Methanol cooling and recycling process

Abstract

The invention discloses a methanol cooling and recycling process which comprises the steps of carrying out first heat exchange treatment on gaseous methanol at a first temperature and water vapor at a second temperature generated by a water cooling tower so as to obtain liquid methanol at a third temperature after the gaseous methanol is subjected to the first heat exchange treatment. The first heat exchange treatment is carried out on gaseous methanol at the first temperature and water vapor at the second temperature generated by the water cooling tower, so that the gaseous methanol is converted into liquid methanol to cause phase change between the gaseous methanol and the liquid methanol, and the phase change process needs to consume a lot of energy sources. However, the water vapor which is exhausted by the water cooling tower and should enter the air is used as a heat exchange medium, so that energy is greatly saved, and great economic benefits are generated.

Description

technical field [0001] The invention relates to the technical field of methanol recovery and cooling, in particular to a methanol cooling and recovery process. Background technique [0002] At present, there are two methods for producing dimethyl ether from methanol dehydration: liquid-phase method and gas-phase method. Distillation process. The production of dimethyl ether from methanol gas phase dehydration is the most mature and widely used production method of dimethyl ether in industry. [0003] In the process of producing dimethyl ether, the treatment of the generated wastewater is divided into two situations: one is the situation where a methanol recovery tower is installed, through the treatment of the recovery tower, the content of the wastewater exceeds 0.5-10%, and the temperature is 120 °C The alcohol-containing liquid at ~140°C is extracted, recovered, and reused. However, although a methanol recovery tower is installed, the recovery efficiency is still very l...

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Problems solved by technology

[0003] In the process of producing dimethyl ether, the treatment of the generated wastewater is divided into two situations: one is the situation where a methanol recovery tower is installed, through the treatment of the recovery tower, the content of the wastewater exceeds 0.5-10%, and the temperature is 120 °C The alcohol-containing liquid at ~140°C is extracted, recovered, and reused. However, although a methanol recovery tower is installed, the recovery efficiency is still very low, and the separation of methanol in wastewater through the methanol recovery tower still consumes a huge amount of energy; The other is the situation where no methanol recovery tower is installed. The wastewater treated by the gasification tower is directly discharged into the waste water tank for treatment. In this process, whether the methanol content of the wastewater treated by the gasification tower exceeds 50ppm or the methanol content is not monitored. More than 0.5%, if the content exceeds the standard, it will increase the workload of the follow-up sewage tank, and cause waste of methanol, and increase the amount of methanol used in the production of dimethyl ether

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