November 2017

Process Optimization

Comparing DNBP replacement options in styrene production

The manufacturing of styrene commonly uses 2,4-dinitro-6-sec butylphenol (DNBP) as a retarder to protect against styrene polymer formation.

The manufacturing of styrene commonly uses 2,4-dinitro-6-sec butylphenol (DNBP) as a retarder to protect against styrene polymer formation. DNBP, also known as dinoseb, is extremely toxic. The documented risk that DNBP poses to people and to the environment has motivated regulators to take action to restrict its use. The styrene manufacturing industry has made efforts to test alternatives to DNBP. However, these tests have demonstrated that eliminating or replacing DNBP is extremely difficult. The chemical is the most commonly used retarder for protection against styrene polymerization. Other industrial uses of DNBP have been replaced with suitable substitutes. When the styrene industry is

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