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Method for preparing biodiesel oil by using wet alga biomass microwave-heating one-step method

A technology of biodiesel and microwave heating, which is applied in the fields of biofuel, petroleum industry, fat production, etc., can solve the problems of energy consumption in dehydration and drying, and the production of biodiesel without in-depth analysis of microalgae cell wall breaking efficiency, so as to save energy consumption , The effect of simplifying the complex process

Active Publication Date: 2014-04-30
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

It is reported that one-step preparation of biodiesel by microwave heating treatment of dry algae biomass, using an alkaline catalyst (strontium oxide), about 99.9% of triglycerides were converted into biodiesel within 5 minutes (Koberg et al., 2011) , but the use of dry algae powder requires pre-dehydration and drying consumes a lot of energy
Patil et al. (2011) et al. adopted a one-step method of methanol extraction and transesterification of dry algae powder biomass by microwave heating to produce biodiesel, but did not analyze in depth the microalgae cell wall breaking efficiency and biodiesel yield and other indicators

Method used

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  • Method for preparing biodiesel oil by using wet alga biomass microwave-heating one-step method

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Effect test

Embodiment 1

[0032] Take rhizome liquid with a biomass density of 1g / L, and the oil content of the dry weight of the algae cells is 40%, and use the suction filtration method to dehydrate the microalgae liquid to obtain wet algae biomass with a solid water content of 60%. Weigh 1g of wet algal biomass into a centrifuge tube, add 4ml of chloroform and 4ml of methanol, and vibrate on a homogenizer for 20s. Then pour it into 4 microwave digestion tanks, each with a capacity of 50ml. Then add 0.2ml concentration of 98% concentrated sulfuric acid into the digestion tank, seal the digestion tank and put it into a microwave oven, the frequency of microwave treatment is 2450MHz. Set the microwave power to 500w for 40s, when the temperature of the microwave digestion tank reaches 60 degrees Celsius, reduce the microwave power to 400w and keep the temperature constant for 60min. After microwave treatment, cool for 10 minutes to reduce the temperature of the digestion tank to 30 degrees Celsius, and...

Embodiment 2

[0035] The chlorella liquid with a biomass density of 5g / L was taken, and the oil content of the dry weight of the algal cells was 70%, and the wet algae biomass with a solid water content of 40% was obtained after the microalgae liquid was dehydrated by a centrifugal method. Weigh about 50g of wet algae biomass into a centrifuge tube, add 50ml of chloroform and 50ml of methanol, and vibrate on a homogenizer for 30s. Then pour it into 7 microwave digestion tanks, each with a capacity of 170ml. Then add 2.5ml of concentrated sulfuric acid with a concentration of 98% in the digestion tank, seal the digestion tank and put it into a microwave oven. The frequency of microwave treatment is 2450MHz. Set the microwave power to 800w for 60s, when the temperature of the microwave digestion vessel reaches 80 degrees Celsius, reduce the microwave power to 500w and keep the temperature constant for 30min. After microwave treatment, cool for 15 minutes to reduce the temperature of the dige...

Embodiment 3

[0038] Take the spirulina liquid with a biomass density of 10g / L, the oil content of the dry weight of the algal cells is 10%, and use the filter press method to dehydrate the microalgae liquid to obtain wet algae biomass with a solid water content of 90%. Weigh 100g of wet algae biomass into a centrifuge tube, add 100ml of chloroform and 100ml of methanol, and vibrate on a homogenizer for 40s. Then pour it into 10 microwave digestion tanks, each with a capacity of 300ml. Then add 5ml of concentrated sulfuric acid with a concentration of 98% in the digestion tank, seal the digestion tank and put it into a microwave oven. The frequency of microwave treatment is 915MHz. Set the microwave power to 1000w for 80s, when the temperature of the microwave digestion tank reaches 90 degrees Celsius, reduce the microwave power to 600w and keep the temperature constant for 2min. Cool for 20 minutes after microwave treatment to reduce the temperature of the digestion tank to 25 degrees Cel...

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Abstract

The invention relates to biomass energy utilization technologies and aims at providing a method for preparing biodiesel oil by using a wet alga biomass microwave-heating one-step method. The method comprises the steps of filtrating or centrifuging micro-alga liquid, so as to obtain solid wet alga biomass with the moisture content of 40-90%; putting the wet alga biomass, chloroform, methanol and concentrated sulfuric acid into a microwave digestion tank, sealing, then, carrying out microwave treatment, and then, carrying out centrifugal extraction and purification on alga liquid, thereby obtaining a biodiesel oil product. According to the method, the enormous energy consumption during the traditional wet alga dry-dehydrating and grind-powdering processes is avoided, and the traditional complicated process flow that the biodiesel oil is prepared by a two-step method which comprises the steps of oil / grease extraction and transesterification is simplified; in addition, under the condition of microwave heating, wet alga cell walls are efficiently broken, and the cell-wall-broken oil / grease diffusion velocity is 152 times the wall-unbroken penetration wall passing velocity.

Description

technical field [0001] The invention relates to biomass energy utilization technology, in particular to a method for preparing biodiesel by one-step microwave heating of wet algae biomass. Background technique [0002] Algae is a huge amount of biomass energy. It is estimated that 1.46×10 11 tons of biomass, 40% of which is attributable to algae photosynthesis. Microalgae are rich in germplasm resources and contain high protein, oil and soluble polysaccharides. They have no leaves, stems and roots, and do not produce lignocellulosic refractory biomass. They do not compete with traditional agriculture for land and are not destroyed by harvesting. ecosystem. Because the quantum efficiency of microalgae converting solar energy into biomass energy is as high as 2-10%, while the quantum efficiency of terrestrial plants is less than 1%, and the growth rate of microalgae is extremely fast, and the daily biomass growth can reach 1-3 times , so the use of microalgal biomass conver...

Claims

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Application Information

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IPC IPC(8): C11B1/00C10L1/02
CPCY02E50/10
Inventor 程军岑可法周俊虎王智化杨卫娟张彦威刘建忠黄镇宇周志军
Owner ZHEJIANG UNIV
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