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Rotary Evaporator Only Information

Rotary Evaporator Only Information

3 temperatures, but it is a general recommendation to help give an idea of the temperatures for the rotary evaporator. Many manufacturers do not recommend a water bath temperature higher than 60 degrees Celsius, but

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Lyophilization vs. Freeze Drying: What is Lyophilization?

Lyophilization vs. Freeze Drying: What is Lyophilization?

About 95% of the water in the material is removed in this phase. Primary drying can be a slow process. Too much heat can alter the structure of the material. Secondary Drying (Adsorption) Phase. Lyophilization’s final phase is secondary drying (adsorption), during which the ionically-bound water molecules are removed.

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How does a Rotary Evaporator Remove Solvent? - Rotovap

How does a Rotary Evaporator Remove Solvent? - Rotovap

Aug 09, 2019 Fill the rotovap cold traps with dry ice. Attach a glass “bump trap” to prevent any solution from entering the main part of the rotovap. Secure with a clip. Connect the flask and bump trap to the adaptation part with a clip. Lower the flask into the water bath, preventing the flask from disconnection. 2.

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Remove Residual Water - University of Rochester

Remove Residual Water - University of Rochester

Celite: Sometimes it is useful to filter small scale reactions through Celite to remove trace water. High vacuum: Placing a sample on the high vacuum line for a hour, or overnight (depending on the compound) sometimes removed residual water. Azeotroping: Often traces of a high boiling solvent or other impurity can be removed from a product or ...

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Buchi 20/40/60 rule for Rotary Evaporators

Buchi 20/40/60 rule for Rotary Evaporators

Doc: CHEMFS rotovap pressure-temp Custodian: Dept. Chem. School Safety Coordinator Page 1 of 1 Created: Feb 2005 Last Review : Dec 2010 Next Review: Dec 2013 Buchi 20/40/60 rule for Rotary Evaporators Optimal Distillation parameters for a rotary evaporator vary according to solvent in use: 1. Set water ...

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Home Environmental Health Safety UCI

Home Environmental Health Safety UCI

For example, ethers (glyme, THF, diethyl ether, dioxane) can form explosive peroxides when exposed to air, stored for an extended period of time, or upon concertation. Never isolate peroxides, azides, acetylides, nitro-containing compounds, molecules with strain energy, or thermally unstable compounds using a rotovap, this can lead to a fire or ...

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Carboxylic Acid to Thioamide Hydrogen Bonding. - Abstract

Carboxylic Acid to Thioamide Hydrogen Bonding. - Abstract

Jan 01, 2009 The THF solvent was removed (rotovap), the residue was dissolved in CH 2 Cl 2, and the solution was passed through a short column of silica gel (filtration chromatography), using CH 2 Cl 2 as eluent. The product was further purified by radial chromatography using CH 2 …

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Carboxylic acid to thioamide hydrogen bonding

Carboxylic acid to thioamide hydrogen bonding

Jan 03, 2009 THF solvent was removed (rotovap), the residue was dissolved in CH 2 Cl 2, and the solution was passed through a short column of silica gel (filtration chromatography), using CH 2 Cl 2 as eluent. The product was further purified by radial chromatography using CH 2 …

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THF evaporation under partial vacuum Physics Forums

THF evaporation under partial vacuum Physics Forums

Jun 23, 2012 The rotovap connected to a dynamic, regulated vacuum source is the best application for your needs ... (of course H2O and THF act in a strongly hydrogen bonding non-ideal fashion, so the exercise is just a back of the envelope set of calculations;-) ... Ideal gas law for the 1 L volume of 24 torr gas gives way to determine the amount of mass ...

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To Grease or Not to Grease Blog

To Grease or Not to Grease Blog

May 04, 2017 Here, grease is needed to improve the seal and allow for the pressures required to remove that solvent. Just make sure to clean it for the next user! Similarly, poorly functioning vacuum systems might require a better seal to obtain pressures needed to remove lower boiling solvents and will also benefit from greased glass joints.

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Experimental - websites.umich.edu

Experimental - websites.umich.edu

Rotovap (rotary evaporator) is a laboratory device used for the removal of solvents from samples by evaporation. ... (360 mg, 9 mmol) and 20 mL of THF under argon at 0C. A solution of compound 7 (920 mg, 3 mmol) in 5 mL of THF was injected slowly into the flask. Thirty minutes later, 18-crown-6 (780 mg, 3 mmol) was added.

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Rotovap Startup - csustan.edu

Rotovap Startup - csustan.edu

Rotovap Shutdown 1. Raise unit out of water bath. 2. Open pressure valve on condenser unit. 3. Turn off vacuum pump. • Always vent to atmospheric pressure before turning off vacuum pump! • This is the same for any vacuum system. 4. Turn off rotary spinner. 5. Remove flask. 6. Turn off water bath and chiller unless you plan to use again in ...

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Solvent Removal -

Solvent Removal -

Solvent Removal. It is often necessary to remove solvent from a solution to recover either a solid or a high-boiling liquid. There are several ways to do this. ... The motor in the rotovap turns the flask rapidly, providing a greater surface from which evaporation can occur and speeding up the process. Cooling coils in the rotovap condense the ...

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Rotovap - Dartmouth College

Rotovap - Dartmouth College

The purpose of the rotovap is to remove low boiling organic chemicals, usually solvents, from a mixture of compounds. The rotary evaporator is the method of choice for solvent removal in the modern organic laboratory. The solvents or low boiling compounds are removed by a simple distillation. The rotovap is designed to be operated under a ...

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Peroxide Explosion Injures Campus Researcher

Peroxide Explosion Injures Campus Researcher

The researcher was using a rotary evaporator (rotovap) to remove organic solvents from an azobenzene precipitate. She adjusted the bottom flask which then exploded sending glass towards ... In this case, the THF used did not contain a stabilizer (such as BHT) to slow the rate of peroxide formation and the four-liter bottle was nearly empty. A ...

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Operation of the Rotary Evaporator (Rotovap)

Operation of the Rotary Evaporator (Rotovap)

The rotovap itself consists of the following parts: a) a long condenser containing a distillation tube surrounded by a coil of glass tubing. This glass tubing will have cold water running through it to provide a cooling atmosphere for the gas as it is being distilled. ... DO NOT REMOVE the flask by pulling straight downwards; this can result in ...

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