Solvay Process Engineer interview questions

I don't remember specific questions, but I was basically meeting all the main people I would be working with in individual interviews (5 different people, 1-2 hour interview or meal each). I clicked with everyone, so the questions really just felt like casual conversation. Other people I spoke to about their interviews said that this was one of their hardest, most intense interviews since you are being scrutinized by different people literally all day.