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Rotary Evaporator Only Information

Rotary Evaporator Only Information

• A solvent table, below, from a large rotary evaporator manufacturer, Buchi. . correlates to a relative applied pressure of 75 torr (99 mbar). The evaporator could be run at lower temperatures that correlate to the recommended temperatures of ethanol, but 710 needs slightly

METHOD FOR THE PURIFICATION OF MALONONITRILE BY THE .

METHOD FOR THE PURIFICATION OF MALONONITRILE BY THE .

Oct 26, 1971 · The treated material was allowed to stand 30 minutes and then distilled up to 120° C. (bath temperature) and at 5 mm. pressure on a rotary evaporator. 48 parts remained as residue. The distillate (155 parts) analyzed 36.2 wt. percent acetonitrile, 63.0 wt. percent malononitrile and 0.8 wt. percent fumaronitrile and malononitrile.

The

The "Golden Rule" for Solvent Removal

other daily tasks. Unfortunately many rotary evaporator users forget the scientific principles of solvent evaporation. This is evidenced by pulling ultimate vacuums without control or knowledge of the pressure, the use of secondary condensers, problematic bumping and the use of bump traps.

Reversed Phase HPLC - an overview | ScienceDirect Topics

Reversed Phase HPLC - an overview | ScienceDirect Topics

Briefly, the dichloromethane extract is evaporated to dryness in a rotary evaporator, redissolved in a mixture of methanol/water/hexane (1:30:50 v/v), and subjected to liquid partitioning. The aqueous phases are then cleaned up using an immunoaffinity column containing monoclonal antibodies against aflatoxin M 1.

Solvent Removal - Organic Chemistry

Solvent Removal - Organic Chemistry

Rotary Evaporators. Rotary evaporators, or rotovaps, are standard equipment in most organic chemistry research labs. These evaporators are designed to remove solvent rapidly from solutions. In the Organic Chemistry Teaching Labs at CU Boulder, we have 5 rotovaps on carts so that we can move them to where they are needed.

Isolation and purification of fumonisin B1 and B2 from .

Isolation and purification of fumonisin B1 and B2 from .

The mycotoxins were extracted from rice culture material (RCM) with acetonitrile-water (1:1), filtered, and the acetonitrile removed on a rotary evaporator. Preparative reverse phase liquid chromatography (LC) was used to isolate and partially purify FB1 and FB2 from the extract. The extract was applied to a C18 reverse phase cartridge.

Purification of sulforaphane from Brassica oleracea seed .

Purification of sulforaphane from Brassica oleracea seed .

2.4. Preparative low-pressure column chromatography. The methanol phase containing compounds of interest was dried at 35 °C under vacuum in a rotary evaporator, and the residue was purified by preparative low-pressure column chromatography. A 500 mm × 18 mm glass tube was used as the preparative chromatography column.

Vacuum distillation - Wikipedia

Vacuum distillation - Wikipedia

Vacuum distillation is distillation performed under reduced pressure, which allows the purification of compounds not readily distilled at ambient pressures or simply to save time or energy. This technique separates compounds based on differences in boiling points. This technique is used when the boiling point of the desired compound is difficult to achieve or will cause the compound to decompose.

METHOD FOR THE PURIFICATION OF MALONONITRILE BY THE .

METHOD FOR THE PURIFICATION OF MALONONITRILE BY THE .

Oct 26, 1971 · The treated material was allowed to stand 30 minutes and then distilled up to 120° C. (bath temperature) and at 5 mm. pressure on a rotary evaporator. 48 parts remained as residue. The distillate (155 parts) analyzed 36.2 wt. percent acetonitrile, 63.0 wt. percent malononitrile and 0.8 wt. percent fumaronitrile and malononitrile.

How to use a Rotary Evaporator

How to use a Rotary Evaporator

A typical rotary evaporator has a water bath that can be heated in either a metal container or crystallization dish. This keeps the solvent from freezing during the evaporation process. The solvent is removed under vacuum, is trapped by a condenser and is collected for easy reuse or disposal.

