Formal:
* "The company tried to disassociate itself from the scandal by issuing a public apology." (meaning: the company wanted to separate itself from the scandal)
* "He attempted to disassociate his personal views from his professional opinions." (meaning: he wanted to separate his personal beliefs from his work)
Informal:
* "After the argument, she tried to disassociate herself from the whole situation." (meaning: she wanted to distance herself from the issue)
* "I can't disassociate the song from that embarrassing moment." (meaning: he can't separate the song from the bad memory)
More specific:
* "The researcher disassociated the drug's effectiveness from the placebo effect." (meaning: the researcher separated the real effects of the drug from the placebo)
Remember: "Disassociate" is often used in the context of separating yourself or something from another thing.