Hello, I've tried to synthesize CNC from MCC but in hydrolysis process it's get dark at the end. What is the problem and it's reason?

I used 7 g MCC in 100 ml of 65% sulfuric acid. Temperature and hydrolysis time were 40 C and 2 h respectively. After 10 min it's became yellow and at the end it was dark brown.

10 November 2021 5,928 8 View