5.5: Rotary Evaporation - Chemistry LibreTexts

5.5: Rotary Evaporation - Chemistry LibreTexts

Jun 23, 2019 · Contributors; The preferred method for solvent removal in the laboratory is by use of a rotary evaporator (also known as a "rotovap"). A rotary evaporator is essentially a reduced pressure distillation: a solution in a round bottomed flask is placed in the water bath of the apparatus, and rotated while the system is partially evacuated (by a water aspirator or vacuum pump).

Vacuum evaporation - Martin Christ Gefriertrocknungsanlagen

Vacuum evaporation - Martin Christ Gefriertrocknungsanlagen

Distillation systems and rotary evaporators use high temperatures for evaporation and operate at nearly atmospheric pressure or vacuum levels down to approximately 100 mbar. Freeze drying systems operate at very low temperatures and high vacuum down to less than 0.01 mbar.

Supporting Information - American Chemical Society

Supporting Information - American Chemical Society

acetonitrile, and a solution of p-ABSA (3.60 g, 15 mmol) in 25 mL acetonitrile was added dropwise with stirring. The reaction mixture was stirred at room temperature under air atmosphere overnight (about 10 h), and the solvent was removed under reduced pressure with a rotary evaporator. The

Your Evaporation Guide Operation Temperature difference

Your Evaporation Guide Operation Temperature difference

The performance of a rotary evaporator is limited by the input, the amount of heat that can be added to the evaporation side, and the output, the amount of heat . pared to a heating bath temperature of 40 °C. the pressure lowered in order to lower the solvents Interpretation As .

Determination of residues of deltaméthrin in wheat and .

Determination of residues of deltaméthrin in wheat and .

evaporator at 40°C. The dry residue is dissolved with 10 ml of acetonitrile (or methanol or hexane). It is then ready to be analysed. Analytical method A suitable volume (20µl) of the extract was injected into the column and eluted with a mobile phase: acetonitrile - water (92:8) V/V at a flow rate of 0.85 ml/min.

Title: Rotary Evaporator Page 1 of 6 ROTARY EVAPORATOR

Title: Rotary Evaporator Page 1 of 6 ROTARY EVAPORATOR

Rotary evaporators (also called "rotavaps" or "rotovaps") are used to remove solvents from reaction mixtures. Liquid solvents can be removed without excessive heating of the sample by lowering the pressure above a bulk liquid and thus lowering the boiling points of the component liquids in it. This

Medicinal Chemistry and Product Purification

Medicinal Chemistry and Product Purification

Removal of 360 ml of 1:1 Acetonitrile:Water from 150 mm . remove solvent using a rotary evaporator, there is now a demand for . as you lower the surrounding pressure thus less heating is required to give complete evaporation.The rapid rotation of the centrifuge

Lab Tech Guy on the acetonitrile shortage

Lab Tech Guy on the acetonitrile shortage

Apr 07, 2009 · Recycling from solvent waste is an attractive idea for obtaining acetonitrile. It is not as simple as isolating the acetonitrile using a rotary evaporator because acetonitrile forms an azeotrope with water at atmospheric pressure, thus you can not get higher than 85%. Simple distillation recyclers also have this problem.

Rotary evaporator - Wikipedia

Rotary evaporator - Wikipedia

Rotary evaporators are also used in molecular cooking for the preparation of distillates and extracts.. A simple rotary evaporator system was invented by Lyman C. Craig. It was first commercialized by the Swiss company Büchi in 1957. In research the most common form is the 1L bench-top unit, whereas large scale (e.g., 20L-50L) versions are used in pilot plants in commercial chemical operations.

Validation of HPLC method for determination of priority .

Validation of HPLC method for determination of priority .

for two more times. The pooled solvent extract was concentrated to near 1.0 ml under reduced pressure in a 40 0C water bath using a rotary evaporator (Eyela, Tokyo, Japan). Extract Cleanup Clean up of the extract is required to remove co-extracted compounds that .

