35 ILCS 200/21-425
If the grantee of a tax deed, or any one claiming thereunder, fails or refuses to reconvey the property to the owner or owners thereof on demand after payment or tender or deposit of the amount due as provided in Section 21-415, the owner or owners may petition the circuit court in the same proceeding in which the order for issuance of tax deed was entered, asking that the amount of the tender, if not already deposited, may be deposited with the county treasurer and that the sheriff in that county be ordered to reconvey in the name of the holder of the tax title the property to the owner or owners thereof. Notice of the filing of the petition and the date of hearing thereon shall be given as the court may direct. Upon proof that the required amount has been deposited with the county treasurer and that the petitioner has complied with all requirements of law entitling him or her to a reconveyance of the tax title, the court shall enter an order directing the sheriff to reconvey the property in the name of the holder of the tax title to the owner or owners thereof.
Whenever the tax purchaser makes application to withdraw moneys deposited with the county treasurer he or she shall deliver to the county treasurer a reconveyance of the tax title to the person or persons who made the deposit.
35 ILCS 200/21-425