Adversarial Injection · Industrial Chemical AI Monitoring · Attack #136

Triethylaluminum TEAl Ziegler-Natta Polyolefin Pyrophoric Activator: N₂ Blanket Failure AI Prompt Injection via Pixel Perturbation

Triethylaluminum (TEAl; Al(C₂H₅)₃; CAS 97-93-8; MW 114.17 g/mol; BP 186.6°C; density 0.835 g/cm³) is the standard co-catalyst activator for Ziegler-Natta TiCl₄-based polyolefin production, reducing titanium(IV) to catalytically active Ti(III)/Ti(II) species at TEAl:Ti molar ratios of 50 to 300:1 — but TEAl is a GHS Category 1 pyrophoric liquid that ignites spontaneously on contact with air and reacts violently with water to produce ethane and heat, requiring continuous N₂ inert blanket protection at all points in its handling, dilution, and feed pathway. A single adversarial pixel perturbation on a DCS display can inflate the N₂ blanket pressure reading from a critically inadequate 0.07 bar to an apparently safe 0.48 bar, suppress the Karl Fischer moisture analyzer output from a fire-initiating 24 ppm down to a benign 0.8 ppm in the hexane carrier solvent, or conceal a reactor-overconcentration feed of 22.8 wt% TEAl as 11.2 wt% — each individually sufficient to initiate a catalyst room fire, explosive atmosphere, or polymerization runaway. Glyphward threshold 44 detects all three surfaces before any downstream LLM safety monitor acts on the falsified display data.

TEAl is the workhorse co-catalyst of the global polyolefin industry: every ton of polypropylene and polyethylene produced via Ziegler-Natta chemistry — collectively exceeding 180 million tons per year worldwide — requires controlled TEAl activation of the TiCl₄/MgCl₂ catalyst precursor. Major licensors and producers include LyondellBasell (Spheripol and Hostalen processes), Borealis (Borstar), INEOS (Innovene G and S), Sabic (Qatofin), ExxonMobil Chemical (Exxpol), Dow Chemical (Dowlex LLDPE at Freeport TX), and TotalEnergies (Lumicene metallocene-PP). TEAl is typically handled as a 10 to 20 wt% solution in anhydrous hexane or heptane and fed to the catalyst activation vessel via metered injection pumps at flow rates precisely controlled to maintain the target TEAl:Ti ratio. The CCPS "Guidelines for Chemical Reactivity Evaluation" documents multiple TEAl fires at polyolefin facilities attributed to N₂ blanket failures and moisture contamination of carrier solvent; a 2004 TEAl drum-handling fire at Dow Chemical Freeport TX caused approximately $15 million in damage and anchors the incident record used in OSHA process hazard analysis training for organoaluminum materials.

The AI monitoring attack surface for TEAl at a Ziegler-Natta polyolefin plant is defined by the compound consequence of three failure modes that the catalyst management system monitors in real time: N₂ blanket integrity (preventing pyrophoric ignition), carrier solvent moisture content (preventing water-reactive ethane generation and TEAl deactivation), and feed concentration (preventing polymerization hotspot and catalyst bed runaway). All three parameters are rendered on DCS displays whose pixel values can be independently manipulated before the AI inference layer reads them — and all three manipulations are plausible within the normal variation range of the respective instrument, making them undetectable by threshold-based alarm logic while remaining detectable by Glyphward's multimodal pixel-perturbation scanner.

Why TEAl Ziegler-Natta Catalyst Activation Is Disproportionately Vulnerable to Pixel Manipulation

Triethylaluminum presents an adversarial monitoring attack profile that is categorically distinct from most industrial hazardous chemicals because its primary hazard — spontaneous ignition in air — requires no ignition source, no heat input, and no process upset beyond the simple failure of inert gas containment. A degreaser fire requires an overtemperature event; a reactive chemical runaway requires a feed error or cooling loss; a toxic gas release requires a vessel breach. TEAl fire requires only the removal of the N₂ blanket that prevents ambient oxygen and moisture from contacting the liquid surface. This makes the N₂ blanket pressure display the single most critical process parameter at a TEAl handling facility — and therefore the single most consequential adversarial pixel target. An AI safety monitoring system that receives a displayed blanket pressure of 0.48 bar (within the design range of 0.40 to 0.80 bar) has no basis to question the adequacy of inert atmosphere protection, even if the actual pressure is 0.07 bar — insufficient to prevent back-diffusion of air into the vessel headspace through any imperfectly sealed fitting, valve stem, or sample port.

