If you'd like to separate your business accounts, we'd first recommend changing the email address from your business one to your personal one.
After you've done that, you'll be free to use the same business email address when moving the business to a new account.
To separate your business account from the current login details, all you need to do is:
Log into your business account
Go to Manage on the left-hand panel
Go on Team under Business tools
Choose Add team members at the top
Accept the invite from the email invitation and set up the new account
Go back to your current business account, then Team again
Click on your name, then Change owner
Choose the Admin to be the new Owner and confirm the change
Once you’ve followed those steps, your business account has been moved to separate login details from your current account.