Cyclohexanone import duty by country is most accurately established under Harmonized System subheading 2914.22, not 2914.23. The phrase HS Code 2914.23 & Cyclohexanone Import Duty by Country persists in legacy trade documentation and third-party tariff aggregator data; however, six-digit code 2914.23 is reserved for ionones and methylionones, while 2914.22 covers cyclohexanone and methylcyclohexanones. Cyclohexanone, CAS 108-94-1 and EC 203-631-1, is a cyclic ketone with molecular formula C6H10O, molar mass 98.15 g/mol, boiling point 155.6 °C, closed-cup flash point 44 °C, and density 0.9478 g/cm³ at 20 °C when measured by ASTM D4052-22. Bulk product is transported under UN 1915, Class 3, Packing Group III. Automated customs selectivity in the United States, European Union, India, and Brazil flags mismatches when the commercial invoice specifies cyclohexanone but the submitted tariff line falls under 2914.23.

Commercial production routes include cyclohexane oxidation to a cyclohexanol/cyclohexanone mixture known as KA oil, followed by cyclohexanol dehydrogenation, and direct phenol hydrogenation. Merchant cyclohexanone is consumed in coatings, adhesives, solvent recovery, and chemical intermediates; integrated producers use a large fraction as a precursor to ε-caprolactam for nylon 6. Because the material is a flammable liquid and potential peroxide former, import and storage operations require a complete Safety Data Sheet, peroxide limits, and a national tariff classification ruling.

Solvent Strength, Storage Metallurgy, and Peroxide Formation Limits

Solvent-grade cyclohexanone is controlled for distillation range, water, acidity, and Pt-Co color. Distillation is measured by ASTM D1078-11, density by ASTM D4052-22, water by ASTM E203-16, and color by ASTM D1209-05. In moisture-sensitive polyurethane and vinyl chloride copolymer adhesive systems, water above 0.2 wt% can reduce storage stability, accelerate isocyanate side reactions, and produce visible film haze when coatings are applied with wire-wound drawdown bars under ASTM D823-18. Closed carbon steel tanks are used for bulk storage; copper and brass are excluded from solvent recovery circuits because trace peroxides formed by autoxidation may be catalyzed by transition metals. Bulk tanks are blanketed with dry nitrogen when ambient storage exceeds 35 °C or when headspace free volume is large.

Peroxides are not covered by a single ASTM method for cyclohexanone; terminal operators commonly use iodometric titration and limit peroxides to 50 mg/kg as hydrogen peroxide equivalents before distillation. Solvent-grade specifications often include water maximum 0.10 wt% to 0.20 wt%, acidity maximum 0.01 wt% as acetic acid, and Pt-Co color maximum 15 units. These limits reduce rust specking in steel drums and minimize batch-to-batch variation in downstream viscosity.

What Process Constraints Govern Caprolactam-Grade Cyclohexanone?

The largest industrial use of cyclohexanone is conversion to cyclohexanone oxime and then ε-caprolactam by Beckmann rearrangement. In the cyclohexane oxidation route, per-pass cyclohexane conversion is held near 4–6% to maintain selectivity to cyclohexanol and cyclohexanone. Operation is performed in a series of stirred gas-liquid reactors or bubble columns at 150–170 °C and 0.8–1.2 MPa using oxygen-depleted air. Above this temperature window, ring-opening and carboxylic acid byproducts increase; below it, conversion falls below economic utilization. The air oxidation section relies on recirculating reactor overflow and external heat exchangers to maintain temperature within a narrow band because the oxidation is exothermic and the reactor contents remain in the flammable region if the oxidant is not maintained below the limiting oxygen concentration.

KA oil is distilled, and cyclohexanol is dehydrogenated in a fixed-bed tubular reactor over a copper-zinc catalyst at 220–260 °C. Liquid hourly space velocity is commonly set between 0.4 h&supminus;¹ and 0.8 h&supminus;¹, but published data for specific licensor configurations is limited. Phenol hydrogenation is an alternative route using a supported palladium catalyst in a liquid-phase continuous reactor at 120–180 °C; this route generates lower aldehyde and acid levels but is sensitive to organic sulfur, iron, and water in the phenol feedstock. Caprolactam-grade cyclohexanone is specified at ≥99.8 wt% purity with controlled cyclohexanol, water, and acidity. Oxime color and downstream caprolactam UV absorbance can shift batch-to-batch when trace cyclohexene or unconverted cyclohexanol remains above specification. Integrated plants transfer the product through dedicated stainless-steel pipelines to oxime reactors; merchant material is shipped in lined steel drums or stainless-steel tank containers to limit iron contamination.

