stirred tank reactors

There’s a reason chemists have relied on glass reaction vessels since the earliest days of organic synthesis: glass lets you watch the reaction happen. Color changes, phase separations, crystallization onset, reflux behavior, foaming, gas evolution — all of it is visible in real time with a glass reactor, in a way that no opaque stainless steel vessel can match. Combine that visual transparency with modern jacketed temperature control, precision agitation, and modular glassware components, and you have one of the most versatile pieces of equipment in any chemistry lab, pilot plant, or process development facility.

We manufacture a complete line of glass reactor vessels — from single-jacketed bench units to fully automated, multi-neck jacketed glass reactor systems designed for continuous process development, kilo-lab scale-up, and specialty chemical production.

What Is a Glass Reactor?

A glass reactor is a chemical reaction vessel constructed from high-purity borosilicate glass, used to carry out synthesis, crystallization, extraction, distillation, and other unit operations under precisely controlled temperature conditions. Unlike a simple round-bottom flask, a true glass reactor system integrates:

• A jacketed vessel for circulating heating or cooling fluid around the reaction mass
• A multi-neck lid with ports for agitation, condensers, addition funnels, thermometers, and sampling
• A mechanical or magnetic stirrer for controlled mixing
• Sealing systems (PTFE gaskets, ground-glass joints, or clamped flanges) that maintain a closed, often inert, reaction environment
• Optional vacuum-rated construction for distillation and solvent recovery under reduced pressure

Because glass is chemically inert to nearly all reagents except hydrofluoric acid and strong hot alkalis, a glass reactor vessel provides broad chemical compatibility without the risk of metal ion contamination — a critical consideration for pharmaceutical intermediates, high-purity specialty chemicals, and any process where product purity cannot be compromised by trace metal leaching.

Why Chemists and Process Engineers Choose Glass Reactors

Full Visual Process Control

The single biggest advantage of a glass reactor over a stainless steel vessel is visibility. You can directly observe:

• Color changes that signal reaction progress or completion
• Crystal formation and growth during cooling crystallization
• Phase separation in biphasic or emulsion systems
• Foaming or gas evolution that might otherwise go unnoticed
• Solids suspension quality and mixing homogeneity

This visual feedback is invaluable during process development, troubleshooting, and scale-up, letting chemists catch problems — or opportunities — that would be completely invisible inside an opaque metal reactor.

Broad Chemical Compatibility

Borosilicate glass resists attack from acids, most organic solvents, halogens, and oxidizing agents far more broadly than even high-grade stainless steel. This makes a glass reactor vessel the preferred choice for:

• Strong acid and oxidative reactions
• Halogenation and other corrosive-media chemistries
• High-purity pharmaceutical intermediate synthesis
• Any process where metal contamination would compromise product quality

Precision Temperature Control via Jacketing

A jacketed glass reactor allows heating or cooling fluid to circulate through an outer glass jacket surrounding the reaction vessel, giving you tight, uniform temperature control across the full working range — typically from around -80°C (with appropriate cryogenic fluid) up to 200°C or higher depending on jacket design and fluid selection. This is essential for:

• Exothermic reactions requiring rapid heat removal to prevent runaway
• Cryogenic reactions requiring stable sub-zero temperatures
• Reflux operations at controlled, repeatable temperatures
• Crystallization processes requiring precise, programmed cooling ramps

Modular, Configurable Design

Unlike a fixed stainless steel reactor, a glass reactor system is built from modular, interchangeable glass and PTFE components — lids, condensers, addition funnels, dip tubes, thermowells — that can be reconfigured for different experiments without purchasing an entirely new vessel. This modularity is a major reason Chemglass reactor systems and similar modular platforms have become a standard fixture in academic, pharmaceutical, and specialty chemical R&D labs worldwide. and internals, optional explosion-proof electrical components, and geometry designed to scale predictably into full-size stainless steel chemical reactor systems later.

Our Glass Reactor Product Line

Jacketed Glass Reactor Systems

Our jacketed glass reactor line is built around a double-walled borosilicate vessel that circulates heat transfer fluid (water, glycol, or silicone oil, depending on your temperature range) between an inner reaction chamber and an outer glass jacket. Available in single-jacket and higher-performance dimpled-jacket designs for improved heat transfer efficiency, these reactors are the workhorse configuration for most synthesis and process development applications.

