What is the pressure of the rich amine liquid coming out of the absorption tower in the flash tank?
Thread Content
When simulating the amine scrubbing desulfurization process, what pressure should be set for the rich amine liquid coming out of the absorption tower and entering the flash tank? The pressure in the absorption tower is set at 7 kg/cm2. What should be the actual pressure in the flash tank in practical applications? Thank you
It is generally between 0.5-0.6 MPa
Let me ask a question: Why does the rich amine liquid coming out of the absorption tower go into the flash tank? Why the flash tank? Isn’t it going into the regeneration tower?
Generally, it goes into the regeneration tower. The operating pressure is required to ensure that the desorbed gas can return to the previous system for further reaction, and it is also necessary to achieve thorough desorption; since the solution is to be reused, simply adding more steam will suffice.
May I ask the original poster, are you using ammonia to absorb sulfur dioxide?
Dehydrogenation in an advanced flash tank, followed by entry into a regeneration tower.
The pressure is generally maintained at around 0.25 MPa
The rich liquid coming out of the exhaust gas absorption tower in the sulfur plant generally does not need to go into the flash tank, as it contains no hydrocarbons. Generally, for upstream units such as LPG desulfurization or dry gas desulfurization, the rich liquid needs to be flashed, and the operating pressure of the flash tank varies depending on the specific situation.
I am involved in the desulfurization of natural gas using the amine scrubbing method; the material goes into the flash tank mainly to have the hydrocarbons flashed off
Oh, when asking questions, it’s necessary to specify the operating conditions in detail. The pressure in the flash tanks for natural gas desulfurization differs from that in the flash tanks used for refinery gas desulfurization. As for the flash pressure in the purification of natural gas, at the Wolonghe Natural Gas Processing Plant, it is 6 kg/cm2 (gauge pressure) (see “Refining Design”, issue No. 4 of 1982, “Introduction to the Wolonghe Natural Gas Purification Plant”). The flash pressures in other foreign plants are discussed in “Chemical Industry Insights”, issue No. 11 of 1997, in the article titled “Pre-treatment Techniques to Reduce Hydrocarbon Content in Raw Materials Used for Sulfur Production from Refinery Gas”, authored by Li Zhengxi. If you need this information, please let me know your email address and I’ll send it to you.
The pressure in the flash tank does not need to be very high; 0.2 MPa is sufficient. Once the hydrocarbons are removed, they go to the regeneration tower for regeneration