Separation refining method for ethylene preparation through ethanol dehydration
A technology of ethanol dehydration and refining method, applied in the direction of distillation purification/separation, organic chemistry, etc., which can solve the problems of high energy consumption, complicated process, low recovery efficiency, etc., and achieve improved ethylene yield, good technical effect, and easy operation Effect
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[0018] [Example 1]
[0019] The crude ethylene from the ethylene drying system enters the ethylene rectification tower for separation, the ethylene containing light components is separated at the top of the tower, and the heavy components are separated at the bottom of the tower. The flow rate of each component of crude ethylene is: hydrogen 0.070 kg / h, methane 0.070 kg / h, carbon monoxide 0.557 kg / h, ethylene 1,274.518 kg / h, ethane 7.060 kg / h, propane 1.555 kg / h, acetaldehyde 0.113 kg / h Hour, ether 5.631 kg / h, heavy component 33.957 kg / h. The reorganization of the ethylene rectification tower bottom is 83.977 kg / h, of which ethylene is 18.618 kg / h. The vapor phase at the top of the ethylene rectification tower enters the bottom of the light-removing tower with a flow rate of 5060.536 kg / h. The top temperature of the ethylene rectification tower is -24.8°C, the pressure is 2.15MPaG, the bottom temperature is 9.5°C, the number of theoretical plates in the whole tower is 80, and t...
Example Embodiment
[0024] [Example 2]
[0025] Same as Example 1, only changing the theoretical number of stages of the ethylene rectification tower: the number of theoretical plates in the whole tower is 92, the feed position is in the middle and lower part, and the others are the same as in Example 1. The reorganization of the ethylene rectification tower bottom is divided into 84.035 kg / h, of which ethylene is 18.631 kg / h. The vapor phase flow rate at the top of the ethylene rectification tower is 5061.121 kg / h, the temperature at the top of the ethylene rectification tower is -24.8°C, the pressure is 2.15MPaG, and the bottom temperature is 9.5°C.
[0026] The material mainly containing ethylene steamed from the top of the stripping distillation tower is recycled into the lower part of the ethylene rectification tower with a flow rate of 34.036 kg / h. The bottom of the tower discharges mainly containing ethane and C 3 + The flow rate is 50.0 kg / h, which contains 1.686 kg / h of ethylene. The top tem...
Example Embodiment
[0030] [Example 3]
[0031] Same as Example 1, only changing the theoretical stages of the stripping distillation column: the theoretical plate number of the whole column is 20, and the others are the same as in Example 1. The reorganization of the ethylene rectification tower and the bottom is divided into 82.667 kg / h, of which ethylene is 18.327 kg / h. The vapor phase flow rate of the top of the ethylene rectification tower is 5059.727 kg / h, the top temperature of the ethylene rectification tower is -24.8°C, the pressure is 2.15MPaG, and the bottom temperature is 10.0°C.
[0032] The material mainly containing ethylene steamed from the top of the stripping distillation tower is recycled into the lower part of the ethylene rectification tower with a flow rate of 32.667 kg / h. The bottom of the tower discharges mainly containing ethane and C 3 + The flow rate is 50.0 kg / h, which contains 1.691 kg / h of ethylene. The top temperature of the distillation column is 10.1°C, the pressure i...
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