is "Collect a promise" sentence correct?

Não tenho ideia.

you can ask someone to promise, so in that sense, you can demand a promise. Not really collect though.

You can collect on a promise, which means to get the person to do his side of the deal, do what he promised. The promise itself is not collectable, only what was in the promise.

Expect or require

you cannot collect a promise

someone promises' you something and you have to wait to be given it