Patent ID: 6255273
Filing Date: 2001-07-03
Classification: B01D,C11D,C23G

Abstract:
Azeotropic or near azeotropic compositions, based on difluoromethoxybis(difluoromethyl ether) and/or 1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether, selected from the group consisting of:composition % by weight I) difluoromethoxy 2-60 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1-dichloro-2,2,2-trifluoroethane 98-40 (CHCl.sub.2 CF.sub.3,HCFC 123 II) difluoromethoxy 1-95 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); n-pentane 99-5 III) difluoromethoxy 1-95 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); iso-pentane 99-1 IV) difluoromethoxy 1-60 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); dimethyl ketone (acetone) 99-40 V) difluoromethoxy 1-99 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1,1,3,3-pentafluorobutane 99-1 (CF.sub.3 CH.sub.2 CF.sub.2 CH.sub.3, HFC 365 mfc) VI) difluoromethoxy 1-40 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1,1,4,4,4-hexafluorobutane 99-60 (CF.sub.3 CH.sub.2 CH.sub.2 CF.sub.3, HFC 356 ffa) VII) difluoromethoxy 1-96 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); methoxymethyl methylether 99-14 VIII) difluoromethoxy 30-99 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); n-hexane 70-1 IX) difluoromethoxy 1-99 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); trans 1,2-dichloroethylene 99-1 (ClCHCHCl, tDCE) X) 1-difluoromethoxy 1-93 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF.sub.2 OCF.sub.2 CF.sub.2 OCF.sub.2 H); n-pentane 99-7 XI) 1-difluoromethoxy 30-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF.sub.2 OCF.sub.2 CF.sub.2 OCF.sub.2 H); dimethyl ketone (acetone) 70-1 XII) 1-difluoromethoxy 50-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF.sub.2 OCF.sub.2 CF.sub.2 OCF.sub.2 H); methyl alcohol 50-1 XIII) 1-difluoromethoxy 15-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF.sub.2 OCF.sub.2 CF.sub.2 OCF.sub.2 H); n-hexane 85-1 XIV) 1-difluoromethoxy 1-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF.sub.2 OCF.sub.2 CF.sub.2 OCF.sub.2 H); trans 1,2-dichloroethylene 99-1 (ClCHCHCl) XV) 1-difluoromethoxy 5-99 1,1,2,2-tetrafluoroethyl difluoromethyl ether (HCF.sub.2 OCF.sub.2 CF.sub.2 OCF.sub.2 H); ethyl alcohol 95-1 XVI) difluoromethoxy- 1-42 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1-dichloro-2,2,2-trifluoroethane 98-24 (CHCl.sub.2 CF.sub.3, HCFC 123) hydrocarbon 1-35 XVII) difluoromethoxy- 1-64 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1,1,3,3-pentafluorobutane 98-1 (CF.sub.3 CH.sub.2 CF.sub.2 CH.sub.3, HFC 365 mfc) hydrocarbon 1-35 XVIII) difluoromethoxy- 1-22 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1,1,4,4,4-hexafluorobutane 98-43 (Cf.sub.3 CH.sub.2 CH.sub.2 CF.sub.3, HFC 356 ffa) hydrocarbon 1-35 XIX) difluoromethoxy- 1-55 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1-dichloro-2,2,2-trifluoroethane 98-35 (CHCl.sub.2 CF.sub.3, HCFC 123) alcohol 1-10 XX) difluoromethoxy- 1-89 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1,1,3,3-pentafluorobutane 98-1 (CF.sub.3 CH.sub.2 CF.sub.2 CH.sub.3, HFC 365 mfc) alcohol 1-10; and XXI) difluoromethoxy- 1-35 bis(difluoromethyl ether) (HCF.sub.2 OCF.sub.2 OCF.sub.2 H); 1,1,1,4,4,4-hexafluorobutane 98-55 (Cf.sub.3 CH.sub.2 CH.sub.2 CF.sub.3, HFC 356 ffa) alcohol 1-10.