Questions regarding the alkylation refrigeration section
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I’m just starting to learn about *alkylation, and my questions might be quite basic; please forgive me. In the description of the sulfuric acid-based alkylation refrigeration process, there are several sentences that state: \"The refrigerant coming out of the compressor is condensed, and the condensate is collected in the intermediate refrigerant tank.\" The refrigerant condensate coming out of the refrigerant intermediate tank is cooled before entering the energy-saving tank; the flash vapor in this tank goes to the intermediate section of the compressor, while the liquid enters the flash tank. Question 1: What is the function of the intermediate tank? Is it equivalent to a buffer tank for collecting condensate? Question 2: It has already been cooled before the intermediate tank; why is cooling necessary again before entering the energy-saving tank? Question 3: Why is the energy-saving tank energy-efficient? Does the flash vapor in the energy-saving tank save energy when it enters the intermediate section of the compressor? So is there also a pressure requirement for this flash steam? I hope experts in alkylation can help answer this
This post was last edited by Benpeng Guo Jibo45 on 2017-9-7 at 21:00. 1. It can be regarded as a buffer tank, and it can also adjust the compressor outlet pressure by regulating the temperature after cooling. 2. Further cooling ensures that the components that can be liquefied do so completely, thereby achieving a better cooling effect. 3. No need for compression, resulting in energy savings. The flash tank is maintained at a slight positive pressure.
It’s okay; let’s communicate more. There are many people on the forum who work in alkylation, so I think more answers will emerge over time.
The answer above is very comprehensive. 1. The first one is the refrigerant buffer tank, which is used as a storage tank.
The answer above is already very comprehensive. 1. You’re correct about the first one; it’s the refrigerant buffer tank, used to collect condensate. 2. It is to further reduce the temperature of the condensate by removing heat from the system; in fact, all the heat in the entire refrigeration system is removed through these heat exchangers. 3. The purpose of the energy-saving tank and the flash tank is to increase the amount of refrigerant that vaporizes, thereby reducing the temperature of the refrigerant more effectively. This is achieved by allowing some of the liquid in the refrigerant to vaporize under a slight positive pressure of around 20 KPa; the heat absorbed during this vaporization process helps to lower the temperature of the unvaporized material.