Seeking advice on the feed temperature of a distillation tower
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For a multi-component gas-liquid two-phase feed, how should the feed temperature be determined? Please advise.
Gas-liquid mixed feed; the feed temperature should be between the bubble point and the dew point
It’s better to have separate feed inlets
I know it lies between the bubble point temperature and the dew point temperature, but how is this temperature value determined?
The temperature of the feed entering our tower is primarily controlled by a feed preheater located ahead of it. In my opinion, the temperature and composition of the feed should be similar to those of the material on the plate from which the feed enters the tower; this allows for adjustment of the preheater temperature. In industry, saturated liquid is generally used as the feed. Changes in the feed state affect the number of plates in the distillation and stripping sections, which in turn impacts the quality of the product.
It is generally designed according to needs; for ordinary applications, bubble-point refined materials are used, along with considerations regarding cost.
The feed temperature should ideally match the temperature of the corresponding feed plate. The feed temperature affects the load on the reboiler at the bottom of the tower, as well as the load on the distillation section. The specific set temperature should be determined based on actual requirements; when the loading in the distillation section due to bubble-point feeding is too high, a vapor-liquid mixed feed is often used in the design
In general industry, bubble-point feeding is adopted; changes in the feeding condition affect the number of trays in the distillation section and the stripping section, thereby impacting product quality.
Thank you to the original poster for their generosity; I’ve learned a lot
If the distillation tower is modified to have two feed inlets for gas and liquid, are there any constraints regarding their positions?
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