Benzoyl peroxide isolation from acne treatment cream Akneroxid 10 In the end of video I said that it can be used as photoinitiator for radical polymerisation. This is not very common use and BP itself can not be used for this purpose, but it can be dye sensitized. One paper stated, that Rhodamine 6G will sensitize decomposition of BP. It can still be used as thermal initiator however. In this video we will isolate benzoyl peroxide from acne treatment akneroxid 10 cream. Product contains carbomer 940, which is polyvinyl polymer insoluble in acetone and in basic solutions. It is used as geling agent. Next we have lauromakrogol 200, that is esentialy polyethylene glycol, which is soluble in water. Ethylenediaminetetraacetic acid or EDTA is soluble in water. Sodium hyrdoxide is used as stabilizer. Product contains water, that increases polarity of our solvents so we have to use a lot to dissolve benzoyl peroxide. We start by adding 150ml of acetone into disposable plastic cup to dissolve BP from product. Next add contents of the cream to the acetone Stir the solution and try to break the cream into smaller chunks. Acetone solution turns white due to water content. You can see crystals of BP possibly contaminated with EDTA on the stir rod. Then we filter the solution through cotton pads as coffee filter was clogged wery quickly. in the filter you can see chunk of carbomer turned into a latex like blob along with som crystaline powder which is benzoyl peroxide that perticipated out. we wash this with acetone until all crystals dissolve. We are left with 250ml of filtrate. This is big waste of solvent so pre drying cream may be a good option. We add water to our filtrate to perticipate BP out of the solution. Meh more water. Actualy in the end of process we added about 3 liters of water. that was kinda overkill, but about 1 liter was really necessary to achieve a good yield. Here you can see the perticipate. and after some cooling Now we filter the perticipate. The water you see after filtration was actualy lot cleaner as it looks. Beaker and contents left in filter was washed with about 100ml of water You can see that we are left with white fluffy powder. Powder was dryed as much as possible, but not completely and transfered to petri's dish. Still fairly wet product was weighted and I guess there are about 4 grams of benzoyl peroxide which is 80% yield based on starting material. That is very good. However that is only a guess. To test our product we can test explosive thermal decomposition. Product was heated indirectly with propane torch. when suddenly small explosions occur. Not very big thou Benzoyl peroxide can be used as polymerization photoinitiator. Upon iradiation decomposes to benzoic acid and oxygen Store the product wet or ... https://www.youtube.com/watch?v=suKrbe7CEnE

I don't know how they do it industrially, but this is small scale viable. In last section I used arcing to atomize tin. This method can produce very small particles ... https://www.youtube.com/watch?v=gUGrbglHEig