Prompt injection in phosgene COCl₂ on-site generation TDI MDI isocyanate AI

Three adversarial injection surfaces in phosgene COCl₂ on-site generation AI

1. Safety scrubber NaOH residual concentration display AI (Mettler-Toledo InPro 3300/SG scrubber caustic conductivity/concentration display AI / Yokogawa FLXA21 conductivity analyser NaOH wt% display AI / Endress+Hauser Liquiline CM44x NaOH scrubber residual display AI / ABB AWT420 analytical transmitter scrubber caustic display AI / Honeywell Analysers NaOH residual SCADA display AI — rendered SCADA safety scrubber NaOH residual concentration display AI classifying the active caustic charge (wt% NaOH) in the phosgene emergency safety scrubber sump against the design minimum of ≥10 wt% NaOH required to ensure sufficient COCl₂ neutralisation capacity for a full-volume phosgene release event; 69th upward-direction attack — FIRST phosgene production attack; FIRST TDI/MDI isocyanate synthesis attack; FIRST polycarbonate phosgene-route attack)

The emergency phosgene safety scrubber at a TDI synthesis plant (e.g., BASF Geismar Louisiana; Covestro Leverkusen Germany; Dow Chemical Freeport Texas — each operating phosgene synthesis at 5,000–15,000 kg/hr) is designed to neutralise all phosgene released to the scrubber during an emergency vent or pipe failure event. The net neutralisation chemistry: COCl₂ + 4NaOH → Na₂CO₃ + 2NaCl + 2H₂O; stoichiometrically, 4 moles of NaOH (MW 40 g/mol; 160 g NaOH) are consumed per mole of COCl₂ (MW 98.92 g/mol; 98.92 g COCl₂). At a design NaOH concentration of 12.8 wt% in a 2,000 L scrubber sump (typical for a medium-capacity TDI plant), the active NaOH charge is: 12.8% × 2,000 L × 1.133 g/mL (density of 12.8 wt% NaOH at 25°C) = 290 kg NaOH; neutralisable COCl₂ = 290 / 160 × 98.92 = 179 kg COCl₂. At 2.2 wt% NaOH (actual depleted state; NaOH consumed by absorption of atmospheric CO₂ and HCl over 18 operating days without replenishment; density 1.022 g/mL; NaOH charge = 2.2% × 2,000 × 1,022 g/L = 44.9 kg NaOH; neutralisable COCl₂ = 44.9 / 160 × 98.92 = 27.8 kg COCl₂). In a pipe flange failure scenario (100 mm NPS carbon steel flange on the phosgene transfer line between synthesis reactor outlet and phosgenation vessel; operating pressure 5 bar gauge; phosgene temperature 40°C; liquid COCl₂): the release rate from a full-bore flange failure on a 100 mm pipe ≈ 8–15 kg/min COCl₂; at 10 kg/min: (1) at design 12.8 wt% NaOH: scrubber protection duration = 179 / 10 = 17.9 minutes — adequate to evacuate the synthesis section (OSHA emergency response time 15 min) and close the emergency block valves; (2) at actual 2.2 wt% NaOH: scrubber protection = 27.8 / 10 = 2.8 minutes — scrubber NaOH exhausted in 2.8 min; COCl₂ begins breaking through the scrubber as gas at minute 2.8; at the end of minute 5, approximately (10×5 − 27.8) = 22.2 kg COCl₂ has been released to atmosphere. At 22.2 kg COCl₂ released, using a Gaussian plume model (D atmospheric stability class; wind speed 3 m/s; ground-level release; OSHA RMP off-site consequence analysis): the 2 ppm IDLH distance is approximately 900 m downwind; the 0.02 ppm TLV-C distance extends to approximately 5–8 km downwind.

