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Method for producing wet microalgae biodiesel through calcining shells into lime under assistance of ultrasonic wave

A technology for calcining lime and microalgae organisms, which is applied in the fields of biofuels, petroleum industry, fat oil/fat refining, etc., can solve the problems of little processing and utilization of shell parts, environmental pollution, environmental pollution, etc., so as to reduce production costs and improve extraction. rate, the effect of reducing the amount of addition

Inactive Publication Date: 2015-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current use of shellfish in my country is only limited to the edible part, and the shells that account for more than 60% of the mass of shellfish are rarely processed and utilized. has become a major environmental hazard

Method used

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  • Method for producing wet microalgae biodiesel through calcining shells into lime under assistance of ultrasonic wave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Grind 5 g of discarded mussel shells into powder and calcinate at 900 °C for 4 h in an air atmosphere to obtain lime powder. Add 10g Scenedesmus wets (80% water content) into 40ml chloroform / methanol organic solution (volume ratio 1:1), raise the temperature to 60°C, and act on it at an ultrasonic frequency of 20kHz and a sound energy density of 0.4 W / ml After 1 hour, the algae residue was separated by centrifugation, the liquid phase was allowed to stand for stratification, and the upper layer of the liquid phase was taken to obtain an organic solution containing oil. Add 0.5g of lime into the oil-containing organic solution, set the reaction temperature at 60°C, and act for 1 hour at an ultrasonic frequency of 20kHz and a sound energy density of 0.4 W / ml, then centrifuge the lime and recover it for reuse. The organic solution was removed from the liquid phase by distillation to obtain 0.51 g of crude biodiesel product.

Embodiment 2

[0026] Grind 5 g of discarded mussel shells into powder and calcinate at 900 °C for 4 h in an air atmosphere to obtain lime powder. Add 10g Scenedesmus wets (80% water content) into 50ml chloroform / methanol organic solution (volume ratio 1:1), raise the temperature to 80°C, and act on it at an ultrasonic frequency of 20kHz and a sound energy density of 0.4 W / ml After 0.7 h, the algae residue was separated by centrifugation, the liquid phase was allowed to stand for stratification, and the upper layer of the liquid phase was taken to obtain an organic solution containing oil. Add 0.6g of lime into the oil-containing organic solution, set the reaction temperature to 80°C, and act for 1 hour at an ultrasonic frequency of 20kHz and a sound energy density of 0.4 W / ml, then centrifuge the lime and recover it for reuse. The organic solution was removed from the liquid phase by distillation to obtain 0.63 g of crude biodiesel product.

Embodiment 3

[0028] Grind 5 g of discarded mussel shells into powder and calcinate at 900 °C for 4 h in an air atmosphere to obtain lime powder. Add 10g Scenedesmus hygroides (water content 80%) and 0.6g lime into 50ml chloroform / methanol organic solution (volume ratio 1:1), raise the temperature to 70°C, set the ultrasonic frequency at 20kHz, and the sound energy density at 0.4 W After 1.5 hours of action at the concentration of 1.0 / ml, the algae residue and lime were separated by centrifugation, and the lime was not recovered. The liquid phase was allowed to stand for stratification, and the upper layer of the liquid phase was taken to obtain an organic solution containing biodiesel, and the organic solution was removed by distillation to obtain 0.72 g of crude biodiesel product.

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Abstract

The invention discloses a method for producing wet microalgae biodiesel through calcining shells into lime under the assistance of ultrasonic wave. The method comprises the following steps: taking oily microalgae as a raw material; taking lime powder as a catalyst, adding the microalgae into an organic solution, cracking under the assistance of ultrasonic wave and centrifuging to obtain an greasy organic solution; adding the lime into the greasy organic solution, carrying out emulsification under the assistance of ultrasonic wave and carrying out transesterification; recycling the lime under the centrifugal action; distilling the organic solution containing biodiesel to obtain the biodiesel and recycling the organic solution. The wet microalgae biodiesel production method has the advantages that on one hand, the shell calcined lime is taken as the catalyst to realize the waste resource utilization, and meanwhile, as the lime can be recycled, and the raw material is the wet microalgae, the energy consumption required by drying is eliminated; on the other hand, ultrasonic waves not only play roles in damaging cells at the oil extraction stage and improving the oil extraction rate, but also plays an emulsifying role at the transesterification stage, so that the adding amount of the organic solution and the catalyst is reduced.

Description

technical field [0001] The invention belongs to the technical field of biochemistry, and in particular relates to a method for preparing wet microalgae biodiesel by ultrasonic-assisted calcining lime from shells. Background technique [0002] With the rapid development of society, human beings are increasingly dependent on oil, and the balance between oil supply and consumption restricts the economic development of various countries and even the world. At present, the global oil resources are gradually decreasing and are facing a crisis of depletion. Therefore, vigorously developing renewable clean fuels has important strategic significance and is also an inevitable trend. Biodiesel is a renewable energy product worthy of large-scale promotion in the future, and it is also an important development field of my country's energy strategy. At present, the main raw materials used to produce biodiesel are palm, soybean, rapeseed and other oil plants and food crops, and edible wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B1/10C11C3/10C11C1/10C10L1/02
CPCC10L1/02C11B1/106C11B3/12C11C3/10Y02E50/10
Inventor 马晓茜彭晓为许志斌林有胜
Owner SOUTH CHINA UNIV OF TECH
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