Weak nitric acid 60 wt% to storage

What it is

Unallocated foreground LCI of Weak nitric acid, dual-pressure ammonia oxidation (1000 t/d HNO3 as 60 wt% acid), case design, derived from the flowsheet by cheme assess lca.

Reference product

1 kilogram of Weak nitric acid 60 wt% to storage (5 bar(a), 40 degC, 60 % HNO3 (mass))

Chemical

nitric-acid

CAS

7697-37-2

Code

nitric-acid-1:weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid:product:ACID

Dataset

weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid version 0.1.0 · UUID 77106ddc-f08a-5f02-8aab-2891be54a2e0

Activity UUID

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

Database

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

Process

Weak nitric acid by dual-pressure ammonia oxidation (1000 t/d HNO3 as 60 wt% acid)

Geography

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

Time period

2026 · valid until 2031

Technology

dual-pressure ammonia oxidation (0.5 / 1.1 MPa(a)) over Pt/Rh, heat recovery to HP steam, absorption to 60 wt% HNO3, tertiary N2O decomposition and SCR, tail-gas expander; 1000 t/d HNO3 · level current

Boundary

gate-to-gate foreground of the plant

Production volume

555,555,200 kg/a (product:ACID per hour x operation.hours_per_year (8000 h/a))

Classification

ISIC Rev.4 2012 (taxonomy/families.yaml (ISIC Rev.4) of the process's families)

System model

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

Allocation

shares, 100 % of the dataset to this product (rule deviation, from study)

The library hierarchy allocates exported steam by energy or exergy (docs/system-model.md). Neither applies here: the acid has no energy content, so energy allocation would put every burden on the steam, and no property package covers HNO3-water (D-012), so the acid's exergy cannot be calculated; the steam is counted in kWh, so the WBCSD price ratio does not apply either. Shares 1/0 are the conservative choice for the acid until the exergy of both products is available (DESIGN.md D-014).

Rights

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

Exchanges per 1 kilogram of Weak nitric acid 60 wt% to storage

As exported: allocated and scaled to the reference product. Provenance: 10 assumed, 1 calculated. 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 Weak nitric acid 60 wt% to storage, 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/nitric-acid-1/lca/dataset.yaml in library version c3ab348.

Used by

• Sodium nitrite, dried, 99.0 wt-% (to bagging and storage) sodium-nitrite-1:sodium-nitrite-from-ammonia-oxidation-and-soda-absorption-2.5-t-h-nano2-nano3-co-product:product:NANO2
• Sodium nitrate, dried (co-product) sodium-nitrite-1:sodium-nitrite-from-ammonia-oxidation-and-soda-absorption-2.5-t-h-nano2-nano3-co-product:product:NANO3

How good it is

Review

Not reviewed: no LCI review record yet

Data quality

DQR 2.33 · PEF-style DQR 2.75

TeR 3 · GeR 3 · TiR 1 · P 4 · C 4 · weakest TeR · primary data 0 %

Mass and carbon closure

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

• lci-carbon-origin: not-assessable
• lci-element-balance: not-assessable
• lci-mass-balance: closed

• element balance not assessable: no composition for consumable:pt-rh-gauze-loss (no composition)
• carbon balance not assessable: no composition for consumable:pt-rh-gauze-loss (no composition)

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 nitric-acid-1:weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid:product:ACID
• cheme-as-code-atlas-preview-c3ab348-olca-jsonld.zip · openLCA JSON-LD (olca-schema) (2) · the whole database
  process 77106ddc-f08a-5f02-8aab-2891be54a2e0 (processes/77106ddc-f08a-5f02-8aab-2891be54a2e0.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 nitric-acid-1:weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid · 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", "nitric-acid-1:weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid:product:ACID"))

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

Weak nitric acid 60 wt% to storage, from Weak nitric acid by dual-pressure ammonia oxidation (1000 t/d HNO3 as 60 wt% acid) (dataset weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid 0.1.0), ChemE-as-Code Process Atlas LCI database preview-c3ab348, activity nitric-acid-1:weak-nitric-acid-dual-pressure-ammonia-oxidation-1000-t-d-hno3-as-60-wt-acid:product:ACID. 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}
}