A device for selectively removing contaminants from a crude product mixture which includes a production reactor for producing a crude oil product mixture, the production reactor includes a lipid reservoir and an alcohol reservoir and a first organic acid removal reactor in fluid communication with the production reactor. The first organic acid removal reactor includes a first housing defining an interior volume the housing configured to receive the crude oil products and disposed within the interior volume of the removal reactor housing is metal oxide media selected from the group consisting of zirconia, alumina, hafnia and titania for removing organic acidic contaminants from the crude oil product to product a purified biodiesel fuel.