Precautions When Dissolving Polyacrylamide

Polyacrylamide(PAM), as a widely used polymer compound, plays a crucial role in various fields such as water treatment, papermaking, and oil extraction. However, to fully utilize its superior performance, proper dissolution procedures are of utmost importance. This article will detail the key operations that need attention during the dissolution process of PAM, from preparation before dissolution to post-dissolution handling, as well as necessary safety precautions, aiming to help readers better master the dissolution techniques of polyacrylamide and ensure its optimal effectiveness in practical applications.

Polyacrylamide Dissolution Process:

Concentration Control: The dissolution concentration of polyacrylamide should be controlled within a certain range, generally recommended to be between 0.1% and 0.3% (or 0.05% to 0.5%), with some suggesting that 13‰ is ideal. Too low a concentration may not effectively function, while too high a concentration could lead to inadequate molecular chain extension or the formation of gelatinous substances, reducing effectiveness.

Water Temperature Control: The water temperature should be controlled between 50°C and 60°C, which is the most suitable temperature range for dissolution. Avoid using water temperatures above 60°C to prevent thermal degradation of polyacrylamide. Meanwhile, room temperature dissolution is also acceptable but ensure the water temperature does not get too high.

Stirring Speed: The stirring speed should be moderate, neither too fast nor too slow. Excessively fast stirring might break the molecular chains of polyacrylamide, diminishing its effectiveness; whereas too slow stirring could cause the polymer particles to sink and clump together in the water. Generally, it is suggested to control the stirring speed at 60 revolutions per minute or 100~300 revolutions per minute, depending on the type of stirrer.

Feeding Method: When adding PAM dry powder, it should be slowly sprinkled into the water rather than poured to avoid forming difficult-to-dissolve lumps. At the same time, water should be added while adding the dry powder until the dissolution tank is full.

Post-Dissolution Precautions for Polyacrylamide:

Dissolution Time: Anionic and cationic polyacrylamides require stirring for 30 to 60 minutes, while non-ionic polyacrylamides need 50 to 90 minutes. Ensure thorough and uniform dissolution.

Storage Time: The treated solution should be used promptly to avoid prolonged standing. Cationic PAM solutions should not be stored for more than one day, and anionic polyacrylamide solutions should not exceed two days to prevent degradation.

Avoid Mixing with Other Ions: Do not mix other ions such as cations or anions during the dissolution process to avoid affecting the chemical reaction and dissolution effect of PAM.

Personal Protection: When handling polyacrylamide, wear protective goggles and gloves to avoid contact with skin and eyes.

Operational Environment: Ensure good ventilation in the operation environment to avoid prolonged inhalation of polyacrylamide dust or vapor.

In summary, several aspects of operation and control need attention when dissolving polyacrylamide to ensure its dissolution effect and performance. By following the above precautions, the effectiveness of PAM can be maximized.