You obviously have very little clue what you are doing, move out of your parent's house before you start abusing your ADD meds...
1. Break the patches apart (blender etc)
2. Extract into water (if you are drinking it) or 99% isopropanol (if you want a "powder") - don't bother with 70%
3. Seperate the solids from the liquids with a filter. Discard the patch solids
4. If using isopropanol, evaporate the mess and scrape up the fine white crust left behind, otherwise portion it out. Don't attempt to boil off the water because it will trash the methylphenidate. Don't drink isopropanol.
5. enjoy
I have identified a much easier and simpler process, instructions below.
Required items
1. Flat Pyrex dish with lid
2. 5 to 10 methylphenidate patches
3. Rubbing alcohol
4. Cloth
5. 2 oz hot water: hot but cool enough so it does not burn skin or boil
Preparation
1. Remove ink from patches: Using a corner of a cloth and rubbing alcohol clean the top surface of the patches of dirt and writing until no more text is visible; repeat for every patch
2. Pour 1oz hot water into Pyrex dish
3. Carefully remove patch backings and lay skin side down into the water; repeat until all patches are submerged
4. Pour the remaining 1 oz hot water over the top of the patches and slide them around to ensure they're not sticking to the Pyrex; when done correctly they will appear as if they're floating on top of the thin layer of water between the Pyrex dish and the patches
5. Place lid on Pyrex dish and allow to sit for a couple hours
6. After a few hours or after cools, open lid and you should start to see crystallization; at this point you may use a hair dryer to evaporate the remaining water or you can leave the lid off with a cheesecloth over top to allow it to evaporate naturally
7. Once all the water has been evaporated you will be left behind with a white powder and crystalline substance which is your semi-pure methylphenidate.
8.You may also collect the liquid and drink it as a shot