6 Factors When Choosing a Glass Reactor

A jacketed glass reactor is chosen on six checks: working volume, pressure and vacuum limits, the stirring motor and speed range, jacket circulation support, port and lid layout, and glass material with controls. We build double layer jacketed glass reactors from 1L to 100L in GG3.3 borosilicate, and each factor below resolves to a spec row.

1. What working volume do you actually need?

Volume is the first filter because it deletes most of the catalog in one move. Our double layer line runs 1L, 2L, 3L, 5L, 10L, 20L, 30L, 50L and 100L. Pick the vessel against your real batch size, not against the biggest batch you might ever run — leave headroom for foaming, vapor space and what you add through the funnel during the run.

Here is the judgment we give on the phone. If you are screening formulations at the bench, stay in the 1L–3L band; the 1L–3L double layer jacketed glass reactor with its 60–1000 r/min stir range is built exactly for that. Skip the 50L if your batch never exceeds 20L — an oversized vessel stirs poorly at low fill and wastes circulator capacity every single run. When you cross into pilot batches, the 10L–100L double layer jacketed glass reactor line with dual speed and temperature displays takes over, and the motor and funnel specs scale with it.

The full ladder, with the numbers we actually quote on:

2. Can the vessel handle your pressure and vacuum?

Read this row before anything else: every model above is rated for normal or negative pressure — no positive pressure. That is not a limitation of one product page; it is the physics of a GG3.3 borosilicate vessel. If your process needs to hold positive pressure, a jacketed glass reactor is the wrong tool, full stop, and you should be pricing stainless instead.

On the vacuum side, the whole line holds up to -0.095MPA. That covers the common vacuum jobs — solvent stripping under reduced pressure, degassing, vacuum-assisted feeding through the funnel. What matters at selection time is not the number itself but whether your process depends on it: a reaction that must boil solvent off at low temperature lives or dies on that -0.095MPA rating and on the seal condition, so state the vacuum requirement in your inquiry and we confirm it against the configuration, not against a brochure.

A short decision rule: vacuum distillation or inert-atmosphere work fits glass; any pressurized step does not. Mixed processes that alternate between the two belong in steel.

3. Does the stirring system match your batch?

Motor power and speed range decide whether your mixture actually turns over. The pattern across our line is deliberate: small vessels get high speed, big vessels get torque. The SF-1L runs a 40W motor, the 2L through 5L run 90W, and from 10L upward the motors gear down through a 1/3 reduction — 90W with reduction on the 10L–30L, 120W on the 50L, 250W on the 100L. Speed windows follow the same logic: 60-1000r/min on the 1L–5L bench units, 60-600r/min on the 10L–100L floor units.

Match this to your fluid, not to a preference. Thin, fast-mixing solutions want the top of the 1000 r/min range. Viscous masses and suspensions want low-speed torque, which is why the large vessels trade top speed for reduction gearing. If your product thickens as the reaction proceeds — polymerizations and crystallizations do this — size the motor for the worst viscosity of the run, not the starting one.

The mid-range sweet spot is the 5L double layer jacketed glass reactor, which pairs a 90W motor with a 500 ml constant-pressure funnel — enough headroom for multi-step additions without moving to floor-standing gear. One question to answer before you buy: what is the highest-viscosity moment of your process, and at what batch size? That pair of answers pins the model.

4. How will you run the jacket — chiller or heating circulator?

A double layer jacketed glass reactor is selected precisely when a jacketed vessel needs circulation support from a chiller or a heating circulator. The jacket does nothing on its own; the circulator is the thermal engine, and the reactor spec is only half the system. When we scope an order we confirm five things together: vessel volume, jacket connections, the circulation equipment, stirrer configuration and the vacuum condition. You should demand the same five-point confirmation from any supplier.

What we will not do is invent a heat-load number for your process. The circulator capacity you need depends on your reaction’s heat release, your batch mass and how fast you want to ramp — a strongly exothermic nitration and a gentle dissolution at the same 20L volume need very different circulation power. Tell us the chemistry and the target temperature profile, and we size the circulator against the jacket instead of guessing.

If you are comparing across the range, the full double layer reactor category shows which vessel volumes pair with which configurations, and our jacketed glass reactor selection guide walks the jacket-and-circulator matching in more depth.

