Yes, PURIFICATION is a Scrabble word!

Letter values in Scrabble US: P 3, U 1, R 1, I 1, F 4, I 1, C 3, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

PURIFICATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the act of cleaning by getting rid of impurities
the process of removing impurities (as from oil or metals or sugar etc.)
a ceremonial cleansing from defilement or uncleanness by the performance of appropriate rites
the act of purging of sin or guilt; moral or spiritual cleansing