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Method for preparing biodiesel by lowering value of high acid palm oil

A biodiesel and palm oil technology, applied in the direction of biological raw materials, biofuels, petroleum industry, etc., can solve the problems of severe reactor corrosion, expensive resin, and difficult to obtain products, and achieve no equipment corrosion, easy separation, and reduced acid value effect

Inactive Publication Date: 2008-07-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1412278A adopts strong acid, such as sulfuric acid, as a catalyst to carry out esterification and transesterification treatment of waste oil and palm oil with high acid value. This method corrodes the reactor seriously and produces a large amount of waste water
CN1556174A uses high acid value (10~150mgKOH / g oil) animal and vegetable oil to make biodiesel, uses strong acid as catalyst to carry out esterification, and then uses strong base as catalyst to carry out transesterification, a large amount of waste water is produced in the reaction process, causing environmental pollution
J.M.Marchetti et al. [Fuel, 2007, 86:906-910] used Dowex monosphere 550 A resin to catalyze the reaction of oil containing high free acid to prepare fatty acid methyl ester. This method avoids the corrosion of the reactor, but the resin is expensive and the product unavailable problem
CN1718679A adopts solid acid catalyst to produce biodiesel, but the reaction is carried out in an autoclave, the reaction temperature is 130~180°C, the pressure is 1~8MPa, and the conditions are relatively harsh

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Palm oil and methanol with an acid value of 181.7mgKOH / g are added to the three-necked flask with a molar ratio of 1:6, and the solid superacid SO with an oil weight of 5wt% is added. 4 2- / ZrO 2 Catalyst, control the reaction temperature at 60-62°C, stir and reflux with a heat-collecting magnetic stirrer for 4 hours, centrifuge the catalyst, leave the crude product to stand and separate, take the methyl ester layer and measure its acid value to 6.5mgKOH / g, the ester The transformation rate is 96.4%.

[0015] Add the methyl ester phase and methanol with an acid value of 6.5mgKOH / g into the three-necked flask at a molar ratio of 1:6, and add solid superacid SO with an oil weight of 5wt%. 4 2- / ZrO 2 Catalyst, control the reaction temperature at 60-62°C, stir and reflux reaction with a heat-collecting magnetic stirrer for 4 hours, centrifuge the catalyst, leave the crude product to stand and separate, take the methyl ester layer and measure its acid value to 0.7mgKOH / ...

Embodiment 2

[0017] Palm oil and methyl alcohol with an acid value of 181.7mgKOH / g are added to the three-necked flask with a molar ratio of 1:9, and the solid superacid SO with an oil weight of 3wt% is added. 4 2- / ZrO 2 Catalyst, control the reaction temperature at 68-69°C, stir and reflux with a heat-collecting magnetic stirrer for 2 hours, centrifuge the catalyst, leave the crude product to stand and separate, take the methyl ester layer and measure its acid value to 3.2mgKOH / g, the ester The transformation rate is 98.2%.

[0018] Add the methyl ester phase and methanol with an acid value of 3.2mgKOH / g into the three-necked flask with a molar ratio of 1:9, and add solid superacid SO with an oil weight of 5wt%. 4 2- / ZrO 2 Catalyst, control the reaction temperature at 68-69°C, stir and reflux with a heat-collecting magnetic stirrer for 2 hours, centrifuge the catalyst, leave the crude product to stand and separate, take the methyl ester layer and measure its acid value to 0.3mgKOH / g...

Embodiment 3

[0020] Palm oil and methanol with an acid value of 181.7mgKOH / g are added to the three-necked flask with a molar ratio of 1:6, and the solid superacid SO with an oil weight of 5wt% is added. 4 2- / TiO 2 Catalyst, control the reaction temperature at 62-63°C, stir and reflux reaction with a heat-collecting magnetic stirrer for 6h, centrifuge the catalyst, leave the crude product to stand and separate, take the methyl ester layer and measure its acid value to 14.4mgKOH / g, the ester The conversion rate was 92.0%.

[0021] Add the methyl ester phase and methanol with an acid value of 14.4mgKOH / g into the three-necked flask at a molar ratio of 1:6, and add solid superacid SO with an oil weight of 5wt%. 4 2- / ZrO 2 Catalyst, control the reaction temperature at 62-63°C, stir and reflux reaction with a heat-collecting magnetic stirrer for 6h, centrifuge the catalyst, leave the crude product to stand and separate, take the methyl ester layer and measure its acid value to 0.7mgKOH / g,...

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Abstract

The invention provides a method which uses palm oil to prepare biologic diesel oil and can lower the high acid value. The method uses solid super acids of SO>4<2- > / ZrO2, SO4< 2- > / TiO2, and SO4< 2- > / xZrO<2- yTiO2 as catalyst, and uses low-carbon alcohol as esterifying agent to pre-treat the high acid value palm oil, can effectively lower the acid value of the oil, and can ensure the acid vale of the obtained biologic diesel oil to easily meet the standard (less than 0.8mgKOH / g, ASTM). The catalyst used by the invention has high catalytic activity, and is reusable. The process flow is simple, the production cost is decreased, and the environmental pollution is reduced greatly.

Description

field of invention [0001] The invention belongs to biodiesel preparation technology. Background of the invention [0002] The main chemical components of animal and vegetable oils are fatty acid glycerides, and biodiesel and glycerin are obtained through transesterification of oils and monohydric low-carbon alcohols (methanol). Biodiesel has excellent combustion performance, and its cetane number, viscosity, and combustion heat index can all reach the standard of ordinary diesel oil. As a clean and renewable green energy, biodiesel has attracted more and more attention due to its excellent environmental protection characteristics, good safety performance (high flash point) and renewability. [0003] The traditional production method of biodiesel is to use alkali metal hydroxide with high solubility of oil in methanol as a homogeneous catalyst for transesterification reaction, which has high reactivity and fast rate. However, when an alkaline catalyst is used, the presence ...

Claims

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Application Information

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IPC IPC(8): C11C3/04C11C3/10C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 胡常伟童冬梅蔡伊莎祝良芳李桂英
Owner SICHUAN UNIV
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