Storage material and method for chlorine storage

Patent metadata

Field	Value
Publication number	US-2020306723-A1
Application number	US-201716310877-A
Country	US
Kind code	A1
Filing date	Jun 19, 2017
Priority date	Jun 20, 2016
Publication date	Oct 1, 2020
Grant date	—

Abstract

The invention relates to a novel storage material on the basis of nanoporous silicon dioxide particles for the adsorption of chlorine, to the use of said storage material for chlorine recovery and for chlorine liquefaction for the purpose of storing, transport and cleaning.

First claim

1 .- 16 . (canceled)

17 . A porous storage material for the reversible storage of chlorine in liquid phase based on particles of silicon dioxide, in which the particles have pores with a pore diameter of <10 nm, with a maximum in the pore diameter distribution in the range of from 1 nm to 8 nm, and the silicon dioxide is present with a degree of condensation, determined by means of silicon-29 solid-state NMR spectroscopy, of at least 0.91.

18 . The storage material as claimed in claim 17 , wherein the particles have a particle diameter in the range of from 30 nm to 2 μm.

19 . The storage material as claimed in claim 17 , wherein the particles have a mean particle diameter of from 200 nm to 1 μm.

20 . The storage material as claimed in claim 17 , wherein the particles, measured at 0° C. and not more than 3 bar, preferably measured at 0° C. and not more than 2 bar, have a loading capacity of at least 0.4 g of chlorine/g of storage material.

21 . The storage material as claimed in claim 17 , wherein the time taken to load the storage material is <40 minutes (based on 1 g of chlorine per g of material) and the time taken for unloading is <60 minutes (based on 1 g of chlorine per g of material).

22 . A storage body comprising a storage material as claimed in claim 17 , wherein the particles are packed 3-dimensionally in the storage body.

23 . The storage body as claimed in claim 22 , wherein the storage body has additional pores with a pore diameter of at least 20 nm.

24 . A storage system for the reversible storage of chlorine in liquid phase, at least comprising a feed pipe for a chlorine-containing gas, a discharge pipe for chlorine-containing gas, optionally a discharge pipe for residual gas separated from the chlorine, a thermally insulated pressure vessel which is filled with a storage material based on silicon dioxide for the adsorption of chlorine, wherein there is present as the storage material a storage material as claimed in claim 17 .

25 . A method for the reversible storage of chlorine in liquid phase, comprising at least the following method steps:
feeding of a chlorine-containing process gas to a storage material which is maintained at a temperature of not more than 40° C. at a pressure of from 0.25 bar to 10 bar, then either desorption of the stored chlorine by the passage of inert gas through the storage material or desorption of the stored chlorine by either reducing the pressure across the storage material or by increasing the temperature of the storage material, wherein there is used as the storage material a storage material as claimed in claim 17 .

26 . The method as claimed in claim 25 , wherein the method is carried out in a storage system as claimed in claim 24 .

27 . The use of the porous storage material as claimed in claim 17 or of a storage body as claimed in claim 22 for the adsorption of chlorine for the purpose of separating chlorine from chlorine-containing process gases.

28 . The use as claimed in claim 27 , wherein the process gas, in addition to chlorine, contains gases such as hydrogen, oxygen, nitrogen or inert gases such as argon and helium.

29 . The use as claimed in claim 27 , wherein the process gas is the residual gas, containing at least hydrogen, chlorine and oxygen, of a chlorine liquefaction.

30 . The use as claimed in claim 27 , wherein the process gas is the gas, containing at least hydrogen and chlorine, from the catholyte chamber of an HCl diaphragm electrolysis.

31 . The use as claimed in claim 27 , wherein the process gas is the waste gas, containing at least oxygen and chlorine, from a gas-phase oxidation process for the reaction of hydrogen chloride with oxygen.

32 . The use of the porous storage material as claimed in claim 17 or of a storage body as claimed in claim 22 for the liquefaction of chlorine for the purification, storage or operationally safe transport of liquid chlorine.

Assignees

• Covestro Deutschland Ag

Inventors

• Trieu Vinh
• Langstein Gerhard
• Heinz Paul
• Weber Rainer
• Schiesser Yuliya
• Werner Knud
• Haverkamp Verena
• Polarz Sebastian
• Schachtschneider Andreas

Classifications

• B01D53/02

  by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)} · CPC title

• B01D2253/308

  Pore size · CPC title

• B01J20/28011

  Other properties, e.g. density, crush strength · CPC title

• B01D2253/106

  Silica or silicates · CPC title

• B01D2257/2025

  Chlorine · CPC title