Table 1.

Composition of C₄ streams obtained from FCC, MTO, and steam cracking.2, 5

Compound	Mass fraction [%]
	FCC	MTO	steam cracking
isobutane	35–45	0.2	0–2
n‐butane	7–42	4	2–5
isobutene	10–20	2–4	18–32
1‐butene	9–12	20–26	14–22
2‐butene	20–29.5	65–70	5–15
butadiene	0–0.5	–	35–50