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Improved process for reducing acid value of drainage oil by virtue of supercritical method

A waste oleic acid and supercritical technology, which is applied in the petroleum industry, fatty acid esterification, liquid carbon-containing fuel, etc., can solve the problems of high production cost and waste discharge

Active Publication Date: 2015-04-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the existing waste oil acid reduction technology, whether it is industrial technology, pilot technology or laboratory research technology, has some defec

Method used

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  • Improved process for reducing acid value of drainage oil by virtue of supercritical method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 150g of waste oil with an acid value of 115.0mg KOH / g in a pressure reactor, start to heat up, and when the reaction temperature reaches 230°C, use a pump to pump in methanol with a flow rate of 5mL / min, and release methanol and water vapor through control Keep the pressure in the kettle at about 0.3MPa. After 45 minutes of esterification and dehydration reaction, the acid value of waste oil can be reduced to 2.62mg KOH / g. During the deacidification process of waste oil, the excess methanol vapor and the water vapor generated by the reaction can be directly purified through rectification to recover methanol with very little waste emissions.

Embodiment 2

[0016] Weigh 150g of waste oil with an acid value of 115.0mg KOH / g in a pressure reactor, start to heat up, and when the reaction temperature reaches 230°C, use a pump to pump in methanol with a flow rate of 5mL / min, and release methanol and water vapor through control Keep the pressure in the kettle at about 0.8MPa. After 45 minutes of esterification and dehydration reaction, the acid value of waste oil can be reduced to 5.23mg KOH / g. During the deacidification process of waste oil, the excess methanol vapor and the water vapor generated by the reaction can be directly purified through rectification to recover methanol with very little waste emissions.

Embodiment 3

[0018] Weigh 150 g of waste oil with an acid value of 115 mg KOH / g in a pressure reactor, start to heat up, and when the reaction temperature reaches 230° C., use a pump to pump in methanol with a flow rate of 5 mL / min. Speed, keep the pressure in the kettle at about 0.6MPa. After 45 minutes of esterification and dehydration reaction, the acid value of waste oil can be reduced to 1.65mg KOH / g. During the deacidification process of waste oil, the excess methanol vapor and the water vapor generated by the reaction can be directly purified through rectification to recover methanol with very little waste emissions.

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Abstract

The invention discloses an improved process for reducing the acid value of drainage oil by virtue of a supercritical method and belongs to the field of biomass energies. The improved process comprises the following steps: continuously and directly introducing methanol into drainage oil which is not dehydrated at 180-230 DEG C; carrying out esterification reaction at 0.3-0.8MPa and immediately and continuously removing unreated methanol steam and water generated by esterification reaction; and in the technical process and under the process condition, esterifying and dehydrating for 30-60 minutes so as to reduce the acid value of the drainage oil to below 2.0mgKOH/g. Under the process condition, not only is the acid value of the drainage oil reduced to below 2.0mgKOH/g, but also the generated wastes are extremely few, and the drainage oil with the acid value of 2.0mg KOH/g can be directly used as a raw material for transesterification in the next step. The process has the advantages of safety, efficiency, environmental protection, energy conservation and no corrosion and can be used for continuous production.

Description

technical field [0001] The invention belongs to the field of biomass energy, in particular to an improved method for reducing the acid value of waste oil by a supercritical method. Background technique [0002] Waste oil is a general term for waste animal fat, swill oil, repeated heating and use, and garbage oil collected from the sewer of catering enterprises. Waste oil undergoes complex biochemical reactions in water bodies, producing a series of complex aldehydes, acids and other odorous substances, polluting the atmosphere, deteriorating the living environment, and seriously endangering human health. First of all, the development of waste oil as a raw material for biodiesel production and the recycling of waste is the most important way to solve the hazards of waste oil and comprehensive utilization of resources. [0003] The waste oil directly recovered from the market, because it contains more fatty acids, generally has a relatively high acid value, around 80.0-120.0m...

Claims

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Application Information

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IPC IPC(8): C11C3/04C11C3/10C10L1/02
CPCC10L1/02C11C3/04C11C3/10
Inventor 宋国强吕小兵冯筱晴曹引梅秦枫
Owner CHANGZHOU UNIV