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Process for preparing bio-diesel through fatty acid two-step esterifying method

A biodiesel and fatty acid technology, applied in fatty acid esterification, carboxylic acid ester preparation, organic compound preparation, etc., can solve the problems of high biodiesel, affecting the preparation of biodiesel, production of glycerol and saponification, etc., and achieve the speed of acid reduction Fast, short time, good acid-lowering effect

Inactive Publication Date: 2011-09-21
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the industrial production of biodiesel mainly adopts the transesterification method, but the transesterification method requires that the acid value must be less than 1mgKOH / g. For oils with high free fatty acid content, such as acidified oil, catering waste oil, and jatropha oil and rubber seeds with certain rancidity Oil, etc., have a high acid value and cannot be directly transesterified to prepare biodiesel. Generally, it is necessary to lower the acid value through esterification before performing transesterification. The transesterification will produce glycerin and saponification, which will affect the preparation of biodiesel.

Method used

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  • Process for preparing bio-diesel through fatty acid two-step esterifying method
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  • Process for preparing bio-diesel through fatty acid two-step esterifying method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Step (1): Use a three-necked flask as an esterification reactor, add palmitic acid (analytical pure) with an initial acid value of 220 mgKOH / g, methanol, and sulfuric acid. The amount of methanol used is 80% of the weight of the fatty acid; the concentration of sulfuric acid is 98% and the amount used is 0.5% of the weight of the fatty acid. Stir continuously and heat to a temperature of 65±5°C. The raw materials are refluxed in the reaction device until the reaction reaches equilibrium or tends to Equilibrium, enter step (2) when the acid value is 29.5mgKOH / g.

[0023] Step (2): Continuously feed methanol liquid into the three-necked flask at a temperature of 100±5°C. The flow rate of methanol is 1.0mL / min. The condensation device recovers the water generated by esterification and excess methanol, and measures the acid value. When the acid value Stop the reaction when it is lower than 1.0mgKOH / g.

Embodiment 2

[0025] Taking the initial acid value of 275 mgKOH / g lauric acid (analytical pure) as the fatty acid, other parameters are shown in Table 1, and the steps are the same as in Example 1.

Embodiment 3

[0027] The waste oil was hydrolyzed with an initial acid value of 170 mgKOH / g (the waste oil was hydrolyzed by conventional methods to form fatty acids) into fatty acids, and the remaining parameters were shown in Table 1, and the steps were the same as in Example 1.

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Abstract

The invention discloses a process for preparing bio-diesel through a fatty acid two-step esterifying method, belonging to a method for preparing the bio-diesel through esterification reaction. According to the method, in the first-step esterification reaction, the esterification reaction is performed on fatty acid, methanol and a catalyst according to a proportion; and when the reaction is balanced, the second-step esterification reaction is performed, liquid methanol is introduced at a certain temperature, and water and redundant methanol steam are discharged to ensure that the reaction is performed forward to further reduce the acid value of acidic fatty acid methyl ester. The process has easy and feasible flow, short time, high deacidification speed and low energy consumption, and the reaction products only comprise fatty acid methyl ester and water, so the process is favorable for purifying the bio-diesel.

Description

technical field [0001] The invention belongs to a method for preparing biodiesel by esterification reaction. Background technique [0002] Biodiesel is a long-chain fatty acid monoester obtained by the esterification reaction of animal and vegetable oils and alcohols. Typical biodiesel is long-chain fatty acid methyl ester (R-COOCH 3 ). Esterification is a process in which fatty acids and monohydric alcohols react with acidic catalysts and higher temperatures to form esters. It is reciprocal to hydrolysis. The reaction mechanism is as follows: [0003] [0004] At present, the industrial production of biodiesel mainly adopts the transesterification method, but the transesterification method requires that the acid value must be less than 1mgKOH / g. For oils with high free fatty acid content, such as acidified oil, catering waste oil, and jatropha oil and rubber seeds with certain rancidity Oil, etc., have a high acid value and cannot be directly transesterified to prepare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C10L1/02C07C69/003C07C67/08
CPCY02E50/13Y02E50/10
Inventor 张无敌周晓庆陈玉保尹芳李建昌徐锐刘士清马煜
Owner YUNNAN NORMAL UNIV
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