjected to rotary evaporation for 20 min at a temperature of 60° C. and a pressure of 0.04 MPa to remove co-solvents and unreacted short-chain alcohols. The shor...

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Abstract

The invention is a homogeneous alkali-catalyzed method for rapidly preparing biofuel at normal temperature and pressure. The method comprises the following steps: taking the oil raw material, and then sequentially adding a cosolvent and a short-chain alcohol solution dissolved with an alkaline catalyst, wherein the amount of the co-solvent is 10% to 100% of the mass of the oil raw material, and the molar ratio is short-chain alcohol: oil = 3 to 4.5:1, the amount of basic catalyst is 0.5 to 5% of the mass of the oil raw material, placed in a temperature-controlled reciprocating water bath shaker, at a temperature of 20 to 30 ° C, and under low-speed oscillation conditions, the transesterification reaction is carried out for 5 to 15 minutes to obtain Biofuel, biofuel yield up to 99.4%. The preparation of the biofuel by the invention does not require high temperature and high pressure, high-speed stirring and excessive short-chain alcohol to promote the reaction, and the reaction between the oil and the short-chain alcohol can be completed within 15 minutes under the homogeneous condition. Not only the amount of short-chain alcohol and production energy consumption are saved, but also the reaction time is shortened and the production efficiency is improved.

Description

Technical field: [0001] The invention relates to the technical fields of oil chemical engineering and bioenergy, in particular to the technical field of biofuel preparation. Specifically, it is a homogeneous alkali-catalyzed method for rapidly preparing biofuels at normal temperature and pressure. Background technique: [0002] Research into biofuels has come a long way since the 1980s. With the development of industry and economy, the increasing demand for energy and the increasingly serious pollution caused by the use of fossil fuels have accelerated the pace of development of diesel alternative fuels around the world, and it is imperative to further develop renewable alternative energy . Especially in the 1990s, biodiesel, as a non-toxic, biodegradable, environment-friendly green fuel, has received more and more worldwide attention. Therefore, the research on the alternative energy-biofuel production process has great practical and strategic significance. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C11B3/00C10L1/02
Inventor 高静姜艳军
Owner HEBEI UNIV OF TECH
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