He is a God or Demon in a human body

I'm looking for the novel of a Demon God who is killed but is reincarnated as a young man called Jacob.  Yet he still retains some of his magic and all of his abilities and memories of his former life...
He is married to a woman who is struggling to keep her father's company afloat with a chemistry formula for her perfume and has invited a Nobel prize winner Chemist, however Jacob changes the formula and now the Noel Prize winner wants to be Jacob's student.