What are the strict purity and poison control requirements of DMT for CHDM synthesis?

CHDM production utilizes sensitive noble metal or copper hydrogenation catalysts. Hydrogenation-grade DMT requires strict control over catalyst poisons: sulfur (S) and chlorine (Cl) at sub-ppm to low ppm levels, minimal ash/heavy metals, controlled isomer profile (such as dimethyl isophthalate), and high purity (≥99.95%) with low acid value and moisture.

Why is DMT preferred over PTA for commercial CHDM and PETG production?

The two-step hydrogenation process (DMT hydrogenation to DMCD, followed by ester group hydrogenation to CHDM) operates under milder conditions than PTA direct hydrogenation. DMT offers superior solubility in hydrogenation solvents, higher catalyst lifetime, fewer side reactions, and enables quantitative methanol recovery.

How does Demeto support qualification of DMT for CHDM and PETG copolyester?

Demeto provides specialized hydrogenation-grade DMT benchmarking, laboratory catalyst poisoning tolerance tests, pilot-scale lot supply, and full-spectrum COA verification including sulfur and halogen testing to secure uninterrupted commercial production.

CHDM / PETG

Dimethyl terephthalate (DMT) for CHDM and PETG

DMT feedstock for demanding synthesis routes. High-consequence applications benefit from a staged qualification plan linking feedstock evidence to process and product outcomes. Compare test methods and catalyst-sensitive impurities before the trial, then connect sample, pilot and commercial-lot records through one documented release path.

OVERVIEW

Build a defensible qualification

Start with the critical quality attributes, then confirm them through samples and batch data.

PURITY

Define the useful purity window

Set limits that reflect the synthesis route and downstream product requirements.

COLOR

Protect optical performance

Evaluate color together with organic trace impurities and thermal history.

METALS

Review catalyst-sensitive traces

Align ash and metal controls with catalyst and process sensitivity.

SCALE-UP

Qualify progressively

Move from sample to pilot lot with agreed release documents and acceptance rules.

PROJECT CHECKLIST

What to confirm

Application-specific specificationRepresentative and lot-specific COASample and pilot qualificationDocumented change control for recurring supply

RELATED ACTIONS

Continue the qualification

NEXT STEPQuote factorsPrepare grade, package, volume and destination before requesting a current quote.NEXT STEPSamples & small packsReview the trial purpose, batch documents and availability before planning a test.NEXT STEPDownloadable toolsUse the procurement workbook, buyer guide and document-review checklist.NEXT STEPSubmit a structured RFQShare the application, critical limits, volume, packaging, destination and required documents.

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Turn your requirements into a reviewable supply plan

Share your application, target specification, volume and destination — we’ll confirm the next practical step and the available COA or sample basis.

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