Method for preparing biodiesel through high-temperature esterification reaction of high acid value oil

A high-acid value grease and esterification technology, which is applied in fatty acid esterification, biofuel, petroleum industry, etc., can solve the problem of immature biodiesel preparation technology, inability to realize industrial mass production, and low conversion rate of methanol esterification and other problems, to achieve the effect of improving primary esterification capacity, shortening the production cycle, and simplifying the process

Active Publication Date: 2014-04-09
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, biodiesel preparation technology is not mature, and there are many defects. Some processes are harsh or equipment requirements are too high, and industrial mass production cannot be realized. For example, Chinese patent CN1654601 discloses "a method for preparing biodiesel", which is in ultrasonic esterification It is carried out in the reactor, and the water content of the raw material oil is required to be below 0.07%.
Some esterification reactions to prepare biodiesel have a low esterification rate and are carried out in multi-step esterification reactions. The cycle is too long, the process is complicated, and the production cost is high. For example, Chinese patent CN101624534A discloses "A Method for Esterification of Methanol in Biodiesel Production" , the entire methanol esterification p

Method used

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  • Method for preparing biodiesel through high-temperature esterification reaction of high acid value oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Esterification reaction: add palmitic acid (acid value 178.8 mgKOH / g) and catalyst concentrated sulfuric acid to the esterification reactor in sequence, the amount of concentrated sulfuric acid is 0.10% of the mass of palmitic acid, turn on the stirring and heating device, and raise the temperature to 125°C After the temperature is constant, methanol is slowly added dropwise to the esterification reactor through a peristaltic pump to carry out the esterification reaction. At the same time, the condensing device cools the unreacted methanol and the moisture generated by the reaction. The amount of methanol is 90.0% of the mass of palmitic acid. The dropping rate of methanol was adjusted so that the whole dropping process was completed within 2.0 h; the reaction was continued for 10 min after the dropping was completed, and the esterification rate was 99.15%. Finally, unreacted methanol and generated water were distilled off to obtain crude biodiesel.

[0032] (2) Dist...

Embodiment 2

[0035] (1) Esterification reaction: add oleic acid (acid value 195.0 mgKOH / g) and catalyst p-toluenesulfonic acid to the esterification reactor in sequence, the amount of p-toluenesulfonic acid is 0.15% of the mass of oleic acid, turn on the stirring and heating device , raise the temperature to 130°C, and after the temperature is constant, slowly add methanol dropwise to the esterification reactor through the dropping device to carry out the esterification reaction. At the same time, the condensing device cools the unreacted methanol and the water generated by the reaction. 75.0% of the mass, and the methanol drop rate was controlled so that the entire dropwise addition process was completed within 4.0 h; after the dropwise addition was completed, the reaction was continued for 15 min, and the esterification rate was 98.96%. Finally, unreacted methanol and generated water were removed by distillation to obtain Crude biodiesel.

[0036] (2) Distillation treatment: Distill the ...

Embodiment 3

[0039] (1) Esterification reaction: add acidified oil (acid value 80.0 mgKOH / g) and catalyst concentrated sulfuric acid to the esterification reactor in sequence. After the temperature is constant, methanol is slowly added dropwise to the esterification reactor through the dropping device to carry out the esterification reaction. At the same time, the condensing device cools the unreacted methanol and the moisture generated by the reaction. The amount of methanol used is 60.0% of the acidified oil quality. The dropping rate of methanol was controlled so that the whole dropping process was completed within 2.5 h; the reaction was continued for 10 min after the dropping was completed, and the esterification rate was 98.54%. Finally, unreacted methanol and generated water were distilled off to obtain crude biodiesel.

[0040] (2) Distillation treatment: Distill the crude biodiesel produced in step (1) under reduced pressure with a vacuum of -0.1 MPa, and collect fractions at a tem...

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Abstract

The invention discloses a method for preparing biodiesel through high-temperature esterification reaction of high acid value oil, belonging to the technical field of biodiesel preparation. The method comprises the following steps: (1) esterification reaction, adding the high acid value oil and a catalyst into an esterification reactor, dripping methanol into the esterification reactor by using a dripping device for esterification reaction, meanwhile, cooling unreacted methanol and moisture generated in reaction by using a condensing device, and after the reaction is finished, removing the methanol and the moisture through distillation to obtain a biodiesel crude product; and (2) distillation treatment, distilling the obtained biodiesel crude product under reduced pressure, and collecting fraction, namely a biodiesel finished product. The method disclosed by the invention realizes the one-step esterification reaction of the high acid value oil under the conditions of normal pressure and high temperature, and the esterification process and the water cooling and removal are carried out simultaneously for the preparation of the biodiesel, so that the method has the advantages of easy process, short production cycle, low energy consumption and the like, is easy to industrially produce, and can significantly increase the yield of the biodiesel per unit time and the output of a single kettle.

Description

[0001] technical field [0002] The invention belongs to the technical field of new biological energy, and in particular relates to a method for preparing biodiesel through high-temperature esterification of oil with high acid value. [0003] Background technique [0004] In recent years, due to the depletion of petroleum resources and the global ecological environment change caused by the use of fossil fuels, the development of bioenergy with the advantages of renewable and green environmental protection has been paid more and more attention by people. An important product in bioenergy is biodiesel, which is high acid value oil methyl ester, which is a clean and renewable energy source. It mainly uses long carbon chain fatty acids, acidified oil, gutter oil and other high acid value oils as raw materials It is a liquid fuel that can replace petroleum diesel and is synthesized by esterification with other low-carbon alcohols such as methanol or ethanol. It has the advantage...

Claims

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Application Information

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IPC IPC(8): C11C3/04C10L1/02
CPCY02E50/13Y02E50/10
Inventor 蒋剑春刘朋冯国东应浩许彬陈水根
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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