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Method for preparing biodiesel from biolipid

A technology of biodiesel and bio-oil, applied in the direction of fat oil/fat refining, biofuel, fat production, etc., can solve the problems of increasing the burden of recycling, consumption, large raw materials, etc., and achieve the effect of improving utilization rate

Active Publication Date: 2014-06-25
GUANGZHOU TAISHENG BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molar ratio of ester oil disclosed in the prior art (that is, the molar ratio of dimethyl carbonate to palm oil) is 20:1, which is far greater than the theoretical ratio required for transesterification, but the yield is only 83.11%. , it can be seen that this method consumes a large amount of raw materials, which increases the burden of recovery of unreacted raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Pretreatment of raw bio-oils: Add palm oil to the pretreatment tank, add 18% of palm oil mass in hot water with a water temperature between 90 and 95 °C, and keep stirring for 20 min, let it stand for precipitation, and make Impurities such as solid particles, phospholipids, and proteins in the oil are dissolved in water to form a liquid separation layer. The lower layer mixture is released from the bottom of the tank, and the upper layer of raw materials is dehydrated for 30 minutes under heating at 100°C with stirring to obtain the standard raw material oil.

[0039] (2) Transesterification reaction: Mix the standard raw oil and dimethyl carbonate with a molar ratio of 1:9 (890kg standard raw oil and 810kg dimethyl carbonate) in the reactor, then add 0.89kg of potassium hydroxide and mix to form For the mixed material, the reaction temperature of the mixed material is controlled at 280°C, the reaction pressure is 3.5 MPa, and the reaction time is 20 minutes under t...

Embodiment 2

[0043] (1) Pretreatment of raw bio-oil: Add waste oil to the pretreatment tank, add 30% of the waste oil mass in hot water with a water temperature between 90 and 95°C, stir continuously for 30 minutes, let stand to settle, and make the oil Impurities such as solid particles, phospholipids, and proteins in the tank are dissolved in water to form a liquid separation layer. The lower layer mixture is released from the bottom of the tank, and the upper layer of raw materials is dehydrated for 30 min under heating at 100°C with stirring to obtain standard raw material oils and fats.

[0044] (2) Transesterification reaction: Mix the standard raw oil and dimethyl carbonate with a molar ratio of 1:8 (910kg standard raw oil and 760kg dimethyl carbonate) in the reactor, then add 1.5kg potassium hydroxide to form Mix the material, control the reaction temperature of the mixed material to 300°C, the reaction pressure is 4MPa, the reaction time is 10min under the condition of fully stirri...

Embodiment 3

[0048] (1) Pretreatment of raw bio-oil: Add corn germ oil to the pretreatment tank, add 30% of the mass of corn germ oil and hot water with a water temperature between 90 and 95°C, and keep stirring for 30 minutes, let stand to settle, Dissolve solid particles, phospholipids, proteins and other impurities in the oil in water to form a liquid separation layer. The lower layer mixture is released from the bottom of the tank, and the upper layer of raw materials is dehydrated for 30 min under heating at 100°C with stirring to obtain the standard raw material oil.

[0049] (2) Transesterification reaction: Mix the standard raw oil and dimethyl carbonate with a molar ratio of 1:6 (840kg standard raw oil and 540kg dimethyl carbonate) in the reactor, then add 0.84kg of sodium hydroxide to form For the mixed material, the reaction temperature of the mixed material is controlled at 260°C, the reaction pressure is 5 MPa, the reaction time is 15 minutes under the conditions of sufficient ...

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PUM

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Abstract

The invention discloses a method for preparing biodiesel from biolipid and relates to the field of renewable new energy sources. The method comprises the three steps of (1) preprocessing the raw material biolipid; (2) carrying out an ester exchange reaction under the conditions that the mol ratio of the standard raw material lipid to dimethyl carbonate is 1: (3-9), the dosage of a solid alkali catalyst is 0.01-0.2% of the mass of the standard raw material lipid, the reaction temperature ranges from 250 to 300 DEG C, the reaction pressure ranges from 2 to 5 MPa and the reaction time is 8 to 30 minutes; (3) decoloring the crude diesel. The method solves the problem of glycerol excess in the production of the biodiesel with a short-chain alcohol as an ester-exchange reagent and also realizes the production possibility that the reaction yield is higher than 90% under the condition of a low ester-oil ratio; the obtained by-products can be directly used without being separated subsequently; the color of the prepared biodiesel can be between standard color solutions No. Y5 and No. Y6; in short, the method is a new green and environment-friendly method for preparing the biodiesel from the biolipid.

Description

technical field [0001] The invention relates to the field of renewable new energy, more specifically, to a method for preparing biodiesel from bio-oil. Background technique [0002] With the depletion of oil resources and the deterioration of air quality, biodiesel has attracted more and more attention. The main component of biodiesel is short-carbon fatty acid esters, which is a renewable liquid fuel produced by transesterification of vegetable oils (such as palm oil), animal oils (such as beef fat) and waste food oils (such as gutter oil). It has the advantages of being biodegradable, non-toxic and harmless to the environment, and is the best substitute for petrochemical diesel. The oxygen content in biodiesel is relatively high, and the calorific value in the combustion process is very close to that of petrochemical diesel, which makes it safer to burn. In addition, as a liquid fuel, biodiesel has almost no rotten effect on the engine. Biodiesel and petrochemical diesel...

Claims

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Application Information

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IPC IPC(8): C11C3/10C11B3/00C11B3/10C10L1/02
CPCY02E50/10
Inventor 曾宪洲段家贵
Owner GUANGZHOU TAISHENG BIOTECH
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