substance
Phosphorous acid (phosphonic acid)
The phosphonic tautomer HP(O)(OH)2 (PubChem CID 407, CAS 13598-36-2), the one the chemicals package lists; PubChem's 'phosphorous acid' P(OH)3 (CID 107909, CAS 10294-56-1) is the other tautomer of the same substance in trade.
- Formula
- H3O3P
- CAS
- 13598-36-2
- InChIKey
- ABLZXFCXXLZCGV-UHFFFAOYSA-N
- ChEBI
- CHEBI:44976
Made by
- Acetyl chloride by semi-batch reaction of acetic acid with PCl3, phase split and batch distillation (2000 t/a)Co-productConcept · not reviewed
Used by
When a process with this chemical is added to the library, it appears here.
Emitted by
- Iodomethane from methanol, red phosphorus and iodine, batch reflux reaction and batch distillation (500 t/a)WasteConcept · not reviewed
Takes part in
- 3C2H4O2+PCl3gives3C2H3ClO+H3O3PProduct · Acetic acid and phosphorus trichloride to acetyl chloride and phosphorous acid · one process
- PCl3+3H2OgivesH3O3P+3HClProduct · Hydrolysis of phosphorus trichloride by the water of the acetic acid · one process
- 6CH4O+2P+3I2gives6CH3I+2H3O3PProduct · Methanol, red phosphorus and iodine to iodomethane and phosphorous acid (via PI3) · one process
Routes compared
One route in the Atlas makes Phosphorous acid (phosphonic acid): nothing to compare yet. A comparison appears when a second route is added.
Per 1 kg of Phosphorous acid (phosphonic acid): inventory from each route's LCI dataset, unallocated; footprints per the functional unit of their own LCA.
| Route | Tier, design maturity, review status | Geography, year | Energy | Feedstocks | Key emissions | Footprint | Comparability |
|---|---|---|---|---|---|---|---|
| Acetyl chloride by semi-batch reaction of acetic acid with PCl3, phase split and batch distillation (2000 t/a)Batch plant: phosphorus trichloride dosed over 2 h into acetic acid at 313 K (semi-batch, 1 mol per 3 mol), held to 0.95 conversion of the PCl3, the HCl of the acid's water vented through a brine condenser to a water scrubber; the lower phase (crude phosphorous acid) settled off, the upper phase distilled at atmospheric pressure in a batch still with a 10-stage column at reflux ratio 1; 1459.9 kg per batch, 1370 batches a year on a dedicated train | flowsheet or hand-writtenDesign maturity: Concept (research)Not independently reviewedDataset review: unreviewed | GLO, 2026 | a co-product of a multi-output dataset (product:ACCL besides it): its share needs the allocation of the LCI database build | no footprint | – | ||
ISO 14044 requires a critical review (by a panel of interested parties, ISO/TS 14071) of a comparative assertion intended to be disclosed to the public. These routes are listed side by side for screening; a statement that one is better than another needs that review. None of these routes has had such a review.