Although you could save RTF documents as CSV, it won't be really a Comma Separated Value file. Just a text file with CSV extension. You need to create CSV files from databases or spreadsheets.
Convert Rich Text Format document to Comma Separated Value.
We found one software available in the database for this conversion.
Microsoft Windows software - convert rtf to csv on Windows
An older office and productivity suite for Windows
Convert from rtf file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.