July 13 (Reuters) - Hainan HNA Infrastructure Investment Group Co Ltd
* Says it signs agreement to buy 60 percent stake in Rio De Janeiro Aeroportos S.A. for 127.0 million yuan ($18.73 million)
* Says it's in deal to sell 9 percent stake in Rio De Janeiro Aeroportos S.A. for 19.0 million yuan to Singapore's Excelente B.N.
* Says it, Excelente plan to boost capital at Rio De Janeiro Aeroportos by a combined 4.2 billion yuan
Source text in Chinese: bit.ly/2ubHnjQ
Further company coverage: ($1 = 6.7815 Chinese yuan renminbi) (Reporting by Hong Kong newsroom)