Tier 0 screening per tonne of 25 wt% aqueous ammonia: feeds from the product's strength, heat rejected to cooling water from published heats of solution, pump electricity ASSUMED. No flowsheet; not reviewed.
Ammonium hydroxide (aqueous ammonia, 25 wt% NH3) by continuous dilution of liquid ammonia in water
Tier 0 screening per tonne of 25 wt% aqueous ammonia: feeds from the product's strength, heat rejected to cooling water from published heats of solution, pump electricity ASSUMED. 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 25 wt% aqueous ammonia (the dataset's basis); no plant size
What goes in and out
In
Out
- Ammonium hydroxideMain productaqueous ammonia, 25 wt% NH3, 25 degC; a solution, not a pure NH4OH fluid
Utilities: Electricity (pumps only, ASSUMED hydraulic estimate), Cooling water (net heat of solution rejected (kWh), from thermochemical data)
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 Aqueous ammonia (ammonium hydroxide), 25 wt% NH3, 25 degC.
Download it for Brightway, openLCA and other tools.
In the LCI database: system model, datasets and KPIs against the benchmarks
In the LCI database
- System model
- attributional, cut-off (methodology 1.1.0)
- Allocation
- mass (single-output, from default) · product:ammonium-hydroxide 100 %
- Allocation findings
- none
- Change report
- Not available: this build has no change report against an earlier release.
- Dataset pages
- Aqueous ammonia (ammonium hydroxide), 25 wt% NH3, 25 degC
KPI benchmark positions
| KPI | Value | Reference range | Position |
|---|---|---|---|
| Heat rejected to cooling water per t of aqueous ammonia No open source with a measured or design cooling duty for aqueous ammonia production found (2026-11-05). Read: US 4,752,452 (states that the heat of dilution is large, gives no figure), LVIC-AAF BREF 2007 (no aqueous ammonia production section; ammonia solutions only as recycled scrubber liquor), ATSDR 2004 (properties only). The dataset's value is our enthalpy balance from the NBS tables (1982) and the ammonia equation of state, not a check. | – kWh/t | not available | not evaluated |
| Electricity per t of aqueous ammonia No open source with an electricity figure for aqueous ammonia production found (2026-11-05). Read: US 4,752,452 (pumps and fans named, no power), LVIC-AAF BREF 2007, ATSDR 2004. The dataset's value is an ASSUMED pump-work estimate. | – kWh/t | not available | not evaluated |
| NH3 per mass of aqueous ammonia product | – kg/kg | 0.28 to 0.3 kg/kg | 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/ammonium-hydroxide-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
- Harbolt, B.A., Murata, P.L. (Union Oil Company of California) US Patent 4,752,452: Aqueous ammonia process and mixing apparatus therefor, granted 1988-06-21
- Wagman, D.D. et al. (1982) The NBS tables of chemical thermodynamic properties. J. Phys. Chem. Ref. Data 11, Suppl. 2, Table 18:N, p. 2-64
- Gao, K., Wu, J., Bell, I.H., Lemmon, E.W. (2020) Thermodynamic properties of ammonia for temperatures from the melting line to 725 K and pressures to 1000 MPa. J. Phys. Chem. Ref. Data (equation of state as evaluated with CoolProp 8.0.0)
- ATSDR (2004) Toxicological Profile for Ammonia, U.S. Department of Health and Human Services, chapter 4 (Tables 4-1 and 4-2)
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: "Ammonium hydroxide (aqueous ammonia, 25 wt% NH3) by continuous dilution of liquid ammonia in water", 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}
}