Method for preparing benzene toluene xylene (BTX) by aromatizing glycerinum

Abstract

The invention discloses a method for preparing benzene toluene xylene (BTX) by aromatizing glycerinum. The method is characterized by comprising the steps of taking the glycerinum as a raw material, mixing the glycerinum with one or more solvents of water, methyl alcohol, ethanol, isopropanol or isobutanol according to a certain proportion, heating and gasifying the mixture, and charging the mixture into a fixed bed rector filled with a catalyst, wherein the catalyst takes one or more of ZSM-5, SBA-15, ZSM-22, MCM-41 or MCM-22 zeolite as a carrier, and takes one or more of zinc, gallium, copper, tin, platinum or molybdenum as an active component; enabling the mixture to perform an aromatization reaction at 300-500 DEG C under the reaction pressure of 0.01-5.0 MPa at the mass space velocity of 0.01-10.0 h<-1>; after reaction, condensing and separating to obtain a liquid product, wherein the liquid product mainly comprises the BTX (including benzene, toluene and xylene), the conversion rate of the raw material is 95-100%, and the BTX yield is 30-70%. The method for preparing BTX by aromatizing the glycerinum has the advantages that the raw material is cheap and is easy to obtain, the source of the raw material is abundant, the whole technical process is reasonable, the environment pollution is small, the conversion rate of the raw material is high, and the yield of products is high.

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...

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

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