Position of ethanolamine in benzene extraction injection
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May I ask where the monoethanolamine tank of the extraction unit is located? Is heat tracing required, and how should the amount of monoethanolamine added be determined?
Monoethanolamine is generally injected into the solvent circulation loop or water circulation system; the tank can be placed in a nearby location. In northern regions, it is recommended to add insulation, and the heating should be gentle – electric heating elements for the pipes are advised. Heating is not recommended for the tank; monoethanolamine is volatile and absorbs moisture, so a nitrogen seal should be used. The injection of monoethanolamine is determined based on the pH value of the solvent or water in the system. If the pH value of the solvent or water is too low, 1–2 liters can be injected once per shift; however, this should still be determined by the process supplier, as monoethanolamine is a strong base, and excessive injection can lead to alkaline corrosion in the system.
May I ask how to control this amount of 1L per shift? We plan to use nitrogen pressure to push it into the system; the monoethanolamine tank was originally designed to be located on top of the stripping reflux tank, from where it will be injected. Now it is changed to be added to the backwash liquid from the tank outlet, returning to the extraction tower
When adding monoethanolamine, attention should be paid to the basicity of benzene in the product, to prevent catalyst poisoning and deactivation in subsequent equipment
After designing the monoethanolamine injection point after the lean solvent filter, heat tracing is required for insulation, with the PH of the lean solvent to be controlled within the range of 6-9.
I’m talking about using nitrogen for injection when there is an injection pump present In such cases, it is difficult to control the amount of injection; excessive injection can affect the operation of the extraction tower (salt deposition on the tray plates). It is recommended that your company keep proper records of the injection volume to prevent alkaline corrosion caused by excessive injection.
Hello, I have a question for you. Have you ever encountered a situation where only the pH value of the water system decreased, while the pH of the solvent remained normal?