Does Illinois have a separation law before a divorce is granted?

Under current Illinois law, the court may enter a judgment of dissolution of marriage where irreconcilable differences have caused the irretrievable breakdown of the marriage and the court determines that efforts at reconciliation have failed or that future attempts at reconciliation would be impracticable and not in the best interests of the family. If the parties live separate and apart for a continuous period of not less than six months immediatley preceding the entry of the judgment dissolving the marriage, there is an irrebuttable presumption that the requirement of irreconcilable differences has been met.