Method for removing base catalyst from crude biodiesel

A technology of alkali catalyst and biodiesel, applied in biofuel, fat production, petroleum industry, etc., can solve the problems of increasing the cost of refining process, difficult to popularize and apply, and high cost of adsorbent production, so as to avoid the problem of waste water, avoid alcoholysis, Yield-enhancing effect

Active Publication Date: 2012-07-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, water washing is commonly used in industry to remove the alkali catalyst in crude biodiesel (unrefined treatment) (Atadashi I M, et al.Applied Energy, 2011, 88: 4239-4251), and about 10 L of waste water is produced after 1 L of biodiesel is washed (Saleh J , et al.Fuel, 2010, 89: 2260-2266), according to this calculation, the annual production of 10,000 tons of biodiesel needs to treat more than 100,000 tons of wastewater; in addition, the washing method also increases the cost of the refining process, and the refining cost accounts for about 60%-80% of the total cost of biodiesel production (Atadashi I M, et al. Applied Energy, 2011, 88: 4239-4251)
In addition, Lu Bilin proposed to use acid magnesium silicate as an adsorbent instead of washing and purifying crude biodiesel, and achieved good experimental results, but the production cost of this adsorbent is high, and it is difficult to popularize and apply in industrial production (Lu Bilin. China Oil , 2009, 34(5): 46-48)

Method used

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  • Method for removing base catalyst from crude biodiesel
  • Method for removing base catalyst from crude biodiesel
  • Method for removing base catalyst from crude biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: The removal method of the alkali catalyst in this crude biodiesel, the steps are as follows: using glycerol as the extractant to remove the alkali catalyst in the crude biodiesel, single-stage extraction of glycerol, the extraction temperature is 60-150 ° C, and the operating pressure is At normal pressure, the mass ratio of crude biodiesel to glycerin is between 10-1. The alkali catalyst dissolved in the glycerol phase is separated by cooling and crystallization, the crystallization temperature is 0°C-20°C, and the crystallization time is 1h-12h, and the separated glycerin and alkali catalyst are recycled.

[0014] In order to illustrate the solubility of the alkali catalyst in glycerin, the solubility of the alkali catalyst KOH in glycerol is used to illustrate.

[0015] Solubility of KOH in glycerol at different temperatures in table 1

[0016]

[0017] It can be seen from Table 1 that the alkali catalyst KOH is easily soluble in glycerol, and glyce...

Embodiment 2

[0023] Embodiment 2: Utilize refined biodiesel by-product glycerin to extract crude biodiesel medium alkali catalyst, alkali catalyst is an example with KOH, figure 1 It is a schematic diagram of the process of extracting crude biodiesel KOH from refined glycerin.

[0024] To illustrate the effect of glycerol extraction, crude biodiesel (3.74mgKOH / g oil) was figure 1 The method shown is three-stage extraction, the extraction temperature is 100°C, the mass ratio of crude biodiesel to glycerin is between 10-1, fresh glycerin is used for the first-stage extraction, first-grade glycerin is used for the second-stage extraction, and second-grade glycerin is used for the third-stage. The extraction effect is shown in Table 3.

[0025] Table 3 KOH effect of refined glycerin extraction crude biodiesel

[0026]

[0027] It can be seen from Table 3 that the KOH content in the crude biodiesel can be greatly reduced by three-stage extraction of glycerol, and the KOH content in the oil...

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Abstract

The invention relates to a method for removing a base catalyst from crude biodiesel. The method comprises the following step of: removing the base catalyst from the crude biodiesel by taking glycerin as an extracting agent, wherein the extraction temperature is 60-150DEG C, the operating pressure is normal pressure, and a mass ratio of the crude biodiesel to the glycerin is 10-1. Compared with the prior art, the method has the advantages that: 1, the method for removing the base catalyst from the biodiesel by taking the biodiesel byproduct glycerin as the extracting agent avoids a problem of wastewater caused by a water washing process; 2, the base catalyst dissolved in the glycerin phase is separated in a cooling crystallization mode, the glycerin and the base catalyst can be cyclically applied to a production process mechanically, and production cost is reduced; and 3, the base catalyst is effectively removed, alcoholysis in the high temperature vacuum rectification process of the biodiesel is avoided, and the biodiesel rectification yield is improved.

Description

technical field [0001] The invention relates to a method for removing alkali catalysts, in particular to a method for removing alkali catalysts in crude biodiesel. Background technique [0002] The depletion of petrochemical energy and the environmental pollution caused by the use process have prompted people to look for renewable alternative energy. As a clean and renewable fuel, biodiesel (fatty acid methyl ester) is considered to be the best alternative fuel for petrochemical energy. It is produced from animal and vegetable oils, waste oils, etc., through transesterification with methanol. The main production methods include homogeneous Acid catalysis, homogeneous base catalysis, enzyme catalysis, supercritical method, solid acid-base catalysis, etc., among which the most commonly used method is homogeneous base catalysis. Compared with other methods, the homogeneous base-catalyzed exchange method is currently the method for the industrial production of biodiesel in vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B3/00C10L1/02
CPCY02E50/13Y02E50/10
Inventor 聂勇计建炳陆向红夏凡
Owner ZHEJIANG UNIV OF TECH
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