Industrial mixers

Pressure mixing reactor

Jacketed vessel with a high-torque agitator and a mechanical seal, for processes that run under pressure or vacuum for the whole batch. Built routinely between approx. 500 and 30,000 L; the design pressure is defined for each process.

Usual configurable range: approx. 500 – 30,000 L
Usual installed power: approx. 15 – 250 kW

Also known as: pressure reactor · process autoclave · pressurised mixing vessel · pressure vessel with agitator

approx. 500 – 30,000 Lvacuum or pressure

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Individually sized on your material and your process. Technical proposal and price normally within 48 hours. Delivery across the EU and the Republic of Moldova.

How it works

When the process calls for pressure, the whole construction changes. The shell is calculated mechanically for the operating regime, the lid is bolted to a flange, and the agitator shaft enters the vessel through a mechanical seal sized on process pressure and temperature — not through a packed gland, which leaks under pressure.

The agitator is chosen on rheology and on the torque demanded at the end of the batch, not at the beginning. For products that thicken considerably — resins, adhesives, polymers — the final torque can be several times the starting torque, and a gearmotor sized on the initial value stalls exactly before discharge.

The heating and cooling jacket, the condenser, the dosing ports, the instrumentation and the PLC automation are composed on the process. The design pressure is defined for each process and for the applicable certification requirements — we do not publish a single figure, because it depends on volume, material, temperature and the standards the equipment falls under.

Shell calculated for the regime

The design pressure is defined for each process and for the applicable certification requirements.

High-torque agitator

Sized on the torque at the end of the batch, when the product is at its most viscous — not on the starting torque.

Mechanical seal

The only correct solution under pressure: a packed gland leaks and becomes a source of emissions.

Vacuum or pressure

The same vessel can work in both regimes, if it is designed for both from the start.

When to choose it

The concrete situations in which this machine is the right answer — and the one in which we would point you to something else in our range.

The process runs under pressure or vacuum for the whole batch, not only during one stage.

Viscosity rises sharply during the batch and the machine has to keep torque available right through to discharge.

The vessel has to stay completely closed: either because you work with volatile solvents, or because the process does not tolerate contact with air.

You need simultaneous control of temperature and pressure, with a record per batch.

When this is NOT the right machine

If the process runs at atmospheric pressure, a vessel calculated for pressure costs significantly more without any process gain.

See Jacketed reactor with agitator

Specifications

The ranges we build routinely. Final dimensions and installed power follow from the density and viscosity of the product, the batch size and the process conditions.

Technical specifications — Pressure mixing reactor
Configurable volume	approx. 500 – 30,000 L
Product contact material	AISI 304 / 316L stainless; special materials according to the process
Design pressure	Defined for each process and the applicable certification requirements
Operating regime	Vacuum or pressure, as designed
Shaft seal	Mechanical seal, sized on pressure and temperature
Jacket	Heating and cooling, jacket or half-pipe coil
Installed power	approx. 15 – 250 kW, depending on rheology and volume
Operating temperature	Jacket for hot water, steam or thermal oil — typically up to approx. 200 °C, depending on the heating medium selected
Options	Condenser · dosing ports · instrumentation · PLC automation · load cells

The figures above are the ranges we build routinely, not construction limits. We design and manufacture any capacity, power rating and envelope to order — including below or above the ranges in the table.

Build variants

What actually changes between them — not just what they are called.

With a bolted flange lid

The usual construction under pressure. The lid can be opened for inspection and cleaning, with controlled tightening.

With a half-pipe coil instead of a jacket

A half-pipe coil welded to the outside withstands higher pressure on the heat transfer medium and gives a higher heat transfer coefficient — chosen when cooling is the limiting factor.

With anchor agitator and scraper

For products that stick to the wall: without a scraper, the deposited layer thermally insulates the jacket and temperature control is lost.

With a pressurised dosing system

Ports and pumps that introduce components without depressurising the vessel — needed when the recipe calls for additions along the way.

Where it is used

The industries we build this machine for — each with its own execution requirements.

Mixing technology

Process reactors

Frequently asked questions

Question not answered here? Write to us — an engineer replies, not a bot.

What is the maximum pressure you build?

The design pressure is defined for each process and for the applicable certification requirements. We do not publish a single figure, because it depends on volume, material, temperature and the standards the equipment falls under. Send us the process parameters and we will confirm what we can build.

Why a mechanical seal and not a packed gland?

A packed gland seals by the friction of a braided packing on the shaft. Under pressure it leaks — a little at first, then more as it wears. In a process with solvents, that means emissions in the hall and lost batch. A mechanical seal works between two lapped flat faces with a barrier fluid, and keeps its tightness under pressure.

How do you size the agitator motor?

On the torque demanded at the end of the batch. For products that thicken during the process, the final torque can be several times the starting torque. A gearmotor sized on the initial value stalls exactly before discharge, when the batch is at its most valuable.

Can it also work under vacuum?

Yes, if it is designed for both regimes from the start. Vacuum loads the shell differently from pressure — under vacuum the danger is buckling, not rupture. A vessel calculated only for internal pressure is not automatically suitable for vacuum, and the reverse holds too.