Epichlorohydrin (ECH) is identified by CAS 106-89-8, UN 2023, Class 6.1, Packing Group II, a closed-cup flash point of 31 °C by ASTM D56, a boiling range of 115–117 °C, density of 1.180–1.183 g/cm³ at 20 °C, and a lower flammable limit of 3.8 vol% in air. The product is manufactured by the saponification of dichloropropanols derived from propylene or glycerol. In export supply chains, the phrase “Epichlorohydrin Producer & Exporter Dual Capability: Who Holds the DG Export Licence” describes a legal boundary that is often misread. The entity holding the dangerous goods export licence is the exporter of record named in the customs export declaration, not the production asset, the tank farm, or the process control room. Where a producing legal entity also files the export declaration and signs the dangerous goods transport document, the production company holds the DG export licence. Where a trading subsidiary or an export agent files the declaration, that trading subsidiary or agent holds the licence, even if the producer’s name appears on the safety data sheet and the packing certificate.

Regulatory and Hazard Classification Boundaries for Exporting ECH

Under ADR and the IMDG Code, ECH is consigned as UN 2023, Epichlorohydrin, Class 6.1, Packing Group II. The transport document must contain the information required by ADR 5.4.1 or IMDG Code 5.4.3, including the consignor’s identification, UN number, proper shipping name, class, packing group, quantity, and emergency contact reference. The container/vehicle packing certificate is required by ADR 5.4.2 and IMDG Code 5.4.2. The shipper’s declaration for air transport under IATA DGR 8.1.6 specifies the same UN number and class. The DG export licence, where mandated by a national competent authority, is issued to the legal exporter that appears in the export customs declaration and that accepts responsibility for these modal documents. The licence is not an intrinsic property of the production permit. A plant may hold a hazardous chemical production permit and still sell ex-works to a licensed exporter.

Production integration at dual-capability sites typically follows either the propylene route or the glycerol route. The propylene route chlorinates propylene to allyl chloride, then hypochlorinates to an intermediate mixture of 1,2-dichloro-3-propanol and 1,3-dichloro-2-propanol, and dehydrochlorinates with caustic soda to distilled ECH. The glycerol route reacts glycerol with hydrogen chloride at 110–120 °C using an acetic acid catalyst, then saponifies the resulting dichloropropanols. Both routes require caustic, steam, and a vacuum distillation train. Commercial export specification sets ECH purity at ≥99.9 wt% by gas chromatography with flame ionization detection, water at ≤0.05 wt% by Karl Fischer titration, color at ≤10 Pt-Co, and density at 1.180–1.183 g/cm³ at 20 °C. Elevated acidity accelerates ring-opening oligomerization in storage tanks and transport containers, so acidity is controlled as HCl at ≤0.005 wt%.

Does the Exporter of Record Retain the Dangerous Goods Export Licence?

At a dual-capability source, the exporter of record retains the DG export licence because the licence is attached to the legal entity that declares the goods for export and assumes liability for classification, packaging, marking, and documentation. The producer, as consignor under ADR or shipper under IMDG, may perform the physical stuffing and may issue the packing certificate, but if the export declaration is filed in the name of a separate trading company, the trading company’s licence code is the one that customs and port authority systems validate. This separation occurs frequently in toll manufacturing arrangements: the plant operator produces ECH under a processing agreement, stores the product in registered tanks, and loads the container, but the toller does not become the exporter unless the toller’s legal name appears on the export declaration and transport document. Conversely, when the producing entity sells CIF or DAP under its own name, the producing entity is the exporter of record and holds the DG export licence. The phrase “producer & exporter dual capability” therefore does not mean a single legal entity by default; it means the supply chain has an actor capable of performing both functions, but the licence holding depends on the customs filing and the contract of carriage.

Loading operations at dual-capability sites use PTFE-lined stainless steel or phenolic-lined carbon steel storage tanks to limit iron chloride contamination. Transfer pumps are PTFE-lined diaphragm or canned motor pumps with mechanical seals compatible with chlorinated organics. Hoses are conductive PTFE-lined stainless steel braid, electrically bonded, and pressure-tested before each campaign. ISO tank containers are inspected to ISO 1496-3 and may be dedicated to ECH service because the product hydrolyses with water and polymerizes with residual caustic. Nitrogen padding is applied to maintain the headspace below the lower flammable limit of 3.8 vol%; the product is loaded below 40 °C because the closed-cup flash point is 31 °C and vapor pressure at 20 °C is 1.6 kPa. A vapor detector with an alarm setpoint of 0.5 ppm, consistent with the ACGIH TLV-TWA, is installed at drum filling and tank container loading bays. Exposure above 0.5 ppm requires supplied-air respiratory protection and shutdown of transfer pumps. Published data for specific fouling rates in reboiler circuits is limited; however, production records show that caustic carryover and iron chloride contamination shorten rectification column run length by promoting oligomer formation, a known operational boundary for continuous trains.

When Production and Export Capability Merge at a Single Facility

When the production entity and exporter are the same legal person, the dual-capability operator holds the DG export licence, the dangerous goods transport document, and the packing certificate under a single registration. The single entity must nonetheless separate the production unit’s process safety management from the export unit’s dangerous goods compliance function. The production unit is responsible for preventing pH excursions above 9 in the rectification feed and for maintaining the vacuum distillation system. The export unit is responsible for verifying that the UN 2023 classification, Packing Group II assignment, and Section 14 transport information reflect the actual batch specification. The DGSA appointed under ADR 1.8.3 is an officer of the exporting legal entity; the DGSA’s annual report covers both the transport unit and any loading site under the same legal name. If the site operates multiple production trains and one train produces off-spec ECH with water above 0.05 wt%, the export unit must segregate the batch, reclassify if necessary, and issue a revised SDS Section 14 before shipping.

DGSA Appointment, Packing Verification, and Modal Segregation Duties

Under ADR 1.8.3, the exporting legal entity that holds the DG export licence must appoint a dangerous goods safety adviser for the carriage of ECH by road, rail, and inland waterway. The DGSA verifies that the annual transport report includes ECH movements, that the transport document contains the emergency telephone number required by ADR 5.4.3.4, and that drivers hold ADR training certificates under ADR 8.2. For maritime shipments, the exporter must complete the container/vehicle packing certificate and confirm that the container is structurally serviceable under ISO 1496-3, that the tank container is not interlining with incompatible residues, and that the cargo is segregated from acids, alkalis, amines, and oxidizing agents. At dual-capability sites, the logistics department may hold the exporter’s declaration signature authority while the plant shift supervisor controls the loading permit. This separation is required because the loading permit is an operational process safety control, whereas the export licence is a legal transport authorization. The DG export licence holder must be able to demonstrate to port state control authorities that the batch loaded matches the SDS Section 14 classification and that the tank container inspection certificate is valid for the shipment date.

Three common configurations exist. In the first, the producer files the export declaration itself; the producer holds the DG export licence. In the second, the producer sells ex-works to a trading company that files the export declaration; the trading company holds the licence, and the producer’s packing certificate lists the trading company as shipper. In the third, a parent company holds the production permit and a subsidiary holds the export licence; the subsidiary’s legal name must appear on the dangerous goods transport document. Border inspections compare the licence code to the exporter of record in the electronic customs declaration. Mismatches delay the shipment and may trigger additional inspections under IMDG Code Part 7 or national dangerous goods ordinances. The product remains the same; the licence holder is a function of the customs filing, not of the reactor or distillation technology.