Method of manufacturing biological diesel oil from hogwash oil

A biodiesel and gutter oil technology, which is applied in the preparation of biological raw materials, biofuels, liquid hydrocarbon mixtures, etc., can solve the problems affecting the yield of biodiesel, and achieve the effects of low cost, less by-products, and less pollution

Inactive Publication Date: 2007-08-08
张伟明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

[0011] Heating the recovered waste oil to 70-90°C, settling and separating the impurities, adding 97% of the waste oil and 3% of the solid acid catalyst of the porous carrier into the reaction kettle by weight percentage, and the solid acid catalyst adopts CaO or SiO 2 , the reaction temperature is controlled to be greater than 95°C, gaseous methanol is introduced under normal pressure, and stirred for 1 to 4 hours to carry out esterification reaction, and gaseous methanol enters continuously from the bottom or lower part of the reactor to carry out esterification reaction with oil, and the conversion rate is 97 % or more, after the reaction finishes, separate out the solid acid catalyst. Put 70-75% of the liquid after the esterification reaction, 15-25% of methanol and 3-5% of the solid base catalyst into the reactor according to the weight percentage. The solid base catalyst adopts CaO or MgO, and the reaction temperature is controlled at 50 ℃~65℃, stir under normal pressur...

Embodiment 2

[0013] Heating the recovered waste oil to 70-90°C, settling and separating the impurities, adding 99.8% of the waste oil and 0.2% of the solid acid catalyst of the porous carrier into the reactor by weight percentage, the solid acid catalyst adopts 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 yield was 97.2%. After the reaction was finished, the solid acid catalyst was separated. Put 75-80% of the liquid 15-20% methanol and 3-5% of the solid base catalyst into the reactor after the esterification reaction by weight percentage. The solid base catalyst is ZnO or SrO, and the reaction temperature is controlled at 55°C. ~60°C, stir under normal pressure for ...

Embodiment 3

[0015] Heating the recovered waste oil to 70-90°C, settling and separating out impurities, adding 99% waste oil and 1% porous carrier solid acid catalyst into the reactor by weight percentage, the solid acid catalyst adopts silicon For algae earth or kaolin, the reaction temperature is controlled to be greater than 120-130°C, gas-phase methanol is introduced under normal pressure, stirred for 1-2.5 hours for esterification, and gas-phase methanol is continuously fed into the reactor from the bottom or lower part of the reactor to be mixed with oil The esterification reaction was carried out, and the conversion rate was 98%. After the reaction was finished, the solid acid catalyst was separated. Put 70-75% liquid 20-25% methanol and 1-5% solid alkali catalyst into the reaction kettle after the esterification reaction according to the weight percentage. The solid alkali catalyst adopts CaO-MgO, and the reaction temperature is controlled at 55°C. ~60°C, stirring under normal pres...

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Abstract

The invention discloses a making method of biological diesel through trench oil, which comprises the following steps: A. adding 97-99.8% trench oil and 0.2-3% solid acid catalyst of porous carrier into autoclave; controlling reacting temperature between 95 and 130 deg.c; aerating gas-phase carbinol; stirring 1-4h; esterifying; separating solid acid catalyst; B. adding 70-80% liquid, 15-25% carbinol and 1-5% solid alkaline catalyst into autoclave; controlling the reacting temperature between 50 and 65 deg.c; stirring under normal pressure for 0.5-2h; proceeding ester exchange reaction; C. stewing liquid or centrifuging; adopting upper layer as product and lower layer as glycerine, solid alkaline catalyst and carbinol.

Description

technical field [0001] The invention relates to a method for preparing biodiesel, in particular to a method 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 protection requirements. Therefor...

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 张伟明
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