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HS Code |
654348 |
| Chemical Name | Fuming Sulfuric Acid |
| Other Names | Oleum, Sulfuric Acid Fuming |
| Chemical Formula | H2SO4·xSO3 |
| Cas Number | 8014-95-7 |
| Appearance | Colorless to pale yellow oily liquid, fumes in air |
| Odor | Pungent, choking |
| Density | 1.92–1.98 g/cm3 (depending on SO3 content) |
| Boiling Point | ca. 45°C (for 20% free SO3) |
| Melting Point | ca. -51°C (for 20% free SO3) |
| Solubility | Miscible with water (exothermic reaction) |
| Ph | <1 (in aqueous solution) |
| Main Hazard | Highly corrosive, strong oxidizer |
As an accredited Fuming Sulfuric Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Fuming Sulfuric Acid is packaged in a 2.5-liter amber glass bottle with a sealed cap, labeled with hazardous material warnings. |
| Shipping | Fuming Sulfuric Acid, also known as oleum, must be shipped in corrosion-resistant, tightly sealed containers due to its highly corrosive and reactive nature. It should be labeled as a hazardous material and transported according to local, national, and international regulations, with proper ventilation, spill containment, and emergency response measures in place. |
| Storage | Fuming sulfuric acid should be stored in tightly sealed, corrosion-resistant containers, such as glass, stainless steel, or PTFE-lined vessels. Keep it in a cool, well-ventilated, dry area, away from moisture, heat sources, and incompatible materials like organic substances or combustibles. Clearly label the storage area and ensure secondary containment to prevent leaks or spills, using appropriate safety signage. |
Applications of Fuming Sulfuric Acid in Industrial ManufacturingFuming sulfuric acid, also known as oleum, serves as a core intermediate in several heavy and fine chemical sectors, delivering high reactivity and sulfur trioxide content for demanding oxidation and sulfonation reactions. Our production expertise supports clients across specialized downstream markets, where adherence to strict regulatory regimes, precise dosing methodologies, and integration within proprietary plant equipment is critical for process reliability and end product consistency. 1. Sulfonation of Detergent FeedstocksSulfonation plants in the household and industrial cleaning sector utilize fuming sulfuric acid as the primary sulfonating agent to synthesize alkylbenzene sulfonic acids (LAS), a backbone surfactant in synthetic detergents. The material’s high SO3 content allows for continuous feed in falling film or tubular reactors, optimizing throughput while minimizing impurities and color bodies in the finished anionic surfactant. Process controls depend on precise acid concentration and reaction temperature, each tailored to the linear alkylbenzene chain length and final detergent grade. Industry compliance standards
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2. Pharmaceutical API SulfonationProducers of active pharmaceutical ingredients deploy fuming sulfuric acid in precise charge-to-mass ratios for aromatic sulfonation steps, creating intermediates that enable targeted solubility and bioactivity in antihypertensive agents and antimicrobial drugs. These facilities operate under GMP conditions, with online purity analytics and detailed batch traceability throughout each campaign to ensure pharmacopoeia-grade outputs. System material compatibility and strictly defined hold times minimize process deviation and guarantee synthesis reproducibility. Industry compliance standards
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3. Caprolactam Synthesis (Nylon 6 Feedstock)Producers of polyamide intermediates rely on fuming sulfuric acid for the Beckmann rearrangement stage in caprolactam production, driving the conversion of cyclohexanone oxime under high-acidity conditions. Oleum’s SO3 concentration is set according to reactor configuration and product purity demand in continuous or batch operations, and real-time monitoring of acid strength and reaction temperature is essential to maximize conversion rates and downstream filtration efficiency. Industry compliance standards
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4. Dye and Pigment ManufacturingDye synthesis facilities employ fuming sulfuric acid as a key sulfonating agent for direct sulfonation of organic chromophores, enhancing water solubility and dye uptake profiles. The material supports formation of sulfonated azo and triphenylmethane colorants, where batch control and acid concentration must be synchronized with the specific dye class and stability requirements. Compliance with colorant impurity thresholds is critical, with acid addition regimes managed using precision dosing tanks and digitally monitored batch records supporting traceability in export markets. Industry compliance standards
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5. Aromatic Sulfonic Acid Monomer ProductionSpecialty monomer manufacturers incorporate fuming sulfuric acid to introduce sulfonic acid groups into arenes, creating monomers utilized in high-performance ion exchange resins and polymer electrolytes. Reactor systems operate at controlled temperatures with continuous acid feeding, with finished monomer purity and molecular weight strictly validated by HPLC and titration methods. Compliance with resin application criteria and raw material purity indices guides formulation parameters and in-process verification protocols. Industry compliance standards
Typical usage ratio
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Competitive Fuming Sulfuric Acid prices that fit your budget—flexible terms and customized quotes for every order.
