Dimethyl ether reflux problem
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In the production of dimethyl ether, what should be the reflux ratio controlled to be economical? ? How high should the temperature of the tower reactor circulating fluid be controlled?
The temperature at the top of the tower is around 40°C, and the temperature at the bottom of the tower is around 140°C.
Temperature control is related to tower pressure and cooling water.
The experience of driving for several years is only for reference. The reflux ratio is mainly based on the required quality requirements. If it is carried out according to the standards, generally 0.9~1 is more economical. Temperature is related to operating pressure and season. Currently, the pressure at the bottom of the northern tower is 7.7 kg, the temperature of the tower kettle is about 133 degrees, and the temperature at the top of the tower is between 37 and 40 degrees.
It is related to the processing capacity of the distillation tower, and the size of the reflux ratio is not a dead number. The reflux ratio is also different depending on the load. Through laboratory testing, as long as the dimethyl ether is qualified, the reflux ratio can be adjusted downward until the dimethyl ether is just qualified. This is the most steam-saving. However, in order to ensure product quality, it is appropriate to be slightly smaller than this value. When our device is fully loaded, the return flow ratio is 0.6-0.7 ； 0.5 is qualified at half load. The temperature at the top of the tower is 40 degrees and the temperature at the bottom is 145 degrees.
I wonder what the dimethyl ether content is on the 5th floor?
I wonder what the dimethyl ether content is on the 5th floor?
The reflux ratio is indeed related to the processing capacity of the distillation tower, which is mainly reflected in the number of trays, tower height and diameter. As long as these three items are constant values, then its reflux ratio is basically determined. The control should also be adjusted according to the actual situation. While ensuring that the product is qualified, the reflux volume should be kept as low as possible. The temperature at the top of the tower should refer to the saturated vapor pressure comparison table of dimethyl ether. Different operating pressures correspond to different temperatures. Our 100,000-ton production capacity has a reflux ratio of about 0.7-0.9, a tower pressure of about 0.7MPa, a tower top temperature of about 35, and a tower kettle of about 135.