Gas-liquid two-phase ester exchange reaction equipment and method for preparing biodiesel

A technology of transesterification and biodiesel, applied in the direction of biofuel, fatty acid esterification, etc., can solve the problems of low transesterification yield, long time consumption, high energy consumption, etc., and achieve the effect of improving efficiency

Inactive Publication Date: 2017-02-01
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the shortcomings of the prior art such as low transesterification yield, multi-stage reaction, high energy consumption, long time consumption and complicated process, the present invention provides a gas-liquid two-phase transesterification reaction equipment and a method for preparing biodiesel. The principle of the device is simple and the steps are integrated, which can achieve the purpose of high transesterification rate in one reaction

Method used

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  • Gas-liquid two-phase ester exchange reaction equipment and method for preparing biodiesel

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Experimental program
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Effect test

Embodiment 1

[0036] Raw materials: soybean oil, methanol, potassium hydroxide

[0037] Inject an appropriate amount of soybean oil and 0.8% by mass of potassium hydroxide catalyst into the reactor 3, raise the temperature to 100°C, start to inject methanol vapor from the lower end, and the temperature of the vaporizer 6 is 80°C. Sampling every half an hour, pay attention to observe the glycerin level in the glycerin separator, when it reaches the branch pipe, release an appropriate amount of glycerin; when the oil discharged from the lower end of the reactor meets the requirements, stop the methanol from entering and continue to heat and remove the reactor Methanol, open the discharge valve to obtain fatty acid methyl ester (biodiesel). The transesterification conversion rate of fats and oils was measured to reach 98.1%.

Embodiment 2

[0039] Raw materials: rapeseed oil, ethanol, sodium methoxide

[0040] An appropriate amount of rapeseed oil and 0.6% by mass sodium methoxide catalyst are injected into the reactor 3, the temperature is increased to 120°C, and ethanol vapor is injected from the lower end, and the temperature of the vaporizer 6 is 100°C. Sampling every half an hour, pay attention to observe the glycerol level in the glycerol separator, when it reaches the branch pipe, release an appropriate amount of glycerol; when the oil released from the lower end of the reactor meets the requirements, stop the ethanol from entering and continue to heat and remove the reactor Ethanol, open the discharge valve to obtain crude biodiesel product. The transesterification conversion rate of fat and oil was measured to reach 98.2%.

Embodiment 3

[0042] Raw materials: microbial grease, methanol, solid base catalyst

[0043] Into the reactor 3, an appropriate amount of microbial grease and 10% by mass of alkaline calcium bentonite supported sodium hydroxide catalyst are injected, the temperature is increased to 200°C, and methanol vapor is injected from the lower end, and the temperature of the vaporizer 6 is 80°C. Sampling every half an hour, pay attention to observe the glycerin level in the glycerin separator, when it reaches the branch pipe, release an appropriate amount of glycerin; when the oil discharged from the lower end of the reactor meets the requirements, stop the methanol from entering and continue to heat and remove the reactor Methanol, open the discharge valve to obtain fatty acid methyl ester (biodiesel). The transesterification conversion rate of fat and oil was measured to reach 95.1%.

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Abstract

The invention relates to gas-liquid two-phase ester exchange reaction equipment and a method for preparing biodiesel, and belongs to technologies of equipment and an application process thereof. A gas-liquid two-phase reactor is a heatable low-pressure-resisting device, and low-grade alcohol can have enough time to contact and react with liquid grease under relatively pressure when the temperature of the low-grade alcohol is higher than a boiling point thereof; a byproduct glycerol can be separated from a reaction system through a glycerol separator; furthermore, a mixing device for stirring, circulating and the like can be additionally arranged in the reactor according to specific requirements. Microorganism grease and an alkali catalyst are added into the tapered reactor; the tapered reactor is started to stir and the temperature is raised, so that the low-grade alcohol including methanol or ethanol and the like is enabled to be in a gas state in the tapered reactor, and the ester exchange conversion ratio of the grease is improved; an alcohol vaporizer guarantees gasification of the low-grade alcohol including the methanol or the ethanol and the like; a low-grade alcohol or ethanol gas inlet in the reactor is a gas distributor with a mesh shape, a pore shape and the like; the low-grade alcohol from the reactor is condensed and then can be repeatedly used. By adopting the method provided by the invention, the ester exchange conversion efficiency of the grease can be effectively improved through characteristics of a gas-liquid high-temperature reaction and effective separation of the byproduct.

Description

Technical field [0001] The invention relates to a gas-liquid two-phase transesterification reaction equipment and a method for preparing biodiesel, and relates to the technical fields of oleochemical utilization, biodiesel preparation and related equipment. Background technique [0002] It is well known that green, environmentally friendly and renewable biodiesel is a potential fuel to replace existing fuels and has a very broad application prospect. There are also many studies on its synthesis principles and equipment. At present, there are tank reactors and pipeline reactors that can be checked. , Trickle bed reactor, membrane reactor, two-phase countercurrent reactor, microchannel reactor, reactive distillation reactor, etc. [0003] Except for the traditional tank reactor, almost all other devices remain in the R&D or Chinese stage. The tank reactor is a general reactor. It has convenient feeding, simple operation and mature technology. However, the mass transfer is poor, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10
CPCC11C3/10Y02E50/10
Inventor 李科聂小安蒋剑春陈洁胡芳芳
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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