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Preparation method of biological diesel

A biodiesel and vegetable oil technology, which is applied in the fields of biofuel, fat oil/fat refining, petroleum industry, etc., can solve the problems of harsh control conditions, high production cost, high pressure and temperature in the hydrolysis section

Inactive Publication Date: 2011-03-02
SHAANXI CHUNGUANG BIOLOGICAL ENERGY DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a medium-pressure hydrolysis transesterification process, its technical feature is that the two hydrolysis sections of oil pre-esterification and transesterification are continuously completed through two towers. The advantage lies in the high fatty acid content of the material in the esterification section, and the disadvantage lies in the pressure of the hydrolysis section. , The temperature is high (2.5Mpa~4.0Mpa; 230℃~240℃), the time is long (6~10h), the control conditions of the transesterification process are relatively harsh, and the equipment cost is high and the energy consumption is high
The advantages of high-temperature gas-phase transesterification technology are that the contact surface of the transesterification reaction is slightly larger, the speed is faster, and the transesterification time is short, but the transesterification reaction is carried out at high temperature (above 350°C) and high pressure (above 20Mpa), and the equipment requirements are very high. , high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 500kg of lard or other animal fats after removal of impurities and pretreatment to a water content of less than 1% and an acid value of 130±10mgKOH / , put it into a reactor and preheat it to 60°C, add 83kg of methanol at 60°C, and Add 20kg of concentrated sulfuric acid at 0.67kg / min under stirring, turn on the vacuum pump, maintain the negative pressure in the reactor at 0.098MPa, keep the temperature in the reactor at 75°C, and react for 2 hours to make the acid value in the system below 3mgKOH / g, and then Vacuum the water generated by the reaction and the unreacted methanol, and then follow the steps below.

[0032] a. The pre-esterified material is neutralized and washed by adding water, so that the pH is 5-7;

[0033] b. Remove water and a small amount of impurities through a separator;

[0034] c. Dehydration and drying through a flash evaporator with a vacuum of 0.098MPa;

[0035] d. Pump the material into the reaction kettle, raise the temperature to 75°C, ...

Embodiment 2

[0042] Take 500kg of rapeseed oil or other vegetable oils that have been removed and pretreated to have a water content of less than 1% and an acid value of 130±10mgKOH / , put it into a reactor and preheat it to 60°C, then add 125kg of methanol at 60°C, Add 22.5kg of concentrated sulfuric acid at 0.67kg / min under stirring, turn on the vacuum pump, maintain the negative pressure in the reactor at 0.098MPa, keep the temperature in the reactor at 75°C, and react for 2 hours to make the acid value in the system reach 3mgKOH / g Thereafter, the water generated by the reaction and the unreacted methanol were vacuumed off. Then carry out successively by a to i step described in embodiment 1.

Embodiment 3

[0044] Take 500kg of acidified oil or waste oil from catering industry or gutter oil which has been removed and pretreated to a water content of less than 1% and an acid value of 130±10mgKOH / . 62.5kg of methanol, add 15kg of concentrated sulfuric acid at 0.67kg / min under stirring, turn on the vacuum pump, keep the negative pressure in the reactor at 0.098MPa, keep the temperature of the reactor at 75°C, and react for 2 hours to make the acid value in the system reach Below 3mgKOH / g, the water generated by the reaction and the unreacted methanol should be vacuumed out. Then carry out successively by a to i step described in embodiment 1.

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Abstract

The invention discloses a preparation method of biological diesel. The method comprises the following steps: adding methanol and raw oil (various preprocessed greases) into a reaction kettle in the mol ratio of (4:1)-(8:1), adding acid, and carrying out pre-esterification under negative pressure; adding water to neutralize and wash, dehydrating, removing impurities, drying, sending into the reaction kettle, heating to 75 DEG C, adding alkali, and carrying out transesterification under negative pressure; separating out the glycerol methanol solution on the lower layer to obtain crude biological diesel; and carrying out tertiary molecular distillation to obtain fatty acid methyl ester containing C16, C18 and C20, thereby obtaining the biological diesel. The invention has the advantages that the method is simple and the overall esterification time is shortened by 1 / 2; the transesterification rate is higher than 93%; the dehydration, decoloring, degassing and other working procedures of the intermediate products are completed in one step, thereby shortening the process, reducing the energy consumption and lowering the cost; and the obtained product has stable quality, and all the technical indices achieve and even exceed the 0# diesel national standard.

Description

technical field [0001] The invention belongs to the technical field of preparing liquid hydrocarbon mixtures from oxygen-containing organic matter, and relates to a method for preparing biodiesel, in particular to a method for continuously preparing diesel by using waste animal and vegetable oils with high acid value as raw materials. Background technique [0002] At present, the industrial production of biodiesel at home and abroad is mainly based on the transesterification method. According to the pressure, temperature and material state of the transesterification reaction, it is divided into two methods: medium pressure hydrolysis transesterification process and high temperature gas phase transesterification process. As a medium-pressure hydrolysis transesterification process, its technical feature is that the two hydrolysis sections of oil pre-esterification and transesterification are continuously completed through two towers. The advantage lies in the high fatty acid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/10C11B3/12C10L1/02
CPCY02E50/13Y02E50/10
Inventor 李新生武庆博吴三桥刘成武林张志健冯自立侯忠福屈小文武婷武敏武社成纪建成武明成蒋文斌
Owner SHAANXI CHUNGUANG BIOLOGICAL ENERGY DEV
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