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Method for preparing biodiesel from oil with high acid value

A high-acid value grease and biodiesel technology, which is applied in biofuel, petroleum industry, liquid carbon-containing fuel, etc., can solve the problems of high acid value of pyrolysis oil, complex process, waste of raw materials, etc., and achieve low energy consumption and full reaction , the effect of reducing heat input

Inactive Publication Date: 2011-12-14
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of high acid value, low yield, complex process and serious waste of raw materials in the prior art, the present invention provides a method for preparing biodiesel from oil with high acid value, which has simple process and high acid value of the product fuel oil. Low, high product conversion rate

Method used

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  • Method for preparing biodiesel from oil with high acid value
  • Method for preparing biodiesel from oil with high acid value
  • Method for preparing biodiesel from oil with high acid value

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 5g of sodium carbonate catalyst in the reaction kettle, heat to 450°C, and the stirring speed is 220r / min; take 100g of waste oil (20mg KOH / g), drop into the reaction kettle through a constant flow pump at a speed of 50g / h, the After passing through the rectification column at 340°C, the generated steam is passed into the packed tower filled with formed acidic MCM-41 mesoporous molecular sieve, and reacts with methanol steam flowing in from the countercurrent. The temperature of the packed tower is kept at 120°C. After the top of the reaction packed tower is recovered and purified, it is heated by the heating device and then enters the countercurrent reaction packed tower for reaction. The acid value of the product after the countercurrent reaction packed tower is 2mg KOH / g, the yield is 80%, and the density is 0.82g / cm 3 , with a water content of 0.32%, a calorific value of 44.2kJ / g, and a viscosity of 2.7mm 2 / s, the cold filter point is -21°C, and the condensati...

Embodiment 2

[0028] Add 5g of sodium carbonate catalyst in the reaction kettle, heat to 450°C, and the stirring speed is 220r / min; take 100g of waste oil (20mg KOH / g), drop into the reaction kettle through a constant flow pump at a speed of 50g / h, the After passing through the 340°C rectification column, the generated steam is passed into the packed tower filled with acidic MCM-41 mesoporous molecular sieves, and reacts with the ethanol vapor flowing in the countercurrent, and the temperature of the packed tower is maintained at 120°C. The acid value of the product after passing through the countercurrent reaction packed tower is 3mg KOH / g, the yield is 77%, and the density is 0.81g / cm 3 , with a water content of 0.34%, a calorific value of 42.2kJ / g, and a viscosity of 2.8mm 2 / s, the cold filter point is -21°C, and the condensation point is -28°C.

Embodiment 3

[0030] Add 5g of sodium carbonate catalyst in the reaction kettle, heat to 450°C, and the stirring speed is 220r / min; take 100g of waste oil (20mg KOH / g), drop into the reaction kettle through a constant flow pump at a speed of 50g / h, the After passing through the 340°C rectification column, the generated steam is passed into the packed tower filled with acidic MCM-41 mesoporous molecular sieves, and reacts with the butanol vapor flowing in countercurrently. The temperature of the packed tower is kept at 120°C. The acid value of the product after passing through the countercurrent reaction packed tower is 3mg KOH / g, the yield is 81%, and the density is 0.83g / cm 3 , with a water content of 0.32%, a calorific value of 42.0kJ / g, and a viscosity of 2.8mm 2 / s, the cold filter point is -20°C, and the condensation point is -27°C.

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Abstract

The invention discloses a method for preparing biodiesel by high-acid value grease. The method comprises the following steps: dropwise adding plant or animal grease the acid value range of which is between 20 and 200mgKOH / g into a reaction kettle; carrying out catalytic cracking in a stirring state; adding sodium carbonate catalyst into the reaction kettle in advance, wherein the temperature in the reaction kettle is 450 DEG C; leading the generated cracking oil steam to pass through a rectifying column with the temperature of 320-360 DEG C and then charging the cracking oil steam into a reverse flow reaction packing tower from top to bottom; meanwhile, charging alcohol steam into the reverse flow reaction packing tower from bottom to top to carry out reverse flow reaction with the cracking oil steam; loading a bed layer of an acidic particle catalyst fixed bed into the reverse flow reaction packing tower with the temperature of 60-200 DEG C and obtaining the product biodiesel at the bottom of the reverse flow reaction packing tower. The product has the density of 0.80-0.86g / cm3, the water content of 0.31-0.39 percent, a heat value of 41.0-45.0kJ / g, the viscosity of 2.5-3.5mm2 / s, a cold filtering point of minus 8-minus 22 DEG C, a condensing point of minus 30-minus15 DEG C and an acid value of 1.0-5.0mgKOH / g. The method has simple process, low fuel acid value of the product and high conversion rate of the product.

Description

technical field [0001] The invention belongs to the technical field of biomass energy conversion, and mainly relates to the preparation of liquid fuel oil by pyrolysis-esterification of oil with high acid value. Background technique [0002] Biomass is the only renewable resource that can be directly converted to liquid fuel oil. At present, the method of preparing liquid fuel oil from oil is mainly to prepare biodiesel by transesterification. After years of development, a relatively complete technical system has been formed for the preparation of biodiesel. However, its further development is limited due to its own structural defects and the constraints of raw material costs. For example, biodiesel has a high condensation point and poor low-temperature fluidity, so it is not suitable for use in cold regions; its calorific value is also 9-13% lower than that of petrochemical diesel. In addition, biodiesel has poor storage stability, is prone to oxidation and deterioration,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L1/02
CPCY02E50/13Y02E50/10
Inventor 蒋剑春陈洁徐俊明
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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