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In nearly every corner of chemical manufacturing, fuming sulfuric acid plays a decisive role. Known throughout our industry by its common name—oleum—this acid isn’t just another commodity. For decades, we’ve manufactured fuming sulfuric acid, drawing on our technical history and consistent process control to offer a product trusted by a spectrum of businesses. Our oleum contains defined concentrations of free sulfur trioxide, and through steady investment in equipment and analytical instrumentation, we continually refine both concentration and purity. Each ton leaves our plant up to demanding standards, a testament to our commitment to quality over expedience.
Chemical manufacturing isn’t a business that respects shortcuts. Fuming sulfuric acid, especially, stands apart for its unique reactivity and potency. Unlike standard sulfuric acid, which traditionally contains about 98% H2SO4 and a maximum water content, fuming sulfuric acid takes things to the next level through the intentional addition of sulfur trioxide (SO3). This addition changes both the structure and the risk profile, reflecting in its behavior during process work and how plant crews handle it. Our products typically range from 20% to over 65% free SO3, available in models like 20%, 25%, 40%, and 65%. Each model solves a specific challenge: some customers need aggressive sulfonation, some require precise sulfonic acid synthesis, and some rely on the highest grades for specialty dyes and explosives intermediates.
Anyone who’s worked with fuming sulfuric acid learns respect for its volatile nature. Unlike simple sulfuric acid, fuming grades release dense, irritating fumes, as SO3 volatilizes in the air. These fumes bring an extra layer of risk to operation and transport, so equipment selection, personnel protective gear, and ventilation must match the challenge. Over our years manufacturing it, we’ve built specific filling halls, trained work crews, and developed dedicated loading systems that protect both the workers and the integrity of the acid—because the margin for error is extremely thin.
Sulfonation reactions require a level of reactivity that standard acid can’t meet. A typical sulfonation plant demands an acid that won’t dilute their key intermediates, won’t stagnate productivity, and won’t introduce unpredictable side products. Fuming sulfuric acid steps up in these moments; the free SO3 transforms aromatics with unmatched efficiency, allowing the production of detergents, surfactants, dyes, agrochemical intermediates, and polymers. Without a consistent and reliable source, many supply chains would slow, if not falter entirely.
In our own facility, we manufacture fuming sulfuric acid through tightly controlled batch and continuous processes. Every lot faces routine checks: sulfur content, SO3 fraction, water level, and trace metals. We maintain full product traceability, not because a specification says so, but because experience has taught us that robust records catch issues before they escape the site and threaten a customer’s process or safety. Decades of handling oleum under different conditions—long-haul transport, pump transfer, batch reactivity—has built an understanding that ends up written right into our plant procedures.
Take the production lines for chlorosulfonic acid, where even minor impurities in the acid disrupt batch yields. The presence of free SO3 in fuming sulfuric acid pushes the reaction forward with a reactivity that plain sulfuric acid simply cannot match. We supply some of the most demanding agrochemical and pharmaceutical manufacturers—not just because oleum is required, but because each run must repeat with minimum surprise.
