Piece Parts

Rotary evaporators are typically used to remove solvents following chemical reactions. Combined with gentle heat from the evaporator bath, controlled vacuum is used to accelerate distillation. Efficient solvent distillation requires vacuum balanced to achieve sufficient pressure reduction yet not overrunning the condensing capabilities of your rotovap.

Welch Vacuum offers a wide range of vacuum pumps and systems suitable for different flask sizes, allowing you to achieve ultimate vacuum levels of 75 to 1 mbar (56.3 to 0.75 torr), and flow rates of up to 138 l/min (4.87 cfm) in your rotary evaporators. Our portfolio also includes a variety of manual and electronic vacuum regulation options, including digital controllers to ensure reliable results.

Dry Fast Chemical Duty Pumps for Rotary Evaporators

Built-in tuneable vacuum to control evaporation rate
Three vacuum levels to meet your needs
Rugged chemical duty construction to resist harsh vapors

DryFast PTFE dry vacuum pumps for rotary evaporators include essential features to ensure efficient rotary evaporation. The DRYFAST tunable vacuum adjustment allows the user to optimize the vacuum for the solvent being evaporated - see Application Note below. The tunable vacuum adjustment can also be used to stop accidental bumping/foaming.

Use tunable vacuum adjustment to increase vacuum until bubbles form in the evaporation flask “ then back off slight-ly. Decrease vacuum using tunable adjustment to eliminate bumping in the evaporation flask.

Use 9 torr (12 mbar) DRYFAST models for common solvent evaporations. DryFast Ultra models offer 2 torr (2.7 mbar) ultimate vacuum to strip DMF fast along with other high boiling point and low boiling point solvents.

The rugged low maintenance oil free pumps have PTFE heads, perfluoroelastomer valves, and fluorinated plastic wetted surfaces, making DRYFAST a durable choice for solvent, acidic and basic vapors.

Model 2014 Collegiate Single stage PTFE diaphragm pump with excellent flow for evaporations of solvents with atmospheric boiling points to 80 C. Maximum vacuum is 40 torr(53 mbar), 35 l/min. Strip ethanol at 35C

Models 2034 / 2044 Research Two stage PTFE diaphragm pumps provide tunable vacuum to 9 torr(12 mbar) “ perfect for evaporation of solvents with atmospheric boiling points to 110 C. Select Model 2044 (35 l/min) for evaporations up to 10 L flask. Strip DMF at 55C, toluene at 35C.

Models 2032 / 2042 DryFast Ultra Two stage PTFE pumps are excellent for all common evaporations, drawing a deep vacuum down to 2 torr(2.7 mbar) for solvents with atmospheric boiling points to 160 C. Distills DMF rapidly at 35 C. Select Model 2042 (35 l/min) for evaporations up to 10 L flask. Strip DMF at 35C, DMSO at 55C.

MPC Chemical Duty Pumps for Rotary Evaporators

Wide vacuum and flow range to meet your needs
Compact, user friendly design to fit in fume hood or on benchtop
Rugged chemical duty construction to resist harsh vapors

MPC PTFE dry vacuum pumps include essential features to ensure efficient rotary evaporation. With ultimate vacuum levels from 75 mbar(56 torr) to 1 mbar(0.75 torr), flow rates up to 138 l/min there is a pump for all rotary evaporator applications and sizes. All MPC models come with a gas ballast valve to han-dle high vapor loads and can be used to stop accidental bumping/foaming.

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Use 8 mbar(6 torr) MPC two stage models for common solvent evaporations. MPC three stage models offer 2 mbar(1.5 torr) ultimate vacuum to strip DMF fast along with other high boiling point and low boiling point solvents. Corrosion-resistant wetted parts have PTFE heads, PEEK valves, and fluorinated plastic wetted surfaces, making MPC a durable choice for solvent, acidic and basic vapors.

Model MPC 110 E is a 2-headed, single stage PTFE diaphragm pump with excellent flow for evaporation of solvents with atmospheric boiling points to 80C. Maximum vacuum is 50 mbar(38 torr), 16.7 lpm@50Hz. Strip ethanol at 35C

Models MPC 101 Z, 301 Z and 302 Z are 2-headed, two stage PTFE diaphragm pumps with excellent flow and vacuum for evaporation of solvents with atmospheric boiling points to 110C up to 20 liter flasks. Model 302 Z uses a patented pump head design to provide excellent ultimate vacuum to <5 mbar, with an extra high flow rate in the application critical range. Strip DMF at 55C, toluene at 35C.

Models MPC 105 T, 105 T iQ-P, 201 T and 601 T are 4-headed, three stage PTFE pumps that are excellent for all common evaporations, drawing a deep vacuum down to 2 mbar(1.5 torr) for solvents with atmospheric boiling points to 160C. Distills DMF rapidly at 35C. Select Model MPC601T for evaporations up to 20 L flask.

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Self Cleaning Dry Vacuum Systemsâ„¢ for Rotary Evaporators

The Self-Cleaning air purge cycle at the conclusion of each run maintains consistent performance and extends service intervals. This purge feature eliminates condensates in the pump™s second stage and removes volatile substances before they can solidify. This purge resets the pump diaphragms to dry startup condition, enabling consistent solvent stripping rates run after run. Solidified substances can also be abrasive to the diaphragm, impairing performance and shortening diaphragm life.

Anti-bumping / foaming feature with controlled evaporation rate
Rugged corrosion resistant PTFE construction
Self-cleaning for long life and repeatable performance

Self-Cleaning Dry Vacuum Systemsâ„¢ are complete vacuum solutions for rotary evaporation. All systems feature rugged corrosion resistant PTFE diaphragm pumps for low maintenance and long life. Optimize each solvent evaporation using handy vacuum adjustment.

Also included with all models:

Digital or analog vacuum read-out
Inlet and outlet traps to protect the pump and exhaust line from liquids
Prominent emergency "bump stop" switch for bumping/foaming control
Automatic self-cleaning purge at shutdown

The self-cleaning feature and vacuum control technology contribute to Self Cleaning Systems™ long diaphragm life. All models are 35 l/min at 60Hz (29 l/min. at 50Hz).

Model 2025 analog vacuum read-out, vacuum regulator, 9 torr(12 mbar) ultimate vacuum for fast stripping of most common rotary evaporation solvents. Fast stripping of rotary evaporator solvents with boiling point < 110C.

Model 2026 adjustable high vacuum. Analog vacuum read-out, vacuum regulator, 2 torr(2.7 mbar) ultimate vacuum for fast stripping DMF and other solvents with boiling point < 160C.

Model 2027 digital adjustable high vacuum. Digital vacuum read-out, vacuum regulator, 2 torr ultimate vacuum for fast stripping DMF and other solvents with boiling point < 160C.

Model 2028 programmable high vacuum. Five user entered programs with one or two solvents and times, keyboard or electronic dial vacuum selection, digital vacuum display with menu enabled programming, 2 torr (2.7 mbar) ultimate vacuum for fast stripping of DMF and other solvents with boiling point < 160C.