Do not begin with a reactor model or a headline tons-per-day figure. Begin with representative plastic data, an operating calendar, defined product destinations and a site acceptance basis. Those inputs determine whether a batch or continuous line can be engineered and compared.
Technical scope reviewed: September 2026
What this guide decides - and what it does not
This guide owns the informational question waste plastic pyrolysis plant buying guide. It helps a project team prepare a defensible request for proposal. The linked product pages own commercial model selection; this page does not assign a model before the feed and site basis are known.
At process level, suitable prepared plastic is heated with controlled oxygen ingress. The project may recover condensable liquid, non-condensable gas and a carbonaceous solid. That description is not proof that every plastic is acceptable, that every output is saleable, that recovered gas will cover all heat demand, or that a plant is compliant at a particular site.
A useful buying decision therefore connects each promise to four things: the sampled feed envelope, the complete front-to-back process boundary, the intended product specification and a measurable acceptance test. If one is missing, the quotation is not yet comparable.
Eight gates before equipment selection
Resolve these gates in order. A vendor can help close evidence gaps, but an unverified assumption should remain visible in the design basis and contract.
| Decision gate | Buyer input | Why it changes the design | Evidence to request |
|---|---|---|---|
| Supply and variability | Monthly and annual available mass, seasonality, rejected loads and current disposal route. | Sets campaign size, storage, buffer capacity and realistic annual utilization. | Weighbridge records, supply contracts and a conservative supply case. |
| Polymer composition | Representative shares of PE, PP, PS, PET, PVC, halogenated, multilayer and unknown material. | Changes thermal behavior, corrosion risk, condensation and cleanup duties, and potential product routes. | A sampling plan, laboratory methods, results and a written acceptable-feed envelope. |
| Contaminants and additives | Moisture, dirt, metals, glass, ash, labels, fillers, flame retardants, chlorine and other halogens. | Affects heat duty, feeding, corrosion, gas treatment, liquid quality and residue handling. | Test frequency, analytical methods, contractual limits and a deviation procedure. |
| Physical form and preparation | Bales, film, rigid parts, flakes or agglomerate; size, bulk density, bridging behavior and storage condition. | Determines opening, sorting, shredding, drying, densifying and sealed-feed requirements. | A feed-preparation flow diagram, mass balance, utility list and representative material trial. |
| Operating calendar | Receiving hours, shifts, planned stops, cleaning, maintenance windows and annual production target. | Screens batch campaigns against continuous operation and prevents nameplate capacity from being mistaken for annual throughput. | A calendar-based capacity model with availability, staffing and shutdown assumptions. |
| Product destinations | Named user and specification for liquid, gas and solid streams, plus storage and off-spec routes. | Drives condensation, gas handling, solids treatment, testing, upgrading and storage scope. | Buyer specifications, test methods, sample or trial evidence and off-spec responsibility. |
| Site and compliance basis | Country, waste classification, plot, utilities, drainage, fire strategy, emissions duties and residue route. | Defines battery limits, monitoring, control layers, hazardous-area work and permitting inputs. | Site plan, utility basis, emissions basis, hazard review and confirmation from local authorities or advisers. |
| Contract acceptance | Throughput basis, stable-test duration, sampling points, tolerances, responsibilities and remedies. | Turns a reactor offer into a testable full-line commitment for the agreed feed envelope. | Signed protocol, calibrated instruments, mass-balance method, responsibility matrix and correction plan. |
Buyer-input worksheet
Send these twelve inputs with the first technical enquiry. Mark unknowns as unknown; do not replace them with optimistic estimates.
- Feed source, legal classification, ownership and current treatment route.
- Monthly and annual tonnage with low, expected and high cases.
- Sampling locations, dates, composite method and chain of custody.
- Polymer composition including mixed, multilayer and unknown fractions.
- Moisture, ash, chlorine or halogens, metals, inerts and relevant additives.
- Delivered form, particle size, bulk density, packaging and storage condition.
- Preparation steps already available and steps feasible at the proposed site.
- Receiving pattern, shifts, maintenance windows and required annual availability.
- Intended user, specification and test method for every output and off-spec route.
- Available electricity, fuel, water, cooling, nitrogen, drainage and storage.
- Local planning, waste, air, water, fire, occupational and transport approvals.
- Supply boundary, civil works, commissioning, training, warranty and acceptance duties.
