Process for oxidative conversion of methane to ethylene

US11148985B2 · kind B2 · utility

Assignee

• SABIC GLOBAL TECHNOLOGIES B.V. · NL

Inventors

• Aghaddin MAMEDOV · Sugar Land, US
• David West · Sugar Land, US
• Vidya Sagar Reddy SARSANI · Sugar Land, US
• Wugeng Liang · Sugar Land, US

Key dates

• Filing date: Jan 29, 2018
• Grant date: Oct 19, 2021
• Expiry date: Jan 31, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C2523/44
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for producing ethylene and syngas comprising reacting, via OCM, first reactant mixture (CH4&O2) in first reaction zone comprising OCM catalyst to produce first product mixture comprising ethylene, ethane, hydrogen, CO2, CO, and unreacted methane; introducing second reactant mixture comprising first product mixture to second reaction zone excluding catalyst to produce second product mixture comprising ethylene, ethane, hydrogen, CO, CO2, and unreacted methane, wherein a common reactor comprises both the first and second reaction zones, wherein ethane of second reactant mixture undergoes cracking to ethylene, wherein CO2 of second reactant mixture undergoes hydrogenation to CO, and wherein an amount of ethylene in the second product mixture is greater than in the first product mixture; recovering methane stream, ethane stream, CO2 stream, ethylene stream, and syngas stream (CO&H2) from the second product mixture; and recycling the ethane stream and the carbon dioxide stream to second reaction zone.