Regarding the method of adding alkali in the methanol-water separation tower
Thread Content
As can be seen from the PID diagram for low-methanol washing in our plant, there is a port for adding NaOH at the bottom of Tower 5, which is used to adjust the pH value of methanol. I would like to ask those experienced in this field: how is NaOH added, when should it be added, and is it added all at once or in several doses depending on the pH value of methanol?
Is it necessary to add NaOH? I’m hearing about it for the first time. Is it considering the issue of corrosion prevention?
Here’s another connection for you to try! http://bbs.hcbbs.com/thread-380193-1-1.html
Adding alkali to T5 is mainly to prevent corrosion by acidic substances such as HCN. It can be added continuously or for a period of time when the pH value is low.
Based on the analysis results of the pH of the wastewater being discharged, NaOH can be added intermittently to maintain the pH of the wastewater between 7 and 12
Our methanol-water tower is equipped with NaOH, mainly to prevent polymer compounds from aggregating inside the tower and thus affecting its efficiency; the pH level is kept between 9 and 10. NaOH is added continuously, at a concentration of 25%. :lol :lol :lol :lol Any experts out there who can give some advice? :handshake
Generally, an alkali addition tank is provided (used for preparing alkaline solution), from which the alkali is pumped into the system; the pH value of the liquid in the tower bottom is usually controlled between 8 and 10.5. This post was last edited by Pastoral Poet on 2009-3-17 10:57]