Method for Separating and Reversible Storing Chlorine Gas from Chlorine Containing Gas and a Storage Medium for Storing Chlorine Gas Used in Said Method

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This invention describes a method and material (a special polymeric compound) for efficiently separating and reversibly storing chlorine gas from gas mixtures, particularly from industrial process off-gases. The technology relies on using solid polymers with alkylated quaternary ammonium groups to adsorb chlorine gas, store it safely in a solid form, and later release it for reuse or employ it as a reagent in chemical syntheses.

Use CasesContent extracted from patent full text and abstract with AI.

• Recovering chlorine from residual gas streams in chlor-alkali plants to improve resource efficiency.
• Purifying process gases by removing chlorine in chemical, petrochemical, or pharmaceutical manufacturing environments.
• Providing a safer, solid-state chlorine storage and transport medium for industrial supply chains.
• Serving as a chlorination agent for chemical synthesis, such as converting alkenes to chlorinated derivatives.
• Recycling chlorine within industrial plants to reduce waste and operational costs.
• Developing engineered devices (e.g., filters, cartridges) for on-demand chlorine capture and release.

BenefitsContent extracted from patent full text and abstract with AI.

• High efficiency and selectivity in capturing chlorine from dilute gas streams, including those with low chlorine content.
• Reversible and repeatable storage: chlorine can be loaded and released multiple times without significant loss of capacity.
• Safe handling—eliminates the need for compressed, liquefied chlorine gas, reducing hazards in storage and transport.
• Solid-state storage medium avoids environmentally harmful solvents (like carbon tetrachloride) previously used for chlorine capture.
• The polymer maintains its solid form during chlorine loading/unloading, offering practical and flexible device integration (powders, pellets, membranes, etc).
• Reduces industrial chlorine loss and potential environmental emissions, leading to more sustainable and eco-friendly processes.
• Materials (such as commercial anion-exchange resins) are readily available or synthetically tunable for specific applications and higher capacities.

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Patent Abstract

The present invention relates to a method for separating and storing (loading) chlorine Cl2 from Cl2 containing gas, in particular Cl2 containing process gas, by contacting the Cl2 containing gas with at least one polymeric compound of general formulae (I) comprising a polymer with at least one alkylated cationic quaternary amino moiety and at least one chloride anion per alkylated quaternary amino moiety [Polymer-(NR1aR2bR3c)] [CI] (I) wherein R1, R2, R3 being independent from each other a C1-C4 alkyl moiety, preferably selected from the group of methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl and sec-butyl, wherein the moieties R1, R2, R3 can be the same or differ from each of the other, wherein a, b, c are independently from each other 0, 1, 2 or 3, wherein the sum of a+b+c has to be 3, wherein the chlorine Cl2 from Cl2 containing gas is bound by the at least one polymeric compound of general formulae (I) thereby providing a polymeric compound of general formulae (II) [Polymer-NR1aR2bR3c][Cl-(Cl2)n] (II) wherein n> 0, preferably n >=1, preferably n being 1-4.