Patent For Method for Removing Gel from Polyvinylpyrrolidone Solution

On 28^th,March. 2023, We got the Patent For Method for removing gel from polyvinylpyrrolidone solution, patent number: CN116333198.

The invention discloses a method for removing gel from polyvinylpyrrolidone (PVP) solution. Firstly prepare a PVP coarse product into a 2% (wt) -15% (wt) solution, then adding a certain amount of lignin adsorbent into the solution under the condition of maintaining the temperature to be 20-70 ℃, and enabling the adsorbent to be fully contacted with gel in PVP solution for a period of time under rapid stirring. After the operation is finished, filtering, taking filtrate, and drying to remove most of gel, thus obtaining qualified PVP products. The removing equipment used by the invention is simple, the operation is convenient, the cost is low, the effect is good, and the content of residual gel can be reduced to below 50 ppm.