Cyclohexanone, CAS 108-94-1, is transported as a flammable liquid under UN 1915, Class 3, Packing Group III. The cyclic ketone has a normal boiling point of 155.6 °C at 101.325 kPa, a closed-cup flash point of 44 °C, a density of 0.947 g/cm³ at 20 °C, and a dynamic viscosity near 2.2 mPa·s at 20 °C. Export specifications typically define assay, water, acidity, color, and distillation range because the product feeds oxidation or oximation units where impurities shift catalytic selectivity and polymer chain build. Procurement documents therefore pair product quality limits with shipment and payment structure, particularly for drummed full container loads and ISO tank movements.

What Determines Cyclohexanone MOQ in Bulk Export Contracts?

Standard drummed packaging consists of 190 kg net, tight-head steel drums with an internal phenolic or epoxy-phenolic lining. A 20 ft dry container loaded without pallets commonly accommodates 80 drums, or 15.2 t net. The Cyclohexanone MOQ for this mode is therefore one 20 ft FCL, because less-than-container-load movements impose dangerous-goods consolidation restrictions and higher per-kilogram freight. Where pallets are required, the load is reduced to 16 drums per pallet and 12–14 pallets per container depending on stacking limits; net payload may fall to 12.7–14.4 t.

ISO tank contracts typically set Cyclohexanone MOQ at one 20,000–24,000 L capacity tank, equal to 18.9–22.7 t at 20 °C. The lower end of the range is used when the carrier imposes an 80% maximum fill on UN 1915 liquids for surge capacity. Buyers requesting multiple lots from a single production campaign should state that requirement in the inquiry, because a continuous dehydrogenation unit may need to blend 2–3 reactor batches to fill one ISO tank without breaking certificate of analysis traceability. Batch-to-batch assay variation of 0.05–0.15% in cyclohexanol content is typical across a campaign; buyers without a single-lot export may receive drum lots that differ enough to affect oximation stoichiometry.

Two main production routes are present in export markets. Phenol hydrogenation followed by cyclohexanol dehydrogenation produces a high-purity ketone but may leave trace phenol and aromatic saturation by-products. Cyclohexane liquid-phase air oxidation routes yield KA oil with cyclohexanone and cyclohexanol, requiring distillation and caustic washing to separate ketone from acid ester by-products. Purchase specifications should therefore identify the production route or request impurity data because two 99.9% assay lots may differ in downstream behavior if one contains 0.01% total aromatic impurities and the other contains 0.01% residual hydrocarbons.

Commercial cyclohexanone sold into caprolactam oximation is commonly controlled by a certificate of analysis containing the profile shown below. The assay method must be gas chromatography; a non-polar methyl silicone column may overstate cyclohexanone purity because cyclohexanol and trace epoxide intermediates can co-elute. The purchase order should require a polyethylene glycol or equivalent polar column with retention-time confirmation.

Cyclohexanol content is a more sensitive control than total assay for oximation users because residual alcohol reduces conversion per unit mass and disturbs the ketone:alcohol ratio in recycled KA oil streams. Acidity is controlled at ≤0.01% because acidic impurities promote aldol condensation during storage, producing water and color bodies. A shore tank with heating coils must not exceed 30 °C during long-term storage, since open-loop heating accelerates oxidative yellowing.

FOB/CIF & Payment Terms Where Demurrage Exposure Is Concentrated

Under Incoterms 2020, FOB places carriage and freight costs on the buyer from the point the goods are on board at the named load port; risk transfers at that point. CIF includes contract of carriage and marine insurance to the named destination port, with risk still transferring at load port. The minimum insurance under CIF is 110% of invoice value on Institute Cargo Clauses (C), which does not cover leakage and contamination from tank wall residue. Buyers moving ISO tanks should request Institute Cargo Clauses (A) or equivalent all-risks cover, with documented survey at load and discharge.

Payment terms for first-time FOB/CIF transactions above USD 50,000 are commonly structured as irrevocable at-sight letter of credit confirmed by a bank in the exporter’s jurisdiction. Required documents include the commercial invoice, full set of clean on board bill of lading, certificate of analysis, certificate of quantity, packing list, and dangerous goods declaration. For established accounts, telegraphic transfer against copy shipping documents may be accepted with 30% advance and 70% before release of original B/L. Documents required under LC must not include ambiguous phrases such as “approximately” for quantity, because banks reject invoices above ±10% tolerance unless the credit states otherwise.

