The point is to extract ellagic acid, but that can be gotten by hydrolyzing the tannin.... But how can the tannin be extracted from the pomace
If I understand your question correctly, you want to extract the free ellagic acid only without hydrolyzing the tannin? - I would then suggest to use a solvent like methanol or acetonitrile. You might add some water, but this will make it difficult to get a dry extract when you rotovac the extract - unless you can freeze dry afterwards.
As long as you do not add any acids you won't get too much hydrolyzation during the extraction. To purify the extract a short column chromatography could be advisable.
You can do cold extraction using 80 to 100% acetone. Then try to do size exclusion chromatography with different solvent gradient (mixture of acetone and water). Use LH-20 sephadex as stationary phase. You will definitely get your desired tannin fraction. You will get larger fraction containing multiple tannins. Then freeze dry the fraction. After that you can do semipreparative or preparative HPLC depending on your sample amount to isolate each tannin.
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