How much do the technical magazines(specially "chemical engineering"
and "Chemical engineering progress")pay for an article that I write
for them?(per page? per word?)And when they pay?(Immidiate after
acceptance or after publishing)
I am not famous engineer and also English is my second language, so
article need edition.
Thank you

Fees and when payment is made depends entirely upon the individual
publication. Your best bet is to either find the websites of magazines
you're interested in writing for and finding their "writer's
guidelines" page, or write to them, requesting their submission
guidelines; if you do the latter, you should include a self-address,
stamped envelope for their reply.

Good luck!
Kriswrite