Stainless Steel Double-Layer Jacket Reactor with Low-Speed Scraping Wall Stirring for Heating & Cooling

This is a large-format stainless steel reactor built for processes where temperature control and thorough mixing are equally critical. It combines a double-layer jacket for heating and cooling with a low-speed scraping wall agitator, which makes it a practical choice for materials that tend to stick, bake onto, or coat the vessel wall.

The scraping action continuously peels product off the inner surface and returns it to the main mixing flow. That means better heat transfer, less product loss, and a more consistent batch. It is especially useful when working with viscous pastes, slurries, or heat-sensitive compounds where localized overheating has to be avoided.

We build the reactor in 304 or 316L stainless steel, depending on your process media. Welds are fully penetrated and smooth-polished on the contact side to minimize dead zones and make cleaning straightforward. The jacket is engineered for your specific heating and cooling medium, whether that is steam, thermal oil, or chilled water. The low-speed scraper system is matched to the vessel size and product rheology, not bolted on as an afterthought.

Typical applications include polymerization, resin blending, adhesive production, food concentrates, and cosmetic base preparation. It handles both atmospheric and light pressure duty. If your process runs under vacuum or requires a sealed system, the shaft seal and cover configuration can be adapted accordingly.

Technical Specifications

• Vessel capacity: customizable from pilot scale to production volumes
• Material: SS304 / SS316L
• Inner tank wall thickness: designed per working pressure and capacity
• Heating: steam / thermal oil / electric (optional)
• Cooling: jacket circulation with chilled water or brine
• Working pressure: atmospheric or custom (with proper design)
• Design temperature: per process requirements
• Stirring: low-speed scraper wall agitator with variable frequency drive
• Sealing: mechanical seal or stuffing box seal
• Surface finish: mirror polish or matte, internal and external
• Optional: CIP spray ball, pressure gauge, temperature sensor, sampling port, sight glass

Buyer\’s Check List

Before requesting a quote, it helps to have the following details ready:

• What material will be processed? Chemical name and concentration matter.
• What is the batch volume and working volume?
• What are the operating and maximum design temperatures?
• Is the process under atmospheric, positive, or vacuum pressure?
• What is the viscosity range and solids content of the product?
• Is heating, cooling, or precise temperature ramping required?
• What mixing outcome is expected? Homogeneous blend, suspension, or heat-sensitive handling?
• Are there cleaning, sealing, or compliance requirements that affect material finish or component choices?

FAQ

What is the advantage of a scraping wall stirrer over a standard anchor agitator?
A scraping wall stirrer actively removes product from the heated surface. This prevents localized burning or film formation and improves heat transfer efficiency for viscous or sticky products.

Can the reactor handle both heating and cooling in the same cycle?
Yes. The double-layer jacket allows you to switch between heating and cooling media. For processes that require rapid temperature changes, we can also discuss additional internal coils or an external heat exchanger loop.

How do I decide between 304 and 316L stainless steel?
If your product contains chlorides, acids, or saline solutions, 316L is the safer choice. For general non-corrosive applications, 304 is cost-effective. Send us your material safety data sheet (MSDS) and we can advise on material compatibility.

Is custom sizing available?
Yes. We manufacture to your required capacity, wall thickness, and dimensions. Each unit is fabricated to order, so we can adjust the design to fit your existing production line.

What about maintenance of the scraping blades?
The scraper blades are replaceable. Wear depends on the abrasiveness of your product. We recommend periodic inspection and we can supply spare blades with the unit.

To get a properly sized reactor and an accurate price, send us your process details. Include the material type and concentration, batch volume, operating temperature, pressure requirements, and your stirring expectations. That gives our engineers the information they need to recommend the right configuration for your application.