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Petrochemical /

Courtesy of Kashima Aromatics Co., Ltd.

C4 / C5 Fractions and Its Derivatives

Using naphtha as a raw material, an ethylene plant produces highly reactive materials in C4 (BB) fractions or C5 fractions as by-products. Butadiene in the C4 fractions and isoprene in the C5 fractions in particular, are useful chemicals as they are used to produce synthetic rubber such as tires for cars.

[ C4 / C5 Fractions and Its Derivatives ]

Key projects

About 50% of C4 (BB) fractions produced from thermal decomposition of naphtha is butadiene, which is generally separated using a special distillation technique called extractive distillation. We have constructed a lot of plants that employ processes that use such solvents as normal methyl pyroridon (NMP) or dimethyl formaldehyde (DMF). In the latter half of the 1990s, we constructed a large MTBE plant with an annual production of more than 500,000 tons in the Middle East.