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Method for purifying fatty acid alkyl esters highly charged with saponification products

A fatty acid alkyl ester and saponification technology, which is applied in fatty acid esterification, fatty acid chemical modification, fatty acid production, etc., can solve problems such as not very strong absorption capacity

Active Publication Date: 2012-07-04
LURGI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage must be seen that the non-aqueous, alkaline glycerol is not very absorbent of polar impurities such as excess alcohol or soap
In addition, the use of adsorbents involves considerable costs and generates residues to be disposed of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] For the purification of fatty acid methyl esters obtained from jatropha oil by means of a two-stage transesterification process, an extraction column with an internal diameter of 5 cm and a total height of 1.5 m was used. The tower comprises Montz M / MN, B-1 type structured packing with 250 m 2 / m 3 specific surface area, made of polypropylene. The height of the structured packing is 1.0m. The inlet for the extractant glycerol phase filling the column is located at the top of the column. In addition to glycerin, the glycerol phase also included 15% by weight of water mixed with citric acid. Adjust the pH to 6 by adding citric acid. The continuous inflow of the glycerol phase into the column was 125 g / hour.

[0022] The outlet for the extract, loaded glycerol phase is at the bottom of the column, at the lowest point. At the bottom of the column, below the structured packing, the fatty acid methyl ester phase to be purified is supplied and broken into small droplets ...

Embodiment 2

[0024] Instead of the extraction tower used in Example 1, a three-stage mixer-settler was used in this example. In each stage, mixing is carried out by means of intensive mixers of the type ULTRA TURRAX UTL integrated into the pipeline. The residence time in the three settling tanks was one hour each. The material streams entering the mixer-settler were all of the same composition and size as in Example 1. The stream of fatty acid methyl esters to be purified and the glycerol phase stream from the settling tank of the second mixer-settler stage are fed into the mixer of the first mixer-settler stage. The temperature of the fatty acid methyl ester stream was 65°C. The glycerol phase used as extractant and the ester phase from the settling tank of the second mixer-settler stage are fed into the mixer of the third mixer-settler stage. With the help of a heat exchanger installed between the mixer and the settling tank of the third mixer-settler stage, the temperature of the mix...

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Abstract

The invention relates to a method for the continuous extraction of impurities, in particular saponification products, present in a fatty acid alkyl ester phase obtained by the transesterification of vegetable and animal oils or fats, having a high tendency to form saponification products by means of an aqueous, acidic glycerin phase containing a complexing agent.

Description

technical field [0001] The present invention relates to a method for the continuous extraction of impurities, especially saponified products, from a phase of fatty acid alkyl esters by mixing with a glycerol phase. Background technique [0002] In the transesterification of oils or fats of vegetable or animal origin according to the process for the production of biodiesel, as described for example in DE 10 2006 044 467 A1, initially crude alkyl esters are obtained which depend on the used The type of oil or fat will have more or less impurities. Only by separating these impurities from the crude alkyl esters can a usable biodiesel be obtained. These impurities consist of viscous residues originating from the oil or fat as well as saponification products resulting from the combination of free fatty acids (FFA) contained in the oil or fat used and the fatty acid used for the transesterification reaction. The reaction of the basic catalyst, the basic catalyst is generally NaO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C1/08C10L1/02C11C3/00
CPCC10G2300/1014Y02E50/13C10L1/026C10G2300/1011C10G2300/201C11C1/08C10G2300/1018C11C3/003Y02P30/20Y02E50/10
Inventor 鲁道夫·邦施埃克哈德·西德尔赫尔穆特·萨夫特
Owner LURGI