How to convert monohydrate citric acid into anhydrous citric ?

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Oleg Nizhnik

Seems dehydration at 100C is also ok

Citation:

In all the thermal measurements the gas flows at a rate of 25 ml min-1. Materials Anhydrous citric acid (Aldrich, 99%) was kept at 100°C until constant weight was attained in order to remove any absorbed moisture.

Nouman Khan

thank your for your response...but i think this is for conversion from anhydrous to monohydrous..plz clearify...secondly, is just heating the solid monohydrous at 100 degree would be enough for this conversion?

I think the heating to 100C was used to rid of hydrate impurity in nominally anhydrous citric acid. Because citric acid is hygroscopic.