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Process for preparing biodiesel

A biodiesel and process technology, used in biofuels, petroleum industry, liquid carbonaceous fuels, etc., can solve the problems of poor hydrolysis and oxidation stability of biodiesel, unusable biodiesel, low temperature crystallization, etc., and achieve excellent oxidation and hydrolysis stability. The effect of the reaction process is simple and easy to implement, and the acid reduction speed is fast.

Inactive Publication Date: 2015-08-26
刘敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different raw materials also have a certain impact on the performance of the final biodiesel product. If the selected raw material has a high content of saturated fatty acids (such as cattle, sheep and other animal fats), the biodiesel produced must have a high freezing point, resulting in low-temperature crystallization and Gelling, so that this type of biodiesel cannot be used in the northern and severe cold regions
If the selected raw materials have high content of unsaturated fatty acids (such as soybean oil, sunflower oil and other vegetable oils), although the biodiesel produced has a lower freezing point, the lowest can reach -10°C, but because it contains a large number of unsaturated bonds, making This type of biodiesel has poor hydrolysis and oxidation stability, and there is a problem of corrosion to equipment

Method used

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  • Process for preparing biodiesel

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Effect test

Embodiment 1

[0017] A process for preparing biodiesel, using fatty acid methyl ester biodiesel as raw material and methane on an acid-loaded catalyst to obtain isomerized fatty acid methyl ester biodiesel through an alkylation process, is characterized in that it comprises the following steps:

[0018] (1) Pass fatty acid methyl ester, methane and acid-loaded catalyst into the reactor, the mass ratio of fatty acid methyl ester to methane is 1:4, the amount of acid-loaded catalyst is 2wt% of fatty acid methyl ester, the pressure control range is 6MPa, the temperature 90°C, reaction time 2h;

[0019] (2) At a temperature of 90°C, continuously feed methanol liquid into the reactor with a methanol flow rate of 0.8mL / min. The condensing device recovers the water generated by esterification and excess methanol, and measures the acid value. When the acid value is lower than 1.0 The reaction stops when mgKOH / g.

[0020] The methanol liquid in step (2) is continuously passed to the bottom of the o...

Embodiment 2

[0023] A process for preparing biodiesel, using fatty acid methyl ester biodiesel as raw material and methane on an acid-loaded catalyst to obtain isomerized fatty acid methyl ester biodiesel through an alkylation process, is characterized in that it comprises the following steps:

[0024] (1) Pass fatty acid methyl ester, methane and acid-loaded catalyst into the reactor, the mass ratio of fatty acid methyl ester to methane is 1:4, the amount of acid-loaded catalyst is 5wt% of fatty acid methyl ester, the pressure control range is 8MPa, the temperature 120°C, reaction time 3h;

[0025] (2) At a temperature of 110°C, continuously feed methanol liquid into the reactor, the flow rate of methanol is 1.2mL / min, the condensing device recovers the water generated by esterification and excess methanol, and measures the acid value. When the acid value is lower than 1.0 The reaction stops when mgKOH / g.

[0026] The methanol liquid in step (2) is continuously passed to the bottom of th...

Embodiment 3

[0029] A process for preparing biodiesel, using fatty acid methyl ester biodiesel as raw material and methane on an acid-loaded catalyst to obtain isomerized fatty acid methyl ester biodiesel through an alkylation process, is characterized in that it comprises the following steps:

[0030] (1) Pass fatty acid methyl ester, methane and acid-loaded catalyst into the reactor, the mass ratio of fatty acid methyl ester to methane is 1:4, the amount of acid-loaded catalyst is 4wt% of fatty acid methyl ester, the pressure control range is 7MPa, the temperature The temperature is 105°C, and the reaction time is 2.5h;

[0031] (2) At a temperature of 100°C, continuously feed methanol liquid into the reactor, the flow rate of methanol is 1mL / min, the condensing device recovers the water and excess methanol generated by esterification, and measures the acid value. When the acid value is lower than 1.0mgKOH / g to stop the reaction.

[0032] The methanol liquid in step (2) is continuously...

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Abstract

The invention relates to a process for preparing biodiesel. According to the invention, fatty acid methyl ester biodiesel is adopted as a raw material, and is processed through an alkylation process with gas alkane on an acid-loading catalyst, such that isomeric fatty acid methyl ester biodiesel is obtained. The product provided by the invention has low solidifying point, excellent oxidation stability and excellent hydrolysis stability. The solidifying point is reduced by 10-30 DEG C than that before the reaction. The oxidation stability is improved by more than 1 time. With the product provided by the invention, defects of existing biodiesel are made up. The performance of the product exceeds those of commercial products and other alternative energy sources provided by current researches. The product can become a safe and renewable high-end synthetic diesel product.

Description

technical field [0001] The invention relates to the field of biodiesel, in particular to a process for preparing biodiesel. Background technique [0002] With the increasingly serious global energy shortage and environmental deterioration, controlling vehicle exhaust emissions and protecting the natural environment on which human beings live have become urgent problems for human beings to solve. From the perspective of environmental protection and resource strategy, energy researchers all over the world are actively exploring the development of alternative fuels and renewable energy sources, biodiesel is one of them, and it is based on aquatic plants such as oil crops, wild oil plants and engineered microalgae. Grease, animal fat, food waste oil, etc. are made of raw material oil. It is a renewable energy source with good lubricity, safety, and combustion performance. It is biodegradable. After use, the emission of sulfide is greatly reduced, and it has good safety. and eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/14C11C3/04C10L1/02
CPCC10L1/02C11C3/04C11C3/14Y02E50/10
Inventor 刘敏
Owner 刘敏
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