The Comonomer Production Technology (CPT) can make comonomer-grade butene-1 and hexene-1 from steam cracker C₄s. Using isomerization and metathesis chemistry, CPT can produce these highly valued products from lower-valued C₄s rather than from polymer-grade ethylene. Ethylene and propylene are co-produced.

In situations where there are no C₄s sources, as with an ethane cracker, utilizing Lummus' Ethylene Dimerization Technology to produce butene-2 for feed to a CPT unit also allows for comonomer-grade butene-1 and hexene-1 production.