Dye manufacturing stands out as a field where acid purity and concentration dictate color brightness, yield, and even product shelf life. Our higher-grade oleum helps maintain batch color consistency and cuts down on downtime from contamination. Certain sulfonic acid syntheses actually stall or create excess tar if SO3 content falls below target. Through years of collaboration with dye plants, we’ve tuned our production cycles to hit the mark every shift, every vessel, every day.
Explosives intermediates—such as organic nitro compounds—rely on fuming sulfuric acid for consistent nitration conditions. Even a small deviation in acid concentration may alter crystal habit, stability, or product purity. Across years of shipments, we’ve responded to customer feedback, fine-tuned transport, and adopted bulk handling methods that reduce spillage and boost operator safety. It’s not paperwork that safeguards a shipment; it’s the learning gained from every loaded tanker and every customer call about process yield.
The manufacture of fuming sulfuric acid starts with high-purity sulfur dioxide and a dedicated catalytic oxidation process to generate SO3. Capturing and dissolving SO3 into concentrated sulfuric acid requires not just reactors and condensers but careful monitoring of temperature and flow. We have invested repeatedly in process controls, SCADA integration, and field analytics, ensuring that no batch leaves the plant without confirmation of its composition.
Storing and transporting fuming sulfuric acid isn’t just a logistical issue. We use dedicated stainless steel or glass-lined tankers for every shipment. All the fittings, gaskets, and hoses need constant inspection to fend off leaks and corrosion. Entry-level operators learn fast why complacency has no place here. Our maintenance crews follow stringent protocols, because the release of SO3 doesn’t just disrupt operations, it puts people and the environment at risk.
We calibrate sampling tools regularly. Analytical chemists double-check results before authorizing a lot for shipment. Any deviation triggers a root-cause analysis, with input from operations, lab, and the safety team. Everyone accepts that finding and fixing an issue is better than troubleshooting a recall from the field. Those lessons fill up thick logbooks, inform our training modules, and improve our next cycle.
The chemical industry never stands still. New applications for fuming sulfuric acid emerge, from advanced battery electrolytes to next-generation surfactants. Our job isn’t to rest on legacy processes, but to consider, test, and adapt to evolving customer needs. Sometimes, a client comes to us with a puzzle—such as a reaction that stalls unexpectedly or a purity demand not seen before. Rather than guesswork, we look at batch data, talk process chemistry, pull years’ worth of analytics, and run pilot tests.
Our R&D constantly seeks ways to further reduce trace impurities and stabilize SO3 content across longer shipping times. Innovations in packaging, air mitigation, and tank lining have all grown out of partnerships with end-users. Through feedback, we’ve sharpened our process—not out of commercial necessity alone, but because our reputation has been built one shipment at a time, by standing behind each customer’s results.
Every operator, engineer, and loader working with fuming sulfuric acid knows that personal experience counts most during emergencies. Rapid reaction to spills, containment strategies, and proper neutralization make the difference between a problem and a disaster. We invest hard hours into drills, safety workshops, and joint exercises with regional responders. It’s rooted in knowing that an ounce of prevention isn't just a slogan for us—it’s a survival strategy.
Working with fuming sulfuric acid day in and day out, we understand why training and equipment quality command respect. Respirators, eye protection, acid-proof clothing, and sealed workspaces come standard. Safety showers and neutralization stations line all transfer points. No shortcut replaces basic vigilance, and no amount of paperwork substitutes for people who know their process, their gear, and their chemistry. We keep open lines of communication between shop floor and management—anyone who spots an issue can halt a job and flag for review.
Regular audits, both internal and from trusted partners, catch small problems before they swell. Decades have taught us to treat every minor leak or unusual odor as a teachable moment—process tweaks and retraining follow, and we make a habit of sharing those lessons broadly, not keeping fixes tucked away. That philosophy makes our operation more robust and prepares our crews for both routine and the rare unexpected event.
