Technology

Process Description

Producing EO over a catalyst is the first step in the overall EO/EG manufacturing process. In the reaction section, EO is produced by catalysed, direct partial oxidation of ethylene. Additionally, a portion of the ethylene fully oxidises to form CO2 and water. These reactions take place in an isothermal (tubular) reactor at temperatures of 230–270°C. The reaction is moderated/optimised using an organic chloride^[1]. 

EO is recovered from the reactor product gas by absorption in water. Co-produced CO2 and water are removed, and, after the addition of fresh ethylene and oxygen, the gas mixture is returned to the EO reactor as feed. The EO–water mixture can be routed to a purification section for recovery of high-purity EO and/or to a reaction section where EO and water are converted into glycols^[1].

Process Licensing

Shell has issued licenses for 89 EO/EG plants worldwide, 53 of which are still operating. Nearly 40% of the world’s EO is produced in Shell-licensed and designed plants. More than 50% of the world’s EO is made using Shell Catalysts & Technologies’ catalysts. Shell’s affiliates are also among the world’s largest ethylene oxide (EO) producers and are significant global ethylene glycol (EG) manufacturers.^[2].

References

1. Shell Catalysts & Technologies, 22^nd Mar 2021, ENHANCEMENTS IN ETHYLENE OXIDE/ETHYLENE GLYCOL MANUFACTURING TECHNOLOGY WHITE PAPER.
2. Shell, MASTER (EO/EG) Process (accessed 29th Apr 2024).