Technical explainer · plastic and tyre oil
A boiling range does not certify a fuel
Pyrolysis oil is an intermediate mixture. Refining starts with the origin and measured quality of that mixture, then works toward a named receiver's specification. Distillation separates boiling ranges; it does not automatically desulfurise, dechlorinate or qualify the product as diesel. This guide explains the decisions, rather than prescribing an equipment configuration.
Updated
The upstream feedstock travels into the oil
Plastic-derived oil
Record the polymer mix, additives, sorting rejects and contamination. PE/PP-rich waste can produce hydrocarbon mixtures, but its label alone does not establish cleanliness. Chlorinated material requires a chlorine investigation; organochlorine compounds in the oil matter to downstream processing. Changing suppliers or sorting performance calls for fresh sampling. [1][3]
Tyre-derived oil
Keep tyre oil separate in the test brief. Sulfur-containing compounds and a broad hydrocarbon mixture affect fraction selection and subsequent treatment. Published tyre-oil fractionation research found sulfur distributed between cuts, with concentration in heavier material—not complete sulfur removal. A plastic-oil test report cannot stand in for a tyre-oil batch. [2]
From the pyrolysis line to the distillation brief
Carry evidence between three decisions. A machine name or an oil colour cannot replace an oil analysis.
- 01
Define the upstream line
Record tyre or plastic feed, sorting, operating mode and batch identity. Keep oils from different sources traceable.
HandoffFeed and operating record - 02
Analyse the actual oil
Use a representative sample. Report water, solids, sulfur, chlorine, boiling range and stability, with methods and dates.
HandoffDated oil analysis and sampling record - 03
Specify the distillation route
Match the analysis and daily oil throughput to pretreatment, pressure, fraction cuts and residue handling. Compare each fraction with the buyer's written target specification.
HandoffWritten equipment scope and acceptance criteriaReview pyrolysis-oil distillation equipment
Feed, storage or target changes? Return to representative sampling before confirming the design.
Missing results stay open. Distillation separates fractions; it does not by itself certify fuel quality or guarantee sulfur/chlorine removal.
Connect each measurement to an engineering decision
| Quality question | Evidence to request | Consequence for the route |
|---|---|---|
| Water and suspended solids | Representative samples, water content and solids/filtration assessment; record tank and sampling conditions. | Define settling, dewatering and filtration before hot separation; account for separated water and solids. [1] |
| Sulfur and chlorine | Total sulfur and total chlorine with suitable methods and detection limits; speciation where the receiver or treatment study needs it. | Test feed and each intended cut. A lower result in one fraction is not proof that every fraction is acceptable. [2][3] |
| Boiling behaviour | A measured distillation curve, pressure basis, fraction masses and evidence of thermal instability. | Select cuts and assess atmospheric or vacuum service. Do not infer recovery from the name of the feedstock. [1] |
| Stability and handling | An agreed stability/storage assessment, flash point, viscosity and compatibility tests for any proposed blend. | Define storage, handling and any stabilisation trial; fresh appearance does not establish shelf life. [1][4] |
| Other receiver constraints | Acidity, nitrogen, oxygen, relevant metals and the receiver's complete test list, as appropriate to the feed and use. | Identify remaining treatment and acceptance gaps before quoting a finished-product grade. [1] |
Four distinct jobs in the refining route
Pretreatment
Remove separable water and particles using a validated conditioning plan. Filtration alone does not remove all dissolved contaminants. Retest the conditioned oil before defining the next stage. [1]
Further upgrading, if justified
Adsorption, hydrotreatment or other targeted chemistry may be studied for the remaining contaminants and unsaturation. Confirm feed compatibility, treatment effectiveness and waste routes by testing. These operations are not implied by the word distillation. [1]
Acceptance and release
Compare a representative final sample with the named receiver's limits and methods. Keep off-specification material segregated for a defined rework or disposal route; record the delivered batch, not just a promising laboratory fraction. [4]
The intended use changes the specification
Industrial fuel candidate
Agree burner compatibility, handling limits, contaminants and applicable site requirements with the operator. An industrial outlet is not automatic permission to burn untreated oil. [1]
Refinery or petrochemical intermediate
Use the receiving unit's feed specification, approved blend conditions and contaminant limits. Research on purified fractions demonstrates possible routes, not universal refinery acceptance. [1]
Finished transport fuel
A diesel-range boiling cut is not certified diesel. ASTM D975 illustrates a multi-property specification, including ignition quality, sulfur, viscosity and other requirements. Confirm the applicable standard edition, local rules and full test programme; one passing result is insufficient. [4]
Prepare an evidence-led refining brief
- Feedstock identity, supplier history and expected batch variability
- Representative crude-oil results with methods, dates and detection limits
- Receiver, intended use and written product acceptance specification
- Trial cut analyses and a complete material balance, including residues
- Capacity, utilities, storage and feasible routes for water, gases and spent treatment materials