{
  "authors": [],
  "basis": {
    "capacity": "per tonne of anhydrous hydrogen iodide (the dataset's basis); no plant size"
  },
  "benchmarks": [
    {
      "dataset": "hydrogen-iodide-catalytic-gas-phase",
      "expression": "product:hydrogen-iodide * 253.8 / ( 2 * 127.908 ) / feed:iodine",
      "family": "inorganic-chemicals",
      "kpi": "hydrogen-iodide-iodine-efficiency",
      "problem": "1 to kg/kg needs core's foundation.units (pip install 'cheme-as-code[units]')",
      "reference": {
        "basis": "unallocated",
        "conditions": {
          "pressure": "0 to 5 psig",
          "region": "US",
          "technology": "gas-phase H2 + I2 over Ni on alumina, single pass, laboratory",
          "year": 2019
        },
        "id": "us11554956-ni-alumina-per-pass",
        "note": "Per-pass iodine conversion of the runs with 20 and 21 wt% Ni on alumina at 320 to 380 degC (runs 3 to 10 of Table 1, contact time 7.3 to 8.6 s, H2/I2 2.4 to 2.9 mol/mol); the runs at 280 and 300 degC and the 5 wt% Ni run are lower and not included. A laboratory fixed bed, single pass, with the unconverted iodine collected, not an overall plant efficiency with recycle.",
        "range": [
          0.895,
          0.958
        ],
        "source": {
          "accessed": "2026-11-05",
          "citation": "Yang, T. et al. (Honeywell International) US 11 554 956 B2 (2023), Integrated process and catalysts for manufacturing hydrogen iodide from hydrogen and iodine",
          "kind": "other",
          "locator": "Example 1, Table 1",
          "url": "https://patents.google.com/patent/US11554956B2/en"
        }
      },
      "status": "unchecked",
      "title": "HI made per iodine fed, as a fraction of the stoichiometric HI",
      "unit": "kg/kg",
      "value": null
    },
    {
      "dataset": "hydrogen-iodide-catalytic-gas-phase",
      "expression": "feed:electricity / product:hydrogen-iodide",
      "family": "inorganic-chemicals",
      "kpi": "hydrogen-iodide-specific-electricity",
      "no_open_reference": "No open source with an electricity figure for HI production found (2026-11-05). Read: US 8 268 284 B2 and US 11 554 956 B2 (process descriptions and examples, no utility data). Not read: Ullmann's chapter Iodine and Iodine Compounds (doi:10.1002/14356007.a14_381.pub2, licensed). No EU BREF was checked for HI. The dataset's value is core's Tier 0 default, ASSUMED.",
      "problem": "kWh/kg to kWh/t needs core's foundation.units (pip install 'cheme-as-code[units]')",
      "reference": null,
      "status": "unchecked",
      "title": "Electricity per t of hydrogen iodide",
      "unit": "kWh/t",
      "value": null
    },
    {
      "dataset": "hydrogen-iodide-catalytic-gas-phase",
      "expression": "feed:heat / product:hydrogen-iodide",
      "family": "inorganic-chemicals",
      "kpi": "hydrogen-iodide-specific-heat",
      "no_open_reference": "No open source with a heat figure for HI production found (2026-11-05); the same sources were read as for electricity and give operating temperatures (iodine melted at about 120 degC, vaporised at 150 to 170 degC, reactor at 300 to 350 degC) but no duty. The dataset's value is core's Tier 0 default, ASSUMED.",
      "problem": "kWh/kg to kWh/t needs core's foundation.units (pip install 'cheme-as-code[units]')",
      "reference": null,
      "status": "unchecked",
      "title": "Heat per t of hydrogen iodide",
      "unit": "kWh/t",
      "value": null
    }
  ],
  "chemistry": {
    "inputs": [
      {
        "chemical": "iodine",
        "grade": null,
        "inventory_key": "feed:iodine",
        "note": "solid iodine, melted and vaporised; links to iodine-1",
        "role": "feedstock"
      },
      {
        "chemical": "hydrogen",
        "grade": null,
        "inventory_key": "feed:hydrogen",
        "note": "dry hydrogen gas; links to hydrogen-1",
        "role": "feedstock"
      }
    ],
    "outputs": [
      {
        "chemical": "hydrogen-iodide",
        "grade": null,
        "inventory_key": "product:hydrogen-iodide",
        "note": "anhydrous HI gas, not hydriodic acid",
        "role": "main-product"
      },
      {
        "chemical": "hydrogen",
        "grade": null,
        "inventory_key": "emission:H2",
        "note": "unconverted hydrogen, vented (ASSUMED fate)",
        "role": "emission"
      },
      {
        "chemical": "iodine",
        "grade": null,
        "inventory_key": "emission:I2",
        "note": "0.2 % of the iodine fed, Hischier et al. 2005 default",
        "role": "emission"
      },
      {
        "chemical": "iodine",
        "grade": null,
