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Method for preparing second-generation biodiesel from acid oil

A second-generation biodiesel and acidified oil technology, which is applied in the field of acidified oil to prepare second-generation biodiesel, can solve the problems of difficult large-scale industrialization and application, easy pulverization and deactivation of the catalyst bed, and large acid value, etc. The effect of large-scale industrialization promotion and application, stable and reliable production process, and high utilization rate of raw materials

Pending Publication Date: 2022-06-03
FUZHOU UNIV ASSET MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, acidified oil has high fatty acid content and high acid value, and the hydrodeoxygenation reaction is carried out at high temperature and generates a large amount of water, which seriously affects the stability of the hydrodeoxygenation catalyst and causes the catalyst bed to be easily pulverized Inactivate
Therefore, when acidified oil is used as raw material to prepare second-generation biodiesel, the device needs to be shut down frequently to replace the catalyst, which cannot run stably for a long period of time, making it difficult to promote and apply it in large-scale industrialization

Method used

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  • Method for preparing second-generation biodiesel from acid oil
  • Method for preparing second-generation biodiesel from acid oil

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Embodiment 1

[0047] like figure 1 As shown, the present embodiment provides a method for preparing second-generation biodiesel from acidified oil, comprising the following steps:

[0048] S1. Pass the acidified oil raw material into the filter 1, filter and remove the solid impurities at a temperature of 100 ° C and an operating pressure of 1.0 MPa, then mix it with methanol and a liquid acid catalyst and pass it into the pre-esterification reactor 2, where the liquid acid catalyst Under the action of the pre-esterification reaction, a pre-esterification mixture is generated. Wherein, the molar ratio of methanol to acidified oil raw material is 1.25:1, the mass ratio of liquid acid catalyst to acidified oil raw material is 0.2:1, the operating temperature of pre-esterification reactor 2 is 90℃, the operating pressure is 0.12MPa, adding The liquid acid catalyst is concentrated sulfuric acid.

[0049] S2. Mix the pre-esterified mixture with water in a volume ratio of 1:1 and then pass it i...

Embodiment 2

[0055] like figure 1 As shown, the present embodiment provides a method for preparing second-generation biodiesel from acidified oil, comprising the following steps:

[0056] S1, pass the acidified oil raw material into the filter 1, filter and remove the solid impurities at a temperature of 150 ° C and an operating pressure of 2 MPa, then mix with isopropanol and p-toluenesulfonic acid and pass into the pre-esterification reactor 2, in the liquid The pre-esterification reaction is carried out under the action of an acid catalyst to generate a pre-esterified mixture. The molar ratio of isopropanol to acidified oil raw material is 1.1:1, the mass ratio of p-toluenesulfonic acid to acidified oil raw material is 0.5:1, the operating temperature of pre-esterification reactor 2 is 100°C, and the operating pressure is 0.1 MPa.

[0057] S2. Mix the pre-esterified mixture with water in a volume ratio of 0.8:1 and then pass it into the liquid-liquid separator 3, carry out liquid-liqu...

Embodiment 3

[0063] like figure 1 As shown, the present embodiment provides a method for preparing second-generation biodiesel from acidified oil, comprising the following steps:

[0064] S1. Pass the acidified oil raw material into the filter 1, filter and remove the solid impurities at a temperature of 80 ° C and an operating pressure of 0.5 MPa, then mix with ethanol and a liquid acid catalyst and pass it into the pre-esterification reactor 2, where the liquid acid catalyst Under the action of the pre-esterification reaction, a pre-esterification mixture is generated. Wherein, the molar ratio of ethanol to acidified oil raw material is 1.5:1, the mass ratio of liquid acid catalyst to acidified oil raw material is 1:1, the operating temperature of pre-esterification reactor 2 is 90 °C, the operating pressure is 0.15 MPa, adding The liquid acid catalyst is a low corrosive Bronsted acid ionic liquid.

[0065] S2. Mix the pre-esterified mixture with water in a volume ratio of 1.2:1 and th...

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Abstract

The invention discloses a method for preparing second-generation biodiesel from acidified oil, which comprises the following steps: 1) removing solid impurities from an acidified oil raw material, mixing the acidified oil raw material with alcohol and a liquid acid catalyst, and carrying out pre-esterification reaction to generate a pre-esterified mixture; 2) mixing the pre-esterified mixture with water, introducing the mixture into a liquid-liquid separator, and separating a water phase to obtain a pre-esterified product I; 3) mixing the pre-esterification product I with a vulcanizing agent and H2, and performing hydrogenation reaction to generate a product II; 4) separating an oil phase from the product II, mixing the oil phase with H2, introducing the mixture into a hydroisomerization reactor, and reacting to generate a product III; and 5) introducing the product III into a second gas-liquid separator, introducing the separated liquid phase product III into a fractionating tower, and separating to obtain a second-generation biodiesel product. The production process provided by the invention is stable and reliable, high in raw material adaptability, relatively low in production cost, mild in condition and high in raw material utilization rate. In addition, the catalyst does not need to be frequently stopped and replaced, can stably run for a long period and is easy to industrially implement.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method for preparing second-generation biodiesel from acidified oil. Background technique [0002] With the progress of human civilization and the development of modern industry, the demand for energy in the world is also increasing rapidly. For a long time, fossil fuels represented by coal, oil and natural gas have dominated the world's energy consumption structure. However, the burning of fossil fuels will bring about a series of environmental problems such as global warming, acid rain, and smog. Fossil fuels are a non-renewable energy source, and their reserves are becoming increasingly depleted with the rapid growth of the global population. Therefore, the development of new and clean renewable energy is imminent. Biodiesel refers to a biofuel that can be used as a substitute for petrochemical diesel by a series of chemical treatments using animal and veget...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00C10G67/14C11C3/04
CPCC10G3/42C10G67/14C11C3/04C10G2300/70C10G2400/04Y02P30/20
Inventor 黄宽江莉龙曹彦宁马永德蔡镇平
Owner FUZHOU UNIV ASSET MANAGEMENT CO LTD