{
  "url": "https://openlegislation.uk/eu-decision-2013-732/annex/division-4/division-6",
  "json_url": "https://openlegislation.uk/eu-decision-2013-732/annex/division-4/division-6.json",
  "legislation": "eudn/2013/732",
  "legislation_title": "Commission Implementing Decision of 9 December 2013 establishing the best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions, for the production of chlor-alkali (notified under document C(2013) 8589) (Text with EEA relevance) (2013/732/EU)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2013-732",
  "path": "annex/division/4/division/6",
  "kind": "division",
  "number": "6",
  "heading": "Emissions to air",
  "text": "BAT 8: In order to reduce channelled emissions of chlorine and chlorine dioxide to air from the processing of chlorine, BAT is to design, maintain and operate a chlorine absorption unit that incorporates an appropriate combination of the following features:\n(i) absorption unit based on packed columns and/or ejectors with an alkaline solution (e.g. sodium hydroxide solution) as scrubbing liquid;\n(ii) hydrogen peroxide dosing equipment or a separate wet scrubber with hydrogen peroxide if necessary to reduce chlorine dioxide concentrations;\n(iii) size suitable for the worst case scenario (derived from a risk assessment), in terms of produced chlorine quantity and flowrate (absorption of the full cell room production for a sufficient duration until the plant is shut down);\n(iv) size of the scrubbing liquid supply and storage capacity suitable to ensure an excess at all times;\n(v) in the case of packed columns, their size should be suitable to prevent flooding at all times;\n(vi) prevention of ingress of liquid chlorine into the absorption unit;\n(vii) prevention of backflow of scrubbing liquid into the chlorine system;\n(viii) prevention of solids precipitation in the absorption unit;\n(ix) use of heat exchangers to limit the temperature in the absorption unit below 55 °C at all times;\n(x) supply of dilution air after chlorine absorption to prevent the formation of explosive gas mixtures;\n(xi) use of construction materials which withstand the extremely corrosive conditions at all times;\n(xii) use of backup equipment, such as an additional scrubber in series with the one in operation, an emergency tank with scrubbing liquid feeding the scrubber by gravity, stand-by and spare fans, stand-by and spare pumps;\n(xiii) provision of an independent backup system for critical electrical equipment;\n(xiv) provision of an automatic switch to the backup system in case of emergencies, including periodic tests on this system and the switch;\n(xv) provision of a monitoring and alarm system for the following parameters:\n(a) chlorine in the outlet of the absorption unit and the surrounding area;\n(b) temperature of the scrubbing liquids;\n(c) reduction potential and alkalinity of the scrubbing liquids;\n(d) suction pressure;\n(e) flowrate of scrubbing liquids.\nThe BAT-associated emission level for chlorine and chlorine dioxide, measured together and expressed as Cl2, is 0,2 – 1,0 mg/m3, as an average value of at least three consecutive hourly measurements performed at least once every year at the outlet of the chlorine absorption unit. The associated monitoring is in BAT 7.\nBAT 9: The use of carbon tetrachloride for the elimination of nitrogen trichloride or the recovery of chlorine from tail gas is not BAT.\nBAT 10: The use of refrigerants with a high global warming potential, and in any case higher than 150 (e.g. many hydrofluorocarbons (HFCs)), in new chlorine liquefaction units cannot be considered BAT.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2013/732/annex/division/4/division/6",
    "retrieved_at": "2026-11-01T15:14:56.261571+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}