As I said last time, the burping was from leftover water. And the water was there because of
the “scientific” low temperature you used. You need to decarboxylate the oil anyway, so a rice
cooker that will shut off at 110°C works just fine. Or, of course, the best thing to use would be a
still - but again, many people don´t own them and don´t how to operate them, and the risk of an
explosion is always present. When a still explodes, it will usually demolish the whole house. When
the contents of a rice cooker explode, it will only make a two or three meter high flame that is
quite easy to deal with.