Batch or continuous is a conditional decision
Neither mode is universally better. Compare the whole prepared-feed line and operating calendar, not an isolated reactor.
| Project condition | Batch route may fit when | Continuous route may fit when | Proof before selection |
|---|---|---|---|
| Campaign or intermittent arrivals | Material is accumulated in defined lots and stop-start labor and energy are acceptable. | Buffer storage can create a stable, long campaign. | Calendar model, storage plan and start-stop sequence. |
| Composition changes between lots | Lots can remain traceable and operating recipes can be reset between campaigns. | Sorting and blending can keep the feed inside a narrow validated envelope. | Lot records, blending logic and feed-acceptance limits. |
| Long stable campaigns | Planned cycles still meet the annual target with cleaning and cooling included. | Stable supply supports steady feeding and downstream operation. | Full-line availability and maintenance calculation. |
| Limited technical staffing | The site can safely staff repeated loading, unloading and start-stop work. | The site can support instrumentation, preventive maintenance and continuous supervision. | Role matrix, training plan, alarm philosophy and staffing per shift. |
| Tight product specification | Lots can be segregated and released separately. | Stable feed and controls can hold key variables within a validated range. | Product specification, sampling frequency and representative trial data. |
| Plot or permit constraints | Multiple vessels, handling zones and cycle emissions fit the approved layout. | Steady-state auxiliaries, storage and emergency systems fit the approved layout. | Plot plan, battery limits, emissions basis and hazard review. |
Compare quotations on the same boundary
First normalize the feed envelope, preparation steps, operating calendar and product specifications. Then separate the reactor from reception, sorting, size reduction, drying, sealed feeding, condensation, gas treatment, solids handling, utilities, storage, controls, civil work, commissioning and emissions monitoring.
Require a project mass and energy balance. Reference-project figures can be useful context, but the supplier should explain why the reference feed, measurement basis and process boundary are comparable to yours.
- Guaranteed throughput states moisture, contaminants, particle form and stable-test duration.
- Utilities state operating and peak demand, quality, pressure and who supplies each connection.
- Products state sampling point, analytical method, specification and off-spec destination.
- Emissions and residues state measurement point, control equipment and disposal responsibility.
- Controls state interlocks, trips, alarm priorities, safe state and loss-of-utility response.
- Acceptance states instruments, tolerances, exclusions, retest rules and contractual remedy.
Replace risky claims with testable statements
These replacements are intentionally conditional. Final values belong in project-specific engineering and acceptance documents.
| Risky shortcut | Evidence-based replacement |
|---|---|
| Handles all waste plastics. | Define a sampled acceptable-feed envelope, excluded materials, contaminant limits and the action for an out-of-spec load. |
| A fixed percentage of oil is guaranteed. | State liquid, gas and solid balances for a characterized feed, operating window and measurement method, with uncertainty and unaccounted loss. |
| Recovered gas makes the plant self-fuelling. | Model start-up, normal and upset heat demand against measured gas quantity and heating value; specify backup fuel and safe surplus-gas handling. |
| The solid is carbon black ready for sale. | Call it a carbonaceous solid until composition, contaminants, treatment, customer specification and legal market status are demonstrated. |
| Generic controls prove emissions performance and process safety. | Define emission points, control and monitoring duties, interlocks, relief and flare or equivalent arrangements, hazard review and operator procedures. |
Move from guide to a project basis
Use the worksheet before requesting a configuration. Product links explain the two commercial routes; the equipment hub gives the portfolio context. A technical enquiry should attach available feed evidence and explicitly list remaining unknowns.
- Review the continuous plastic pyrolysis route
- Review the batch plastic pyrolysis route
- See the pyrolysis equipment family
- Send the buyer-input worksheet
Institutional references
These references support waste characterization, process boundary, substances of concern, plant integrity and control-system questions. They do not certify a Pyrojin project or replace local permitting.
- Basel Convention: Technical guidelines for environmentally sound management of plastic wastes
- European Commission JRC: Waste Incineration BAT reference document
- European Commission JRC: Waste Treatment BAT reference document
- RIVM: substances of very high concern in plastic-waste pyrolysis oil
- UK HSE: plant and furnace design measures
- UK HSE: control-system safety measures
Editorial boundary: Pyrojin's technical editorial team reviewed this procurement framework. Feed acceptance, yields, emissions, utilities, products, safety functions and guarantees still require named-project engineering review and signed acceptance criteria.