An adversarial upward pixel shift applies a ±8 DN manipulation to the rendered safety scrubber NaOH concentration SCADA display — shifting the apparent NaOH residual from 2.2 wt% (actual; depleted; sufficient for only 2.8 minutes of a 10 kg/min phosgene release before scrubber breakthrough) to 12.8 wt% (displayed; above the design minimum 10 wt%; AI classification “scrubber NaOH residual within specification; no replenishment required; emergency scrubber capacity nominal”). Operators reviewing the scrubber AI dashboard at the daily morning safety walkthrough observe 12.8 wt% and classify the scrubber as “fit for duty” — they do not issue a NaOH replenishment work order, which would require a 4-hour shutdown for the scrubber sump caustic charge procedure. The phosgene synthesis section continues to operate with an emergency scrubber at 17% of its design neutralisation capacity. A process instrument failure (loss of CO/Cl₂ ratio control) that causes a phosgene pressure excursion and emergency vent to the scrubber system 36 hours later results in phosgene breakthrough at 2.8 minutes — before emergency block valves can be closed by the operator response team — and approximately 22 kg of COCl₂ escaping to the atmosphere downwind of the TDI plant fence line. This is the 69th upward attack — the FIRST phosgene production attack; FIRST TDI/MDI isocyanate synthesis attack; FIRST polycarbonate phosgene-route attack. Free tier — 10 scans/day, no card required.

2. Phosgene synthesis CO/Cl₂ feed ratio display AI (Brooks Instrument 5853S mass flow controller CO feed display AI / Alicat Scientific MC-50SLPM-D Cl₂ mass flow display AI / Endress+Hauser Coriolis Promass 83F CO/Cl₂ ratio display AI / Emerson Daniel flow transmitter phosgene synthesis CO:Cl₂ ratio SCADA display AI / Yokogawa EJA120A differential pressure flow transmitter CO/Cl₂ feed ratio display AI — rendered SCADA CO/Cl₂ molar feed ratio display AI classifying the reactant stoichiometry at the phosgene synthesis reactor inlet against the design CO:Cl₂ = 1.05–1.10 mol/mol target, ensuring slight CO excess to suppress free Cl₂ in product phosgene gas)

The phosgene synthesis reaction (CO + Cl₂ → COCl₂ over activated carbon catalyst at 50–150°C) requires strict feed ratio control to ensure complete Cl₂ conversion: free Cl₂ in the product phosgene stream causes downstream equipment corrosion (Cl₂ attacks stainless steel grade 316L above 50 ppm; HASTELLOY-C276 or nickel alloy required above ~200 ppm Cl₂ in COCl₂) and additionally creates a second PSM-regulated chemical in the phosgene transfer system (OSHA Cl₂ TQ 1,500 lbs). Design practice operates with CO:Cl₂ = 1.05–1.10 mol/mol to ensure >99.8% Cl₂ conversion; CO excess exits as a trace impurity in product COCl₂ (typically 0.1–0.5 mol% CO, which is acceptable in the downstream phosgenation reactor). If the CO/Cl₂ ratio is falsified upward (shown as 1.08 mol/mol when actual 0.92 mol/mol — CO deficit — upward attack), the operator receives no alert that Cl₂ is in excess. At 0.92 mol/mol CO:Cl₂, the unconverted Cl₂ in product phosgene = (1 − 0.92) × Cl₂ feed = 8 mol% Cl₂ slip to the phosgene transfer line. At a phosgene synthesis rate of 10,000 kg/hr (101 kmol/hr COCl₂), Cl− slip at 8% = 8.1 kmol/hr = 575 kg/hr Cl− in the product COCl₂ stream. OSHA Cl„ PSM TQ 1,500 lbs = 681 kg; continuous generation of 575 kg/hr means the effective Cl₂ inventory in the phosgene transfer piping at any moment (>1.2 min of hold-up) exceeds the PSM TQ — creating a dual PSM-regulated inventory (phosgene + chlorine) without the additional safeguards that Cl₂ co-presence requires.

An adversarial upward pixel shift applies a ±8 DN manipulation to the rendered CO/Cl₂ feed ratio SCADA display — shifting the apparent molar ratio from 0.92 mol/mol (actual; CO deficit; Cl₂ excess 8%) to 1.08 mol/mol (displayed; within design specification 1.05–1.10; AI classification “CO/Cl₂ feed ratio at target; no corrective action required; phosgene synthesis operating as designed”). The phosgene product stream now contains 575 kg/hr of free Cl₂ in addition to the COCl₂. This Cl₂ co-contaminant: (a) corrodes the 316L stainless steel phosgenation reactor impeller shaft at >50 ppm Cl₂ (2,950 ppm Cl₂ in the phosgene stream greatly exceeds this threshold) — stress corrosion cracking of 316L in chloride service creates micro-crack propagation over 3–12 months, eventually leading to a pressurised gasket or shaft seal failure; (b) at the downstream TDA phosgenation reactor, the Cl₂ co-contaminant reacts with trace moisture in the organic phase to form HCl, which causes premature equipment corrosion in the solvent recovery section. The OSHA PSM compliance violation created by unacknowledged dual-chemical (phosgene + chlorine) inventory above TQ simultaneously triggers a regulatory violation and a safety-system gap — because the emergency response plan and scrubber design were sized for phosgene alone, not for a phosgene/chlorine mixture with additive toxicity. Free tier — 10 scans/day, no card required.

