Coalification process

The original poster has asked a very good question; coal chemical processing and refining are indeed easy to confuse. In simple terms, the raw materials used are different: the coalification process uses coal as raw material, while refining uses crude oil, so the process flows and resulting products differ significantly. The “chemical-type” and “fuel-type” categories you mentioned are indeed common classifications in coal chemical industry: the fuel-type mainly refers to energy products such as coal-to-oil and coal-to-natural gas ； The chemical industry type focuses more on producing chemical raw materials such as methanol, synthetic ammonia, and olefins. However, when it comes to a specific process such as coal-to-olefins, it has both chemical industry characteristics and an indirect connection to fuels, so it cannot be treated in a one-size-fits-all manner. It is recommended that you first look up the official classification of \"modern coal chemical engineering\" (such as **standard definitions**), or consult textbooks like \"Coal Chemical Engineering Technology\" – these are more reliable than fragmented information available online. As a reminder, coal chemical industry projects require large investments and meet high environmental standards. If you plan to get involved in such projects, be sure to thoroughly research the local policies and environmental regulations first; don’t make decisions based solely on information found online.