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The summary of large methanol technology and its applications introduces in detail the concept and characteristics of large methanol technology of German Lurgi Company, focusing on Lurgi gas generation and methanol synthesis processes, and explains the broad application prospects of large methanol technology from the technical and economic aspects of methanol to propylene, methanol to dimethyl ether and methanol hydrogen production. Keywords: methanol process, MTP, MTH, technology progress and application. In recent years, the methanol market has been changing rapidly. Methanol plants sometimes operate at full capacity, sometimes reduce production or even stop production. The decision to make a major new investment in methanol production at this time does not seem to come at an ideal time. But from a long-term perspective, considering that most new natural gas resources are generally very far away from actual users and potential users, and considering the impact of environmental protection policies on alternative fuels, it is obvious that methanol has a huge potential demand as a clean, easy-to-transport fuel or chemical raw material - a medium that delivers the energy value of natural gas to the market. As a fuel, nothing is cleaner than methanol. No matter what raw material is used to make methanol, all impurities that harm the environment, such as sulfur, must be effectively removed during the production process, otherwise production cannot continue. Methanol produces much less NOx when burned normally than any hydrocarbon fuel, including methane. In today's most developed industries * * , NOx emissions in combustion exhaust gas must comply with strict restriction standards, so changing to cleaner fuel can significantly save the cost of NOx removal. Similarly, using methanol as a feedstock for sensitive chemical processes instead of primary feedstocks can eliminate the need for prior feedstock purification. Methanol is also a very suitable fuel for direct power generation in fuel cells. This makes methanol itself a promising vehicle fuel, rather than just being used as a gasoline additive or a raw material for making gasoline additives. Due to the huge gains made in internal combustion engines * * Benefits, therefore w. s. The auto industry has been "slowly advancing" fuel cell adoption, perhaps understandably, Giibert said. But the ultimate fact is that more than one major automaker is currently conducting active research. While most manufacturers do this to prevent future mandatory regulations rather than for general business reasons, it at least shows that the idea of fuel cell-powered transportation is no longer seen as more than a futuristic fantasy. Of course, using methanol in this way also has its inherent thermodynamic disadvantages, that is, during the methanol production process, initial energy is lost. 68 A large part of the energy of the raw materials. From this perspective, liquefied natural gas (LNG) is a more efficient energy transfer medium. But it has the disadvantages of being extremely capital intensive and less flexible. The liquefaction equipment, terminals, and vessels required to transport LNG are extremely expensive and serve the sole purpose of producing, transporting, and receiving LNG. In comparison, methanol can be transported in ordinary chemical tanks and does not require any very special interface facilities for loading, unloading and storage. Therefore, methanol can be supplied to many different users without the need for formal infrastructure. There is even a case where methanol can be produced by steam reforming (which should probably be called "re-reforming" since methanol is originally produced by steam reforming). ) and Fischer-Tropsch synthesis, or by direct conversion processes to convert methanol into hydrocarbons. Again, cleanliness and flexibility are key. First, producing hydrocarbons from methanol does not produce undesirable heavy residues such as fuel oil and asphalt. Secondly, the operation goal of producing hydrocarbons from methanol can be targeted at the production of special products or narrow range "fractions", unlike oil refining, which produces the entire range of fractions, which requires a large-scale integrated unit to balance the output of various products according to market demand. Unusual events can suddenly disrupt demand for a particular refined petroleum product, creating headaches for refiners. For example, after the recent damage to the World Trade Center in New York, demand for aviation-grade kerosene dropped sharply. To adjust this imbalance by chemically converting the fractions, it may be necessary to re-equip large complexes, but even this is not a simple matter. The problem is even greater for smaller, less flexible refineries. So while it may seem like the world is currently producing more methanol than it actually needs, in fact all it takes to open the door to "big methanol" is just a little change in conventional thinking. All mass-producing industrial companies will have to accept this change sooner or later, even those that have been producing the same product for decades.