The moisture sensitivity of TEAl in hexane carrier solvent adds a second independent pyrophoric pathway. Water reacts with TEAl via the stoichiometry Al(C₂H₅)₃ + 3H₂O → Al(OH)₃ + 3C₂H₆ + heat; at 24 ppm H₂O in hexane, the reaction proceeds fast enough to generate measurable ethane evolution in the closed vessel headspace. If the N₂ blanket has simultaneously failed (compound attack, Surfaces 1 and 2), the ethane accumulates at concentrations approaching and exceeding the LEL of 3.0 vol% in a headspace that now contains both ethane and, as the blanket failure progresses, oxygen. The Karl Fischer moisture analyzer is the only instrument providing continuous real-time moisture measurement in the hexane feed; when its output is falsified by a downward pixel perturbation from 24 ppm to 0.8 ppm, the AI monitoring system has no alternative moisture data source to detect the impending water-reactive ethane generation event.

Surface 1 — N₂ Inert-Blanket Pressure on TEAl Dilution Vessel (Upward Attack)

The N₂ blanket pressure on the TEAl dilution vessel is displayed on a 200 px vertical DCS bar spanning 0 to 1.0 bar gauge. The pixel scale is 200 px ÷ 1.0 bar = 200 px per bar. At the actual N₂ blanket pressure of 0.07 bar, the rendered pixel position is 0.07 × 200 = 14 px from the bottom of the bar. The adversarial perturbation shifts this pixel cluster upward by 82 px to position 96 px. The AI inference engine reads the pressure as 96 ÷ 200 = 0.48 bar — within the design operating range of 0.40 to 0.80 bar for adequate N₂ blanket protection on a TEAl service vessel. The low-pressure alarm setpoint is 0.30 bar; the displayed 0.48 bar is 60% above the alarm threshold. The actual 0.07 bar is 77% below the alarm setpoint and indicates a near-total loss of inert blanket protection.

At 0.07 bar N₂ gauge pressure, any positive-pressure transient in the process environment — a pump start, a valve actuation, a temperature excursion in an adjacent vessel — can momentarily reverse the pressure differential across the vessel vent, draw atmospheric air through the N₂ supply check valve, and introduce oxygen and ambient moisture (typically 8,000 to 12,000 ppm H₂O at 50% relative humidity) into the vessel headspace. TEAl vapor at 80°C has a vapor pressure of approximately 1 mmHg, which is low but non-negligible; the vapor-phase TEAl in the headspace contacts incoming oxygen and ignites spontaneously. The resulting fire inside the closed dilution vessel pressurizes the headspace, stresses the vessel shell, and can cause a sudden catastrophic opening of the vessel (not technically a BLEVE in the classical sense, since TEAl is not a boiling liquid at operating temperature, but mechanically equivalent in terms of vessel fragment projection). The hexane carrier solvent — which constitutes 80 to 90 wt% of the vessel contents — is then released from the opened vessel as a hot aerosol that ignites on contact with the already-burning TEAl fire, producing a secondary hexane fireball. Hexane flash point is −22°C; the resulting pooled fire has the full calorific energy of the hexane inventory available.

Surface 2 — Moisture Content in Hexane Carrier Solvent Feed (Upward Attack)

The Karl Fischer coulometric moisture analyzer output for the hexane carrier solvent feed is displayed on a 200 px vertical DCS bar spanning 0 to 50 ppm H₂O. The pixel scale is 200 px ÷ 50 ppm = 4 px per ppm. At the actual moisture concentration of 24 ppm H₂O, the rendered pixel position is 24 × 4 = 96 px from the bottom of the bar. The adversarial perturbation shifts this pixel cluster downward by 93 px to position 3 px. The AI inference engine reads the moisture as 3 ÷ 4 = 0.75 ppm, reported as 0.8 ppm — well below the process specification of 2 ppm maximum moisture in hexane feed for TEAl catalyst service. The high-moisture alarm setpoint is 2 ppm; the displayed 0.8 ppm is 60% below the alarm setpoint and appears to indicate drier-than-specification hexane feed. The actual 24 ppm is 12× the alarm setpoint and is far above the 10 ppm threshold at which measurable ethane evolution from TEAl hydrolysis begins.

