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Abstract The low temperature methanol washing technology is widely used in coal chemical process because of its advantages of mature and stable process, good selectivity, high degree of purification, cheap and readily available raw materials, energy saving and consumption reduction. The application of the technology was introduced in the process of coal to methanol, coal natgas and coal to oil, and some problems during the production run, such as the large consumption of methanol and the instability of the methanol water separation column. It is proposed that the reasonable solutions should be found to improve and optimize the process in the future.
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