|
HS Code |
227876 |
| Chemical Name | 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone |
| Molecular Formula | C10H9ClN2O4S |
| Molecular Weight | 288.71 g/mol |
| Appearance | Yellow crystalline powder |
| Melting Point | 210-215°C |
| Solubility In Water | Slightly soluble |
| Storage Conditions | Store in a cool, dry place away from sunlight |
| Purity | Typically >98% |
| Cas Number | 89-46-3 |
| Application | Intermediate for azo dye synthesis |
| Boiling Point | Decomposes before boiling |
| Ph Value | 4.5-6.5 (1% aqueous solution) |
| Odor | Odorless |
| Stability | Stable under normal conditions |
| Hazard Class | Irritant |
As an accredited 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | The chemical is packaged in a sealed 500g amber glass bottle, clearly labeled with hazard warnings and product identification for safe handling. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): Typically packed in 25kg fiber drums, 8MT per 20' FCL, securely palletized to ensure safe chemical transport. |
| Shipping | The chemical **3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone** should be shipped in tightly sealed containers, protected from moisture and direct sunlight. Transport must comply with local regulations for hazardous chemicals, including labeling and documentation. Handle with care to prevent leaks, and use appropriate packaging materials to ensure safe delivery. |
| Storage | Store **3-methyl-1-(2′-chloro-5′-sulfonicphenyl)-5-pyrazolone** in a tightly sealed container in a cool, dry, and well-ventilated area, away from direct sunlight, moisture, and incompatible substances such as strong oxidizers. Ensure proper labeling and use secondary containment to prevent spills. Personal protective equipment (PPE) should be used when handling to avoid inhalation or skin contact. |
| Shelf Life | Shelf life: **3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone** is stable for 2–3 years if stored in a cool, dry, airtight container. |
Competitive 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone prices that fit your budget—flexible terms and customized quotes for every order.
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Working in chemical synthesis for decades, practical demands shape the direction of every new molecule we bring from bench to plant. The story of 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone started not in a boardroom, but in a formulation laboratory pitted with real problems: unstable dyes, poor coupling yield in pigments, and frequent inconsistencies in final product tone. Formulators and technical teams shared their day-to-day frustrations, pushing us to dig into pyrazolone chemistry. This compound stands out from earlier generations with a strong electron-withdrawing sulfonic acid function and targeted halogen substitution.
Over the years, manufacturers like us kept hearing about instability in colorants, irregular crystallization, and filter clogging—a direct hit to plant efficiency and downstream quality. By tweaking the ring structure and introducing the 2’-chloro and 5’-sulfonicphenyl substitutions, we enhanced reactivity for azo coupling, delivering cleaner, more reliable outcomes, especially in azo pigment synthesis.
Our technical team studies the reaction performance from raw material all the way through final application. A methyl group at the 3 position offers a balance between hydrophobicity and reactivity, avoiding the oversensitivity often found with unsubstituted pyrazolone cores. Adding a 2’-chloro-5’-sulfonicphenyl ring further steers selectivity in coupling reactions. This particular architecture emerged from hundreds of small test batches and hours spent observing kinetics on the plant floor.
Unlike pyrazolones lacking either the sulfonic acid or chloro group, this product achieves high solubility in aqueous systems, maintains stability under thermal stress, and reduces unwanted side-products in azo dye formation. Factory operators and QC heads pointed out early on that even minor shifts in substituent position can lead to measurable downstream changes: filtering times, consistency in tint, and reduced need for batch corrections.
Every supply batch is monitored at each stage: raw sulfonation reagents, intermediates, controlled reaction temperature, and purification finish. Specifications focus on real use cases: purity above 98%, minimal ash, controlled chloride content. Each production lot undergoes HPLC tracking, analyzed for residual starting material, and stress tested for shelf stability. Some broad claims sound nice on paper, but only actual plant logbooks tell the truth about how a product runs. We don’t claim this as the highest purity on the market, but each batch consistently meets or outperforms the demands set by large-scale dye and pigment houses.
