Why some customers find the water content of 2-Pyrrolidone in winter is much higher than in summer?
Some of our customers told Trendchem that, in their testing, the water content in 2-Pyrrolidone is much higher than the standard, even 10 times difference.
Is there anything wrong? The answer is NO! But what’s the problem?
After the study, we revealed the truth of such problem. Here is the explanation:
When it’s below 25℃, the 2-pyrrolidone become crystalline, the customer need to heat and melt 2-pyrrolidone to run a test, but the customer did not heat 2-pyrrolidone thoroughly, there are still some 2-pyrrolidone remain crystallization, and the water in a product is not frozen (higher than 0℃), so 100% water is always in the solution, and but the 2-pyrrolidone is not 100% in solution.
For example, if the temperature is above 25℃, the water in a drum is 0.1kg, 2-Pyrrolidone is 200kg, the real water content is 0.1/200*100%=0.05%, and if 2-Pyrrolidone only melt 50kg in the heating process, the test result will become 0.1/50*100%=0.2%. If the amount of melted 2-Pyrrolidone is less than 50kg, the final water content is likely to reach 0.65% or even higher.
So in winter, you need to heat the 2-pyrrolidone thoroughly, and turn it into 100% liquid before running a test.