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HS Code |
122624 |
| Chemical Name | Propylene |
| Chemical Formula | C3H6 |
| Molecular Weight | 42.08 g/mol |
| Cas Number | 115-07-1 |
| Appearance | Colorless gas |
| Melting Point | -185.2°C |
| Boiling Point | -47.6°C |
| Density At 0 C 1 Atm | 1.808 kg/m³ |
| Solubility In Water | Slightly soluble |
| Odor | Faintly sweet |
| Vapor Pressure At 25 C | 849 kPa |
| Flammability | Highly flammable |
| Auto Ignition Temperature | 455°C |
| Lel Lower Explosive Limit | 2% (by volume in air) |
| Uel Upper Explosive Limit | 11.1% (by volume in air) |
As an accredited Propylene factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Propylene is packaged in 50-liter high-pressure steel cylinders, featuring clear hazard labels, safety valves, and proper ventilation instructions. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL) for Propylene involves safely transporting liquefied gas in ISO tanks or cylinders within a 20-foot container. |
| Shipping | Propylene is shipped as a liquefied, flammable gas under pressure in specialized, clearly labeled cylinders or tank trucks. Containers must comply with transport regulations and be kept upright, away from heat or ignition sources. Proper ventilation, grounding, and secure storage are essential to prevent leaks, fires, and hazardous vapor accumulation during transit. |
| Storage | Propylene should be stored in well-ventilated, dedicated, and labeled pressure vessels or cylinders, constructed from compatible materials like carbon steel. Tanks must be equipped with pressure-relief devices, kept away from heat sources, and grounded to prevent static discharge. Storage areas should be cool, dry, away from oxidizers or ignition sources, and comply with all relevant safety and regulatory guidelines. |
| Shelf Life | Propylene typically has an indefinite shelf life when stored properly in tightly sealed containers, away from heat, sunlight, and sources of ignition. |
Applications of Propylene in Industrial ManufacturingPropylene serves as a fundamental feedstock across multiple manufacturing industries. Its reactivity and direct polymerization potential enable large-scale production of essential polymers, intermediates, and specialty chemicals. As an original chemical raw material supplier, we deliver high-purity propylene to support varied customer processes and ensure downstream product consistency. 1. Polypropylene Resin ProductionManufacturers use propylene monomer as the core building block for polypropylene resin. Polymerization takes place via Ziegler-Natta or metallocene catalysts under controlled conditions, directly impacting molecular weight and polymer properties. Accurate flow control, continuous gas-phase or slurry-phase operations, and strict impurity limits define the production environment to deliver precise resin grades used for automotive, packaging, and industrial products. Industry compliance standards
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2. Acrylonitrile ProductionIn the Sohio process, propylene reacts with ammonia and air using a fixed-bed catalyst to produce acrylonitrile, an intermediate for acrylic fibers, ABS plastics, and specialty rubbers. Process operators manage reaction temperature, propylene feed rate, and ammonia-to-propylene ratios to maximize conversion. Purity and contaminant control are essential to prevent catalyst poisoning and product degradation down the line. Industry compliance standards
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3. Oxo Alcohols Synthesis (n-Butanol, 2-Ethylhexanol)Propylene is the starting point for oxo alcohol synthesis via hydroformylation (oxo process), where it combines with synthesis gas (CO and H₂) to produce butyraldehyde, subsequently hydrogenated to n-butanol or further alkylated to 2-ethylhexanol. This route requires careful control over pressure, temperature, and ligand-modified catalyst systems for high selectivity. Downstream purification ensures alcohols meet plasticizer and solvent product quality. Industry compliance standards
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4. Cumene (Isopropylbenzene) for Phenol & AcetonePropylene reacts with benzene over an acidic catalyst to produce cumene. This intermediate then undergoes oxidation and cleavage to yield phenol and acetone, both extensively used in polymer and resin manufacturing. Efficient catalyst management, propylene-to-benzene feed proportioning, and closed-loop recycling dictate conversion efficiency and product yield in integrated production facilities. Industry compliance standards
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5. Propylene Oxide for Polyether Polyols & GlycolsThrough chlorohydrin or hydrogen peroxide direct oxidation processes, propylene converts to propylene oxide, an essential intermediate for polyurethanes, surfactants, and glycol ethers. Operational safety, continuous reactor monitoring, and selectivity management are critical to controlling glycols content and minimizing chlorinated byproduct formation. Propylene purity and stability directly affect polyol function in downstream flexible foam and CASE (coatings, adhesives, sealants, elastomers) manufacturing. Industry compliance standards
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6. Isopropanol SynthesisPropylene undergoes indirect hydration (sulfuric acid process) or direct catalytic hydration to form isopropyl alcohol—a critical solvent and pharmaceutical intermediate. Manufacturers maintain strict reaction temperature and water-to-propylene ratio for stable conversion, while end-user requirements may specify food-grade or USP-standard isopropanol output, depending on downstream needs. Industry compliance standards
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Competitive Propylene prices that fit your budget—flexible terms and customized quotes for every order.