Packing departments keep feedback loops open with application chemists. Tackling caking, flow issues, dusting, and particle size distribution isn’t just for regulatory comfort. At customer sites, powdered intermediates like this have a reputation for clumping and bridging in hoppers. By working directly with end users, we developed an even-running, free-flowing grade that improves transfer and mixing in large vessels. Less clogging means less downtime—less time spent scraping, udging, and restarting.
Nearly all demand for 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone comes from colorant synthesis, especially as a diazo component in azo dyes. The plant teams responsible for scale-up highlight that this compound speeds up coupling reactions at mild conditions, cutting down energy costs and reducing hazardous by-products. Colorant manufacturers using our product often report sharper, longer-lasting shade development in both textile and ink applications.
For those trying to drive performance in pigments, the sulfonic acid group increases water solubility, helping creators of disperse dyes and inks meet modern wash-fastness and light-fastness standards. Many dye intermediates with less polar substituents miss this mark, leading to costly rework or short-lived products. We’ve watched production engineers reduce buffer salt loads, owing to the ionic nature of this specific sulfonated pyrazolone. Detailed records from continuous plant runs confirm real savings.
Manufacturing doesn’t allow for wishful thinking; throughput and yield depend on reliable ingredients. Over the years, we noticed increases in customer uptime and reductions in pigment dust emissions when integrating this upgraded pyrazolone. Laboratories working with lower-grade or unsulfonated pyrazolones by competitors faced filter press clogging, uneven batch color, or slow coupling rates. By offering this targeted substitution pattern, we solved more than a chemical riddle—we addressed functional problems inside busy dye plants.
Operators inside those facilities often cite dusting and inhalation concerns. At our facility, we improved not just the powder characteristics but also added a custom anti-caking treatment upon customer request. Startup time for new batches shortened; maintenance teams called these incremental design tweaks “game changers.” Most stories of chemical breakthrough skip past these shop-floor moments, but for manufacturers, those tweaks drive supply contracts and repeat orders.
Every competitor presenting a similar intermediate claims unique performance. We ground our improvements in years of repeat trial runs, tracking both yield and side-product rates. On runs using unsubstituted 5-pyrazolone or products without the sulfonic acid tail, we faced off-spec batches and pigment wash losses—quantifiable, not hypothetical. Switching over to this variant allowed production rates to increase and waste landfills to shrink.
In technical support calls, application operators stress test our lots against obscure impurities. Those running older grades usually flag filter plugging and brownish by-product sludge. With 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone, cleanup times drop. Processing teams can dose less sodium chloride and enjoy longer filter run intervals, thanks to reduced micro-aggregation of pigment particles. Our process engineers tracked this improvement in metric tons per month, not costless anecdotes.
No one in the chemical industry benefits from lab-scale novelty unless it survives truckload shipping and works the same way on a 10,000-liter mix vessel. Several years ago, a few large-scale pigment makers shared data on losses caused by inconsistent intermediate performance. Batches would suddenly shift in hue or rheology, sabotaging entire product lines. Analysis revealed the key issue: unoptimized substitution on the starting pyrazolone.
Working closely with their technical staff, our teams fine-tuned the structure and then validated every property that mattered—reaction time, pigment filter rate, resistance to oxidation, and actual environmental flashpoint data. These measurable differences replaced guesswork with better process control. The rate of out-of-spec pigment batches fell sharply, and overtime hours tied to troubleshooting dropped.
A modern chemical intermediate can’t just function; it must prove itself safe for handling and reduce downstream risk. Our production environment tracks all worker safety data closely—dust suppression, ease of handling, and corrosivity. The sulfonic acid group, while conferring solubility, also demands corrosion-resistant transfer lines and tanks. Here, plant maintenance teams weighed in on material compatibility, recommending upgrades to lined vessels and gasket choices to extend equipment lifetime. Each suggestion looped back into how we shipped and labeled our product.
Operators in dye plants shared environmental impacts: effluent containing this compound neutralized more readily, with lower biological oxygen demand in comparison to non-sulfonated versions. The lower load of persistent organic pollutants reduced regulatory headaches, and wastewater treatment plants no longer flagged stubborn aquatic toxicity outliers. Traceback from thousands of pounds processed proved the practical improvements, not just theoretical green credentials.
