Solutions · Monomer Storage
Terephthalic acid is a key raw material for PET and polyester, adipic acid for nylon. Both are acidic, crystalline powders that dust, cake, and must stay pure. PW Silo Systems designs aluminum and stainless steel silos for PTA and adipic acid with you – material and design are defined with you for your product.
PTA & Adipic Acid Storage at a Glance
A PTA silo stores purified terephthalic acid for PET, polyester fiber, film, and resin production. An adipic acid silo stores adipic acid for nylon, polyurethane, plasticizer, or other chemical production. Both feed the product in a controlled way to weighing, slurry preparation, or reaction.
PTA and adipic acid are acidic, crystalline powders. They dust during filling, can cake under pressure and moisture, and must not be contaminated, because impurities show up in the polymer. That is why the silo material, the design, and the discharge equipment are defined together with you for your product and your site.
Why PTA & Adipic Acid Are Demanding
Purity, acidity, dust, and caking decide whether a monomer silo runs reliably.
Monomers for PET and nylon must stay pure. Flaking coating or rust from coated carbon steel silos would end up in the polymer.
PTA and adipic acid are acids. Their effect on the silo material depends on the product, its moisture, and your process.
PTA is a fine powder that creates dust during pneumatic filling and conveying.
Crystalline acids can cake under pressure and moisture and build bridges above the outlet.
Polymer plants consume monomers in large quantities and need a reliable buffer between delivery and production.
PTA, adipic acid, and other monomers and comonomers must not be mixed by accident.
Silo Materials
We build silos exclusively in aluminum and stainless steel. Carbon steel is not an option for us: its coating is the only protection against corrosion – and flaking coating or rust can end up in your polymer.
Which of our two materials and which design fit your PTA or adipic acid silo depends on the product, its acidity and moisture, your process, and your site. We define the material and the design with you.
Your Pta And Adipic Acid Silo System
Silo, discharge, blending, filtration, and monitoring are engineered as one system. That means fewer interfaces for your team and components that are designed to work together.
Storage
Concentric mass-flow discharge without asymmetric flow zones – as standard, site-assembled, indoor, or multi-compartment silos.
Learn moreBlending
Gravity blending and homogenizing with four technologies, including PW ConeBlend with a hopper that is quick to clean.
Learn moreDischarge
Air fluidization for uniform discharge of poorly flowing products – prevents bridging and can be retrofitted to existing silos.
Learn moreDischarge
Vibration from unbalanced motors breaks up cohesive forces, resolves caking, and keeps the outlet clear.
Learn moreFiltration
Dust separation during pneumatic filling and conveying – sized for fine powders.
Learn moreMonitoring
Level measurement for reliable monitoring of the silo content – so you know when to reorder.
Learn moreMonomers & Comonomers
Products marked “Tested in our lab” are on our list of bulk materials. The others we review with you based on your material data before designing the silo.
Tested in our lab
Purified terephthalic acid, terephthalic acid, PTA
Terephthalic acid is on our list of bulk materials tested in our lab. Silo, discharge, and dust collection are designed for this fine powder.
Tested in our lab
Adipic acid, hexanedioic acid
Adipic acid is on our tested list. Material and design we define with you.
Review with us
Isophthalic acid, purified isophthalic acid, PIA
Isophthalic acid is used as a comonomer in PET and resins. We review your product data with you before designing the silo.
Review with us
Nylon salt, AH salt, nylon 6,6 salt
Nylon salt has specific storage requirements. We review them with you.
Review with us
Sebacic acid, decanedioic acid
Sebacic acid is used for specialty polyamides and plasticizers. We review your material data with you.
Review with us
Phthalic anhydride, maleic anhydride, flakes and briquettes
Anhydrides have product-specific safety requirements. We review them with you.
Also tested in our lab:
Send us your material data and we will review the right solution with you:
Product Check
Type in your product or any other bulk material to see whether it has already been tested in our lab. The list covers 287 bulk materials.
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Service in the U.S.
With more than 40 years of experience in silo engineering, we support your PTA or adipic acid silo project from the first design discussion to commissioning. We deliver to every U.S. state and install with our own qualified personnel.
FAQ
Answers to the questions plant managers, engineers, and buyers ask most often about storing terephthalic acid, adipic acid, and related monomers in silos.
Yes – in a properly designed silo. These products are on our list of bulk materials tested in our lab:
Isophthalic acid, nylon salt, sebacic acid, anhydrides, and other monomers we review with you based on your material data.
We build silos exclusively in aluminum and stainless steel – never in coated carbon steel. Which material and which design fit depends on the product, its acidity and moisture, your process, and your site. We define them with you based on your product data.
A mass-flow hopper geometry keeps the entire silo content moving. Discharge aids such as PW SpeedBlow air fluidization and bin activators break up bridges and keep the outlet clear. Storage conditions for your site we clarify with you.
Integrated filters and PW FilterLine dust collectors separate dust during pneumatic filling and conveying. Filter size and venting are matched to your filling rate and your product. Explosion protection we review with you where your product requires it.
In mass flow, the entire silo content moves downward when material is discharged – not just a channel in the center. Your PTA and adipic acid leaves the silo in the order it came in (first in, first out), and no product is left behind in dead zones. Our PW StoreLine silos are designed for concentric mass-flow discharge without asymmetric flow zones.
Yes. We design silos for raw materials such as PTA and adipic acid as well as for PET chips and polyamide pellets – as dedicated silos or PW StoreLine multi-compartment silos that keep products separate.
The right size depends on your daily consumption, delivery intervals, the number of products, and the space available at your site. PW StoreLine silos are available in a wide range of sizes and diameters, and silos too large for road transport are assembled on site. We size the system with you – without oversized investment.
Yes. We deliver to every U.S. state and support your project with silo transport, field assembly, silo installation and supervision, and site relocation of existing systems.
Very likely. Our silo systems are designed for nearly all free-flowing, granular, and powdered bulk solids. Send us your material details – particle size, bulk density, moisture, and how the product is filled and discharged – and we will review the right storage solution with you.
Tell us about your products, required storage capacity, how the silo is filled and discharged, and your site conditions. Based on this, we work out the material, silo type, and configuration with you and send you a detailed quote.
