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Method of preparing biologic diesel oil from high acid value vegetable oil catalyzed by p-toluenesulfonic acid

A technology of p-toluenesulfonic acid and biodiesel, which is applied in the preparation of liquid hydrocarbon mixtures, biological raw materials, biofuels, etc., can solve the problems of difficult separation, many side reactions, high energy consumption, etc. Outstanding catalytic performance and high equipment requirements

Active Publication Date: 2008-07-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If frying oil is used as a raw material, due to its high content of free fatty acids, it is easy to cause saponification reaction, resulting in emulsification of the reaction system, difficulty in separation, and reduction of reaction yield.
[0012] On the contrary, the use of concentrated sulfuric acid as a catalyst has lower requirements on raw materials and will not cause saponification reaction, but its disadvantages are that the reaction requires higher temperature and longer time, and there are many side reactions caused by oxidation, and the product has deep color and strong Corrosion reaction equipment and residual liquid pollute the environment; and the acid-catalyzed transesterification reaction is reversible, with high energy consumption and low yield

Method used

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  • Method of preparing biologic diesel oil from high acid value vegetable oil catalyzed by p-toluenesulfonic acid
  • Method of preparing biologic diesel oil from high acid value vegetable oil catalyzed by p-toluenesulfonic acid
  • Method of preparing biologic diesel oil from high acid value vegetable oil catalyzed by p-toluenesulfonic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The influence of embodiment 1 temperature on reaction

[0023] Weigh about 40 g of high acid value vegetable oil samples, and react under the conditions of 5% p-toluenesulfonic acid catalyst, alcohol-oil mass ratio of 1:2, and reaction time of 3 h. Investigate the influence of temperature on the reaction, as shown in Table 2:

[0024] The influence of table 2 temperature on reaction

[0025]

[0026] No reaction at 50°C, slow reaction at 60°C, rapid reaction above 75°C. This is because as the temperature increases, the activity of the reactants increases and the reaction speed increases, which leads to an increase in the esterification rate. However, due to the excess amount of methanol in the reaction system, there is an optimal reaction temperature for the transesterification reaction, and the temperature is low. It will slow down the reaction and reduce the rate of esterification. If the temperature is too high, the volatilization of methanol will be accelerated...

Embodiment 2

[0027] The impact of embodiment 2 catalyst dosage on reaction

[0028] The mass ratio of alcohol to oil was 1:2 and the temperature was 80°C for 3 hours to investigate the effect of different amounts of catalyst p-toluenesulfonic acid (0.5%, 2%, 3%, 5%) on the reaction yield. As in Table 3:

[0029] The influence of table 3 catalyst dosage on reaction

[0030]

[0031] It can be seen from the table above that the influence of the amount of catalyst on the reaction yield and viscosity is not obvious, and the amount of catalyst can be 0.5%-3% of the raw oil.

Embodiment 3

[0032] The influence of embodiment 3 alcohol oil ratio on reaction

[0033] The catalyst addition was 3%, and the reaction was carried out at 75°C for 3 hours to investigate the influence of different alcohol-oil mass ratios (1:0.5, 1:1, 1:2, 1:3) on the reaction yield. As shown in Table 4:

[0034] The impact of table 4 alcohol-oil ratio on reaction

[0035]

[0036] It can be seen from the above table that with the change of methanol concentration, the esterification rate also increases correspondingly. Among them, when the mass ratio of methanol to oil is 1:1, the increase rate of esterification rate is the largest. Considering economic factors comprehensively, adopt Excess methanol not only has little effect on improving the esterification rate, but also leads to an increase in cost. Therefore, in the actual application process, the mass ratio of methanol to acidified oil should be 1:1 to 1:3 as the best.

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Abstract

the invention discloses a preparing method of biological diesel based on p-toluenesulfonic acid as catalyst, which is characterized by the following: adopting high-acid value plant oil at 5-200mgKOH / g as raw material; setting the final reacting temperature at 60-75 deg.c and catalyst quantity at 0.5-3% corresponding to high-acid value plant oil; making the quality rate of alcohol and oil at 1:1-1:3; reacting for 2-4 h; proceeding film evaporation disposal when the acid value is 5-100mgKOH / g; proceeding supplementing disposal of ester exchange for triglyceride.

Description

technical field [0001] The invention discloses a method for preparing biodiesel from high acid value vegetable oil by catalyzing p-toluenesulfonic acid, belonging to the technical field of biodiesel. Background technique [0002] Biodiesel is a renewable diesel alternative fuel obtained by converting vegetable oil and recycled animal and vegetable oil. ASTM (American Society for Testing and Materials) D6751 defines biodiesel as "long carbon chain fatty acid ester, one molecule of alcohol and one molecule of long carbon chain fatty acid are connected to the two ends of the ester bond respectively. Crude oil or refined vegetable oil contains three ester bonds, which cannot It's called biodiesel, and biodiesel can be methyl ester, ethyl ester, isopropyl ester, or whatever." [0003] All kinds of animal and vegetable oils are not suitable to be directly used as alternative fuels, because the molecular weight of oil is about 4 times that of petroleum diesel, and the viscosity is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 王兴国刘元法金青哲
Owner JIANGNAN UNIV