2-Propanol, also designated isopropyl alcohol and propan-2-ol under CAS 67-63-0, is a clear, water-white, hygroscopic secondary alcohol with a closed-cup flash point of 12°C, a boiling point of 82.5°C at 101.3 kPa, a lower flammable limit of 2.0 vol%, an autoignition temperature of 399°C, a vapor pressure of 4.4 kPa at 20°C, and a density of 0.786 g/cm³ at 20°C. The commercial scope of this article is Isopropyl Alcohol Supplier in China: Grades, Packaging and Export Terms. Under the Harmonized System, the material is classified under 2905.12; dangerous goods regulations assign UN 1219, Class 3, Packaging Group II. A Chinese supplier’s certificate of analysis and packaging marking therefore operate under separate regulatory controls, and a shipment cleared as an industrial solvent cannot automatically be used as a pharmaceutical excipient.

What distinguishes a Chinese industrial-grade shipment from USP or electronic-grade material?

Chinese producers typically issue three families of grade designations: industrial solvent, pharmacopoeial/cosmetic, and low-water/electronic or reagent. The table below summarizes typical certificate-of-analysis values observed on export documentation; these values are indicative and must not be read as a specification without a lot-specific COA. ASTM D770 provides sampling and property test methods for industrial isopropyl alcohol, while USP-NF and Ph. Eur. monographs impose additional identity and purity tests for pharmaceutical excipient and sanitizer use. Electronic-grade material is not defined by a single ISO or SEMI specification in most export contracts; purchase orders instead specify internal limits for metals, particle count, and anionic residue.

2-Propanol is used as a process solvent for nitrocellulose, rosin ester, and shellac coatings. Hansen solubility parameters of δD = 15.8 MPa^0.5, δP = 6.1 MPa^0.5, and δH = 16.4 MPa^0.5 place the solvent within the polarity window for these resins but outside the true nonpolar solvent range for polyolefins. In pharmaceutical hygiene, the WHO-recommended hand-rub formulation contains 75% v/v 2-propanol, 0.125% v/v hydrogen peroxide, and 1.45% v/v glycerol. As a chemical intermediate, 2-propanol is dehydrogenated to acetone or esterified with acetic acid to isopropyl acetate; these conversions are mature continuous processes, but published data for specific Chinese tolling reactor conversion is limited because catalyst loadings and heat-transfer parameters are proprietary.

Direct Hydration, Distillation Train, and the Isopropanol–Water Azeotrope

Direct propylene hydration in China is more prevalent than the indirect sulfate route because it avoids the reconcentration of strong acid streams and produces a less contaminated crude product. In a fixed-bed direct hydration unit, propylene and deionized water are reacted over a solid phosphoric acid or sulfonic acid resin catalyst; the effluent contains unreacted propylene, water, 2-propanol, diisopropyl ether, and acetone. The initial distillation sequence must remove acetone at 56.2°C and diisopropyl ether at 68.5°C before the isopropanol–water azeotrope at 87.7 wt% 2-propanol and 80.37°C can be resolved. Distillation alone cannot produce low-water industrial material; a dehydration step—azeotropic, extractive, or membrane-assisted—is required. In an azeotropic dehydration unit, benzene or cyclohexane may be used as the entrainer, which creates a residual benzene risk that downstream pharmacopoeial limits reject. Modern Chinese plants exporting high-purity 2-propanol therefore increasingly use membrane dehydration to avoid aromatic contamination. At the azeotrope, the dehydration column must remove at least 12.3 kg of water per 100 kg of azeotropic mixture before the high-purity finishing column. Published data for specific column sequencing is limited because reflux ratio and tray efficiency are treated as proprietary.

The critical control parameter for high-purity exports is not water alone. In production by indirect hydration or older azeotropic drying, benzene can be used as an entrainer, creating a residual aromatic impurity that fails USP and cosmetic limits. Modern Chinese plants producing export-grade 2-propanol increasingly use extractive distillation or membrane dehydration to avoid entrainer contamination; however, purchase specifications still require a benzene result below 2 µL/L on the COA for pharmaceutical applications.

Bulk packaging and transport marking follow UN approval, Class 3 segregation, and moisture protection requirements

For export from China, standard packaging options are UN-approved steel tight-head drums, composite IBCs, and ISO tank containers. A 200 L steel drum conforming to UN 1A1 typically carries 160 kg net; a 1000 L IBC conforming to UN 31H1 carries approximately 800 kg net; a 20 ft ISO tank container carries about 21,000 L, subject to tank design rating and port weight restrictions. The filling ratio is controlled by the volumetric expansion coefficient of approximately 1.1 × 10⁻³ K⁻¹; drums are commonly filled to 95 vol% at 20°C to allow heating to 40°C without pressure venting. Because 2-propanol is hygroscopic, low-water and electronic grades are filled under dry nitrogen and sealed immediately; exposure to 60% relative humidity can raise water content beyond the 0.1 wt% limit if a drum is left open for several hours. Bonding and grounding during transfer are mandatory because 2-propanol has a low electrical conductivity and can accumulate static charge. Storage in 304 or 316 stainless steel with a 2B finish is preferred for water-sensitive grades; unlined carbon steel and galvanized surfaces are avoided because iron oxide or zinc ions can contaminate the product. Copper alloys are not used in low-water service because trace metal ions accelerate autoxidation and peroxide formation under ultraviolet exposure. During maritime transport, the IMDG Code requires segregation from strong oxidizers of Class 5.1 and from spontaneously combustible goods of Division 4.2.

Pre-shipment inspection should verify UN marking integrity, drum closure torque, and the lot number against the COA. A drum opened for sampling at the terminal should not be re-sealed as original unless the entire vessel is under dry nitrogen; otherwise, the opened drum should be segregated and priority-released. For ISO tank cargo, an ullage of at least 5% is retained, and the tank pressure relief setting is checked against the maximum working pressure.

When cargo moves under Incoterms 2020 and Chinese dangerous goods regulations

Chinese 2-propanol exporters commonly quote terms under FOB Shanghai, FOB Ningbo, CIF Busan, or DAP Rotterdam. Under FOB Shanghai, the supplier is responsible for export declaration, Chinese port charges to the vessel, and the dangerous goods declaration; risk transfers when the cargo is on board. Under CIF, the supplier additionally arranges freight and minimum insurance, but risk still transfers at the loading port. Under DAP, the buyer clears import customs and pays duties, while the supplier bears delivery risk to the named place. The Incoterms rule does not affect dangerous goods packaging or documentation duties.

For China-origin 2-propanol, export documentation typically includes a Commercial Invoice, Packing List, Bill of Lading, Certificate of Origin, Certificate of Analysis, Safety Data Sheet under GHS Revision 8, and a dangerous goods declaration under the IMDG Code. Under the Regulations on the Safety Administration of Hazardous Chemicals (State Council Decree No. 591), Chinese manufacturers and exporters must provide a hazard classification certificate and a packaging inspection report; port authorities may block container stuffing if the UN marking or labeling is incomplete. A common shipment hold item is a mismatch between the physical product and the declared HS code: a single-compound 2-propanol shipment of 99.5 wt% purity is correctly declared under 2905.12, but a formulated hand rub containing 75 vol% 2-propanol is not covered by that subheading and requires separate customs classification. A destination country may also impose import permits for pharmaceutical or cosmetic grade; the supplier should verify the buyer’s license before dispatch.