A "large portion" is an exaggeration, and I don't know that any have been "refuted". Some of the studies around "priming" (Chapter 4 of the book) have been called into question for failure of being replicated, and Kahnemann himself has since said that the published studies on priming may not be replicable. Since the publication of the book we've had a "replication crisis" in the relevant literature, so the book may not be on as solid ground as Kahnemann believed when he wrote it, but it's still a very good book with important insights.