FOB/CIF & Payment Terms should allocate shore tank charges, nitrogen blanketing, sampling, and independent surveyor fees. In CIF ISO tank sales, the seller often includes freight and insurance but excludes discharge port demurrage; demurrage exposure is therefore concentrated at the receiving terminal, where available slots and wall-wash analysis can extend unloading. For small drum lots below one FCL, sellers often require 100% telegraphic transfer before release due to high fixed bank handling charges. Currency for FOB/CIF & Payment Terms is usually USD for bulk solvent exports from Asia; euro-denominated CIF contracts are also used for intra-Europe shipments.

When ISO Tank Loading Exceeds Drummed FCL Precision Limits

ISO tank operations require a nitrogen-padded top loading with a deep-tube dip pipe. Vent vapors are routed to a scrubber or thermal oxidizer. Transfer pumps should be 316L stainless steel or PTFE-lined, with mechanical seals selected for ketone service; EPDM or PTFE-encapsulated gaskets are preferred over Buna-N or natural rubber, which swell and contaminate the product. The receiving tank should be dry and free of chloride residue if the previous cargo was chlorinated; wall-wash analysis should be attached to the tank certificate. Product temperature during transfer is normally maintained below 30 °C.

Cyclohexanone viscosity of approximately 2.2 mPa·s at 20 °C permits metered loading with positive-displacement or Coriolis flow meters. Static discharge is controlled by limiting liquid velocity to 7 m/s in nonconductive piping and by grounding the tank and pump skid. Loading time for a 24,000 L tank is commonly 6–10 hours when inerting, pressure testing, filling, sampling, and final certification are included. Drummed FCL operations, by contrast, use automated net-weight filling lines with ±0.5 kg tolerance per drum and closed-loop vapor extraction. Moisture ingress during drum filling is controlled by a nitrogen sweep in the filling head; drums are sealed with bungs and sampled through a septum port.

Cyclohexanone is rarely consumed as a finished product; its value is determined by behavior in downstream oxidation or hydrogenation chains. In caprolactam production, purified cyclohexanone is oximated with hydroxylamine sulfate under controlled pH, then rearranged to caprolactam in oleum. High assay and low cyclohexanol are necessary because residual alcohol and water reduce oximation efficiency and increase sulfate-removal load. In adipic acid production, a ketone-alcohol mixture from cyclohexane air oxidation is oxidized with nitric acid; the ketone-alcohol ratio in the KA oil strongly influences heat release and nitrous oxide generation, so cyclohexanone streams are blended to maintain a defined ratio rather than used as received. In solvent formulations for vinyl resins and nitrocellulose, cyclohexanone is blended at addition rates commonly between 10 wt% and 30 wt% of the total solvent phase, depending on drying profile and resin tolerance.

Safety and storage limits are concrete: store in closed, grounded tanks or drums away from oxidizers, strong acids, and ignition sources. Nitrogen blanket is preferred if water content must remain below 0.05%. Unlined carbon steel should be avoided for long-term storage because iron contributes oxidative discoloration. Copper and copper alloys are also inappropriate for product-contact service; trace copper accelerates oxidative yellowing. Do not add amine-based additives to control acidity because amines can initiate aldol condensation and increase color. Prolonged storage at elevated ambient temperature above 30 °C can increase acidity, so certificates of analysis should be revalidated after 90 days for material held in drums.

For FOB/CIF shipments, quantity is verified by independent surveyor before loading and after discharge. Shore tank measurements for ISO tanks and platform scale tickets for drums are accepted as documentary evidence. A buyer that requires ISO 9001:2015 terminal certification and ISO 17025 laboratory accreditation should state these requirements on the purchase order, because they are not automatic attachments to a bill of lading. For drummed cargo, a calibrated platform scale with ±0.5 kg graduation is used; cumulative container net weight is derived from the sum of individual drum weights, not from a single weighbridge measurement.