What’s the main differences between the range of DDPS reactors?

The three standard design series for De Dietrich glass-lined reactors are referred to as CTJ, GL, and SA.

CTJ Model Reactors - The clamped or flanged-top CTJ reactors are designed with a removable top head. This two-piece design is beneficial for processes that have a high level of cleanability demands, as the easy entry facilitates cleaning of the vessel interior. The flanges are fabricated from thick steel and are built sturdy enough to withstand warpage or corrosion brought on by rigorous process conditions. Additionally, the vessel top head (or the vessel body) can be repaired, reglassed or replaced as needed which can be quicker and easier than having to perform service on the entire vessel.

Available in 2 to 2,000 gallons, CTJs are intended for small to mid-size operations and come with the standard temperature ratings of glass-lined equipment [-20°F (-30°C) to 500°F (260°C)] and pressure allowances from 150 psig to full vacuum. Depending on your mixing objectives, you can choose from a pitch blade turbine agitator or retreat blade impeller to use in conjunction with a variable or fixed speed vertically mounted drive. (For more information on mixing components, check out our post on agitator options for glass-lined vessels)

GL Model Reactors

This model features a close-welded design without a large main opening to maximize top head strength and allow for higher pressure ratings. The GL reactor isn’t as easy to inspect or clean as a clamped-top one, but the arrangement is advantageous by eliminating the need for clamps or gaskets so there is no potential for leakage in that region of the vessel. The no-main-cover design also enables more room for additional nozzles (which always comes in handy for process instrumentation, additional baffles, and other reactor accessories).

Rated for 130 psig to full vacuum (versus 100 psig of conventional closed-welded reactors), GL closed-welded reactors are available in 300 gallons to 10,000 gallons covering a full range of mid to large production scale applications. The standard agitation consists of a GlasLock agitator with removable, repositionable blades attached to a vertically mounted fixed speed drive.

SA Model Reactors

SA reactors are rugged, heavyweight vessels with a large, j-bolted top head main cover that allows for installation and removal of one-piece agitators. They also feature narrow annulus jacket spacing that enables quick heat up and cool down. Due to the larger opening, a one-piece agitator (e.g. retreat curve impeller) is the standard choice, however, GlasLock agitators with removal blades are also available. Both options come with a vertically mounted fixed speed drive. If you are looking for a large production scale size, this reactor might be what you need – standard sizes range from 300 to 25,000 gallons, with standard glass-lined steel temperatures (as mentioned above) and a pressure rating of 100 psig to full vacuum.

Additional Options

There are even more options when you look to incorporate additional materials of construction and component upgrades to enhance your reactors performance to meet the demands of your process.

VERI Reactors

The VERI reactor series features a glass-lined steel reactor body with a solid glass cover. The combination glass/glass-lined design was developed from the pharmaceutical industry's demand for maximum purity and optimized heat and mass transfer combined with suitability for GMP use. The VERI reactor is designed for a compact layout with reduced headroom requirements, suiting the limited availability of space in most laboratories. The modular construction can be expanded to handle various special functions. The combined glass/glass-lined construction offers the strength of glass-lined steel with the visibility benefit of borosilicate glass. The VERI reactor can accommodate volumes from 16 to 100 liters with operating pressures from full vacuum to 9 psig (0.6 bar) and temperatures from -76°F (-60°C) to 400°F (200°C). The mixing system options include anchor, turbine and propeller type stirrers.

OptiMix Reactors

OptiMix is a patented reactor design that optimizes the mixing performance of glass-lined reactors by integrating three baffles on the vessel wall. This design is available for all reactor designs. Benefits of this baffle arrangement include improved CIP efficiency, enhanced heat transfer and mixing, extra nozzle space, reduction of shaft deflection, and minimization of bending loads on the agitator shaft (thus extending the life of the mechanical seal). Read this blog post for more information on OptiMix baffles versus traditional styles.

Laboratory Reactors

For bench-top testing, our smallest glass-lined reactor – the 6.3 liter Lab Reactor, allows you to test your product in De Dietrich glass-lined equipment before you scale-up. It combines the quality and strength of glass-lined steel in a small, laboratory-scale design that is built to handle a large range of process conditions. The inner vessel is rated for 580 psig and full vacuum at –20°F to 482°F. The jacket is rated for 290 psig at the same temperatures and comes standard with insulation and stainless steel sheathing.


Glass-Lined Reactor Model Comparison Chart

Looking for an easier way to sift through all of this data? Here's a quick reference chart that summarizes the main types of reactor designs and how they compare with one another.

The CTJ, GL and SA vessels are comparable in price; often the decision comes down to customer preference. In terms of design, each offers its own advantages. Many customers follow the school of thought that “the less points that need to be sealed, the better”. In this case, the GL design would be ideal. But for customers that require an oversized blade to accomplish their mixing or simply prefer a traditional one piece agitator, they may be in favor of the SA model. And from a maintenance perspective, many customers prefer the two-piece CTJ design because if the top head gets damaged, they only need to replace that and not the bottom (and vice versa). As for us, well, we are in the business of glass lining so we love them all just the same.

We’ve created our online Reactor Specification Form as a hassle-free way for you to receive a quote on your equipment, whether you are looking to make a purchase in the near future or simply scoping out some equipment for a project down the road. However, we’re happy to help you spec a reactor, so if you are more comfortable with speaking to a representative, feel free to give us a call (908-317-2585) or contact us online and we can further discuss your process needs.