Process for producing dienes

US11851385B2 · kind B2 · utility

Assignee

• Versalis S.P.A. · IT

Inventors

• Talisa Cerasoli · Novara, IT
• Stefano Ramello · Novara, IT
• Monica Vittoria Pastori · Castelletto di Cuggiono, IT

Key dates

• Filing date: Dec 18, 2020
• Grant date: Dec 26, 2023
• Expiry date: Dec 18, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2521/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for producing a diene, preferably a conjugated diene, more preferably 1,3-butadiene, includes the steps of dehydrating at least one alkenol in the presence of at least one catalytic material having at least one acid catalyst based on silica (SiO2) and alumina (Al2O3), preferably a silica-alumina (SiO2—Al2O3), the catalyst having an alumina content (Al2O3) lower than or equal to 12% by weight, preferably between 0.1% by weight and 10% by weight, with respect to the catalyst total weight. The alumina content is referred to the catalyst total weight without binder, and a pore modal diameter between 9 nm and 170 nm, preferably between 10 nm and 150 nm, still more preferably between 12 nm and 120 nm.Preferably, the alkenol is obtainable directly from biosynthetic processes, or catalytic dehydration processes of at least one diol, preferably a butanediol, more preferably 1,3-butanediol, still more preferably bio-1,3-butanediol, deriving from biosynthetic processes.