Method and device for continuously preparing biodiesel by connecting multiple towers in series

A biodiesel and product technology, applied in separation methods, biofuels, chemical instruments and methods, etc., can solve problems such as few research reports, and achieve the effects of shortened reaction time, simple assembly, and flexible structure

Pending Publication Date: 2021-10-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there have been many studies on the preparation of biodiesel by transesterification, but in the continuous preparation of biodiesel, there are few reports on the separation of the product glycerol to improve the conversion rate and the recycling of catalysts and methanol in glycerol.

Method used

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  • Method and device for continuously preparing biodiesel by connecting multiple towers in series
  • Method and device for continuously preparing biodiesel by connecting multiple towers in series
  • Method and device for continuously preparing biodiesel by connecting multiple towers in series

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of soybean oil methyl ester comprises the following steps:

[0044] Both stirred reaction towers are heated in a super constant temperature water bath at 60°C. Take soybean oil and preheat it to 60°C with a water bath. Mix methanol and KOH at a mass ratio of 300:14, and preheat the resulting methanol-KOH solution to 60°C with a water bath.

[0045] 1) In the first-stage stirring reaction tower, soybean oil and methanol-KOH solution are fed at the same time, the feeding rate of soybean oil is 56.6ml / min, and the feeding rate of methanol-KOH solution is 8.4ml / min. While feeding, turn on the external motor to drive the stirring shaft and the stirring blades to rotate at a speed of 500r / min. Stir and mix the reaction for about 10 minutes, the top of the tower starts to discharge, and the feed liquid enters the static separation tank to stand and stratify. The yield of soybean oil methyl ester is about 83%.

[0046] 2) After reacting for 30 minutes accord...

Embodiment 2

[0051] The preparation of methyl linoleate comprises the following steps:

[0052] Both stirred reaction towers are heated in a super constant temperature water bath at 60°C. Take linoleic acid triglyceride and preheat it to 60°C with a water bath. Mix methanol and KOH at a mass ratio of 20:1, and preheat the resulting methanol-KOH solution to 60°C with a water bath.

[0053] 1) In the first-stage stirring reaction tower, triglyceride linoleate and methanol-KOH solution are fed at the same time, the feed rate of triglyceride linoleate is 59.1ml / min, and the feed rate of methanol-KOH solution is 7.3ml / min . While feeding, turn on the external motor to drive the stirring shaft and the stirring blades to rotate at a speed of 500r / min. Stir and mix for about 9.8 minutes, the top of the tower starts to discharge the material, and the material liquid enters the static separation tank to stand and stratify. The crude glycerol in the static separation tank is not refluxed into the...

Embodiment 3

[0059] The preparation of methyl palmitate comprises the following steps:

[0060] Both stirred reaction towers are heated in a super constant temperature water bath at 60°C. Take industrial palm oil and preheat it to 60°C with a water bath. Mix methanol and KOH at a mass ratio of 350:14, and preheat the resulting methanol-KOH solution to 60°C with a water bath.

[0061] 1) In the first-stage stirring reaction tower, industrial palm oil and methanol-KOH solution are fed at the same time, the feed rate of industrial palm oil is 55.6ml / min, and the feed rate of methanol-KOH solution is 10.8ml / min. While feeding, turn on the external motor to drive the stirring shaft and the stirring blades to rotate at a speed of 500r / min. Stir, mix and react for about 10 minutes, the top of the tower starts to discharge, and the feed liquid enters the static separation tank to stand and stratify. The crude glycerol in the static separation tank is not refluxed into the first-stage stirring rea...

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Abstract

The invention discloses a method and a device for continuously preparing biodiesel by connecting multiple towers in series, wherein the method comprises the steps: feeding an alkali alcohol solution and raw oil from the bottom of a first-stage stirring reaction tower, stirring, mixing and reacting, discharging crude biodiesel and byproduct crude glycerol from the top of the tower, feeding into a static separation tank, quickly layering, collecting lower-layer crude glycerine, refluxing part of the crude glycerine into the bottom of the first-stage stirring reaction tower, and recycling the catalyst and methanol dissolved in the crude glycerine; and feeding the upper-layer crude biodiesel in the static separation tank into the bottom of a second-stage stirring reaction tower, fully stirring and mixing with the alkali alcohol solution again, reacting, and discharging from the tower top. The process is simple, the multi-stage stirring reaction towers are combined to strengthen the reaction process, the reaction time is shortened, the catalyst and methanol are fed twice, the utilization rate of raw materials is improved, oil saponification caused by excessive catalyst is avoided, glycerol is separated to improve the conversion rate, methanol and the catalyst are recycled, the production cost is saved, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of biodiesel preparation, and in particular relates to a method and a device for continuously preparing biodiesel in series with multiple towers. Background technique [0002] At present, there are mainly two methods for preparing biodiesel in industry: acid catalysis and base catalysis. Already industrialized basic catalysts mainly use methanol-soluble KOH, NaOH, etc. to catalyze liquid-phase reactions, and solid base-catalyzed heterogeneous reactions. Sodium hydroxide (or potassium) is used as the catalyst, the acid value of the oil raw material should not exceed 2 mg KOH / g, and the dosage of the catalyst is 0.5-2.0% of the weight of the oil. Compared with base catalysis, acidic catalysts can process raw materials with high acid value, but the reaction speed of acid catalyzed transesterification is very slow, and requires relatively high reaction temperature and alcohol-oil ratio, so in domestic and forei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18B01J19/00B01D17/02B01D1/00B01D1/30C11C3/10C10L1/02
CPCB01J19/1862B01J19/0006B01J19/0053B01D17/0208B01D1/00B01D1/30C11C3/10Y02E50/10
Inventor 刘学军李钦计建炳马葛菲吕振霄杜昊展竺少铭
Owner ZHEJIANG UNIV OF TECH
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