I think, you are talking about regenerator of Gas sweetning unit. There are ways to transfer vapors from regenerator depending on your downstream system.
In of the project I worked, we had low pressure vapor, generated from regenerator of TEG units, to be sent to acid gas compressor suction. The pressure levels were similar to yours. We employed ejector in that. However, you need a motive fluid for the ejector. We have used small portion of high pressure dry gas as motive fluid for ejectors. In your case, you should evaluate whether you have motive fluid with sufficient pressure and is it worth using it coz, motive fluid will be lost in acid gases.
Consider using, liquid ring compressor also. They are widely used these days in vapor recovery system e.g. for regenerator overhead vapors in TEG units, flashed vapors from low pressure storage tanks, etc.
Also, i am not sure, which technology you are using, but consider increasing the regenerator pressure if you can. For TEG units, you are bound to operate at low pressure but for certain GSU units, you can go with higher pressure regenerators.
Good luck.
Edited by Jiten_process, 20 September 2020 - 06:33 AM.