What happends to my UNB-Coins on Bittrex after they remove the coin on July 14th? Will I be able to transfer them from Bittrex to another exchange or leave them there in case the coin comes back to Bittrex?
You'll have to direct that question to Bittrex, they control all coins transferred to them (just like any other bank).
Try at:
https://bittrex.slack.com/messages/C5J5KRRBK/