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Continuous modular biodiesel preparation process

A technology of biodiesel and preparation technology, which is applied in the fields of biofuel, petroleum industry, fat oil/fat refining, etc. It can solve the problems of lack of flexibility and low efficiency of process operation, and achieve high efficiency of transesterification, process integration and high flexibility, The effect of high process efficiency

Pending Publication Date: 2021-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the currently published literature and patents, although the yield of biodiesel has been greatly improved, the separation of glycerin is mainly by gravity method, and the separated biodiesel needs to be further washed with water to obtain the glycerol content. Standard products; and process operation efficiency is low, lack of flexibility

Method used

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  • Continuous modular biodiesel preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Microchannel reaction module composition: 10 reaction tubes with an inner diameter of 5mm and a reaction zone length of 20cm are connected in parallel, and the catalyst in the tube is CaO (catalytic efficiency: 800kg biodiesel / kg catalyst); membrane separation module composition: 1 inner diameter 10mm, pore diameter 0.01μm microfiltration membrane module.

[0038] (2) Cottonseed oil and methanol are pumped into the microchannel reaction module with a molar ratio of 1:4 by a metering pump, the reaction temperature is controlled at 90°C, the pressure is 0.3Mpa, and the residence time is 25min, and the reaction solution is passed into the buffer tank;

[0039](3) The reaction solution in the buffer tank is pumped into the membrane separation module through the pressure regulating pump, and the temperature of the membrane separation module is controlled at 80°C, the transmembrane pressure difference is 30kPa, the circulation flow / production flow=1:0.1, and the permeation...

Embodiment 2

[0041] (1) Microchannel reaction module composition: 100 reaction tubes with an inner diameter of 0.05mm and a reaction zone length of 50cm are connected in parallel, and the catalyst in the tube is hydrotalcite (catalytic efficiency: 500kg biodiesel / kg catalyst); membrane separation module composition: 5 inner diameters of 6mm , Microfiltration membrane module with a pore size of 0.1 μm.

[0042] (2) Waste soybean oil and ethanol are pumped into the microchannel reaction module with a molar ratio of 1:3 by a metering pump, the reaction temperature is controlled at 70°C, the pressure is 0.2Mpa, and the residence time is 15min, and the reaction solution is passed into the buffer tank;

[0043] (3) The reaction solution in the buffer tank is pumped into the membrane separation module through the pressure regulating pump, the temperature of the membrane separation module is controlled at 50°C, the transmembrane pressure difference is 100kPa, the circulation flow / production flow=1:...

Embodiment 3

[0045] (1) Composition of microchannel reaction module: 1 reaction tube with an inner diameter of 10mm and a reaction zone length of 10cm, the catalyst in the tube is KF / hydrotalcite (catalytic efficiency: 2000kg biodiesel / kg catalyst); membrane separation module composition: 1 inner diameter of 7 channels (Channel inner diameter 3mm), microfiltration membrane module with pore size 1μm.

[0046] (2) Animal fat, n-propanol, and n-butanol are pumped into the microchannel reaction module by a metering pump at a molar ratio of 1:2:1.5. The reaction temperature is controlled at 120°C, the pressure is 0.4Mpa, and the residence time is 5min. Buffer tank;

[0047] (3) The reaction liquid in the buffer tank is pumped into the membrane separation module through the pressure regulating pump, the temperature of the membrane separation module is controlled at 10°C, the transmembrane pressure difference is 300kPa, the circulation flow / production flow=1:1, and the permeation flux is 290L / m ...

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Abstract

The invention relates to a continuous modular biodiesel preparation process, belonging to the technical field of green renewable energy sources. The continuous modular biodiesel preparation process is composed of a continuous microchannel reaction and microfiltration membrane separation. Specifically, the process comprises the following steps: 1) pumping grease and low-carbon alcohol into a microchannel reaction module dispersed with a heterogeneous basic catalyst through a metering pump according to a certain ratio, then allowing a formed mixture to flow into an intermediate buffer tank, pumping the mixture into a micro-filtration membrane separation module through a pressure regulating pump, and carrying out flash distillation on a discharged shell-pass penetrating fluid to obtain low-carbon alcohol, namely a biodiesel product; and 2) extracting a glycerol product from tube-pass discharge according to a certain recycle ratio, and refluxing the rest of the glycerol product to the front of the pressure regulating pump in a circulating manner. According to the process, the high-purity biodiesel product can be directly obtained, the content of glycerol in the product is less than 0.1%, high-efficiency production of the biodiesel at a low alcohol / oil ratio and high-efficiency low-energy-consumption separation of glycerol in the biodiesel product can be realized, and the process is high in modularization degree, low in energy consumption and capable of realizing high-efficiency preparation of biodiesel and flexible assembly of a refining system.

Description

technical field [0001] The invention belongs to the technical field of green renewable energy, and in particular relates to a continuous modular biodiesel preparation process. Background technique [0002] With the current restrictions on carbon dioxide emissions, carbon-neutral, abundant and renewable biomass resources have become potential alternative or supplementary energy sources, among which biodiesel is favored as the most easily applied and popularized green energy. The main component of biodiesel is fatty acid monoalkyl ester, the most typical of which is fatty acid methyl ester, which has the characteristics of high cetane number, non-toxic, sulfur-free, degradable, and aromatic-free, and can be directly replaced or combined with fossil diesel Used in combination, it can effectively improve the lubricity of low-sulfur diesel oil. [0003] Catalyzed or non-catalyzed chemical esterification and transesterification processes are commonly used technical means for biod...

Claims

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Application Information

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IPC IPC(8): C11C3/10C11B3/00C10L1/02
CPCC11C3/10C11B3/008C10L1/02Y02E50/10
Inventor 高李璟徐威肖国民魏瑞平雷严顾柳瑜
Owner SOUTHEAST UNIV
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