How to solve the liquid carryover problem in the methanol vapor feed of methanol-to-olefins units?

The liquid carried in with the feed is due to a problem with the design of your methanol vaporizer; simply increase its vaporization capacity and properly control the flow rate and temperature. :)

This post was last edited by zryang on 2016-4-25 at 18:09. To increase the vaporization capacity, isn’t it by increasing the methanol feed rate? At all times, the carburetor is in a state of methanol-water gas-liquid equilibrium; the reaction pressure remains constant, and therefore the temperature at the carburetor outlet does not change, in my understanding

The last edit to this post was made by Newton’s Apple on 2018-3-30 at 19:07. I agree with the view expressed above: the methanol coming out of the carburetor is saturated methanol vapor, with a constant outlet pressure and temperature. A dew point remover can be installed at the lowest point of the gas pipeline, along with heating

The problem with liquid accumulation stems from the fact that the methanol vaporizer vaporizes saturated methanol vapor. After exiting the vaporizer, two control valves and a flow meter are installed on the pipeline support floor, which creates a pocket where liquid can accumulate. This is already a location prone to liquid buildup; any slight instability in operation can result in an accumulation of large amounts of liquid methanol there. This leads to a decrease in the temperature at the inlet of the vertical exchanger as well as the temperature of the reaction feed, and it can also cause dangerous situations such as water hammer in the pipelines. The current solution is to install steam coil heating around the section of pipe located on the ground, add a larger liquid collection tank at the bottom of the pipe, and fit a level gauge on this tank to monitor the liquid level at all times; this approach can provide a relatively reliable way to address this issue.