Patent SG-11201811648X-A (SG)
Title: Process for obtaining graphene oxide
Inventor: TERENCE MAURO CESAR
IPC: C01B32/225
Filed: 2017-06-23
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 28 December 2017 (28.12.2017) WIP0 I PCT ill~~~~~~~~ 011101tIIl inn OilIIIIIOHOH0II111111 0IIIIII Oil (10) International Publication Number WO 2017/219111 Al (51) International Patent Classification: MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, CO1B 32/23 (2017.01) CO1B 32/225 (2017.01) TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, (21) International Application Number: KM, ML, MR, NE, SN, TD, TG). PCT/BR2017/050161 Published: (22) International Filing Date: with international search report (Art. 21(3)) 23 June 2017 (23.06.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: BR 10 2016 014996 7 24 June 2016 (24.06.2016) BR (71) Applicant: INSTITUTO PRESBITERIANO MACKENZIE [BR/BR]; da Consolacao, 896, 01302-907 Sao Paulo (BR). (72) Inventors: TERENCE, Mauro Cesar; Dr. Jose Estefno, 80 - Apto. 114 - Jardim Vila Mariana, 04116-060 Sao Paulo - SP (BR). CARRIO, Juan Alfredo Guevara; Itambe, 440 - Apto. 113 - Higienopolis, 01239-000 Sao Paulo - SP (BR). NASCIMENTO, Rodrigo Saad do; Bela Cintra, 201 - Ap- to. 52-B - Consolacao, 01415-001 Sao Paulo - SP (BR). (74) Agent: ARNAUD, Antonio M. P.; Rua Jose Bonifacio, 93 - 9° Floor, 01003-901 Sao Paulo - Sao Paulo (BR). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, (54) Title: PROCESS FOR OBTAINING GRAPHENE OXIDE • (57) : The process comprises the following steps: mixing lamellar graphite, containing an intercalating material, with NaNO3 rl and adding the mixture to a solution of H2SO4 (98%) under continuous stirring; cooling the mixture in an ice bath; adding, very slowly, from 2% to 10% of KMnO4, during a period of time up to lh, maintaining the stirring; removing the mixture from the ice bath, heating 1-1 it and maintaining it under stirring, until the formation of graphene oxide; diluting the mixture in deionized water until the volume of the solution has increased at least 30% and the temperature has not exceeded about 60°C; leaving the mixture to stand for completing \" the reaction; heating the mixture between 95°C and 100°C and keeping it under high stirring. Adding deionized water and hydrogen • peroxide to the mixture, for completion of the oxidation reaction; purifying the mixture by washing it with a solution of HC1 and, then, 1-1 © with deionized water, for removing the acids: and filtering and drying the mixture for obtaining the graphene oxide in powder with a N conversion degree higher than 90%.