Learn Spanish (Latin America): Yo destilo que destilo la esencia de jazmín. - I distill and distill the jasmine essence.

This is a common colloquial pattern: a conjugated verb + que + the exact same conjugated verb. It emphasizes that an action is continuous, repetitive, and perhaps a bit tedious or intense. In English, we usually translate this repetition using "and" (I distill and distill) or "keep on" (I keep on distilling).

Could I just say destilo y destilo instead?

Yes, destilo y destilo is grammatically correct and means the same thing. However, using que is a very natural, idiomatic way to express this persistent repetition in Spanish. It gives the sentence a specific rhythmic emphasis that y doesn't quite capture.

Why is the pronoun yo used at the beginning if destilo already tells us who is doing the action?

While the pronoun is entirely optional, adding yo before a highly repetitive or rhythmic phrase like destilo que destilo often serves to emphasize the speaker's personal effort or exhaustion. It’s like saying, "Here I am, distilling and distilling."

I know destilar means "to distill" here, but can it be used in other contexts?

Definitely. At a B2 level, you will often see destilar used figuratively to mean "to exude" or "to give off." For example, you might read el poema destila tristeza (the poem exudes sadness) or ella destila confianza (she radiates confidence).