Anyone familiar with HPLC/Acetonitrile Solvent Removal?

Anyone familiar with HPLC/Acetonitrile Solvent Removal?

if you put the heating bath of your rotavap to 40°C, Acetonitrile will start evaporating @ approx. 90 mbar; if the pressure decreases to about 40 mbar, the AcN is gone.

The Best Vacuum Pump for Rotary Evaporators - KNF Pump .

The Best Vacuum Pump for Rotary Evaporators - KNF Pump .

The Best Vacuum Pump for Rotary Evaporators. Four simple steps to help you choose. . methylene chloride and pentane, don't need as low an ultimate vacuum for evaporation as others, such as acetonitrile, benzene and chloroform. A relatively low ultimate vacuum is required to remove solvents with high boiling points, such as water, dimethyl .

Home Page [home.sandiego.edu]

Home Page [home.sandiego.edu]

The arm of the evaporator should be at it highest position setting (i.e. the arm is as high as it can go above the water bath) - use the controller (labeled C1) to raise/lower the arm. The solvent receiving flask (F1) is attached to the condenser using grease on the joint (only a small amount is needed) and secured in place with the metal clamp.

Solved: A Rotary Evaporator (or

Solved: A Rotary Evaporator (or "rotavap") Is Often Used I .

A rotary evaporator (or "rotavap") is often used in chemical laboratories to vaporize solvents at temperatures below the normal boiling point. Does the vaporization of acetonitrile at its adjusted boiling point under reduced pressure require a different amount of heat than the vaporization at its normal boiling point under normal pressure? Explain.

Water Evaporation | Products & Suppliers | Engineering360

Water Evaporation | Products & Suppliers | Engineering360

Description: A multiple-effect evaporator, as defined in chemical engineering, is an apparatus for efficiently using the heat from steam to evaporate water.In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last.. Application: Chemical Processing, Food Processing, Pulp and Paper Processing

Validation of HPLC method for determination of priority .

Validation of HPLC method for determination of priority .

for two more times. The pooled solvent extract was concentrated to near 1.0 ml under reduced pressure in a 40 0C water bath using a rotary evaporator (Eyela, Tokyo, Japan). Extract Cleanup Clean up of the extract is required to remove co-extracted compounds that .

How to Select a Vacuum Pump for Rotary Evaporation? - Lab .

How to Select a Vacuum Pump for Rotary Evaporation? - Lab .

Applying vacuum using a pump is either helpful or necessary in most rotovap applications as it reduces the pressure within the system. This lowers the boiling temperature of the solvent resulting in faster evaporation and safer rotary evaporator operation. When composing a rotary evaporator setup, not just any pump will be up to the task. You .

Vacuum Pump For Rotary Evaporator at Thomas Scientific

Vacuum Pump For Rotary Evaporator at Thomas Scientific

The rotary evaporator R-100 is a high-quality, entry level Rotavapor to meet the essential needs in classical laboratory applications. It is capable of a manually adjustable rotation speed of 20 to 280 rpm and equipped with an action jack lift for manual lifting of the evaporating flask. Included is.

Supporting Information - American Chemical Society

Supporting Information - American Chemical Society

TLC. After completion of the reaction (12 h), acetonitrile was evaporated on rotary evaporator. The crude product obtained was dried under high vacuum and purified by flash silica gel column using a gradient of ethyl acetate-petroleum ether (1:9) to afford nitrobenzene 10 (c) 14 mg (57%). There was 49% deuterium incorporation.

Solved: A Rotary Evaporator (or

Solved: A Rotary Evaporator (or "rotavap") Is Often Used I .

A rotary evaporator (or "rotavap") is often used in chemical laboratories to vaporize solvents at temperatures below the normal boiling point. Does the vaporization of acetonitrile at its adjusted boiling point under reduced pressure require a different amount of heat than the vaporization at its normal boiling point under normal pressure? Explain.