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High efficiency prepn process of biological diesel oil

A biodiesel and high-efficiency technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems of low conversion rate of biodiesel, reduce catalyst activity, affect esterification effect, etc., to improve catalytic efficiency and conversion Efficiency, shortening the separation time, and improving the yield

Inactive Publication Date: 2007-06-06
李燕丽 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of acidic catalysts on the conversion of FFA to esters is very obvious. However, the disadvantages of the acid-catalyzed process are that on the one hand, the acidic catalysts are very slow in converting triglycerides into biodiesel, and the conversion rate of biodiesel is very low; On the one hand, FFA reacts with alcohol to produce water, especially waste oil with high acid value will continue to generate water during the esterification process. The existence of water is equivalent to continuously diluting the catalyst and reducing the activity of the catalyst, which inhibits the esterification of FFA and glycerol. The transesterification reaction, which directly affects the esterification effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add 100 g of hogwash oil into the reaction vessel and heat it at 85°C.

[0023] (2) add the concentrated sulfuric acid of 0.6g 98% in the reaction vessel, and constantly pass into excessive pure methanol (99.8%) steam in the reaction liquid, the steam coming out from the reaction vessel will be condensed, the moisture in the steam and impurities are separated, and the condensed methanol vapor continues to pass into the reaction solution. The reaction process requires heating and constant stirring. The heating temperature is 100 ° C, and the reaction time is 1.5 hours.

[0024] (3) Add 0.6g of NaOH to the reaction vessel, heat it to 110°C and keep stirring, part of the NaOH is used to neutralize the concentrated sulfuric acid in the reaction solution, and the remaining NaOH is used as a catalyst to carry out the transesterification reaction. The reaction time is 45 minutes.

[0025] (4) Detect the pH value of the reaction product in the reaction vessel. When the pH ...

Embodiment 2

[0030] (1) Add 100 g of soybean oil into the reaction vessel and heat it at 70°C.

[0031] (2) add the vitriol oil of 0.45g 98% in reaction vessel, and constantly pass into excessive pure methyl alcohol (99.5% of analytical pure methanol) steam in reaction liquid, the steam that comes out from reaction vessel will be condensed, steam The moisture in the mixture and the impurities brought out are separated, and the condensed methanol vapor continues to pass into the reaction solution. The reaction process requires heating and constant stirring. The heating temperature is 70 ° C, and the reaction time is 1 hour.

[0032] (3) Add 0.4g of NaOH to the reaction vessel, heat it to 90°C and keep stirring, part of the NaOH is used to neutralize the concentrated sulfuric acid in the reaction solution, and the remaining NaOH is used as a catalyst to carry out the transesterification reaction. The reaction time is 0.5 hours.

[0033] (4) Detect the pH value of the reaction product in the...

Embodiment 3

[0038] (1) Add 100 g of animal fat into the reaction vessel and heat it at 100°C.

[0039] (2) add the vitriol oil of 0.7g 98% in reaction vessel, and constantly pass into excessive pure ethanol (analytical pure ethanol 99.7%) steam in reaction liquid, the steam that comes out from reaction vessel will be condensed, steam The moisture in the mixture and the impurities brought out are separated, and the condensed ethanol vapor continues to pass into the reaction liquid. The reaction process requires heating and constant stirring. The heating temperature is 130 ° C, and the reaction time is 2 hours.

[0040] (3) Add 0.8g of KOH to the reaction vessel, heat to 90°C and keep stirring, part of the KOH is used to neutralize the concentrated sulfuric acid in the reaction solution, and the remaining KOH is used as a catalyst for transesterification reaction. The reaction time is 1 hour.

[0041](4) Detect the pH value of the reaction product in the reaction vessel. When the pH value ...

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PUM

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Abstract

The present invention discloses process of preparing biodiesel oil in high efficiency. The preparation process includes the following steps: A. heating grease in a reactor; B. adding acid catalyst via heating and stirring, introducing excessive pure low carbon alcohol vapor into the reaction liquid continuously, condensing the volatilized gas and returning the condensate to the reactor for reuse; C. adding excessive alkaline catalyst, heating and stirring; and D. separating the reaction product to obtain coarse glycerin and biodiesel oil. The process has ultimate biodiesel oil conversion rate up to 98 %, high catalytic efficiency, few impurity, low alcohol consumption and short preparation period of about 4 hr.

Description

technical field [0001] The invention relates to a method for preparing diesel oil, in particular to a method for efficiently preparing biodiesel. Background technique [0002] Biodiesel is an alternative diesel fuel consisting of fatty acid alkyl monoesters from vegetable oils or tallow. At present, most biodiesel is mainly produced from oil, methanol and a basic catalyst or an acidic catalyst, and the conversion rate of the basic catalyst is higher than that of the acidic catalyst. Waste fats such as catering waste oil and industrial tallow can not be directly converted into biodiesel due to their high content of free fatty acids (FFA), which tend to form soaps when alkaline catalysts are used. Soap prevents separation of biodiesel from glycerol during production. The process currently being developed is to pretreat these high FFA feedstocks with acidic catalysts so that soap species cannot form. The effect of acidic catalysts on the conversion of FFA to esters is very o...

Claims

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Application Information

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IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 李燕丽
Owner 李燕丽
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