{"schema_version":1,"experiment_id":"eoa_inverse_innovation_exp09_archetype_breadth150_20260804","cell_id":"catalytic_pathway_enablement__chemistry_materials","arm":"BREADTH_PROBE_ONE_SHOT","candidate_id":"catalytic_pathway_enablement__chemistry_materials__P1","proposal_index":1,"version":0,"title":"Regenerable Catalyst Cartridge for Selective Polyester Recovery from PET–Cotton Textiles","problem":"PET–cotton textile flakes can in principle be separated by converting the polyester into recoverable ester products, but PET alcoholysis within a cotton-preserving temperature and residence-time window is slow. Raising temperature, extending exposure, or adding freely dispersed catalyst can increase conversion while also increasing cellulose damage, dye-derived side products, catalyst carryover, or separation burden. The recurring problem is therefore a selective kinetic barrier, not an unidentified endpoint: accelerate PET bond cleavage while leaving the cotton fraction and acceptance criteria intact.","actors":["Textile-recycling process chemist","Materials characterization analyst","Reactor operator","Process-safety officer","Recovered-product quality owner","Catalyst steward"],"observable_state":"For feed lots meeting a declared PET–cotton composition and contaminant specification, blank structured packing operated at a fixed glycol ratio and cotton-preserving temperature leaves measurable residual PET after the allowed residence time. More severe conditions coincide with measurable cellulose molecular-weight loss, fiber-strength loss, discoloration, or additional soluble byproducts. Feed contaminants, catalyst activity, liquor composition, conversion, cotton integrity, and downstream separation load can all be sampled.","consequence":"The recycler must accept incomplete polyester recovery, long batch occupancy, or harsher processing that reduces the value of the retained cotton and complicates purification of the polyester-derived stream.","affected_objective":"Recover a specification-compliant polyester-derived chemical stream from eligible PET–cotton blends while preserving the cotton fraction, controlling contaminants and byproducts, and remaining within process-safety and downstream purification limits.","intervention":"Install a removable structured cartridge bearing an immobilized transesterification catalyst in a recirculating glycolysis reactor. Admit only characterized, prewashed PET–cotton flakes; hold glycol ratio, temperature, flow, and residence time inside a predeclared envelope; and compare the cartridge with chemically inert packing under matched conditions. After each batch, release products, rinse the cartridge, test retained activity and leaching, and return it to service only if it passes regeneration criteria. Meter feed to measured active capacity, screen incoming lots for catalyst poisons, track PET conversion together with cotton integrity and non-target products, and deactivate the pathway if selectivity, catalyst containment, or downstream load leaves its operating envelope.","structural_mapping":[{"archetype_element":"Target Transformation Specification","domain_realization":"Eligible PET in characterized PET–cotton flakes becomes a recoverable ester monomer or defined oligomer stream while the cotton fraction remains within predeclared molecular-integrity and mechanical-quality limits."},{"archetype_element":"Activation Barrier Model","domain_realization":"PET ester exchange is too slow at the temperature and contact time selected to protect cellulose; greater thermal severity opens unwanted degradation pathways."},{"archetype_element":"Permitted Pathway Boundary","domain_realization":"Acceleration may change reaction rate and pathway selectivity but may not relax cotton-quality, catalyst-leaching, product-purity, emissions, waste-handling, or reactor-safety criteria."},{"archetype_element":"Reusable Facilitator","domain_realization":"A chemically immobilized transesterification catalyst on removable structured packing remains separable from product and is conditionally reusable across textile batches."},{"archetype_element":"Facilitator–Substrate Interface","domain_realization":"Recirculating glycol wets standardized textile flakes and repeatedly carries reactants and soluble intermediates across the cartridge surface under controlled flow and residence time."},{"archetype_element":"Selectivity Rule","domain_realization":"Useful turnover requires PET-derived product formation without exceeding limits for cellulose depolymerization, dye decomposition, non-target solubilization, catalyst leaching, or unidentified byproducts."},{"archetype_element":"Facilitator Regeneration Cycle","domain_realization":"Drain, rinse, inspect, and recondition the cartridge after each batch; assay retained activity and leaching before release for another cycle."},{"archetype_element":"Turnover Capacity Model","domain_realization":"Track polyester converted per cartridge active mass, batch cycle time, conversion across successive uses, pressure drop, regeneration downtime, and decline in activity or selectivity."},{"archetype_element":"Saturation and Interference Monitor","domain_realization":"Track substrate loading, circulation rate, pressure drop, surface fouling, liquor composition, and conversion trajectory to detect overloaded or obstructed catalytic capacity."