The Karl Fischer moisture analyzer for hexane solvent in a TEAl service is typically a slipstream coulometric instrument sampling at 1 to 5 mL/min, providing a 4–20 mA output that is displayed on the DCS bargraph. It is the only real-time moisture monitor in the hexane supply train; upstream molecular sieve drier performance is validated only during scheduled maintenance, typically quarterly, and between maintenance windows the Karl Fischer output is the sole basis for continuous moisture compliance. At 24 ppm H₂O in the hexane feed, the hydrolysis reaction with TEAl in the dilution vessel proceeds at a rate that generates approximately 0.63 mol of C₂H₆ per mol of H₂O consumed — or, at 24 ppm moisture in a 500 L hexane feed vessel, roughly 67 μmol/hr of ethane continuously entering the headspace. Over a 4-hour operating window without detection, this accumulation reaches concentrations in the vessel headspace that approach the ethane LEL of 3.0 vol% under compound N₂ blanket failure conditions (Surface 1). The AI system, observing a Karl Fischer output of 0.8 ppm, calculates that the hexane is 2.5× drier than specification — no moisture alarm, no solvent hold, no enhanced drier regeneration cycle.

Surface 3 — TEAl Concentration in Diluted Hexane Feed to Reactor (Upward Attack)

The TEAl concentration in the diluted hexane co-catalyst feed stream to the polymerization reactor is displayed on a 200 px vertical DCS bar spanning 0 to 25 wt%. The pixel scale is 200 px ÷ 25 wt% = 8 px per wt%. At the actual TEAl feed concentration of 22.8 wt%, the rendered pixel position is 22.8 × 8 = 182 px from the bottom of the bar. The adversarial perturbation shifts this pixel cluster downward by 92 px to position 90 px. The AI inference engine reads the concentration as 90 ÷ 8 = 11.25 wt%, reported as 11.2 wt% — within the design operating range of 10 to 15 wt% for TEAl in hexane for polyolefin co-catalyst service. The high-concentration alarm setpoint is 15 wt%; the displayed 11.2 wt% is 25% below the alarm setpoint. The actual 22.8 wt% is 52% above the maximum safe handling concentration of 15 wt% for aluminum trialkyl solutions in hydrocarbon diluent as established in CCPS reactive chemical guidelines, and 14% above the upper limit of the DCS display range itself — meaning the adversarial pixel not only falsifies the value but places it at the very top of the display bar, which the perturbation shifts to mid-range to suppress the obvious over-range indication.

The consequence of a 22.8 wt% TEAl feed reaching the Ziegler-Natta polymerization reactor is concentration-dependent catalyst activation overload. At the design TEAl:Ti molar ratio of 50 to 300:1, the TiCl₄/MgCl₂ catalyst precursor achieves controlled activation with a predictable propagation rate at reactor temperature (typically 60 to 80°C for bulk polypropylene in the Spheripol loop reactor). At the TEAl:Ti ratios produced by a 22.8 wt% feed — approximately 2× the design TEAl delivery per unit TiCl₄ — the catalyst activation is over-driven, producing excessive active site density and a corresponding spike in the local heat of polymerization. The heat of polymerization for propylene is approximately 83 kJ/mol; ethylene approximately 94 kJ/mol. An activation overload that doubles the effective catalyst activity at the injection point generates a localized hotspot in the catalyst bed or loop reactor that the jacket cooling system — sized for the design heat generation rate — cannot remove fast enough. The hotspot produces a reactor temperature excursion, triggering pressure increase from volatile hexane carrier, and in a worst case, actuates the reactor pressure relief system, venting hexane-rich polymerization slurry to the flare or pressure relief header.

