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.
Anhydrous hydrogen iodide by gas-phase catalytic synthesis from hydrogen and iodine
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.
Research outputNot engineering advice and not an approved design: do not use it for construction, operation or safety decisions. What this means
Overview
- Capacity
- per tonne of anhydrous hydrogen iodide (the dataset's basis); no plant size
What goes in and out
In
Out
- Hydrogen iodideMain productanhydrous HI gas, not hydriodic acid
- HydrogenEmissionunconverted hydrogen, vented (ASSUMED fate)
- IodineEmission0.2 % of the iodine fed, Hischier et al. 2005 default
- IodineWasteoutput: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)
Utilities: Electricity (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)
Life cycle assessment
No footprint assessed yet; the process is part of the life-cycle inventory below.
In the open LCI database (cheme-as-code-atlas-preview-a3c52e4) as Hydrogen iodide, anhydrous Preliminary.
Download it for Brightway, openLCA and other tools.
In the LCI database: system model, datasets and KPIs against the benchmarks
In the LCI database
- Status
- Preliminary 1 unmapped exchange. Some exchanges have no background mapping yet: they are exported unlinked and count no burden, so the inventory is incomplete.
- System model
- attributional, cut-off (methodology 1.1.0)
- Allocation
- mass (single-output, from default) · product:hydrogen-iodide 100 %
- Allocation findings
- none
- Change report
- Not available: this build has no change report against an earlier release.
- Dataset pages
- Hydrogen iodide, anhydrous Preliminary
KPI benchmark positions
| KPI | Value | Reference range | Position |
|---|---|---|---|
| HI made per iodine fed, as a fraction of the stoichiometric HI | – kg/kg | 0.895 to 0.958 kg/kg | not evaluated |
| Electricity per t of hydrogen iodide 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. | – kWh/t | not available | not evaluated |
| Heat per t of hydrogen iodide 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. | – kWh/t | not available | not evaluated |
Maturity and review
Design maturity Concept (claimed): An idea or first flowsheet; numbers are rough. No independent engineering review yet. Automated checks passing is not a review.
Calculation maturity, from the checked evidenceNot assessed
The process has no maturity report (cheme maturity, checks/maturity.json), so no calculation maturity is established.
No level shownThe design maturity (Concept) is the manifest's claim, not evidence. A level appears here once the process's repository holds a current report from
cheme maturity --write.Artifact completeness
Which deliverables exist. They never raise a calculation maturity level: a drawing from unchecked numbers is still unchecked.
Not reported without a maturity report.
Independent review
Not independently reviewed
No independent engineering review yet. Automated checks passing is not a review.
Set by people only. Reaching a calculation maturity level or passing automated checks is not an independent review or an approval.
Where the evidence comes from
- Report
processes/hydrogen-iodide-1/checks/maturity.json(not in the library)- Method
- How ChemE-as-Code checks the levels (requirement by requirement)
Open items
0 open items · 0 closed
New action itemNew engineering holdNew technical queryNew design changeAll issues
Sources
- Library version
- a3c52e4 (process last changed in a3c52e4)
- Data
- Catalog record (JSON) · CC-BY-4.0
- Files
- View the files on GitHub · change history and authors
References
- 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)
- 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)
- 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) · doi:10.1065/lca2004.10.181.7
How to cite
For the data, cite the Process Atlas paper; for the platform that builds and checks it, the ChemE-as-Code paper.
Schweidtmann, A. M. & Weber, J. M. (2026, in preparation). Process Atlas: an open, git-native, reproducible library and life cycle inventory of chemical processes (working title).
For this process: "Anhydrous hydrogen iodide by gas-phase catalytic synthesis from hydrogen and iodine", ChemE-as-Code process library, version a3c52e4.
BibTeX
@unpublished{schweidtmann_process_atlas,
author = {Schweidtmann, Artur M. and Weber, Jana M.},
title = {{Process Atlas: an open, git-native, reproducible library and life cycle inventory of chemical processes (working title)}},
year = {2026},
url = {https://atlas.cheme-as-code.org},
note = {in preparation}
}Schweidtmann, A. M. (2026). ChemE-as-Code: An Open-Source Platform for Agentic AI in Chemical Engineering. arXiv:2611.07947. https://doi.org/10.48550/arXiv.2611.07947
BibTeX
@misc{schweidtmann_cheme_as_code,
author = {Schweidtmann, Artur M.},
title = {{ChemE-as-Code: An Open-Source Platform for Agentic AI in Chemical Engineering}},
year = {2026},
eprint = {2611.07947},
archivePrefix = {arXiv},
doi = {10.48550/arXiv.2611.07947},
url = {https://arxiv.org/abs/2611.07947}
}