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Reflux - Wikipedia

Reflux in industrial distillation. The term reflux is very widely used in industries that utilize large-scale distillation columns and fractionators such as petroleum refineries, petrochemical and chemical plants, and natural gas processing plants.. In that context, reflux refers to the portion of the overhead liquid product from a distillation column or fractionator that is returned to the .

The Lab » The Veige Research Group » University of Florida

Rotovap Buchi Collegiate Rotoary Evaporator, with water bath, and cold-finger assembly. IR: Useful Links UF NMR Facility UF X-Ray Facility . Acetonitrile, Toluene, Hexane, DME, and Pentane. HPLC Waters 1525EF Binary HPLC Pump, with Waters 2487 Dual-Wavelength Absorbance Detector, and Waters In-Line Degasser AF unit.

Removing DMF : chemistry - reddit

Try doing the reaction in 1:1 acetone:water Emulsion next time, works nicely for me, then you can rotovap off the acetone, and extract with an organic solvent like Ether. level 1. 7 points · 6 years ago. . If you mean an alternate reaction solvent, acetonitrile is the .

Kinetic Intermediates in Amyloid Assembly

at 20 mL/min starting at 20% acetonitrile and ending with 55% acetonitrile over 35 min. After removing acetonitrile in rotovap, the peptide fractions were frozen and lyophilized to yield a peptide powder that was stored at 4°C in a vacuum desiccator. Product mass was confirmed by

Buchi R-200/R-210 Rotavapor

Acetonitrile 82 35 Chloroform 61.2 30 Cyclohexane 80.74 30 Dichloromethane 39.6 25 Ethanol 78 35 Ether 34.6 20 Ethyl Acetate 77.1 35 Methanol 64.7 30 Pet Ether 40-60 40-60 20 Pet Ether 60-80 60-80 25 Toluene 110.6 45 Water 100 45 Coil condenser Air bleed tap Flask clip Angle adjuster Rotation control .

Rotovaps.net | The Largest Selection of Rotary Evaporators!

Rotovaps.net makes finding the best Rotary Evaporator for your lab easy! Great selection, expert support, and tools to help you make the right choice.

Quantification and Purification of Mulberry Anthocyanins .

Dec 01, 2004 · The following solvents in water with a flow rate of 1 mL/min were used: A (1.5% phosphoric acid) and B (1.5% phosphoric acid, 20% acetic acid, 25% acetonitrile). The elution profile was a linear gradient elution with 25%–85% solvent B in solvent A for 100 minutes.

Title: Rotary Evaporator Page 1 of 6 ROTARY EVAPORATOR

Acetonitrile 75-05-8 81 2 IB 2, 3, 0 highly flamm., serious eye irritation DCM 75-09-2 40 none none 2, 0, 0 possible carc., specific organ toxicity Chloroform 67-66-3 61 none none 3, 0, 0 possible carc./terat., toxic if inhaled Diethyl Ether 60-29-7 35 -40 IA 2, 4, 0 extremely flamm. liquid and vapor

Pressure-Temperature Nomograph Interactive Tool | Sigma .

Calculate a boiling point or pressure using the Antoine Equation: The Pressure-Temperature Nomograph is a graphical application of the Clausius-Clapeyron Equation, which assumes the heat of vaporization is a constant over a pressure range.

Home Page [home.sandiego.edu]

Acetonitrile: 82. 8-15. Diethyl ether: 35-28-55. Ethanol: 78. 19-6. Ethyl acetate: 77. 9-14. Hexanes: 69-2-26. Methanol: 65. 5-17. Toluene: 110. 30. 4. . See pictures of Rotovap #1 and #2 on right for reference to labels in the instructions below. 1. Make sure all joints are clean and free of any particulate (grit, sand) as the latter will .

Solvent Removal - Organic Chemistry

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 vapors and drop them into a collection flask so that they can be recycled or properly disposed. The roto-vap is connected to a vacuum source, and again, this speeds .

Peptide Synthesis - What do you need to get started?

Bringing peptide synthesis in-house requires some careful consideration. Read more to get a glimpse of what you'll need to get started.

Acetonitrile | CH3CN - PubChem

Acetonitrile is the chemical compound with the formula CH3CN. This colourless liquid is the simplest organic nitrile . It is produced mainly as a byproduct of acrylonitrile manufacture. It is used as a polar aprotic solvent in organic synthesis and in the purification of butadiene.

Preparing Anhydrous Reagents and Equipment | Protocol

For common solvents such as dichloromethane (DCM), acetonitrile, or toluene a storage time of 24 h over 3-Å molecular sieves with 10% m/v is sufficient to reach very low ppm values for residual water content (0.1–0.9 ppm). Tetrahydrofuran (THF) on the other hand should be dried for a duration of 3 days using 20% m/v of 3-Å molecular sieves .