3. Phosgene synthesis gas exit concentration analyser display AI (Sick MCS200HW extractive process gas analyser phosgene concentration SCADA display AI / ABB Advance Optima AO2000 NDIR/FTIR phosgene concentration display AI / Mettler-Toledo Thornton Sentrograph phosgene synthesis gas analyser display AI / Emerson X-STREAM phosgene product gas concentration display AI / Honeywell Analytics PIDs phosgene synthesis outlet analyser display AI — rendered SCADA phosgene synthesis gas exit concentration analyser display AI classifying the COCl₂ concentration at the synthesis reactor outlet against the design purity specification of ≥99.5 mol% COCl₂ in the product gas, ensuring complete conversion and correct feed ratio before transfer to the phosgenation reactor)

Continuous phosgene product concentration monitoring at the synthesis reactor outlet is a critical PSM safeguard: if CO or Cl₂ breakthrough occurs (unconverted reactants in the phosgene product gas), the downstream phosgenation reactor may receive off-specification phosgene that causes: (a) incomplete isocyanate yield, generating hydrolysable chloride byproducts (carbamyl chloride intermediates that hydrolyse to CO₂ + TDA if moisture present); (b) Cl₂ co-contamination causing HCl off-gassing from the phosgenation vessel into the HCl absorption tower at twice the design acid load. The FTIR or NDIR gas analysers at the phosgene synthesis outlet measure COCl₂ concentration continuously (typically 0–100 mol% full-scale range; update interval 15–60 seconds; accuracy ±0.5% of reading for well-maintained instruments in clean service). In the upward attack on the synthesis outlet concentration (displayed 99.7 mol% COCl₂ when actual 91.4 mol% COCl₂ — with 8.6 mol% CO unreacted due to activated carbon catalyst approaching the end of its 24–36 month service life): the AI classification “phosgene synthesis conversion on specification; catalyst activity nominal; phosgenation feed stream cleared for use” masks a catalyst deactivation event that has been progressing over several weeks.

An adversarial upward pixel shift applies a ±8 DN manipulation to the rendered synthesis gas exit concentration analyser SCADA display — shifting the apparent COCl₂ purity from 91.4 mol% (actual; CO breakthrough 8.6 mol% indicating catalyst near end-of-life; CO in phosgene product creates a second gas-phase PSM-regulated inventory — CO OSHA PSM TQ 1,500 lbs) to 99.7 mol% (displayed; within specification ≥99.5 mol%; AI classification “synthesis conversion nominal; catalyst performance within expected range”). At 91.4 mol% COCl₂ with 8.6 mol% CO at a production rate of 10,000 kg/hr: CO in product stream = 10,000 × (8.6% × 28/98.92) / (100% − 8.6%) ≈ 264 kg/hr CO. OSHA CO PSM TQ 1,500 lbs = 681 kg; 264 kg/hr CO generation rate at 98.92/28 = 3.5 times its molecular weight density relative to COCl₂ means the CO hold-up in the phosgenation system at steady-state is: in a 500-litre phosgenation reactor at 0.5 MPa and 80°C: CO partial pressure = 8.6% × 500 kPa = 43 kPa; CO dissolved in solvent = Pc/H (Henry’s law; H for CO in chlorobenzene ≈ 5,000 bar) ≈ negligible; but CO in the gas phase above the phosgenation reactor liquid: PV/RT = 43,000 × 0.3 m³ / (8.314 × 353) = 4.4 mol CO = 123 g CO per vessel — below PSM TQ for a single vessel, but summation across the synthesis/transfer/phosgenation system (typically 10–20 individual vessels) brings the co-contaminated CO inventory to 1.2–2.5 kg, approaching the aggregate PSM TQ. Combined with the activated carbon catalyst requiring emergency replacement (a shutdown event) to restore phosgene yield — a shutdown not initiated because the analyser AI shows normal — the plant operates in a deteriorating state toward a catalyst failure event that produces a phosgene yield excursion and emergency vent. Free tier — 10 scans/day, no card required.