Key specifications:

• Capacities from 1 liter to 200 liters (custom sizes available on request)
• Temperature range from approximately -80°C to 200°C, depending on jacket fluid and heating/cooling circulator
• Single, double, or triple-wall jacket options for enhanced insulation or vacuum-jacketed thermal efficiency
• PTFE or glass stirrer shaft options, compatible with overhead mechanical stirrers
• Multi-neck lids (3-neck, 4-neck, 5-neck configurations) for flexible port assignment

Glass Reactor Vessel — Standard and Custom Configurations

For applications that don’t require jacketed temperature control, or where an external heating/cooling bath is preferred, our standard glass reactor vessel line offers single-wall borosilicate construction in the same range of capacities. These vessels are ideal for:

• Ambient-temperature reactions and mixing operations
• Applications using an external heating mantle or cooling bath
• Cost-sensitive lab setups where jacket circulation isn’t required
• Simple extraction, filtration, or crystallization operations

Chemglass-Style Modular Reactor Systems

Many labs standardize their glassware around the modular design philosophy popularized by Chemglass reactor systems — a widely recognized approach to lab-scale glass reaction equipment built on interchangeable, standard-taper ground-glass joints and modular component libraries. We manufacture fully compatible modular glass reactor components, including lids, condensers, addition funnels, and jacketed vessels, engineered to standard joint sizes so they integrate seamlessly with existing Chemglass-style setups or serve as a complete standalone system for labs building out new glass reactor infrastructure.

Why modular compatibility matters:

• Labs can mix and match components across vendors without being locked into a single supplier
• Replacement parts (condensers, stirrer guides, thermowells) are easy to source and standardize
• New configurations can be assembled quickly for different experiments without re-purchasing an entire system
• Standard-taper joints ensure reliable, leak-free connections across your entire glass reactor setup

Kilo-Lab and Pilot-Scale Glass Reactor Systems

As processes move from bench-scale development toward scale-up, we offer larger-capacity jacketed glass reactor systems — typically from 20 liters up to 200 liters — engineered for kilo-lab and small pilot-plant production. These systems retain the visual process control and chemical compatibility advantages of glass while incorporating more robust support frameworks, larger-capacity circulators, and heavier-duty agitation drives suited to extended production runs.cleaning agents and any incidental contact chemistries — before recommending a material specification, since a reactor is only as reliable as its weakest wetted component.

Construction Materials and Glass Grades

Borosilicate Glass 3.3

The overwhelming majority of glass reactor vessels — including our full product line — are manufactured from borosilicate glass 3.3 (equivalent to Pyrex/Duran-type glass), chosen for its:

• Excellent thermal shock resistance, tolerating rapid temperature changes without cracking
• Low coefficient of thermal expansion, maintaining dimensional stability across wide temperature swings
• Outstanding chemical resistance to acids, halogens, and most organic solvents
• High optical clarity for unobstructed visual process monitoring

Sealing and Gasket Materials

Ground-glass joints provide the primary seal between reactor components, often reinforced with PTFE sleeves for leak-free, non-stick performance that resists sticking even after prolonged exposure to aggressive reagents. Vessel-to-lid seals typically use PTFE or Viton O-rings and gaskets, selected based on your specific chemical compatibility and temperature requirements. Stainless steel or PTFE-coated clamps secure the flange connection between the vessel body and lid, maintaining a reliable seal even under vacuum or mild positive pressure.

Stirring and Agitation Systems

Our glass reactor systems support several agitation configurations:

Variable-speed digital stirrer controllers for precise, repeatable mixing intensity across experiments

PTFE-bladed stirrers on a glass or PTFE-coated shaft, driven by an overhead mechanical stirrer motor, suitable for most general-purpose mixing

Anchor or paddle impellers for higher-viscosity media or wall-scraping applications

Magnetic stirring options for smaller-volume vessels where a sealed, drive-free mixing solution is preferred

Temperature Control: Jacketed Glass Reactor Configurations in Detail

Single-Jacket Design

The standard configuration for most jacketed glass reactor systems, a single glass jacket surrounds the reaction vessel, circulating heat transfer fluid supplied by an external heating/cooling circulator. This design offers reliable, cost-effective temperature control suitable for the majority of synthesis and crystallization applications.