Cyclohexanone enters high-performance coatings as a slow-evaporating ketone tail solvent for vinyl chloride copolymers, acrylics, epoxies, and two-component polyurethanes. In polyvinyl chloride adhesive manufacturing, high-torque variable-speed dispersers equipped with Cowles blades are used to dissolve high-K-value resin; the resulting viscosity rise and reduction in undissolved particle count are checked with a Hegman gauge. The optimal cyclohexanone content is not fixed because it depends on resin K-value, plasticizer type, and application method. In coil coating lines using reverse-roll applicators, a cyclohexanone-rich tail solvent delays viscosity build-up during the run but increases oven demand if film retention is high. Water ingress above 0.2 wt% in two-component polyurethane systems accelerates isocyanate-water reaction; this is reflected as a progressive viscosity increase measured with a Brookfield viscometer calibrated to ISO 2555:2018. For polyvinyl chloride pipe cements, the solvent blend of cyclohexanone, methyl ethyl ketone, and acetone is adjusted to provide an open time of 30–120 seconds on porous substrates; published data for specific end-use formulations is limited.

Pharmaceutical and fine chemical process streams use cyclohexanone as an extractive solvent and as a carbonyl building block for enamine formation. In these applications, peroxides, water, and non-volatile residue are the main specification constraints. A wiped-film evaporator under reduced pressure is preferred over a simple pot still for recovery from reaction mixtures because the short residence time suppresses aldol condensation products. The recovered cut is controlled by refractive index and density, and the residue is monitored for viscosity increase that signals polymerized impurities. Before use in moisture-sensitive systems, solvent may be pre-dried with 3A molecular sieves when ambient relative humidity exceeds 60%.

Recovering Cyclohexanone from Coating and Adhesive Waste Solvates

Solvent recovery from waste coating or adhesive solvates is performed under vacuum to reduce reboiler temperature and limit autoxidation. A thin-film or wiped-film evaporator is used when the feed contains dissolved vinyl resin or polyurethane solids; residence time in the heated zone is minimized, and the residue is discharged through a positive-displacement gear pump or screw discharge. Atmospheric distillation of peroxide-bearing cyclohexanone is not recommended because peroxides can concentrate in the reboiler liquid inventory. Water overhead is separated, and the cyclohexanone-rich cut is returned to the process only after peroxide, acidity, and Pt-Co color acceptance tests. Iron contamination is controlled by using stainless-steel internals and excluding copper heating surfaces. The recovered solvent is tested by ASTM D1209-05 for Pt-Co color and ASTM E203-16 for water; peroxides are measured by iodometric titration. In many production batches, recovered cyclohexanone is limited to 20–30 wt% of the total ketone solvent demand to prevent accumulation of unidentified high-boiling impurities. Published data for specific recovery circuit designs across all resin chemistries is limited.

When HS Code 2914.23 Appears in Import Documentation Instead of 2914.22

Customs compliance for cyclohexanone requires six-digit Harmonized System subheading 2914.22, which covers cyclohexanone and methylcyclohexanones. The code 2914.23 is reserved for ionones and methylionones. The repeated appearance of HS Code 2914.23 in trade documents is commonly traced to legacy product master data, supplier invoice templates, or tariff-data aggregator mapping that does not align to national ten-digit lines. A binding tariff classification ruling from the destination customs authority remains the strongest defense against duty underpayment and post-release audit exposure. The table below summarizes representative cyclohexanone import duty by country for HS 2914.22 MFN rates in selected jurisdictions.

Applied rates are MFN positions and do not include anti-dumping, safeguard, or countervailing duties. Preferential certificates under regional trade agreements can reduce the rates shown. The use of incorrect six-digit code 2914.23 for cyclohexanone can trigger a different duty rate and a notice of action if the laboratory description conflicts with the invoice.

Regulatory classification and test methods used for pre-shipment conformance are consolidated below.

Pre-shipment inspection should include container cleanliness, closed-cup flash point documentation, and water content. The EU REACH registration requires exposure scenarios for downstream uses; a non-compliant Safety Data Sheet prevents import clearance in the European Economic Area. Retention samples are held in sealed glass or epoxy-lined steel containers for the audit period required by national customs law. When entry documentation references HS Code 2914.23 instead of 2914.22, importers correct the declaration through post-entry amendment before release if customs has not already rejected the entry.