Catalytic distillation production method for biodiesel

A technology of biodiesel and catalytic distillation, which is applied in the fields of biofuel, petroleum industry, fatty acid esterification, etc., can solve the problems of wastewater treatment, limiting the source of biodiesel raw materials, environmental pollution, etc., so as to reduce consumption, have a good market prospect, The effect of amplifying the source

Inactive Publication Date: 2012-08-08
SOUTHEAST UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

CN102206552A discloses a method for preparing biodiesel by vapor-liquid-solid heterogeneous catalysis. The solid acid catalyst is packed in the reaction tower, the lower part of the tower is fed with low-carbon alcohol vapor, and the upper part is sprayed with liquid fatty acid. Esterification reaction occurs, although the conversion rate of fatty acid is high (98%) in this method, but because only the esterification process of fatty acid is involved, the raw material source of biodiesel is greatly limited
CN1861752A discloses a method for producing biodiesel by using waste oil with high acid value, using solid iron trichloride to catalyze the esterification reaction between free fatty acid in waste oil and low-carbon alcohol, and then washing and removing ferric chloride with low-carbon alcohol , and then use sodium hydroxide and potassium hydroxide to convert the pre-esterified residual oil into biodiesel through transesterification. Although this method adopts the pre-esterification process and expands the source of raw materials, a homogeneous alkali is still required in the later stage of the reaction. Catalysis, which will inevitably bring problems such as wastewater treatment and environmental pollution
[0005] In the traditional biodiesel production process, there are still problems of excessive methanol consumption and high energy consumption in the separation process

Method used

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  • Catalytic distillation production method for biodiesel
  • Catalytic distillation production method for biodiesel

Examples

Experimental program
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Effect test

example 1

[0032] (1) Pump the gutter oil into the device through the grease feed pump P-101 at a flow rate of 10.0 kg / h, and preheat it to 65°C through the grease preheater E-101, while methanol is injected at a flow rate of 1.53 kg / h Pumped into the device through the low-carbon alcohol feed pump P-102, and preheated to 65°C through the low-carbon alcohol preheater E-102;

[0033] (2) Pass the preheated waste oil into the upper part of the catalytic rectification tower filled with solid acid or alkali catalyst, and pass the preheated methanol into the catalytic rectification tower filled with solid acid or alkali catalyst at a flow rate of 1.53kg / h In the lower part, the two are in countercurrent contact, and esterification or transesterification occurs on a solid acid or alkali catalyst bed;

[0034] The operating conditions of the catalytic rectification tower are normal pressure, reflux ratio 1.0, tower top temperature 64.6°C, tower bottom temperature 186.0°C;

[0035] The height o...

example 2

[0038] (1) Pump the frying waste oil into the device through the oil feed pump P-101 at a flow rate of 12.0 kg / h, and preheat it to 70°C through the oil preheater E-101, and at the same time, add methanol at a flow rate of 1.60 kg / h The flow rate is pumped into the device through the low-carbon alcohol feed pump P-102, and preheated to 70°C by the low-carbon alcohol preheater E-102;

[0039] (2) Pass the preheated frying waste oil into the upper part of the catalytic distillation column filled with solid acid or alkali catalyst, and pass the preheated methanol into the catalytic distillation column filled with solid acid or alkali catalyst at a flow rate of 1.53kg / h. In the lower part of the distillation tower, the two are in countercurrent contact, and esterification or transesterification occurs on a solid acid or alkali catalyst bed;

[0040] The operating conditions of the catalytic rectification tower are normal pressure, reflux ratio 1.2, tower top temperature 64.3°C, to...

example 3

[0044] (1) Pump palm oil into the device through the oil feed pump P-101 at a flow rate of 22.0 kg / h, and preheat it to 78°C through the oil preheater E-101, while ethanol is fed at a flow rate of 4.61 kg / h Pumped into the device through the low-carbon alcohol feed pump P-102, and preheated to 78°C through the low-carbon alcohol preheater E-102;

[0045] (2) Pass the preheated palm oil into the upper part of the catalytic rectification tower packed with solid acid or alkali catalyst, and the ethanol is passed into the lower part of the catalytic rectification tower packed with solid acid or alkali catalyst at a flow rate of 9.32kg / h. Countercurrent contact, esterification or transesterification occurs on a solid acid or base catalyst bed;

[0046] The operating conditions of the catalytic rectification tower are normal pressure, reflux ratio 1.0, tower top temperature 77.6°C, tower bottom temperature 192.7°C;

[0047] The height of the solid base catalyst bed is 1.8m.

[0048]...

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Abstract

The invention provides a method for continuously producing biodiesel. The method comprises the following specific steps of: preheating grease and a low-carbon alcohol according to a certain proportion, and pumping into a catalytic distillation tower filled with a solid acid or a basic catalyst; feeding the grease from the upper part of the tower in a liquid form; feeding the low-carbon ethanol from the lower part of the tower in a steam form; inversely contacting the grease and the low-carbon ethanol; performing an esterification or ester exchange reaction on a solid acid or alkali catalyst bed layer in the tower; condensing the low-carbon alcohol evaporated on the top and making a part reflow to the tower top; circularly using the remaining part; and treating a bottom discharged material by using a sedimentation laminating device to obtain biodiesel from an upper layer and side product glycerol from a lower layer. A catalytic distillation process based on a solid acid or alkali catalyst is adopted, and reaction and separation processes are integrated, so that the consumption of a large quantity of low-carbon alcohols is lowered, and the yield of biodiesel is up to 99 percent; the solid acid or alkali catalyst can be used repeatedly; and the method for producing biodiesel has the advantages of energy saving, environmental friendliness, suitability for continuous scale production, and good market prospect.

Description

technical field [0001] The invention relates to a method for continuously preparing biodiesel, in particular to a method for producing biodiesel by catalytic rectification based on a solid acid or alkali catalyst, and belongs to the technical field of biodiesel preparation. Background technique [0002] Biodiesel is a kind of potential green renewable energy. Its performance is similar to that of petrochemical diesel, but it is superior to petrochemical diesel in terms of sulfur content, flash point, cetane number and clean combustion. It can be compared with petrochemical diesel at any Proportional mixing to prepare biodiesel blended fuel. [0003] In order to reduce the cost of biodiesel and expand the source of raw materials for biodiesel, various oils such as soybean oil, rapeseed oil, palm oil, lard, swill oil, gutter oil and frying waste oil can be used as raw materials. Alcohol esterification or transesterification and separation process to produce biodiesel. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11C3/04C11C3/10C10L1/02
CPCY02E50/13Y02E50/10
Inventor 肖国民肖洋高李璟李浩扬潘晓梅
Owner SOUTHEAST UNIV
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