Automatic control of intermittent distillation
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The control of tower top extraction and reflux in batch distillation has a wide flow range, 1: 20. Is there such a wide range of flow meters? What method is used to achieve smooth control? (Reflux ratio control) The heating of the distillation column kettle is carried out by steam, and a pneumatic regulating valve is used.
Consider using a vortex flowmeter (plus temperature and pressure compensation if necessary). The adjustable range can reach 1: 50 should be able to meet the process requirements. There are many control schemes for the reflux at the top of the tower. The best control scheme can be obtained according to the specific process requirements. Fixed reflux can be used when the requirements are not high. Temperature or pressure (whichever is the main factor affecting the discharge at the top of the tower, usually pressure) can be used to adjust the reflux flow if the requirements are high. If the requirements are higher, the liquid level of the buffer tank at the top of the tower can be used for cascade adjustment with the pressure or temperature at the top of the tower.
You can use the temperature of the tower kettle to control the reflux and get a relatively stable output concentration. I have done relevant research.
Can the required concentration really be achieved? We separate propylene chloride, trichlorosilane and silicon tetrachloride, and it is purely manual operation. It is not very convenient for us to tell you this!