For us, inconsistent fuming sulfuric acid doesn’t just cost money or disrupt schedules. It undermines the trust that customers place in their suppliers. In this specialty market, shortcuts and diluted commitments stand out immediately—and the backlash is deserved. So each tank, drum, or bulk load bears our internal guarantee that it will meet analysis or it doesn’t move. We document every process parameter, test report, and shipping condition because we understand the cost of failure isn’t only chemical—it’s reputational. Our customers reach us directly to discuss their next formulation, and that’s the level of transparency we expect to deliver.
We have customers who measure success in grams per liter, milligrams per kilogram, or less. We’ve seen cases where a batch off by a single percent shuts down an entire reactor system. These aren’t rare edge cases—they’re the daily reality for fine chemical and pharmaceutical sites. So, quality assurance in our plant starts at raw material reception and finishes with careful handling at the customer’s site, with every intermediate check documented, checked, and signed off.
Standard sulfuric acid, produced at 98%, serves as an industrial workhorse for fertilizers, metal pickling, and general acidulation. But standard grades do not push the chemistry of sulfonation, alkylation, or advanced dehydration. Fuming sulfuric acid transforms specific reactions, achieving higher yields, faster throughput, or selectivity impossible with regular acid. In practical terms, we see dye intermediates crystalize faster, agrochemical reactions run cleaner, and specialty polymer additives reach ideal functionality.
Handling requirements also separate fuming from regular acid. Fuming grades require air-tight transfer, acid-resistant pumps and piping, and a level of staff training that grows out of experience, not just certification. Regular acid can soak into many chemical workflows; fuming demands special consideration at each step—from unloading to waste treatment. We share equipment design specs, training modules, and incident histories openly if asked, because safe use in the customer’s plant protects everyone.
Business relationships in the fuming sulfuric acid market rarely follow the regular pattern of commodity sales. Our customers rely on logistical agility, regular technical support, and a genuine willingness to troubleshoot real-world issues. A missed delivery does not simply mean a dock sits idle; it means batch processes back up, shipping contracts slip, and, in the end, real revenue loss piles up.
Based on decades of feedback, we’ve expanded storage, diversified packaging types, and invested in CIP (clean-in-place) tanker systems. We offer delivery in small drums for R&D as well as bulk ISO tanks for major manufacturing. Each pack size gets specific attention—not just a scaling issue, but a clear fit with evolving customer needs. When international regulations tighten, we adapt our documentation, update training, and maintain compliance without waiting for supply disruptions.
We’re open with customers about logistical complications, regulatory changes, and process improvements. To discuss performance issues, our technical teams troubleshoot alongside plant chemists. This approach helps us understand the root of a problem, evaluate causes—whether from raw material changes, process drift, or equipment fouling—and apply lessons to improve both our product and the customer’s result.
Looking ahead, the demand for cleaner chemistry, energy-efficient processes, and new specialty molecules means fuming sulfuric acid will gain even more importance. As new environmental controls arrive, as waste minimization becomes a stronger driver, and as the need for higher-purity endpoints grows, we remain focused on advancing both the product and the underlying operations.
Through continual investment in plant upgrades, emission controls, and staff development, we boost reliability, product consistency, and safety. R&D efforts center on minimizing residual undesired by-products, exploring greener raw material sources, and helping customers integrate circular economy principles without losing the reactivity they depend on.
As manufacturers, we stay engaged with each step of fuming sulfuric acid’s journey—from raw sulfur through high-tech reactors, to specialized handlers, to the end user’s loading dock—because every detail matters. Our plant teams bring together technical know-how, field experience, and a strong safety culture to support reliable industrial progress. Knowledge gained from years of making and moving fuming sulfuric acid shapes every process control, equipment upgrade, and customer conversation. This focus keeps us improving, responding, and delivering the fuming sulfuric acid that modern industry depends on.