},{"archetype_element":"Inhibitor or Poison Monitor","domain_realization":"Screen feed and spent liquor for finishes, metals, pigments, soil, or degradation products associated with reversible inhibition, fouling, or persistent catalyst deactivation."},{"archetype_element":"Byproduct and Side-Pathway Guardrail","domain_realization":"Measure cotton integrity, soluble carbohydrate products, color bodies, unidentified chromatographic peaks, catalyst leaching, and purification load alongside target polyester conversion."},{"archetype_element":"Equilibrium Neutrality Check","domain_realization":"Compare extended matched runs to test whether the cartridge changes only the approach rate and product distribution within the observation window rather than being credited with creating an otherwise infeasible endpoint."},{"archetype_element":"Accountable Catalyst Steward","domain_realization":"A named process chemist owns cartridge identity, cycle history, activity release, regeneration records, contaminant incidents, and retirement decisions."}],"mechanism_mapping":[{"mechanism_slug":"heterogeneous_catalyst_bed","role":"Immobilizes catalytic sites at a removable flow interface so many substrate batches can contact the facilitator while catalyst recovery remains distinct from product recovery.","counterfactual_removal":"Without the active cartridge, matched inert packing should not produce the same rate trajectory at identical bulk inputs; if it does, the cartridge is not the operative facilitator."},{"mechanism_slug":"turnover_and_selectivity_assay","role":"Jointly measures PET conversion, product distribution, cotton preservation, catalyst leaching, and retained activity over successive cartridge cycles.","counterfactual_removal":"Without the assay, apparent throughput could result from cotton degradation, catalyst consumption, easier feed, or declining product quality rather than selective catalytic turnover."},{"mechanism_slug":"inhibitor_and_poison_screen","role":"Separates loss of activity caused by feed contaminants or fouling from insufficient substrate, residence time, or catalyst quantity.","counterfactual_removal":"Without contaminant screening, operators could respond to poisoning by increasing feed or severity, worsening queues and side reactions."},{"mechanism_slug":"catalyst_regeneration_protocol","role":"Restores the cartridge through controlled draining, rinsing, reconditioning, inspection, and activity qualification between batches.","counterfactual_removal":"Without regeneration and requalification, the facilitator would progressively foul or deactivate and would not support a credible reusable-cycle claim."},{"mechanism_slug":"small_safe_to_fail_probe","role":"Tests catalytic acceleration, selectivity, containment, and multi-cycle recovery in bounded bench reactors before any process installation.","counterfactual_removal":"Without a bounded probe, scale-up would expose larger material inventories and downstream systems before the pathway and its failure modes were characterized."}],"causal_chain":["Eligible PET–cotton feed is characterized and prewashed, reducing incompatible substrates and candidate poisons.","The fixed mild operating window preserves cotton but leaves PET alcoholysis kinetically constrained in the inert-packing baseline.","Recirculation repeatedly brings PET surfaces, glycol, and soluble intermediates into contact with immobilized catalytic sites.","The cartridge supplies a lower-barrier transesterification pathway without being intentionally incorporated into the recovered products.","Faster release of PET-derived soluble products frees catalytic sites for additional turnovers within the batch.","Feed loading and flow are limited to measured active capacity, preventing saturation or pressure-driven bypass.","Conversion, cotton integrity, byproducts, leaching, and downstream purification load are evaluated together, preventing raw rate from substituting for selectivity.","Post-batch regeneration and qualification return an acceptable cartridge to service; failed cartridges are isolated and retired.","Repeated matched cycles determine whether acceleration persists without proportional catalyst consumption or weakened material standards."],"baseline":"Matched bench batches use the same characterized textile feed, glycol ratio, reactor geometry, temperature profile, circulation, and residence time but substitute inert structured packing for the active cartridge. Record conversion-time curves, product distribution, cotton integrity, energy and solvent inputs, pressure drop, and purification burden. A secondary operational baseline is the existing severity-based route, evaluated without assuming that higher conversion compensates for fiber damage or added inputs.","nearest_rivals":["A homogeneous transesterification catalyst added to each batch, which may accelerate conversion but travels with the product stream and requires catalyst recovery, neutralization, or replenishment rather than cartridge turnover.","Higher temperature or longer residence time, which supplies bulk severity to every batch and may increase non-target cellulose and dye reactions rather than selectively lowering one pathway barrier.","Mechanical sorting