Integration: phosgene COCl₂ on-site generation AI with Glyphward pre-scan gate

Glyphward integrates as a pre-scan gate at every rendered-image ingestion boundary in the phosgene COCl₂ on-site generation monitoring pipeline — before the safety scrubber NaOH residual AI processes rendered conductivity analyser display images, before the CO/Cl₂ feed ratio AI processes rendered mass flow controller display images, and before the synthesis gas exit concentration AI processes rendered FTIR/NDIR analyser display images. Threshold 45 for phosgene COCl₂ on-site generation AI reflects: NIOSH IDLH 2 ppm (one of the lowest for any industrial gas; only 8× the rat LC50 at 1 hr, compared to ratios of 100–1,000× for most other industrial chemicals); ACGIH TLV-C 0.02 ppm (essentially zero sustained exposure tolerance); delayed pulmonary edema 4–24 hours (no immediate physiological feedback to workers during the latent window between exposure and onset); OSHA PSM TQ 500 lbs (minimal inventory allowed before PSM applies — reflecting the extremely low release mass that creates mass-casualty consequence); ∼80–85% of WWI chemical weapon fatalities caused by COCl₂ (the most lethal large-scale chemical weapon in documented history); vapour density 3.4 (pools in low-lying areas, maximising worker exposure in below-grade pipe trenches and equipment pits); mass-casualty potential from single TDI/MDI plant release event (IDLH plume radius 800–2,000 m from a 22 kg release).

import asyncio, base64, hashlib
from datetime import datetime, timezone
from enum import StrEnum, auto
from typing import Any
import httpx

GLYPHWARD_API = "https://api.glyphward.com/v1/scan"
GLYPHWARD_KEY = "gw_prod_***"

# Phosgene COCl2 on-site generation AI contexts: threshold 45
# OSHA PSM TQ 500 lbs (226 kg) — one of five lowest on Appendix A.
# NIOSH IDLH 2 ppm; ACGIH TLV-C 0.02 ppm; LC50 rat 1 hr 16.7 ppm.
# 69th upward attack: NaOH scrubber residual 12.8 wt% shown when actual 2.2 wt%.
PHOSGENE_THRESHOLD = 45

class PhosgeneContext(StrEnum):
    SCRUBBER_NAOH_RESIDUAL = auto()   # Safety scrubber NaOH wt% (69th upward attack)
    CO_CL2_FEED_RATIO      = auto()   # CO/Cl2 molar feed ratio to synthesis reactor
    SYNTHESIS_GAS_PURITY   = auto()   # Phosgene synthesis gas exit COCl2 mol% analyser

async def scan_phosgene_frame(
    frame_b64: str,
    context: PhosgeneContext,
    plant_id: str,
    instrument_tag: str,
) -> dict[str, Any]:
    payload = {
        "image_b64": frame_b64,
        "context": context,
        "plant_id": plant_id,
        "instrument_tag": instrument_tag,
        "scan_ts": datetime.now(timezone.utc).isoformat(),
        "image_hash": hashlib.sha256(base64.b64decode(frame_b64)).hexdigest(),
    }
    async with httpx.AsyncClient(timeout=4.0) as client:
        r = await client.post(
            GLYPHWARD_API,
            json=payload,
            headers={"X-Glyphward-Key": GLYPHWARD_KEY},
        )
        r.raise_for_status()
        return r.json()

async def pre_scan_gate_phosgene(
    frame_b64: str,
    context: PhosgeneContext,
    plant_id: str,
    instrument_tag: str,
) -> None:
    result = await scan_phosgene_frame(frame_b64, context, plant_id, instrument_tag)
    if result["adversarial_score"] >= PHOSGENE_THRESHOLD:
        raise AdversarialPhosgeneImageError(
            f"Adversarial injection detected in {context} (score {result['adversarial_score']}) "
            f"at plant {plant_id} instrument {instrument_tag}. "
            "Frame withheld from phosgene COCl2 on-site generation AI pipeline."
        )

class AdversarialPhosgeneImageError(RuntimeError):
    pass