Method for rapidly producing biodiesel from kitchen garbage and produced biodiesel

A technology of biodiesel and kitchen waste, applied in the direction of biofuel, fat production, fatty acid production, etc., can solve the problems of difficult large-scale application, long reaction time, low reaction rate, etc., and achieve the goal of reducing high temperature and high pressure and production energy consumption Requirements, product post-processing is simple, the effect of mild reaction conditions

Inactive Publication Date: 2013-08-14
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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Problems solved by technology

The chemical catalysis method mainly uses acid or alkali to catalyze the transesterification of oil and alcohol to prepare biodiesel. The liquid acid-base catalysis method has been widely used in industry, but the catalyst is not easy to recover, glycerin is difficult to refine, and post-treatment produces more wastewater. Although the solid acid-base catalytic method can solve the problems of catalyst recovery and wastewater discharge, the reaction rate is low and the reaction time is relatively long
The preparation of biodiesel by biological enzyme catalysis has the advantages of mild conditions, simple separation, and less waste water. However, the cost of enzymes is high and the reaction time is long, so it is difficult to apply on a large scale in industry.
The supercritical transesterification method has the advantages of fast reaction rate, high conversion rate, easy separation and purification of products, etc., but the process requires high temperature and high pressure conditions
The Chinese patent application with the publication number CN101906355A discloses a method for producing biodiesel by using recovered oil from kitchen waste. and other steps are realized, the preparation process of this method is relatively long, and the operation process is relatively loaded down with trivial details

Method used

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  • Method for rapidly producing biodiesel from kitchen garbage and produced biodiesel

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Effect test

Embodiment 1

[0030] First, pre-treat the received food waste, sorting (removing solid impurities such as bones and gravel), crushing (breaking up the fat and meat in the food waste), vacuum dehydration (controlling the temperature at 100-150 ℃ , the vacuum degree is 0-5Kpa), and hogwash oil is obtained after pretreatment. Methanol and hogwash oil were weighed according to the mass ratio of methanol and hogwash oil as 220:100, and the catalyst was weighed according to the mass percentage of the alkali catalyst KOH accounting for 1% of the oil. After the catalyst is dissolved in methanol, it is mixed with hogwash oil and put into a high-pressure reactor, stirred and heated to 180°C, and the reaction pressure is controlled within the range of 1-10MPa. Stop the reaction after reacting for 12 minutes, cool the reaction kettle to room temperature, and recover excess methanol by distillation under reduced pressure. The upper layer product was analyzed by gas chromatography, and the conversion ra...

Embodiment 2

[0032] First, the received food waste is pretreated, sorted (removing solid impurities such as bones and gravel), crushing (breaking up the fat in the food waste), vacuum dehydration (temperature control 100-150°C, Vacuum degree is 0-5Kpa), hogwash oil is obtained after pretreatment. According to the mass ratio of methanol and hogwash oil is 80:100 to take methanol, hogwash oil, according to the alkali catalyst KNO 3 / Al 2 o 3 Accounting for 3% by mass of oil, the catalyst was weighed. Dissolve the catalyst in methanol, then mix it with hogwash oil and add it to the autoclave, pump carbon dioxide into the autoclave, adjust the molar ratio of carbon dioxide and methanol to 1:1, stir and heat, control the temperature at 80°C, and control the reaction pressure at 1 -10MPa range. Stop the reaction after reacting for 12 minutes, cool the reaction kettle to room temperature, and recover excess methanol by distillation under reduced pressure. The upper layer product was analyzed...

Embodiment 3

[0034]First, the received food waste is pretreated, sorted (removing solid impurities such as bones and gravel), crushing (breaking up the fat in the food waste), vacuum dehydration (temperature control 100-150°C, Vacuum degree is 0-5Kpa), hogwash oil is obtained after pretreatment. According to the mass ratio of methanol and hogwash oil is 60:100 to take methanol, hogwash oil, according to the solid acid catalyst SO 4 2- / TiO 2 The mass percentage of oil is 5% and the catalyst is weighed. Dissolve the catalyst in methanol, then mix it with hogwash oil and add it to the autoclave, then pump acetic acid into the autoclave, adjust the molar ratio of acetic acid to methanol to 8:1, stir and heat, control the temperature at 200°C, and control the reaction pressure In the range of 1-10MPa. After 20 minutes of reaction, the reaction was stopped, excess acetic acid was recovered by rotary evaporation, the reaction kettle was cooled to room temperature, and excess methanol was rec...

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Abstract

The invention provides a method for rapidly producing biodiesel from kitchen garbage and produced biodiesel. The method comprises the following steps of: (1) carrying out pretreatment: enabling the kitchen garbage to be subjected to sorting, crushing and vacuum dewatering, thereby obtaining hogwash oil; (2) weighing methanol and the hogwash oil in accordance with that the mass ratio of the methanol to the hogwash oil is (50: 100) to (500: 100), and weighing a catalyst in accordance with that the catalyst accounts for 0.05-5% by mass of the oil; (3) dissolving the catalyst in the methanol, and adding the hogwash oil and the methanol where the catalyst is dissolved to an autoclave for reacting for 3-60 min at the temperature of 80-350 DEG C and the pressure of 1-10 MPa; and (4) after the reaction is completed, carrying out reduced-pressure distillation, recovering excessive methanol, and enabling a product to be subjected to standing for layering, wherein a lower layer is glycerine, and an upper layer is the biodiesel. The method provided by the invention has the characteristics of short reaction time, mild reaction conditions and simple product post-processing.

Description

technical field [0001] The invention relates to the field of biodiesel preparation, in particular to a method for rapidly producing biodiesel from kitchen waste. Background technique [0002] Biodiesel is a long-chain fuel obtained by transesterification with methanol, ethanol and other low-carbon alcohols from oil crops such as soybeans, rapeseed, castor, peanuts, and palms, as well as engineering microalgae, animal fats, and waste cooking oil. Fatty acid monoalkyl esters. Biodiesel is a high-quality substitute for petrochemical diesel. The number of carbon atoms in fatty acids that make up biodiesel is mainly concentrated between C16-C18, which is basically the same as the number of carbon atoms in C15-C24 that make up petrochemical diesel, making the two have a relatively similar performance. Using waste cooking oil as a raw material for preparing biodiesel has the characteristics of low raw material cost compared with other raw materials. [0003] Waste cooking oil co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L1/02C11B13/00C11C3/00
CPCY02E50/13Y02E50/10Y02W30/74
Inventor 杨波王闻牟乐李志敏李茂东陈志刚林金梅喻文黄玉莲戴建红马新旭曾永忠余爱枝张辉钟志强
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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