journal of the college of basic education
الخلاصة. use acid Parra toluene sulfunic as cross in Foundry General Company of Nasr was of making this research which revitalize Parra toluene sulfunic acid ended authority was working to activate it in a simple and economically viable which is used (method evaporation) and even quiet warmly to get effective acids and can be blended with furans and certain proportions of sand used in ...