What job can one get if he had done phd in chemical engineering and how much salary he would have?

PhD makes the person overqualified and overexpensive to hire on the jobs that a graduate or masters chemical engineer can do. PhD makes you specialized in research and reduces the available job opportunities. PhD candidate is mostly older than MS and BS engineers in terms of age. To get job of faculty, post-doctoral research work with very high number of publications, proposal writing, securing funds and conference presentations is needed but very few join academics and those appointments are tenure-track basis.

Profit-making companies do research at secondary priority  as production of a product having market is their primary priority, they can get the work done without hiring PhD. Even faculty do research at secondary priority as teaching is their primary priority. 

If he had a good job he might get up to about several dollars an hour. If not he might get laid off so he could flip Hamburgers @ McDon's.

Most PhDs get a job in a university, a research lab or government.  I had a PhD ChE as my boss at a plant for a while, I think he wanted to make some money.  But he was like a fish out of water and left after a year or so.  And the salary will be highly dependent on experience and needs of the job. 

Depends who you are working for, where in the world and years of experience.

https://www1.salary.com/Salaries-for-chemical-engi...

Play away with that site.