	US 11,905,177 B2
	Storage medium and method for separating, storing and transporting chlorine from chlorine-containing gases
Maxime Paven, Langenfeld (DE); Yuliya Schiesser, Troisdorf (DE); Rainer Weber, Odenthal (DE); Gerhard Langstein, Kürten (DE); Vinh Trieu, Cologne (DE); Sebastian Hasenstab-Riedel, Kleinmachnow (DE); Nico Schwarze, Bielefeld (DE); and Simon Steinhauer, Berlin (DE)
Assigned to COVESTRO INTELLECTUAL PROPERTY GMBH & CO. KG, Leverkusen (DE)
Appl. No. 17/054,149
Filed by COVESTRO INTELLECTUAL PROPERTY GMBH & CO. KG, Leverkusen (DE)
PCT Filed May 3, 2019, PCT No. PCT/EP2019/061392 § 371(c)(1), (2) Date Nov. 9, 2020, PCT Pub. No. WO2019/215037, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 18170956.9 (EP), filed on May 7, 2018; and application No. 18213282.9 (EP), filed on Dec. 18, 2018.
Prior Publication US 2021/0087057 A1, Mar. 25, 2021
Int. Cl. B01D 53/22 (2006.01); C01B 7/07 (2006.01); B01D 53/14 (2006.01)

CPC C01B 7/0743 (2013.01) [B01D 53/1493 (2013.01); B01D 2252/2053 (2013.01); B01D 2252/30 (2013.01); B01D 2257/2025 (2013.01)]

13 Claims

1. A process for the reversible storage of chlorine from chlorine-containing gas in a storage medium, the process comprising:

contacting chlorine-containing gas with a liquid storage medium in a first step to form a loaded storage medium, the liquid storage medium comprising an ionic compound (I) having the formula

N—R1_mR2_nR3_o⁺Cl_r⁻ (I);

wherein the loaded storage medium comprises chlorine from the chlorine- containing gas in an ionic compound (III) having the formula

N—R1_mR2_nR3_o⁺Cl_(r+2)⁻ (III);

wherein each of R1, R2 and R3 independently comprise an alkyl radical selected from the following group: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, and 2-methylpropyl;

wherein R1, R2, and R3 collectively comprise more than one type of alkyl radical:

wherein m is an integer in a range of 0 to 3, n is an integer in a range of 0 to 3, o is an integer in a range of 0 to 3, and wherein a sum consisting of m, n, and o is 4; and

wherein r is an odd number in a range of 1 to 7, and wherein s is an odd number in a range of 1 to 7;

removing chlorine from the loaded storage medium by increasing a temperature of the storage medium and/or lowering a partial pressure above the storage medium, thereby discharging chlorine.