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Working for decades as a manufacturer, I have found that propylene holds a steady place in many industries. Our experience has taught us that quality in propylene directly influences everything downstream, from plastics and fibers to solvents and chemical intermediates. The propylene we produce follows a consistent model developed from years of refining process parameters. Our plants utilize advanced distillation and purification steps, delivering propylene at a purity that meets high polymer and chemical grade standards. The typical grade we supply exceeds 99.5% by GC, with tight management of common by-products such as ethylene, propane, and methylacetylene.
Having spent years on the shop floor and in the control room, I have seen first-hand how differences in feedstock and purification techniques show up in the final product. We run continuous monitoring with gas analyzers and chromatographs. As a result, we resolve impurities before they become a problem for our customers. Each batch matches precise hydrocarbon profiles because of our focus on source control and process discipline. Plant audits, raw material checks, and automatic loop controls have become habits, not afterthoughts.
Customers who process our propylene for polypropylene production tell us that consistent purity makes a marked difference in their reactor runs. Variability in propylene quality often leads to off-grade polymer or fouling in reactors, resulting in downtime. That said, we never shortcut on fractionation or overlook the need to remove trace contaminants like water, acetylenes, or sulfur compounds. Drying columns and guard beds are in place to filter out unwanted traces long before the product leaves our tank farm.
Propylene serves as a backbone for a wide variety of products:
In some cases, lower grades of propylene are acceptable, such as for certain production lines where non-critical chemical reactions take place. We still supply these grades, but only after thorough review and agreement on acceptability for those specific reactions. Over time, more downstream producers have begun to ask for high-purity grades as they automate and scale up production. The push for tighter margins means that cutting corners carries little reward and big risk.
From my perspective, customers often focus on four key measures: purity, moisture, total sulfur, and acetylene content. Our GC analyzers report propylene content down to decimal places. For moisture, we use inline sensors and Karl Fischer titration, delivering values typically below 10 ppm. Total sulfur drops below 1 ppm thanks to a string of adsorber beds and lean vaporization design. Acetylene is measured by trace detectors, and our teams check readings hourly to verify that it remains far beneath accepted thresholds.
Building repeatable results demands consistency, not just on paper, but on the ground. Our control teams record every significant process event, whether it's a feed change, tray cleaning, or pump maintenance. Auditing these logs lets us catch potential deviations well before they enter the supply chain. As a manufacturer, we stand out because hands-on experience leads to a sense of duty at every production step. In this business, sending out a subpar batch once can unravel years of trust with clients. Long-term partnerships have been built over results measured tank by tank, day after day.
Being a manufacturer means our expertise sits where the chemistry happens. Traders and resellers often misunderstand the subtleties in propylene supply. Our involvement begins with feedstock selection—naphtha cracking, propane dehydrogenation, or FCC off-gas streams. Each route introduces differences not only in efficiency but also in trace impurity patterns. For example, PDH units lean toward higher propane carryover unless precisely controlled. Naphtha crackers might show a more complex hydrocarbon background. Sorting out these differences requires deep process knowledge, not just reading a spec sheet.
One simple rule from years of experience: if you want to minimize surprises, know your unit, your feed, and your product. We never blend sub-spec tanks or gamble with short-term fixes—it’s always better to run extra purification or divert a problem stream than let a questionable batch reach a demanding application, like PO or medical-grade polypropylene.
People outside the industry sometimes confuse propylene with propane or ethylene. Though close in chemistry, their roles and properties diverge. For starters, propylene features a double bond, making it much more reactive for polymerization. Propane acts mostly as a fuel and rarely as a chemical feedstock outside of dehydrogenation routes.
On the other hand, ethylene leads as the building block for polyethylene but offers different reactivity and market dynamics. Our propylene can't simply substitute for ethylene; the plants and catalysts are often specifically tailored for one or the other. Even minor impurities matter—ethylene compressors handle different moisture tolerances than those built for propylene, and mixing can lead to plant disturbances that no one wants to deal with mid-shift.
Within the propylene family, you will also find "polymer grade," "chemical grade," and occasionally "refinery grade." Polymer grade requires the lowest impurity levels—nearly all downstream polymerization catalysts lose effectiveness fast if exposed to acetylene or oxygenates. Chemical grade still demands good purity, but can tolerate a bit more leniency if the end-use is less sensitive, like for making certain solvents or glycol ethers. Even inside our own tanks, we keep lines between grades clear. Back in my early years, I witnessed what happened when a single slip in grade management set off a cascade of product batch rejections for key buyers.
We take health, safety, and environmental responsibility as part of our daily routine. Propylene carries a clear asphyxiation and fire risk profile. Every operator on my team receives hands-on training and walks through leak and fire scenarios every few months—much more than what you see on paper audits. Our production and loading areas stay well-ventilated, with fixed and portable gas detectors standing by for both continuous and spot checks.
Our emissions control includes vapor recovery systems, closed loading procedures, and active flare management. Over the years, we responded quickly to new environmental regulations. Even as requirements tighten, we’ve found ways to reduce vent losses without affecting product throughput. Meeting international standards for process safety (such as ISO or API norms) helps us share lessons learned with industry peers, and our practice of recording and investigating 'near-misses' has made actual incidents much rarer.
