Method for separating saturated fatty acid methyl ester from biodiesel

A technology of fatty acid methyl ester and biodiesel, which is applied in chemical instruments and methods, biofuels, biomaterials, etc., can solve problems such as poor methanol solubility, and achieve the effects of optimizing dilution ratio, increasing processing capacity, and improving crystal morphology.

Active Publication Date: 2010-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although methanol can be used as a solvent for solvent fractional crystallization, when methanol is used as a solvent and the filter residue is washed at low temperature, because methanol has poor solubility at low temperature, it is necessary to wash the filter residue with a large amount of methanol to obtain high-purity saturated fatty acid formazan. ester

Method used

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  • Method for separating saturated fatty acid methyl ester from biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] With the mixture of 5% (weight) acetone, 20% (weight) methyl ethyl ketone and 75% (weight) ethanol as solvent, add solvent to biodiesel in four times, one time and four times solvent use fresh solvent, two times and Use the filtrate from one filter cake washing for three solvents; the first dilution ratio is 0.2:1, the first dilution temperature is 45°C; the cooling rate is 1-2°C / min, the filtration temperature is -8°C, and the dilution solvent for the first filter cake washing is The filtrate of the secondary filter cake washing, the remaining test conditions and test results are shown in Table 2. The schematic flow chart is shown in Figure 1.

Embodiment 2

[0032] With the mixture of 15% (weight) acetone and 85% (weight) ethanol as solvent, the test process is basically the same as Example 1, except that the dilution ratio and operating temperature are different. The test conditions and test results are shown in Table 3.

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Abstract

The invention relates to a method for separating saturated fatty acid methyl ester from biodiesel, comprising the following steps of: adding a solvent which contains 60-99wt% of ethanol and the balance of acetone and/or butanone into biodiesel, reducing the temperature under the condition of stirring, filtering to obtain a filter cake and filtrate and recovering the solvent from the filtrate to obtain low pour point biodiesel; and washing the filter cake by using the solvent and recovering the solvent from the filter cake to obtain high-purity saturated fatty acid methyl ester. Separating the biodiesel by using the method can simultaneously obtain low pour point biodiesel and high-purity saturated fatty acid methyl; and the method is especially suitable for the separation of the biodiesel having higher saturated fatty acid methyl ester content.

Description

technical field [0001] The invention relates to a method for separating saturated fatty acid methyl ester from biodiesel. Background technique [0002] Biodiesel is a clean and renewable energy. With the continuous consumption of petroleum resources and the increasing awareness of environmental protection, biodiesel has attracted more and more attention. [0003] Biodiesel is basically composed of various fatty acid methyl esters, and saturated fatty acid methyl ester is an important part of it. For example, in biodiesel produced from cottonseed oil, the content of saturated fatty acid methyl ester is about 20wt%, and biodiesel produced from palm oil In diesel oil, the content of saturated fatty acid methyl ester is greater than 40wt%. Saturated fatty acid methyl ester is an important basic chemical raw material, which can be used to prepare green and environment-friendly surfactant MES (fatty acid methyl ester sulfonate). The freezing point of saturated fatty acid methyl ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/58C07C69/003C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 杨文中丁洛
Owner CHINA PETROLEUM & CHEM CORP
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