New progress has been made in the study of methanol and carbon monoxide coupling for aromatics

Recently, Liu Zhongmin and Zhu Wenliang of the National Engineering Laboratory of Methanol Olefins of Dalian Institute of Chemical Physics of the Chinese Academy of Sciences made new progress in the study of aromatics made by the coupling of methanol and carbon monoxide. The study was published in a newsletter, Angew. Chem. Int. Ed.) and was rated Hot Paper.
(benzene, toluene, xylene) is an important basic chemical raw material, its output and scale is second only to ethylene and propylene
China
. At present, large-scale industrial production of aromatics is achieved through a joint aromatic device made of tarot oil. In recent years, China's polyester industry has developed rapidly, the consumption of aromatics has risen rapidly, and the supply gap has increased year by year. Therefore, it is very important to speed up the production of aromatics and develop the new technology of aromatics for the healthy development of polyester industry in China. Due to the shortage of petroleum resources, abundant coal, clean and efficient supply of energy and chemicals has become an urgent problem to be solved in the development of the country. The development of coal-to-methanol aromatics and other chemical technologies is of great significance for reducing the external dependence of crude oil and ensuring national energy security, and the market prospects are broad. Methanol aromatic reactions often use the selective ZSM-5 molecular sieve as a catalyst. Because of the presence of hydrogen transfer reaction, the generation of aromatics is accompanied by the generation of alkanes, aromatic selectivity needs to be further improved.
this work, the researchers found that methanol and carbon monoxide can be coupled on a pure H-ZSM-5 molecular sieve without metal-modified, resulting in about 80% aromatic selectivity. In addition, the work also proposed a new aromatic mechanism: methanol and carbon monoxide on H-ZSM-5 carbide reaction to produce carbide intermediates, and then react with olefins to produce cycloquine-type intermediates, by dehydration to obtain aromatic hydrocarbons. Through 13C nuclear magnetism and isotope tracer, it is proved that carbon monoxide can enter aromatic hydrocarbons and cycloenecondone intermediates. As the carbon part of carbon monoxide enters the aromatics, relative to methanol directly produces aromatic hydrocarbons, it can increase the yield of aromatics, which is conducive to improving the economicity of the industrialization process.
the above-mentioned research work is supported by the National Natural Science Foundation of China.
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