From a manufacturer's viewpoint, propylene markets have grown more complex. Propylene, once drawn mainly as a by-product from steam crackers, now shows growing support from dedicated PDH units. This change arose as demand for propylene-based plastics outstripped ethylene growth. We have watched investing in new production trains to keep up with this trend. This transition means more direct control over product quality—PDH routes usually produce higher initial purities but come with their own challenges for catalyst selection and regeneration.
We also notice shifts in regional supply and demand. Asia-Pacific drives global polypropylene consumption, prompting more local production units and less reliance on long-haul imports. Customers want shorter supply chains and faster response, which encourages us to position inventory closer to key partners. Our quality management system adapts with each new logistics hub—we can’t just rely on headquarters for troubleshooting anymore, so more responsibility falls on regional teams.
Operating a propylene unit doesn’t leave much room for complacency. Fouling in fractionator trays, off-spec vapor phase splits, trace moisture ingress—these issues show up unexpectedly, usually at the worst time. I have stood through nights where product flows slowed, and the heat balance shifted off design. The best response always comes from anticipating trouble, not chasing it. That’s why our team checks process data every shift, looks for trends, and acts before deviations turn into plant upsets.
Feedstock flexibility can rescue output during refinery turnarounds or cracker outages. Our units have been reconfigured temporarily in the past with alternative feeds like mixed LPG or FCC off-gases during tight markets. This switch calls for extra attention, as contaminant profiles change and purification must catch new trace elements. We have learned that clear communication matters—operations, lab, and logistics meet before every feed change to discuss monitoring and cleanup plans.
Quality deviations still happen, but closing the loop from production incident to root cause fixes possible gaps. A few years back, our maintenance data pointed to heat exchanger fouling causing subtle purity dips in summer months. After confirming with lab analysis and trending tools, we made design changes and boosted turnaround cleaning, which restored product reliability. Every plant, no matter how modern, benefits from learning cycles like this.
Our relationship with buyers doesn’t end at the shipping gate. Many partnered businesses invite us onsite for troubleshooting, startup support, or process optimization. Our team has walked polypropylene reactor floors, helped set up in-line analyzers, and advised on handling off-spec shipments when outside contamination occurred. Sharing knowledge is part of our manufacturing DNA; a smooth process for our customer means lasting trust and fewer surprises.
Often, new market entrants struggle with propylene quality nuances. They may attribute processing problems to catalysts or reactors when trace impurities in the feedstock might be to blame. We encourage open channels to share analytical results and support routine tank sampling. Over the years, this practice has weeded out confusion and built stronger quality assurance into everyone's process.
Our ongoing drive focuses on faster product analysis, lower energy consumption, and better yield management. Digital twins and process modeling have started to play a larger role. We now fine-tune operating conditions using predictive algorithms, letting us maximize production without flirting with safety or quality limits. Continuous improvement teams meet every quarter to review operating data, lab results, and customer feedback, driving a cycle that leads to new projects—like improved distillation trays, energy integration for waste-heat recovery, or integrating more efficient guard bed materials.
Efficiency has grown as both an environmental and cost target. Significant investment goes into optimizing heat integration across the site. Even minor changes, like adding pre-heaters or waste-heat boilers, add up over a production run that never truly stops. Our maintenance engineering teams evaluate process bottlenecks regularly, balancing unit modifications with uptime needs.
No commentary on propylene would be complete without addressing compliance. Stringent regulations shape not just what we make, but how we document, store, and transport. Our daily records allow any shipment to be traced back through equipment logs, lab notebooks, and control system histories. Local and international chemical regulations keep evolving, with new reporting or limits for specific trace elements. From the warehouse to the reactor, traceability is not just an inspection requirement; it forms the foundation for reliable recalls and quick spot checks.
We invest heavily in auditing, and not just once a year. Internal QA personnel test random product lots, check process alarms, and interview operators on shift. These efforts pay off—the industry rewards reputation built on compliance, not claims. I have experienced more than one successful regulatory review where detailed logs and proactive hazard management protected our operations and our customers’ businesses alike.
Over the years, trends change, but the need for reliable propylene supply remains a constant. We build plant upgrades, adopt new purification techniques, and retrain teams to meet customer expectations that never stand still. As recycled plastics and circular economy initiatives enter mainstream production, feedstock sources may evolve. Our technical teams now track not only primary production, but also the potential for chemical recycling routes that feed used polymers back into our own propylene lines.
Future approaches might include renewable routes leveraging bio-derived propylene production. We actively research these options, knowing that integration will take time and persistent effort to meet the same purity and safety standards as fossil-based units. Every step brings new challenges—different catalyst residues, altered impurity patterns, and new analytical demands.
All said, experience teaches that doing the work at the production source delivers the best product and the most transparent relationship with buyers. Our doors are always open for clients to see the technology, meet the engineers, and discuss improvement needs directly. Propylene is more than a building block—it ties together our commitment to manufacturing excellence, process safety, customer partnership, and continuous learning.
