Process for removing oil and water from gas and recycling oil by adopting low-temperature methanol

The invention discloses a process for removing oil and water from a gas and recycling oil by adopting low-temperature methanol. According to the process, an oil-containing and water-containing feed gas enters an oil removal tower to remove the oil from the oil-containing and water-containing feed gas through the low-temperature methanol; low-temperature oil-containing methanol from the oil removal tower enters a secondary flash evaporation washing tower and is subjected to intermediate pressure flash evaporation and low-pressure flash evaporation; a liquid phase which is subjected to the flash evaporation enters an oil and water extractor for extracting; an oil phase serves as a product; after the water into which a small amount of the oil is dissolved is treated through an oil separating tower, a non-condensable gas at the top of the tower enters the a secondary flash evaporation tower; the oil at the upper part of the tower enters the oil and water extractor; water-containing methanol is obtained at the bot