A glycerin aromatization method

An aromatization and glycerol technology, which is applied in organic chemistry, bulk chemical production, hydrocarbon production from oxygenated organic compounds, etc. The effect of promoting smooth development, changing the dependence of petrochemical raw materials, and simple process flow

Inactive Publication Date: 2015-08-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the use of petroleum, a large amount of harmful substances will be emitted, such as carbon dioxide, nitrides, sulfides, especially carcinogenic hydrocarbons such as benzene, which will pose a great threat to the human body and the natural environment; coal mining and Utilization has also caused serious ecological damage and environmental pollution, such as surface subsidence, loss and pollution of water and soil resources, and pollution of the atmospheric environment.
In addition, with the continuous improvement of living standards and the continuous increase of population, the demand for energy is getting higher and higher, but blindly relying on non-renewable oil and coal is not conducive to the sustainable development of our country
Furthermore, in the aromatization reaction of low-carbon hydrocarbons or methanol, most of them need to be designed as a multi-stage reaction in order to effectively increase the content of aromatics in the product, and the process flow is relatively cumbersome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Mix glycerin with water, methanol, ethanol, isopropanol and isobutanol at a ratio of 10% glycerin mass concentration, heat and vaporize at 290°C, and then pump it into a fixed tank filled with hydrogen-type ZSM-5 molecular sieve catalyst. Bed reactor, operated under normal pressure, at a reaction temperature of 400°C and a mass space velocity of 0.96h -1 The reaction is carried out under certain conditions, and it is converted into aromatic hydrocarbon-based products through catalytic conversion;

[0021] 2) The reaction product is condensed and separated to obtain a liquid phase product and a gas phase product, the liquid phase product is separated by rectification to obtain aromatics and non-aromatics, and the gas phase product is returned to the reactor to continue the reaction.

[0022] See Table 1 for the comparison of the reaction results of Comparative Example and Example 1.

Embodiment 2

[0024] 1) Mix glycerin and isopropanol at a ratio of 20% glycerin mass concentration, heat and vaporize at 290°C, and pump them into the In a fixed bed reactor with 22 molecular sieve catalysts, operate under normal pressure, at a reaction temperature of 400°C and a mass space velocity of 0.96h -1 The reaction is carried out under certain conditions, and it is converted into aromatic hydrocarbon-based products through catalytic conversion;

[0025] 2) The reaction product is condensed and separated to obtain a liquid phase product and a gas phase product, the liquid phase product is separated by rectification to obtain aromatics and non-aromatics, and the gas phase product is returned to the reactor to continue the reaction.

[0026] The reaction results are compared in Table 2.

Embodiment 3

[0028] 1) Glycerin and isobutanol are mixed according to the ratio of glycerol mass concentration of 30%, heated and vaporized at 290°C, and then pumped into fixed-bed reactors filled with MCM-41 molecular sieve catalysts, operated under normal pressure, at The reaction temperatures are 350°C, 400°C, and 450°C respectively, and the mass space velocity is 0.96h -1 The reaction is carried out under certain conditions, and it is converted into aromatic hydrocarbon-based products through catalytic conversion;

[0029] 2) The reaction product is condensed and separated to obtain a liquid phase product and a gas phase product, the liquid phase product is separated by rectification to obtain aromatics and non-aromatics, and the gas phase product is returned to the reactor to continue the reaction.

[0030] The reaction results are compared in Table 3.

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Abstract

A glycerin aromatization method is disclosed. The method is characterized in that glycerin is adopted as a raw material and is mixed with one or more selected from water, methanol, ethanol, isopropanol or isobutanol according to a certain ratio; the mixture is heated, gasified and fed into a fixed bed reactor filled with a catalyst; the catalyst adopts one of ZSM-5, SBA-15, ZSM-22, MCM-41 or MCM-22 zeolite as a carrier and adopts one or more selected from zinc, gallium, copper, tin, platinum or molybdenum as active component(s); an aromatization reaction is performed at 300-500 DEG C under 0.01-5.0 MPa with the weight hourly space velocity being 0.01-10.0 h<-1>; a liquid product obtained by condensation and separation after the reaction mainly comprises light aromatic hydrocarbons (benzene, toluene and xylene); the raw material conversion ratio is 95-100%; and the yield of BTX aromatic hydrocarbons is 30-70%. The raw material of the process is cheap, easily available, and rich in source. The whole process is reasonable. The method is low in environment pollution, high in raw material conversion ratio and high in product yield.

Description

technical field [0001] The invention relates to a production method for preparing light aromatic hydrocarbons (BTX) by using glycerin as raw material through aromatization. Background technique [0002] Since the last century, in order to slow down the dependence on fossil fuels and reduce the rising rate of greenhouse gas emissions in the atmosphere, biodiesel, as a green and renewable energy source, has been favored, and the biodiesel industry has also developed vigorously, but with this At the same time, a large amount of by-product glycerin is also generated, which makes the glycerin market oversupplied and the price drops rapidly. How to convert glycerin into high value-added chemicals by using new processes and technologies has become the key and guarantee for the sustainable development of the biodiesel industry. As far as the current research on the deep processing of glycerin is concerned, the research hotspots mainly focus on converting glycerin into derivatives s...

Claims

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Application Information

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IPC IPC(8): C07C15/04C07C15/06C07C15/08C07C1/20
CPCY02P20/52
Inventor 肖国民肖为引王飞徐威
Owner SOUTHEAST UNIV
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