        "note": "output:iodine-loss: the rest of the unconverted iodine, 19.3 kg/t, to wastewater treatment (Hischier et al. 2005 default). A dissolved load, not an iodine product, so it carries no inventory_key and is not resolved through the iodine slug; a reported gap (lca/mappings.yaml)",
        "role": "waste"
      }
    ],
    "utilities": [
      {
        "chemical": "electricity",
        "grade": null,
        "inventory_key": "feed:electricity",
        "note": "core's Tier 0 default (ASSUMED, dated); the dataset's feed:heat (core's default heat from fossil fuel, 555.6 kWh/t) has no registry slug and links by its factor id heat-natural-gas",
        "role": "utility"
      }
    ]
  },
  "description": "",
  "design_basis": null,
  "engineering": null,
  "facets": {
    "feedstock_basis": [
      "mineral",
      "fossil"
    ],
    "product_classes": [
      "chemicals"
    ],
    "region": "generic",
    "unit_operations": [
      "evaporation",
      "reaction",
      "condensation",
      "distillation"
    ]
  },
  "families": [
    "inorganic-chemicals"
  ],
  "gap_count": 1,
  "gates": null,
  "id": "hydrogen-iodide-1",
  "issues": {
    "closed_count": 0,
    "list_url": "https://github.com/ChemE-as-Code/process-library/issues?q=is%3Aissue%20label%3A%22process%3Ahydrogen-iodide-1%22",
    "new": {
      "action": "https://github.com/ChemE-as-Code/process-library/issues/new?template=1-action-item.yml&labels=process%3Ahydrogen-iodide-1&process=hydrogen-iodide-1",
      "change": "https://github.com/ChemE-as-Code/process-library/issues/new?template=4-design-change.yml&labels=process%3Ahydrogen-iodide-1&process=hydrogen-iodide-1",
      "hold": "https://github.com/ChemE-as-Code/process-library/issues/new?template=2-engineering-hold.yml&labels=process%3Ahydrogen-iodide-1&process=hydrogen-iodide-1",
      "process": "https://github.com/ChemE-as-Code/process-library/issues/new?template=6-process-development.yml&labels=process%3Ahydrogen-iodide-1&process=hydrogen-iodide-1",
      "tq": "https://github.com/ChemE-as-Code/process-library/issues/new?template=3-technical-query.yml&labels=process%3Ahydrogen-iodide-1&process=hydrogen-iodide-1",
      "tracker": "https://github.com/ChemE-as-Code/process-library/issues/new?template=7-process-tracker.yml&labels=process%3Ahydrogen-iodide-1&process=hydrogen-iodide-1"
    },
    "open": [],
    "open_by_gate": {},
    "open_count": 0,
    "private": false,
    "repository": "ChemE-as-Code/process-library"
  },
  "keywords": [
    "hydrogen iodide",
    "anhydrous HI",
    "iodine",
    "hydrogen",
    "gas-phase synthesis",
    "platinum catalyst",
    "nickel catalyst",
    "iodine recycle"
  ],
  "lca": null,
  "lci_gaps": [
    {
      "dataset": "hydrogen-iodide-catalytic-gas-phase",
      "key": "output:iodine-loss",
      "link": "technosphere",
      "type": "output"
    }
  ],
  "maintainers": [],
  "maturity": "concept",
  "preliminary": true,
  "provenance": {
    "library_commit": "a3c52e472f42fbc8cdacfeacf5ef28703c004174",
    "previews": null,
    "previews_stale": false,
    "source_commit": "a3c52e472f42fbc8cdacfeacf5ef28703c004174"
  },
  "publication": {
    "license": "CC-BY-4.0",
    "status": "public"
  },
  "references": [
    {
      "title": "US 8 268 284 B2 (Nippoh Chemicals, priority 2008, granted 2012): System and method for producing iodine compound, Example 1 (Pt on alumina, 350 degC, continuous 100 h)",
      "url": "https://patents.google.com/patent/US8268284B2/en"
    },
    {
      "title": "US 11 554 956 B2 (Honeywell International, priority 2019, granted 2023): Integrated process and catalysts for manufacturing hydrogen iodide from hydrogen and iodine, description and Examples 1 and 2 (Ni on alumina)",
      "url": "https://patents.google.com/patent/US11554956B2/en"
    },
    {
      "doi": "10.1065/lca2004.10.181.7",
      "title": "Hischier, R. et al. (2005) Establishing life cycle inventories of chemicals based on differing data availability. Int. J. LCA 10:59-67, section 2.3 (loss defaults, as recorded in core's tier defaults)"
    }
  ],
  "repository": {
    "access": "public",
    "path": "processes/hydrogen-iodide-1",
    "url": "https://github.com/ChemE-as-Code/process-library"
  },
  "representations": [],
  "summary": "Tier 0 screening per tonne of anhydrous HI: stoichiometry H2 + I2 -> 2 HI with the iodine conversion of a continuous 100-hour patent run, unconverted feed lost by the Hischier rule, electricity and heat from core's defaults. No flowsheet; not reviewed.",
  "title": "Anhydrous hydrogen iodide by gas-phase catalytic synthesis from hydrogen and iodine",
  "validation": {
    "status": "unreviewed"
  },
  "viewer": null
}