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A process for preparing biodiesel from soy sauce residues through an extraction-interesterification one-pot manner in a supercritical carbon dioxide system

A carbon dioxide and biodiesel technology, applied in biofuels, petroleum industry, fat oil/fat production, etc., can solve the problems of inapplicable enzymes, high acid value, etc., and achieve the effects of reducing processing costs, high diesel purity, and speeding up the reaction rate

Active Publication Date: 2018-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the biological method is used, the high acid value and highly corrupted oils are not suitable for the development of enzymes

Method used

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  • A process for preparing biodiesel from soy sauce residues through an extraction-interesterification one-pot manner in a supercritical carbon dioxide system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The soy sauce residue is used as raw material to prepare biodiesel in a supercritical carbon dioxide system by extraction-esterification one-pot method, which specifically includes the following steps:

[0041] (1) The raw material of soy sauce residue is sterilized by autoclaving, washed with deionized water, dried in vacuum, pulverized by a pulverizer to obtain the raw material of soy sauce residue powder;

[0042] (2) In a 1L supercritical carbon dioxide reactor, add 145g of soy sauce residue powder and 100ml of methanol, tightly cover the lid, and replace the air in the reactor with carbon dioxide for 4 times;

[0043] (3) Start the carbon dioxide reaction kettle, set the reaction temperature to 40° C., and the reaction pressure to 8 MPa. After reaching the set value, keep the temperature constant for 3 hours;

[0044](4) The reaction is terminated, wait for the reactor to be cooled to normal temperature, empty the carbon dioxide, open the kettle cover, take out th...

Embodiment 2

[0047] The soy sauce residue is used as raw material to prepare biodiesel in a supercritical carbon dioxide system by extraction-esterification one-pot method, which specifically includes the following steps:

[0048] (1) The raw material of soy sauce residue is sterilized by autoclaving, washed with deionized water, dried in vacuum, pulverized by a pulverizer to obtain the raw material of soy sauce residue powder;

[0049] (2) In a 1L supercritical carbon dioxide reactor, add 185g of soy sauce residue powder and 139ml of methanol, tightly cover the lid, and replace the air in the reactor with carbon dioxide for 4 times;

[0050] (3) Start the carbon dioxide reaction kettle, set the reaction temperature to 60°C, and the reaction pressure to 10MPa. After reaching the set value, keep the temperature constant for 3 hours;

[0051] (4) The reaction is terminated, wait for the reactor to be cooled to normal temperature, empty the carbon dioxide, open the kettle cover, take out the ...

Embodiment 3

[0054] The soy sauce residue is used as raw material to prepare biodiesel in a supercritical carbon dioxide system by extraction-esterification one-pot method, which specifically includes the following steps:

[0055] (1) The raw material of soy sauce residue is sterilized by autoclaving, washed with deionized water, dried in vacuum, pulverized by a pulverizer to obtain the raw material of soy sauce residue powder;

[0056] (2) In a 1L supercritical carbon dioxide reactor, add 206g of soy sauce residue powder and 155ml of methanol, tightly cover the lid, and replace the air in the reactor with carbon dioxide for 4 times;

[0057] (3) Start the carbon dioxide reaction kettle, set the reaction temperature to 80°C, and the reaction pressure to 12MPa. After reaching the set value, keep the temperature constant for 3 hours;

[0058] (4) The reaction is terminated, wait for the reactor to be cooled to normal temperature, empty the carbon dioxide, open the kettle cover, take out the ...

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Abstract

A process for preparing biodiesel from soy sauce residues through an extraction-interesterification one-pot manner in a supercritical carbon dioxide system is disclosed. The process includes (1) subjecting a soy sauce residue raw material to sterilization, cleaning, drying and crushing to obtain soy sauce residue powder; (2) adding the soy sauce residue powder and short-chain alcohol into a supercritical reaction kettle, checking gas tightness and replacing air in the kettle with carbon dioxide; (3) starting the supercritical reaction kettle, setting reaction parameters through a control panel, and performing a reaction after the parameters are stabilized; (4) after the reaction is finished, closing the supercritical reaction kettle, cooling to room temperature, and discharging the carbondioxide through a vent valve; and (5) filtering a mixture after the reaction, allowing a liquid-phase product to stand until layering is generated, separating a biodiesel phase from a glycerol phase,and subjecting the separated biodiesel phase to rotary evaporation to obtain the biodiesel. The process avoids use of catalysts, and has advantages of a low cost, a simple process, easy product separation and environment protection.

Description

technical field [0001] The invention relates to the technical field of biodiesel preparation, in particular to a process for preparing biodiesel by using soy sauce residue as a raw material in a supercritical carbon dioxide system for extraction and transesterification in one pot. Background technique [0002] At present, due to the excessive exploitation and utilization of fossil fuels such as coal and oil, a series of problems such as the depletion of fossil fuels, global warming, environmental pollution, and ecological damage have been caused. Now, energy and environmental issues have become major challenges facing human society. To realize the harmonious coexistence between man and nature and to seek renewable, environmentally friendly and clean energy has attracted widespread attention from scholars from all over the world. When countries around the world develop new energy, the first consideration is whether the energy is environmentally friendly, and secondly, whether...

Claims

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Application Information

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IPC IPC(8): C10L1/02C11B13/00C11B1/02C11B1/10C11C3/10C11B3/12
CPCC10L1/02C11B1/02C11B1/104C11B3/12C11B13/00C11C3/10Y02E50/10Y02W30/74
Inventor 常杰向程刘思语付严
Owner SOUTH CHINA UNIV OF TECH