What u have done seems to be somehow a pulping process.
Of course, u have end with a very messy thing.
I do not clearly understand the meaning of extraction with diethylether.
I think it will be better to centrifuge the aqueous mixture and then to perform Soxhlet extraction upon solid mater and percolation upon supernatant.
and then simply rotoevap organic solvent and do what u want with end products.
Once again...what do u have in mind to obtain? I kindly ask this question because I was involved some time again in pulp and paper science...
regards