As far as I know, there is no way to export a batch of RAW files to another folder in LR. The Export function usually converts to other formats, such as JPG, TIFF, etc.
Here is a workaround I found for us Windows users that are tired of clicking “Open in Explorer” and then dragging the file from there to PureRaw:
Go to Open Directly - open files directly into 3rd party app and download the plugin. Follow the instructions for installing into LR. The plugin is a bit pricey, but it supports using one app as nagware.
In LR, go to File/Plug-in Extras in the menu and choose “Open directly”. Click OK on the “trial version” message and you will get to the config screen for the plugin. In row 1, add “C:\Program Files\DxO\DxO PureRAW\PureRawv1.exe” and click OK.
Select the photos you want to process with PureRaw and select “File/Plug-in Extras/Quick” (under the Open Directly section.) The images you selected will then be opened in PureRaw, ready for processing.
Once the images are processed, I haven’t had much luck with the “Export to Lightroom Classic” option in PureRaw. What I do instead, is go back to LR and right-click on the folder they came from and select “Synchronize Folder”. Since the PureRaw images are in a “DxO” subdirectory, the synchronize finds them and imports them. A cool feature of this workflow is that my edits to the original RAW file get included in the PureRaw DNG (except the noise reduction and sharpness edits, of course!)
I am hoping that DxO will write a plug-in that can do what “Open Directly” does. I don’t use PhotoLab, but it appears that it has such a plug-in (see step 2 in Workflow DxO Photolab & Adobe Lightroom - DxO ).