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Chemical companies have watched sulfolane grow from a specialist solvent to a workhorse for purification and extractions. Its chemical formula, C4H8O2S, and molecular structure—a five-membered saturated ring with a sulfur atom and two oxygen atoms—grant it a well-earned reputation for stability and reliability. Sulfolane structure stands out for its resilience in harsh conditions. It owes this strength to its unique ring system. The molecular weight lands at 120.17 g/mol, a sweet spot that ensures both volatility control and strong solvating power.
Dig into the details, and you’ll see why industries pick Sulfolane every time. Its melting point sits at 27.5 °C, which gives it a solid form at room temperature in cooler climates and a liquid form when you need it in practical uses. It turns to vapor at its boiling point of 285 °C. This means it handles elevated process temperatures without breaking a sweat. The freezing point is right around the melting mark, consistent and predictable during storage and transport. Safety teams appreciate the flash point sitting at 165 °C. Handling risks drop way down when you work with a solvent that stays non-flammable under most plant conditions.
On the technical sheet, you’ll see Sulfolane CAS stands at 126-33-0. Accuracy around Sulfolane CAS number is essential for quality assurance and regulatory compliance. Global trade in chemicals turns on these identification numbers, and the market takes the detail seriously.
From lab techs to plant managers, what matters is whether a solvent does the job. Sulfolane answers through a remarkable solubility profile. It mixes freely with water. That’s not true for a lot of organic solvents, especially those tasked with dissolving tough-to-handle aromatics or polar compounds. Ask around in plant operations, and you’ll find sulfolane’s water solubility lets processes avoid messy and costly cleanup steps.
It’s not just water. Sulfolane holds its own with a wide range of hydrocarbons and other organics. Instead of struggling to clean out a tower or troubleshoot an extraction glitch, operators get predictability. No need for complex multi-solvent blends or custom clean-up chemistry. Sulfolane’s broad compatibility means fewer headaches and less downtime.
The biggest buyer of sulfolane? Oil refining and gas processing companies. They can’t stop talking about the Sulfolane Solvent Process, which relies on Sulfolane’s selective power to pull aromatics out of hydrocarbons. The aromatics-loving nature of sulfolane allows refiners to nail spec for high-octane fuels and keep production cost-effective. Environmental teams value the lower emissions footprint compared to the more hazardous extraction chemicals of older generations.
Outside petrochemicals, pharmaceutical companies lean on Sulfolane’s purity and traceability. The pH-neutral profile of this solvent means it won’t interfere with synthesis reactions or throw off bioactivity during process development. Electronics-grade facilities use it as a carrier and cleaner, where low residue and high purity make a real difference in yield and reliability measures.
The reliability of a solvent depends as much on its producer as its formula. Sulfolane Sigma, a trusted product line, comes up regularly. Labs committed to research and large-scale companies focused on plant economics both look for these established names. Sigma’s material specs provide the confidence that every drum and tote delivers expected quality.
The Sulfolane Company, as a supplier, has built its model on flexible logistics and constant technical support. They field the difficult questions about phase behavior, downstream treatment, and product blending without missing a beat. When there’s a supply chain crunch or a regulatory audit, having a supplier with a deep bench and a good compliance record saves hours—sometimes days—on troubleshooting and paperwork.
Plant-based teams pay attention to flash point, pH, and decomposition products. Sulfolane wins over traditional solvents with a flash point of 165 °C, reducing fire risk even during hot operations or under accident conditions. The pH value is typically close to neutral, which limits corrosion problems in mixed-metal or glass-lined reactors. On top of that, Sulfolane doesn’t trend toward forming highly toxic byproducts under normal process loads.
With environmental rules tightening every year, companies look for solvents with lower environmental persistence and easier remediation in the unlikely event of a spill. Sulfolane shows moderate biodegradability and good handling scores, proving it can meet compliance needs without driving up costs on containment or remediation procedures.
Chemical purchasing managers live and die by price and delivery timelines. Sulfolane price rides the wave of global feedstock costs and logistics bottlenecks, but established suppliers like Sigma or The Sulfolane Company keep pricing competitive with consistent quality. Bulk contracts, scheduled deliveries, and responsive customer service keep plants from running lean on inventory or paying premium spot-market rates.
As specialty chemicals go, Sulfolane is a cost-effective tool for what it delivers in purity, process control, and environmental compliance. Buying teams build strong relationships with suppliers who offer solid tracking, clear documentation of Sulfolane CAS No 126-33-0, and batch-specific certificates of analysis.
From the perspective of a chemical company, the need for reliable, high-purity solvents like Sulfolane has only grown as industrial technology becomes more demanding. As the refining and pharmaceutical sectors face new regulations, changing feedstocks, and more rigorous quality standards, only a handful of solvents continue to prove themselves up to the challenge. Sulfolano stands side by side with entire new generations of process chemicals, showing that strong fundamentals always matter.
Through advances in purification methods and new applications—from energy storage to advanced materials manufacturing—sulfolane’s core benefits keep growing. Research partnerships between chemical suppliers, OEMs, and end users ensure that Sulfolane stays at the forefront of practical, safe, and cost-effective process innovation.
Every supplier I’ve worked with, from multinationals to regional specialists, keeps an eye on how Sulfolane performs under new process constraints. The push is always on for reduced water use, better recovery, and minimized residual losses. Pilot projects focus on improving extraction rates and exploring closed-loop solvent recovery that drives both sustainability and margins.
By working closely with end-users, chemical companies gather real-world data that feeds into technical bulletins and process guides. This open exchange of experience trickles down into product development. Vendors can offer not just generic Sulfolane, but tailored grades for electronics, pharmaceutical intermediates, or even next-gen petrochemical processes. The ability to collaborate on these challenges keeps sulfolane adaptable, modern, and indispensable.
Sulfolane, marked by its CAS No 126-33-0, continues to earn its place in industrial chemistry. From oil and gas upgraders to pharmaceutical producers, those who depend on process reliability and environmental stewardship know why this solvent stands out. The right supplier—whether Sulfolane Sigma, The Sulfolane Company, or another proven source—makes all the difference for safe, efficient, and innovative use across the industry.