or selective dissolution that separates polymer fractions without catalytically converting PET into the specified chemical feedstock.","An immobilized hydrolytic biocatalyst route, which would be a direct catalytic rival and should be compared on compatible feed range, product specification, turnover, inhibition, regeneration, and cotton preservation."],"remaining_contrastive_claim":"If matched tests show a repeatable rate change across multiple qualified cartridge cycles while catalyst containment, cotton integrity, product criteria, and bulk inputs remain fixed, the intervention is specifically a reusable selective pathway facilitator. It is not merely additional heat, longer processing, a catalyst consumed with each batch, or a relaxation of recovery standards.","authority_safety":{"decision_authority":"The laboratory process owner may authorize the bounded probe only with process-safety approval; the recovered-product quality owner sets non-waivable cotton, product, and leaching criteria. Any pilot-scale installation requires a separate decision outside this candidate's first step.","authorized_first_step":"Run paired, sealed bench-reactor tests on small, composition-verified textile portions using one active cartridge and one inert cartridge, followed by two additional active-cartridge reuse cycles after the prescribed regeneration and qualification checks.","excluded_actions":["Pilot or production scale-up","Use of uncharacterized post-consumer feed","Increasing temperature, pressure, solvent inventory, or catalyst loading outside the approved bench envelope","Relaxing cotton-integrity, product-purity, catalyst-leaching, or waste-handling limits to obtain apparent success","Discharging reaction liquor or recovered solids outside approved laboratory waste procedures","Returning a cartridge to service after a failed activity, containment, or physical-integrity check"],"halt_rollback":"Stop heating and circulation, cool and isolate the reactor, retain each material stream for characterization and approved disposal, and quarantine the cartridge if pressure, temperature, leaching, cotton-damage, or byproduct limits are breached. Because the cartridge is removable and tests are batch-contained, rollback is removal of the cartridge and restoration of the inert-packing baseline; no affected material is released as product."},"negative_tests":{"strongest_counterevidence":"At fixed bulk inputs, inert packing produces the same conversion-time and selectivity profile as the active cartridge, or any apparent advantage disappears after controlling for feed composition, catalyst leaching, added reagents, and cotton loss.","problem_falsifier":"The problem is not a kinetic barrier if the uncatalyzed mild route already reaches the required PET conversion within the allowed residence time, if cotton damage is unrelated to processing severity, or if the dominant limitation is feed identification, collection, product viability, or downstream separation rather than reaction rate.","intervention_falsifier":"The cartridge fails if it does not produce a repeatable matched acceleration, if activity cannot be restored across the bounded reuse cycles, if catalyst is consumed or leached in proportion to product, or if improved conversion requires breaching cotton-integrity, byproduct, safety, or downstream-load limits.","risks":["Catalyst leaching creates false heterogeneous turnover and contaminates recovered products.","Textile finishes, pigments, metals, or soil inhibit or poison active sites.","Fouling and channeling hide loss of accessible catalytic area.","Acceleration favors soluble colored products, cellulose cleavage, or other non-target pathways.","Feed-readiness rules exclude difficult waste streams and bias apparent performance.","Regeneration consumes solvent, energy, or maintenance capacity that erases the claimed reuse advantage.","A central cartridge becomes a throughput bottleneck or common-mode failure.","Faster depolymerization overloads monomer purification, solvent recovery, or waste treatment.","Bench-scale mass transfer does not represent larger reactor geometry.","Pressure, hot glycol, or reactive catalyst handling creates operator and equipment hazards."]},"next_evidence_step":"Pre-register the feed specification, operating envelope, analytical methods, acceptance limits, and comparison logic; then conduct the paired inert-versus-active bench run plus two regenerated reuse cycles. Measure time-resolved PET conversion, specified ester products, cotton mass and molecular/mechanical integrity, non-target soluble products, catalyst leaching, pressure drop, material and energy inputs, and post-regeneration activity. The step ends with a go/no-go review and does not authorize scale-up.","prior_art_status":"UNSEARCHED","diversity_from_prior_proposals":"Not assessed against other proposals because runtime isolation prohibits inspecting them; this candidate is independently derived as a literal chemistry-and-materials implementation centered on selective PET conversion, immobilized facilitator turnover, poisoning control, and cartridge regeneration.","revision_record":{"parent_version":null,"progress_targets_addressed":[],"conceptual_changes":[],"operational_changes":[],"evidence_changes":[],"claim_changes":[]}}