5. Which ports and lid layout does your process need?

Ports look like a detail until you try to run a multi-step synthesis through a lid that cannot take your glassware. Start with feeding: the constant-pressure funnel scales with vessel size across our line — 100ml on the SF-1L, 125ml on the 2L, 250ml on the 3L, 500ml on the 5L, 1L on the 10L and 20L, and 2L on the 30L, 50L and 100L. The funnel should cover your largest single reagent addition without a mid-addition refill; if it cannot, say so at inquiry, because the funnel is a configuration choice, not a fixed part.

On the larger end of the sheet — the SF-100L through SF-200L parameter set — the reactor lid diameter is 340mm, with a 60# flange port reserved for stirring. A wide lid and a dedicated stirring flange matter more than they sound: they decide what condenser, thermometer and feeding assembly you can mount at the same time, and whether the stirrer seal survives continuous service.

The practical check: list every connection your process needs simultaneously — stirrer, funnel, condenser, temperature probe, vacuum take-off — and confirm the lid layout against that list before the quote, not after delivery.

6. What material and control level should you insist on?

Every vessel in the table is GG3.3 borosilicate glass, top to bottom — 1L through 100L. There is no cheaper glass hiding at the small end. That gives you the two reasons people buy glass in the first place: chemical resistance across a wide pH range and full visibility of the batch. Watching a crystallization start or a phase split form is process data you cannot get from a steel wall.

Controls differ by size, and the split is worth knowing. The 1L–5L bench units carry a single digital display showing stirring speed. From 10L up, the controller is a dual digital display showing speed and temperature together — at pilot scale you are logging both, so the panel shows both. Power supply is uniform across the line at 220V/50HZ; if your site runs a different supply, flag it in the inquiry and we confirm the electrical configuration before production.

Insist on the material grade in writing. “Borosilicate” without a grade is a marketing word; GG3.3 on the spec sheet is a commitment we sign.

When is a jacketed glass reactor the wrong choice?

Three cases, and we say this as a factory that sells glass: skip glass if any step of your process holds positive pressure — the rating across our entire line is normal or negative pressure only. Skip it if your batch size is growing past 100L per run, because that is where our glass line ends. And think twice if the vessel will live in a high-traffic area where impact risk is real; borosilicate is tough for glass, but it is still glass.

In all three cases the honest answer is a steel vessel. Our stainless steel reactor vs glass reactor comparison lays out the trade-off line by line, so you can check the decision instead of taking our word for it.

Fragen und Antworten

What is the difference between a single layer and a double layer jacketed glass reactor?

A double layer jacketed glass reactor has a jacket around the vessel that a chiller or heating circulator flows through, so you control batch temperature from outside the glass. That circulation support is the whole reason the double layer design exists — it is selected exactly when the process needs active heating or cooling during the run.

How much vacuum can a jacketed glass reactor hold?

Every model in our double layer line, from the SF-1L to the SF-100L, is rated for vacuum up to -0.095MPA. The rating applies to negative pressure only — none of the glass vessels accept positive pressure.

Which size should I choose for pilot-scale work?

Match the vessel to your real batch volume with headroom for foaming and additions. The 10L–100L band is the pilot range in our line: it adds reduction-geared motors up to 250W, a 60-600r/min speed window and dual speed-and-temperature displays, while the 1L–5L units stay on the bench at 60-1000r/min.

What power supply do these reactors need?

The standard across every model is 220V/50HZ. If your facility uses a different supply, raise it at the inquiry stage so the electrical configuration is confirmed before the unit is built.

What should I send a manufacturer to get an accurate recommendation?

Send five things: your vessel volume, jacket connection needs, the circulation equipment you plan to use, your stirrer configuration and your vacuum condition. Those five answers let us confirm a model against a spec row instead of guessing. Common questions are also collected on our FAQ page.

The short version.

Work the six factors in order. Pin the batch volume first — it deletes most of the ladder. Check the process against the -0.095MPA vacuum and no-positive-pressure rating. Size the motor for your worst-case viscosity, not your starting fluid. Plan the jacket and circulator as one system. List every port your process needs at once. Then confirm GG3.3 glass and the control level in writing.

Bring us those answers and we will point you at the exact SF model and configuration — the goal is a spec sheet you can verify line by line, not a recommendation you have to trust.