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Biodiesel preparing method

A biodiesel and oil technology, which is applied in the fields of biofuel, petroleum industry, liquid carbon-containing fuel, etc., can solve the problems that the acid value of esterification cannot be reduced in a short time, the transesterification becomes too much soap, and the consumption of alcohol is high. Low cost, high product yield and low alcohol consumption

Inactive Publication Date: 2016-05-25
SHANDONG TAIDE NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid-base two-step catalytic method is used by most enterprises to prepare biodiesel, but there are the following problems in the production: the acid value of esterification cannot be reduced in a short time, more soap is formed by transesterification, high alcohol consumption, and low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 1000g of catering waste oil with an acid value of 120mgKOH / g into the reactor, add 100g of water, start stirring, raise the temperature to 70°C, stir for 10 minutes, add 1g of phosphoric acid, continue stirring for 90 minutes, stop stirring, cool and centrifuge , take the oil phase for subsequent use;

[0020] (2) Add the oil phase to the reactor, add 50g of methanol, 141g of dimethyl carbonate, and 10g of p-toluenesulfonic acid, heat up to 60-80°C, keep reflux, and take samples every 30 minutes to measure the acid value;

[0021] (3) When the acid value is less than 2.0mgKOH / g oil, cool to 30°C, add 5g of sodium methoxide, stir for 30 minutes, add 200g of methanol, 5g of tetrabutylammonium bromide, stir and raise the temperature to 60-80°C, keep reflux 10 minutes;

[0022] (4) Change vacuum distillation device, 60~80 ℃ vacuum distillation, reclaim excessive low-carbon alcohol;

[0023] (5) Add 100g of water, raise the temperature to 40°C and stir for 30 minut...

Embodiment 2

[0025] (1) Add 1000g of waste oil with an acid value of 20mgKOH / g into the reactor, add 200g of water, start stirring, heat up to 50°C, stir for 10 minutes, add 10g of phosphoric acid, continue stirring for 60 minutes, stop stirring, cool and centrifuge, Take the oil phase for use;

[0026] (2) Add the oil phase to the reactor, add 200g of ethanol, 256.5g of diethyl carbonate, and 5g of p-toluenesulfonic acid, raise the temperature to 60-80°C, keep reflux, and measure the acid value by sampling every 30 minutes;

[0027] (3) When the acid value is less than 2.0mgKOH / g oil, cool to 40°C and add 1.2g of potassium methylate, stir for 10 minutes, add 200g of ethanol, 15g of tetrabutylammonium chloride, stir and heat up to 60-80°C, keep Reflux for 10 minutes;

[0028] (4) Change vacuum distillation device, 60~80 ℃ vacuum distillation, reclaim excessive low-carbon alcohol;

[0029] (5) Add 200g of water, raise the temperature to 60°C and stir for 10 minutes, centrifuge, wash with ...

Embodiment 3

[0031] The catering waste oil in the embodiment 1 step (1) is replaced with the swill oil of 1000g acid value 50mgKOH / g, the sodium methylate in the step (3) is replaced with sodium ethylate, and all the other steps are the same. Yield 93.4%.

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Abstract

The invention belongs to the technical field of biodiesel preparation and particularly relates to a biodiesel preparing method. Waste grease is used for preparing biodiesel through an acid-base two-step synthesizing method. The biodiesel preparing method comprises the following steps that firstly, the waste grease is subjected to acid washing with water, activated carbon adsorption and centrifugal separation treatment; secondly, methyl alcohol or ethyl alcohol, carbonic ester and an acid catalyst are added and heated for reflux esterification; thirdly, an esterified product is added with alkali to regulate pH, and methyl alcohol or ethyl alcohol and an alkali catalyst are added and heated for reflux esterification exchange; fourthly, after a reaction is finished, methyl alcohol or ethyl alcohol is steamed out through reduced pressure, washing, centrifugal layering and film evaporation drying are carried out, and biodiesel is obtained. The biodiesel preparing method has the advantages of being high in yield and reaction speed, low in energy consumption and production cost and the like, and is suitable for commercialized production.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, and in particular relates to a preparation method of biodiesel. Background technique [0002] With the increasing shortage of oil resources, clean and environmentally friendly new energy has become a hot spot for global energy development and utilization. As a new energy source that is environmentally friendly, renewable and replaceable for petrochemical diesel, biodiesel has gradually attracted global attention. At present, biodiesel research is mostly carried out using a single animal and vegetable oils, many of which are edible oils, which will have an impact on the global food supply. A large amount of waste animal and vegetable oils are produced every year in the world, which can be used to prepare biodiesel, which can not only realize the resource utilization of waste oils, but also reduce the pressure on the environment, so it is of great significance. The acid-base two-ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/02C11C3/04C11C3/10
CPCC10L1/02C11C3/04C11C3/10Y02E50/10
Inventor 车春玲
Owner SHANDONG TAIDE NEW ENERGY
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