Stirring Assembly / Mixing Reactor

Industrial Glassware & Reaction Engineering

Glass Reaction Stirring Assemblies & Drives

Goel Glass manufactures high-torque, chemical-duty Stirring Assemblies and Mixing Drives engineered specifically for agitated glass reactors, kilo-labs, and pilot-scale chemical process vessels. Combining precision Borosilicate Glass 3.3 or PTFE-encapsulated stainless steel shafts with variable-speed drives and sanitary mechanical seals, our agitation systems deliver efficient hydrodynamic mixing, rapid mass transfer, homogeneous solid suspension, and uniform heat dissipation without metallic contamination.

Core Agitator Design & Configuration Options :
  • Shaft Material of Construction: Precision-ground solid Borosilicate Glass 3.3, Stainless Steel (SS304/SS316), or high-torque virgin PTFE-lined steel core shafts providing maximum rigidity and superior corrosion immunity against aggressive acids and solvents.
  • Interchangeable Impeller Geometries: Pitched PTFE blades for low-shear axial flow, vortex stirrers for rapid dissolution, high-efficiency propellers for viscous mixing, and anchor agitators with PTFE wall-wiping blades for high-viscosity thermal transfer.
  • Drive Motors & Speed Regulation: ATEX/flameproof (Ex-d) or standard industrial electric gear motors with Variable Frequency Drives (VFD) for continuous speed regulation from 0 to 450 RPM, as well as pneumatic air motors.
  • Shaft Sealing Systems: Dual-lip PTFE bellows seals for high-vacuum service or precision sanitary mechanical seals rated for full vacuum down to 1 mbar and positive pressures up to +0.5 bar(g).
Key Engineering Features
  • High chemical resistance against acids, halogens, and organic solvents with pure Borosilicate 3.3 and virgin PTFE wetted contact parts (see Technical Information)
  • Zero-leakage sanitary mechanical and magnetic seal options for high-vacuum synthesis
  • Flexible chuck and vibration-dampening couplings protecting glass vessel necks from shear forces
  • Custom shaft lengths and multi-tier blade configurations for vessels from 5L to 500L
  • Integrated digital tachometer and continuous torque monitoring capabilities
Industrial Applications
  • Active Pharmaceutical Ingredient (API) crystallization and synthesis
  • Aggressive acid digestion and halogenated organic chemical reactions
  • Polymerization, resin preparation, and emulsion blending
  • Pilot-scale liquid-liquid extraction and heterogeneous catalysis
  • High-viscosity slurry agitation and solid-phase peptide synthesis

Stirrers are assembled securely in a vessel using an alignment chuck, seal housing, and glass reducing adaptor. Standard dimensional configurations for vessels from 20L to 100L are tabulated below:

Brochures

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SIZE A B C D L
20 L 250 150 450 25 825
50 L 300 200 600 50 1050
100 L 300 250 700 50 1200

Chuck & Seal Assemblies

Goel Glass Chuck & Seal assemblies provide hermetic, leak-proof rotary shaft sealing designed specifically for glass reaction vessels operating under deep vacuum or slight positive pressure. Built exclusively with Borosilicate Glass 3.3 and virgin PTFE wetted components, process fluids never contact metallic parts. Flexible PTFE bellows seals provide vacuum sealing down to 1 mm Hg absolute, while sanitary mechanical seals are rated for high-vacuum synthesis down to 1 mbar and permissible vessel operating pressures. A precision-ground glass reducer connects the chuck assembly to the center neck of the reactor cover.

CAT.REF. BELLOW SEAL CAT.REF. MECHANNICAL SEAL VESSEL DN L L1 D
CSA1* CSM1* 20 L 50 300 250 25
CSA1.5* CSM1.5* 50,100,200 L 80 360 300 47

Stirrers with PTFE Impeller Blades

Designed for gentle axial liquid circulation and rapid homogenization of low-to-medium viscosity fluids. The solid virgin PTFE blades can be folded for insertion through narrow vessel necks and self-expand to full operating diameter once inside the reactor body.

CAT.REF. VESSEL L L1 L2 L3 D D
STB10 10 600 300 15 175 25 100
STB20 20 825 300 25 200 25 100
STB50* 50 1050 300 25 200 47 150
STB100* 100 1200 300 30 250 47 175

Vortex Stirrers

Engineered to generate a deep central fluid vortex for rapid dissolution of powdered solids, fast gas-liquid dispersion, and homogeneous blending of low-viscosity liquid systems containing fine particulate matter.

CAT.REF. VESSEL L L1 L2 D D
STV50 50 1050 300 50 47 95
STV100 100 1200 300 65 47 140

Propeller Stirrers

Featuring precision-angled curved blades that generate powerful axial and radial thrust, making them ideal for high-viscosity reaction media, intense bottom-to-top fluid turnover, and keeping dense solid slurries in continuous suspension.

CAT.REF. VESSEL L L1 L2 D D
STP50 50 1050 300 50 47 95
STP100 100 1200 300 65 47 145

Complete Stirring Assembly with Mechanical Seal

A turnkey agitation package incorporating a glass stirrer shaft, sanitary single or double mechanical seal, drive chuck, and glass reducer. Engineered for plug-and-play installation on glass reactor lids under stringent cGMP and high-vacuum conditions. The complete assembly comprises:

GLASS STIRRER STB / STV / STP
Chuck and mechanical seal CSM
Reducer PR
CAT. REF. FOR VESSEL STIRRER USED CHUCK & SEAL REDUCER USED
STBM20 20L STB20 CSA1 PR4/2
STBM50* 50L STB50 CSA1.5 PR6/3
STBM100* 100L STB100 CSA1.5 PR9/3

Stirring Assembly with PTFE-Lined Stainless Steel Core

Engineered for high-torque applications, long shaft spans, and high-density slurries where glass shafts risk flexural stress. A high-tensile stainless steel inner core provides torsional strength, encased in a seamless, heavy-wall virgin PTFE sheath for total corrosion immunity.

CAT. REF. FOR VESSEL STIRRER USED CHUCK & SEAL REDUCER USED
STBM20/P 20L SS PTFE LINED CSA1 PR4/2
STBM50/P 50L SS PTFE LINED CSA1.5 PR6/3
STBM100/P 100L SS PTFE LINED CSA1.5 PR9/3

Variable Frequency Drive (VFD) & Motor Speed Control

Precision electric motor drives available in standard safe-area or certified flameproof / explosion-proof (Ex-d) enclosures. Integrated digital VFD controllers enable infinitely variable agitation speed regulation (50 to 450 RPM) with soft-start acceleration, constant torque, and digital tachometer feedback.

CAT.REF. PHASE TYPE
VFD 0.5* 3 VFD
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