China builds a coal-to-aromatic hydrocarbon industry chain

"The operation of the world's first 10,000-ton methanol-based aromatics industrial test plant fills the gap in the methanol-to-aromatic hydrocarbon industrialization technology and has enabled China to form a large-scale industrial chain of coal-to-aromatic hydrocarbons." Held at the Great Hall of the People in Beijing on April 11th. The news report on the technical results of coal-to-aromatic hydrocarbons sent out this exciting news. At this point, the large-scale industrial chain of coal-to-aromatic hydrocarbons together with the existing coal-to-olefins industrial chain has made China the first country in the world that is expected to use coal as raw material to produce all products of the petrochemical industry chain.

According to Jin Yong, an academician of the Chinese Academy of Engineering and a professor at Tsinghua University, among the three key technologies for the production of aromatics from coal as raw materials (coal gasification, methanol from synthesis gas, and aromatic hydrocarbon from methanol), coal gasification and methanol production from synthesis gas are both at home and abroad. There are mature technologies, and there is no technology that can be applied industrially in the most difficult part of the development of aromatic hydrocarbons from methanol. Therefore, the production of aromatic hydrocarbons from methanol has become a key strategic technology related to the implementation of China's oil substitution strategy, the realization of the deep transformation of coal resources and the efficient and clean use of coal resources.

After more than ten years of technological development, Tsinghua University has taken the lead in the international development of successful methanol-to-aromatics catalysts and fluidized-bed methanol-to-aromatic hydrocarbons that are ready for large-scale production and continuous reaction regeneration technology. Together with Huadian Group, it has developed its complete set of industrial technologies.

In January 2012, the world's first 10,000-ton methanol-to-aromatic industrial test facility was successfully tested at Huadian Coal Yulin Coal Chemical Industry Base. On March 18 this year, the technology was identified by the results of the China Petroleum and Chemical Industry Federation. The appraisal expert evaluated that the fluidized bed of the core unit has stable operation, high elasticity, high degree of continuity and automation, methanol conversion rate of up to 99.99%, low methanol consumption of aromatics per ton (about 3.07 tons of methanol to produce 1 ton of aromatics), stable catalyst activity, etc. .

Zhou Zhuye, vice president of the China Petroleum and Chemical Industry Federation, said that this technology is a major breakthrough in China's modern coal chemical technology field, and it is advancing the diversification of petroleum and chemical raw materials to meet the market's rapidly growing demand for aromatics and other basic organic materials. Safeguarding national energy security has important practical significance and strategic significance.

This technology also surprised the researchers. It is understood that coal-based methanol production process due to desulfurization, denitrification treatment, the preparation of aromatic products is more clean, while the high selectivity of the catalyst also makes the components of aromatic products far less than the petroleum-based route of the product components, As a result, the aromatics separation process avoids the complex process of extracting petroleum-based aromatics, and the energy consumption of products is greatly reduced. In addition, a large amount of hydrogen, which is by-produced from the methanol to aromatics process, and some of the lower alkanes can also be used as raw materials for the production of methanol, thereby greatly reducing the raw material consumption of methanol to aromatics.

Yundian, general manager of Huadian Group, stated that since the two key issues of fluidized bed reactor amplification and catalyst stability have now been effectively addressed, there is technical protection for the device to scale up to one million tons. Therefore, Huadian Group plans to During the year, the world’s first million-million-ton methanol industrial demonstration plant will be built at the coal chemical base in Yulin, Shaanxi Province. At that time, it will form an annual output of 10 million tons of coal, 3 million tons of coal-made methanol, 1 million tons of methanol-based aromatics, and 1.2 million tons of refined hydrocarbons. Terephthalic acid production capacity.

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