Hydrogen product 99.9 mol% to battery limit

What it is

Unallocated foreground LCI of Hydrogen by steam methane reforming (100 000 Nm3/h, PSA, steam export), case design, derived from the flowsheet by cheme assess lca.

Reference product

1 kilogram of Hydrogen product 99.9 mol% to battery limit (28.5 bar(a), 40 degC, 99.8996 % H2 (mole))

Chemical

hydrogen

CAS

1333-74-0

Code

hydrogen-1:hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export:product:H2

Dataset

hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export version 0.1.0 · UUID 77419871-8deb-597d-a41b-2c2d464802e7

Activity UUID

not available (the library assigns none; use the code)

Database

cheme-as-code-atlas-preview-c3ab348 (version preview-c3ab348)

Process

Hydrogen by natural-gas steam methane reforming with PSA (100 000 Nm3/h, steam export)

Geography

GLO · background inputs with a site rule link at the user's site location (default DE)

Time period

2026 · valid until 2031

Technology

natural-gas steam methane reforming, top-fired tubular reformer, HT shift, hydrogen PSA, tail gas firing, steam export; 100 000 Nm3/h · level current

Boundary

gate-to-gate foreground of the plant

Production volume

76,252,596 kg/a (product:H2 per hour x operation.hours_per_year (8400 h/a))

Classification

ISIC Rev.4 2011 (taxonomy/families.yaml (ISIC Rev.4) of the process's families)

CPC 34210 · HS 2804.10 (chemicals/chemicals.yaml (hydrogen))

System model

attributional, cut-off (docs/system-model.md, methodology 1.1.0)

Allocation

exergy, 90.1 % of the dataset to this product (rule deviation, from study)

Hydrogen and steam are not products of one separation, so neither curated physical rule of the hierarchy fits exactly, and the WBCSD price ratio is not available (no sourced prices at concept). Exergy is chosen because the library allocates exported steam by energy or exergy and steam has no heating value; it weighs the steam by its work potential rather than by its enthalpy (DESIGN.md D-013).

Rights

CC-BY-4.0: the ChemE-as-Code process library's own concept design (LICENSE-DATA)

Exchanges per 1 kilogram of Hydrogen product 99.9 mol% to battery limit

As exported: allocated and scaled to the reference product. Provenance: 12 assumed, 1 calculated, 2 estimated. Pedigree scores (1 best, 5 worst): reliability, completeness, temporal correlation, geographical correlation, further technological correlation.

Elementary flows

The streams are the plant's own flows: an amount here is allocated and per 1 kilogram of Hydrogen product 99.9 mol% to battery limit, so it differs from the stream's flow, and it can sum several streams.

Where these numbers come from: each exchange names its source above; the dataset is processes/hydrogen-1/lca/dataset.yaml in library version c3ab348.

Used by

• Hydrogen bromide, Hydrobromic acid 48 wt-% to storage hydrogen-bromide-1:hydrogen-bromide-synthesis-and-absorption-2.08-t-h-hydrobromic-acid-48-wt:product:HBRACID

How good it is

Review

Not reviewed: no LCI review record yet

Data quality

DQR 3 · PEF-style DQR 3.25

TeR 3 · GeR 5 · TiR 1.0005 · P 4 · C 4 · weakest GeR · primary data 0 %

Mass and carbon closure

Assessed (lca/manifest.json balance, tolerance 5 %: design maturity concept (sourced screening))

• lci-carbon-origin: closed
• lci-element-balance: closed
• lci-mass-balance: closed

Change report

Not available: this build has no change report against an earlier release.

KPI benchmark positions

Not available: no benchmarked KPI for this dataset.

How to use it

Downloads

• cheme-as-code-atlas-preview-c3ab348.xlsx · bw2io ExcelImporter workbook (bw2io 0.9 Excel layout) · the whole database
  code hydrogen-1:hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export:product:H2
• cheme-as-code-atlas-preview-c3ab348-olca-jsonld.zip · openLCA JSON-LD (olca-schema) (2) · the whole database
  process 77419871-8deb-597d-a41b-2c2d464802e7 (processes/77419871-8deb-597d-a41b-2c2d464802e7.json) · the dataset's unallocated multi-output process; this product's allocation factor is in it
• cheme-as-code-atlas-preview-c3ab348-multifunctional.json · Brightway 2.5 multifunctional database (JSON, for the multifunctional package) (cheme-as-code/lci-multifunctional/v1) · the whole database
  code hydrogen-1:hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export · the dataset unallocated, with all its products; this product is its desired_code
• cheme_as_code_lci-0.1.0-py3-none-any.whl · the installer

A file with this activity alone is not available: each file above is the whole database, and the line under it says how to find this activity there.

import bw2data as bd
from cheme_as_code_lci import install

bd.projects.set_current("my-project")   # holds your licensed background + biosphere3
install("cheme-as-code-atlas-preview-c3ab348.xlsx", background="ecoinvent-3.11-cutoff", location="DE")
activity = bd.get_activity(("cheme-as-code-atlas-preview-c3ab348", "hydrogen-1:hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export:product:H2"))

While any exchange of the database has no mapping, install() writes nothing and only lists the unlinked exchanges. So the last line finds no activity until the gaps are mapped: the download section gives the ways to use the database now.

How to cite

Hydrogen product 99.9 mol% to battery limit, from Hydrogen by natural-gas steam methane reforming with PSA (100 000 Nm3/h, steam export) (dataset hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export 0.1.0), ChemE-as-Code Process Atlas LCI database preview-c3ab348, activity hydrogen-1:hydrogen-by-steam-methane-reforming-100-000-nm3-h-psa-steam-export:product:H2. Cite the Process Atlas paper (in preparation, 2026), by Artur M. Schweidtmann and Jana M. Weber, and the ChemE-as-Code Process Atlas LCI database version preview-c3ab348.

DOI: none yet (the Process Atlas paper is in preparation)

@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}
}

@unpublished{schweidtmann_cheme_as_code,
  author = {Schweidtmann, Artur M.},
  title = {{ChemE-as-Code: An Open-Source Platform for AI-Accelerated Chemical Process Engineering (working title)}},
  year = {2026},
  url = {https://cheme-as-code.org},
  note = {in preparation}
}