I thought the butane is purged and the final product is thc? not butane. The trick is to find the most pure butane you can find, because its the impurities that are poisonous and can sicken or kill people. triple or quadruple distilled butane works best. Also use steel or glass tube, because butane will release vapor from pvc, brass and other materials. You can buy the kit online, its called a honey oil extractor. you don't have to try my advice, but at least now you are not ignorant...i doubt you need that much to make 12 cookies. when i make cookies the recipe calls for 2 sticks of butter and it makes a tons of cookies. i would think a 1/4lb would be more than enough tbh.
Screw butane imo. I like to get high off thc not gas fumes.