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Esterification reaction tech. of preparing biodiesel by waste oil

A technology of esterification reaction and biodiesel, which is applied in the petroleum industry, biological raw materials, biofuels, etc., can solve the problems affecting the yield of biodiesel, and achieve the effects of convenient product post-processing, high catalyst activity, and less by-products

Inactive Publication Date: 2007-07-18
江苏悦达卡特新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in the esterification reaction, while the oil is continuously dehydrated to form fatty acid methyl esters, methanol is continuously evaporated, and the speed of the next step of the transesterification reaction and the yield of biodiesel are affected due to the decrease in the concentration of methanol.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Settling the mixture of scraps and acidified oil after recovering vegetable oil refining, and separating out impurities, adding 97% waste oil and 3% solid acid catalyst of porous carrier into the reaction kettle by weight percentage, the solid acid catalyst Using CaO or SiO 2 , the reaction temperature is controlled to be greater than 95°C to 110°C, gaseous methanol is introduced under normal pressure, and stirred for 1 to 4 hours to carry out esterification reaction, while gaseous methanol enters continuously from the bottom or lower part of the reactor to carry out esterification reaction with oil, and its transformation The rate is above 97%. After the reaction, the solid acid catalyst is separated, and the acid value of the oil after the esterification reaction can be reduced to 0.5mmKOH / g, and then the liquid after the esterification reaction is transesterified with methanol and a basic catalyst. Biodiesel can be produced after static reaction or centrifugation.

Embodiment 2

[0010] Heat the mixed waste oil of recovered animal fat, gutter oil and various food waste oils to 70-90°C, settle and separate the sundries, and mix 99.8% waste oil and 0.2% solids of porous carrier by weight percentage The acid catalyst is added to the reactor, and the solid acid catalyst uses TiO 2 or TiO 2 -SiO 2 ,, the reaction temperature is controlled to be greater than 100-110°C, gas-phase methanol is introduced under normal pressure, stirred for 2-3 hours to carry out esterification reaction, and gas-phase methanol enters continuously from the bottom or lower part of the reactor to carry out esterification reaction with oil, and its transformation The rate is 97%. After the reaction, the solid acid catalyst is separated, and the acid value of the oil after the esterification reaction can be reduced to 0.5mmKOH / g, and then the liquid after the esterification reaction is transesterified with methanol and a basic catalyst. , Biodiesel can be obtained after standing or ...

Embodiment 3

[0012] Heating the recovered waste oil to 50-70°C, settling and separating the impurities, adding 99% waste oil and 1% porous carrier solid acid catalyst into the reaction kettle by weight percentage, the solid acid catalyst adopts silicon For algae earth or kaolin, the reaction temperature is controlled to be greater than 110-120°C, gas-phase methanol is introduced under normal pressure, and stirred for 3-4 hours to carry out esterification reaction, and gas-phase methanol enters continuously from the bottom or lower part of the reactor to carry out esterification reaction with oil , the conversion rate is 98%. After the reaction, the solid acid catalyst is separated, and the acid value of the oil after the esterification reaction can be reduced to 0.5mmKOH / g, and then the liquid after the esterification reaction is carried out with methanol and a basic catalyst Biodiesel can be produced by transesterification reaction, standing still or centrifuging.

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Abstract

The esterification reaction process for preparing biodiesel oil with waste oil includes the following steps: adding waste oil in 97-99.8 wt% and solid acid catalyst in porous carrier in 0.2-3 wt% into reaction kettle, esterification reaction at temperature of 95-130 deg.c and normal pressure while introducing gaseous methanol and stirring for 1-4 hr, and separating out the solid acid catalyst after finishing reaction. The present invention has the features of fully esterification reaction, low power consumption and high biodiesel oil converting rate, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, in particular to an esterification reaction process for preparing biodiesel from waste oil. Background technique [0002] Biodiesel uses various animal and vegetable oils as raw materials, undergoes transesterification with methanol and other low-carbon alcohols, and finally turns it into a fuel for internal combustion engines—fatty acid methyl esters. Biodiesel has excellent environmental protection performance, low sulfur content, the emission of sulfur dioxide and sulfide is about 30% lower than that of ordinary diesel, the oxygen content can reach 11%, and the ignition performance is good, so the harmful substances such as HC and CO emitted during combustion Compared with ordinary diesel oil, it is greatly reduced. Since its emission does not contain harmful substances such as sulfur dioxide, lead, and halogen, it is very conducive to environmental protection and meets environmental protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor 张伟明
Owner 江苏悦达卡特新能源有限公司
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