Dimpled Jacket Design

For applications requiring faster heat transfer response — particularly rapid cooling of highly exothermic reactions — a dimpled jacket design increases the fluid flow velocity and turbulence against the vessel wall, improving heat transfer coefficients compared to a smooth single jacket.

Vacuum-Insulated Double Jacket

For cryogenic applications or processes requiring exceptional temperature stability with minimal external heat gain, a vacuum-insulated double-jacket design provides superior thermal isolation, similar in principle to a laboratory Dewar flask, while still allowing active circulation of a heat transfer fluid in the innermost jacket layer.

Selecting a Circulator

Your choice of external heating/cooling circulator determines the practical temperature range of your jacketed glass reactor. Silicone oil-based circulators typically extend the usable range up to 200°C or higher, while low-temperature circulators using specialized heat transfer fluids can achieve temperatures down to -80°C or lower for cryogenic synthesis work. We can advise on circulator selection and glass jacket compatibility as part of your system specification.

Vacuum Operation and Distillation

Many glass reactor vessel configurations are rated for vacuum operation, making them well-suited to:

• Solvent removal and recovery under reduced pressure
• Vacuum distillation of temperature-sensitive compounds
• Degassing of reaction mixtures prior to sensitive reactions
• Rotary evaporation-style solvent stripping at larger scale than a standard rotovap allows

Vacuum-rated glass reactors require appropriately rated glass wall thickness, properly sealed ground-glass joints, and a suitable vacuum pump and cold trap configuration. Our engineering team can specify the correct glass reactor and accessory configuration for your target vacuum level and operating temperature.

Applications Across Industries

Pharmaceutical and Fine Chemical R&D

Glass reactors are the standard equipment for process chemistry labs developing and optimizing synthetic routes to active pharmaceutical ingredients and intermediates, where visual process monitoring and freedom from metal contamination are both critical.

Academic and Government Research Laboratories

University and government research labs rely on modular jacketed glass reactor systems for a huge range of synthetic and materials chemistry research, valuing the flexibility to reconfigure equipment across many different experimental programs.

Specialty and Fine Chemical Manufacturing

Small-batch specialty chemical producers use glass reactor vessels for products where visual process control, chemical purity, and flexible batch sizing matter more than the very large throughput of an industrial stainless steel chemical reactor.

Flavor, Fragrance, and Cosmetic Ingredient Production

The chemical inertness of glass makes it ideal for producing sensitive flavor and fragrance compounds and cosmetic actives, where any trace metal contamination could alter scent, taste, or stability.

Kilo-Lab Scale-Up and Process Development

Before committing to full production-scale equipment, process development teams use larger jacketed glass reactor systems to validate reaction conditions, heat transfer requirements, and mixing performance at an intermediate scale — informing the design of eventual stainless steel or Hastelloy production equipment.

Customization Options

Every research program has slightly different requirements, so we offer a wide range of customization across our glass reactor line:

Full jacketed glass reactor packages bundled with compatible heating/cooling circulators

Custom vessel capacity and neck configuration (3-neck, 4-neck, 5-neck, or custom port layouts)

Single, dimpled, or vacuum-insulated jacket designs

PTFE, Viton, or custom gasket materials for specific chemical compatibility

Bottom-drain valve options for easy product discharge

Custom stirrer shaft length and impeller geometry

Compatibility with standard-taper ground-glass joint sizes used across major modular glass reactor platforms, including Chemglass-style systems

Digital overhead stirrer controllers with programmable speed ramps and torque monitoring

Installation, Training, and Ongoing Support

Technical consultation on jacket design, circulator selection, and scale-up planning as your process moves from bench-scale glass reactor work toward larger jacketed systems or eventual stainless steel production equipment

Setup guidance for assembling multi-component glass reactor systems, including proper joint lubrication and clamp torque practices

Operator training on safe glass reactor operation, including pressure and vacuum limits, thermal shock avoidance, and proper handling procedures

Genuine replacement glassware and PTFE components, including gaskets, stirrer guides, and joint sleeves

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