Break down hemoglobin into heme
I believe the chemical you are talking about that can break down the red blood cells/hemoglobin into heme and globins is carboxymethyl cellulose (CMC; see Ref). There is a US patent claiming a method for separating blood hemoglobin into heme and globin from blood cells. The abstract states that:


  The invention relates to a method of dividing blood hemoglobin into heme and globin by suspending blood cells, separated from blood, in an acid aqueous solution, by precipitating the heme by means of carboxymethyl cellulose, and by separating the precipitated heme-CMC complex out from the aqueous solution of globin. 


Title of the patent: Method for dividing blood hemoglobin into heme and globin

Patent: Karin Autio, Martti Kiesvaara, and Yrjö Malkki, US Patent 4,518,525, 1985 (11 pages)