	US 11,926,540 B2
	Cycle water treatment process for ethlyene epoxidation
Saurabh Katiyar, Little Ferry, NJ (US); Saurabh H. Parikh, Little Ferry, NJ (US); and Jason P. Durand, Wyckoff, NJ (US)
Assigned to Scientific Design Company, Inc., Little Ferry, NJ (US)
Filed by Scientific Design Company, Inc., Little Ferry, NJ (US)
Filed on Mar. 4, 2022, as Appl. No. 17/686,556.
Claims priority of provisional application 63/157,238, filed on Mar. 5, 2021.
Prior Publication US 2022/0281757 A1, Sep. 8, 2022
Int. Cl. C02F 1/42 (2023.01); C02F 101/34 (2006.01); C02F 103/36 (2006.01); C07D 303/04 (2006.01)

CPC C02F 1/42 (2013.01) [C07D 303/04 (2013.01); C02F 2001/422 (2013.01); C02F 2101/34 (2013.01); C02F 2103/36 (2013.01)]

11 Claims

1. A method for removing impurities from an ethylene oxide manufacturing plant, the method comprising:

providing an aqueous bleed stream comprising 0.2 to 20 wt % ethylene glycol and having a first UV 220 nm transmittance; and

introducing the aqueous bleed stream to a cycle water treatment unit containing an anion exchange resin to reduce the content of impurities in the aqueous bleed stream, wherein the aqueous bleed stream at an outlet of the cycle water treatment unit has a second UV 220 nm transmittance and the second UV 220 nm transmittance is higher than the first UV 220 nm transmittance, wherein the anion exchange resin is a strong base anion exchange resin having a minimum total exchange capacity of 1 milliequivalent/ml of resin and a 95% particle size distribution in the range of 0.3 to 1.2 mm.