【Q&A Question 078】2016.07.07
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【Q&A Question 078】July 07, 2016: What is the function of a stripping tower? How many types of stripping are there? The answer key will be available after responding; scoring is based on addressing the key points. In the stripping tower, the oil in question can have its low-boiling-point components removed from the side-stream distillates through direct superheated steam stripping and indirect heating, thereby ensuring that the flash point and boiling range of the distillates meet the required quality standards. There are two types of stripping methods: (1) Superheated steam stripping: This involves using superheated steam with a temperature higher than that of the oil to carry out the stripping process. The amount of stripping steam used is 2–4% of the oil volume. ⑵Reboiler stripping: This involves using side-stream oil with a temperature higher than that of the oil product to carry out indirect stripping through a reboiler. Used for oils that are not suitable for steam stripping, such as aviation kerosene.
【Simple distillation】 For volatile substances that are miscible with water, this method takes advantage of the fact that, under gas-liquid equilibrium conditions, their concentration in the gas phase is higher than that in the liquid phase. It is directly heated by steam, causing it to become enriched in the gas phase in a certain proportion at its boiling point (a temperature between the boiling points of water and the volatiles). 【Steam distillation】For volatile pollutants that are immiscible or practically insoluble in water. By taking advantage of the fact that the boiling point of the mixture is lower than that of its components, high-boiling volatile substances can be separated and removed at lower temperatures.
This post was last edited by wangld on 2016-7-7 08:01: The light components in the stripping feed. Superheated steam stripping ； Reboiler stripping.
The low-boiling components in the liquid phase can be removed using a reboiler and steam
Stripping is a physical process that uses a gas medium to disrupt the original gas-liquid equilibrium and establish a new one, allowing a certain component in the solution to be desorbed due to the decrease in partial pressure, thereby achieving the separation of substances. Stirred tanks are now mainly tower-type and orifice plate-type
1. Reduce consumption； 2. Improve resin quality ； 3. Reduce environmental pollution. Two types: kettle stripping and column stripping
A stripping tower is a device that uses gas passing through a liquid to carry away the components desired to be removed from the liquid. Stirred tank stripping is mainly divided into two types: batch stirred tank stripping and column stripping
Stirring stripping is mainly divided into batch stirring stripping and column stirring stripping; currently, the column stirring stripping process is the most commonly used. Column stirring stripping is further categorized as follows: 1. Shin-Etsu’s stirring stripping technology, which uses a column with large-aperture, non-overflowing sieve trays； 2. American Goodrich stripping technology, tower type: sieve plate tower with an overflow weir ； 3. Japan’s Gion stripping technology combines the advantages of American Goodrich and Japanese Shin-Etsu stripping technologies; it utilizes both Goodrich’s slurry heat exchanger technology and Shin-Etsu’s negative pressure operation technique for stripping towers, and features a unique tower plate structure with small plate spacing. The main purpose of stripping is: 1. to reduce consumption ； 2. Improve resin quality ； 3. Reduce environmental pollution.
The useful components are extracted through stripping, but the method is not very clear
Strip hydrogen sulfide to reduce the corrosiveness of oils