Experience in bulk chemical manufacturing shapes our opinion of “difference.” Comparison with earlier pyrazolone models—lacking either the chloro or sulfonic substituents—shows the advantage this product brings in pigment plant runs. Minimized batch-to-batch variation means more uptime and fewer product quality disputes from clients at the next tier. Most pigment manufacturers who switched to this version saw immediate upticks in final product consistency.
Competitors’ grades with only the chloro substitution or neutral phenyl rings perform noticeably worse in viscous dispersions. Direct customer logs documented slower filter clearance and reduced pigment brightness, while sulfonation without proper purification resulted in higher ionic by-product formation and lost time adjusting finished color.
It’s easy to talk about performance, but plant teams want evidence—a tale told by real metrics and operating hours. Our standard shipping containers get flagged for damage or caking, so we worked with logistics to reengineer packaging to resist humidity and short-term heat exposure. Fewer supply chain issues mean dye plants can keep lines running without delay.
Ongoing technical reviews keep us honest. Materials scientists run comparison panels with older and new grades side-by-side, under customer conditions. Any deviation in flow properties, caking, or coupling reaction yield leads to immediate reformulation or process fix. Our sales contracts depend on annual demonstration of process stability, something only a direct manufacturer can guarantee.
As environmental standards shift and colorant companies demand ever-improving shade reproducibility, the role of intermediates like this becomes central. Project managers at textile and coating plants ask for intermediates with traceable origins, predictable shelf lives, and little room for batch surprise. Internal audits now require full digital batch tracking, something we’ve implemented after learning from too many untraceable shutdowns in past years.
Growing trends in water-based inks and pigments push for intermediates with higher solubility and easier wastewater neutralization. Teams at our facility responded by adjusting purification methods, driving ash and heavy metal levels below limits stricter than typical industry standards. Our QC staff keeps a binned history of side-product formation profiles, letting us contribute data to joint product stewardship initiatives with major downstream buyers.
Bringing a specialty chemical from discovery to scale is never a straight line. We keep a war chest of pilot reports tracking solvent choice, surfactant impact, and continuous feedback from high-volume users. Every process change goes through small-scale simulation before a full plant run, with engineering staff running cost-benefit sheets and safety reviews.
Comparisons with earlier industry solutions—such as generic 5-pyrazolone, or lightly chlorinated intermediates—keep our focus sharp. Application teams running textile dye couplings put each batch through tests for stability in hard and soft water, endurance on synthetic versus natural fibers, and shelf consistency against temperature cycling. Laboratory results matter, but the real test has always been plant floor feedback: does product pour evenly, mix quickly, and meet color development targets every time?
Every advance in product quality here has come from customer problem statements, not isolated R&D dreams. Large pigment producers bring their bottlenecks directly to our technical liaisons, and every recurring plant issue turns into a production trial, not a theoretical solution. This collaborative work style shapes how our grade differs in real use—and shows up in longer-term commercial partnerships.
Maintenance heads at dye plants want intermediates that clean out of tanks with less water, leave no persistent residue, and allow faster switchovers between color lines. Factory managers want lower reject rates and little unscheduled downtime. Our adjustments to this sulfonicpyrazolone, from flow improvement to by-product minimization, produce measurable financial savings for these users. That’s the true dividing line between a technical grade and a problem-solving chemical.
Long-lasting chemical intermediates don’t emerge from a one-off invention, but an evolving story of feedback, technical fixes, and practical gains. Our records show a track record of improving coupling yields, reducing pigment wash losses, and supporting customers through formulation tweaks as their markets change. In a market where users are measured by consistent quality and regulatory resilience, a robust and reliable supply of 3-methyl-1-(2’-chloro-5’-sulfonicphenyl)-5-pyrazolone does more than just check a compliance box—it changes the economics of colorant manufacturing.
Our future plans focus on continual benchmarking and direct problem-solving. Teams continue to develop purer grades, lower dust, and safer handling forms. By tracking field performance daily, we aim to keep this intermediate at the leading edge of colorant chemistry—always tested by plant-floor facts, not just catalog specifications.