Integrating Glyphward into TEAl Ziegler-Natta Polyolefin AI Monitoring Pipelines

The following Python snippet shows how to authenticate every DCS display frame from a TEAl co-catalyst handling and catalyst activation system against the Glyphward API before passing it to a downstream process-safety LLM. Three context labels map to the three attack surfaces. A non-clean verdict raises a typed exception that the process control layer catches and routes to the plant's Safety Instrumented System (SIS) — initiating N₂ emergency purge, TEAl feed isolation, hexane solvent hold, and catalyst room personnel clearance — all of which must occur before TEAl vapor contacts any oxygen source, not after a vessel fire has already created secondary hexane pool fire conditions.

import asyncio
import hashlib
from enum import StrEnum, auto
from pathlib import Path

import httpx

GLYPHWARD_API = "https://api.glyphward.com/v1/scan"
GLYPHWARD_KEY = "gw_live_..."   # set via env var GLYPHWARD_API_KEY
TEAL_GLYPHWARD_THRESHOLD = 44

class TEAlContext(StrEnum):
    N2_BLANKET_PRESSURE      = auto()   # Surface 1 — upward attack (0.07 bar shown as 0.48 bar)
    CARRIER_MOISTURE_CONTENT = auto()   # Surface 2 — upward attack (24 ppm shown as 0.8 ppm)
    TEAL_CONCENTRATION_FEED  = auto()   # Surface 3 — upward attack (22.8 wt% shown as 11.2 wt%)

class AdversarialTEAlImageError(RuntimeError):
    def __init__(self, surface: TEAlContext, score: int, frame_hash: str):
        super().__init__(
            f"[Glyphward] TEAl adversarial pixel detected on {surface.value}: "
            f"score={score} >= threshold={TEAL_GLYPHWARD_THRESHOLD} "
            f"| frame={frame_hash}"
        )
        self.surface = surface
        self.score = score
        self.frame_hash = frame_hash

async def verify_teal_frame(
    frame_path: Path,
    surface: TEAlContext,
) -> dict:
    raw = frame_path.read_bytes()
    frame_hash = hashlib.sha256(raw).hexdigest()

    async with httpx.AsyncClient(timeout=4.0) as client:
        resp = await client.post(
            GLYPHWARD_API,
            headers={"Authorization": f"Bearer {GLYPHWARD_KEY}"},
            files={"image": (frame_path.name, raw, "image/png")},
            data={
                "context": surface.value,
                "threshold": TEAL_GLYPHWARD_THRESHOLD,
            },
        )
        resp.raise_for_status()
        result = resp.json()

    if result["verdict"] != "clean":
        raise AdversarialTEAlImageError(surface, result["score"], frame_hash)

    return {"verdict": result["verdict"], "score": result["score"], "hash": frame_hash}

async def safe_teal_catalyst_read(frame_dir: Path) -> list[dict]:
    surfaces = [
        (TEAlContext.N2_BLANKET_PRESSURE,
         frame_dir / "n2_blanket_pressure.png"),
        (TEAlContext.CARRIER_MOISTURE_CONTENT,
         frame_dir / "hexane_moisture_karl_fischer.png"),
        (TEAlContext.TEAL_CONCENTRATION_FEED,
         frame_dir / "teal_concentration_feed.png"),
    ]
    tasks = [verify_teal_frame(path, ctx) for ctx, path in surfaces]
    return await asyncio.gather(*tasks)

All three surface verification calls execute concurrently, adding under 80 ms of total overhead on a standard catalyst system historian polling cycle. The N₂ blanket pressure check runs simultaneously with the moisture and concentration checks — a critical design requirement because the most dangerous scenario is the compound attack in which both the N₂ blanket (Surface 1) and the moisture monitor (Surface 2) are falsified simultaneously, creating conditions for both TEAl vapor ignition and ethane explosive atmosphere in the same vessel headspace while the AI safety monitor observes a clean blanket pressure, clean moisture reading, and (independently) a falsified but apparently normal co-catalyst concentration. Each exception carries the SHA-256 frame hash, providing forensic traceability for OSHA PSM incident investigation requirements under 29 CFR 1910.119(m) and supporting CCPS incident database entries consistent with the documented record of TEAl handling fires at polyolefin facilities worldwide.