Test Material: Methoxyfenozide

residues were eluted with 40 mL of 40% acetonitrile/water under vacuum. The eluate was transferred to a 500-mL flask with a methanol rinsing. After 100 mL of n-propanol was added, the eluate was reduced to dryness using a rotovap (evaporation details were not reported). The residue was reconstituted in 2.5 mL of 52% acetonitrile/water.

Study of the BMIM-PF6: Acetonitrile binary mixture as a .

hot from the Rotovap) into a high vacuum chamber overnight in order to remove any excess ethyl acetate. The BMIM-PF6 product was colorless to very slightly yellow. Infrared and NMR spectra of the melt indicated a high degree of purity with respect to organic side-products and water. 2.2. Binary mixtures of acetonitrile and BMIM-PF6

Erowid Chemistry Vaults : Organic Solvents Table of Properties

Notes: "M" in the water solubility column means completely Miscible in water. The values in the table below except for relative polarities have been extracted from MSDS compilations (see section II-B-4 of the Chemistry Webercises Directory) or the ChemFinder Web Server.Values for relative polarity have been extracted from: Christian Reichardt, Solvents and Solvent Effects in Organic Chemistry .

Evaporator Archives | BioChromato

Evaporation is an integral part of chemistry research and the de facto instrument is the Rotary Evaporator, also referred to as Rotovap. As much as they are commonly used for concentrating solvents, they also have a reputation for issues that include bumping and annihilating substances, slow evaporation, especially for DMSO / DMF and other high-boiling point substances and difficulty working .

How to use a rotary evaporator? - Lab Instrument Manufacturer

Rotary evaporator (also called "rotavap") are used to remove solvents from reaction mixtures and can accommodate volumes as large as 3 liters. They are found in almost every organic laboratory, since they allow performing this task very quickly. A typical rotary evaporator has a water bath that can be heated in either a metal container or crystallization dish.

TAK-243 – All About Drugs

Acetonitrile (61 L) was added over 30 min maintaining the temperature between 75-80°C. The pale brown suspension was stirred at 80°C for 90 min, then it was cooled to 20°C over 2.5 h. The mixture was stirred for 12 h at 20°C. The mixture was transferred in a pressure filter. The filter cake was washed twice with acetonitrile ( 18 L).

Buchi R-200/R-210 Rotavapor

Acetonitrile 82 35 Chloroform 61.2 30 Cyclohexane 80.74 30 Dichloromethane 39.6 25 Ethanol 78 35 Ether 34.6 20 Ethyl Acetate 77.1 35 Methanol 64.7 30 Pet Ether 40-60 40-60 20 Pet Ether 60-80 60-80 25 Toluene 110.6 45 Water 100 45 Coil condenser Air bleed tap Flask clip Angle adjuster Rotation control .

Types of Solvent Evaporators - An Overview | BioChromato

Jul 30, 2018 · A rotary evaporator (rotovap) works by placing the sample under vacuum thereby lowering the boiling point of the solvent. Typically, a round bottom flask is used where it is lowered in a heated water bath. The flask is rotated to increase the surface area and provide an even transfer of heat.

How can you extract a compound from a solvent when the .

May 08, 2007 · I want to extract a compound from acetonitrile (boiling point ~ 80 C) but the melting point of the compound is 60-65 C. Can you use simple evaporation (RotoVap.

How to Make Anhydrous Ammonium | Sciencing

Pure ammonia is sometimes referred to as anhydrous ammonia to distinguish it from aqueous solutions of ammonia. For example, ammonia is actually a solution of at least 90 percent water and less than 10 percent ammonia (NH3). Ammonia has many applications and is one of the most commonly manufactured inorganic .

Test Material: Methoxyfenozide

residues were eluted with 40 mL of 40% acetonitrile/water under vacuum. The eluate was transferred to a 500-mL flask with a methanol rinsing. After 100 mL of n-propanol was added, the eluate was reduced to dryness using a rotovap (evaporation details were not reported). The residue was reconstituted in 2.5 mL of 52% acetonitrile/water.

Supporting Information Toll-like Receptor 7 Selective .

on a Rotovap, and the residue was re-dissolved in RNAase-free water. Desalting The SIMRA compound solution was desalted on a 6 ml tc-18 Sep-Pac column (Waters Corporation, Milford, MA) preconditioned with acetonitrile and 0.3 M sodium acetate. After solution ran through column, 20 ml water was added to wash the column followed by 1.5 ml of

Lab Evaporators: Recycling Solvents | Lab Manager

Reagent acetonitrile will set you back about 60 per liter, but upgrading to HPLC grade will cost 30 more per liter. Add to these costs the price of disposing spent solvent, and the argument for recycling becomes compelling. . Looking Beyond the Rotovap for Evaporator Selection. 2018 Evaporator Survey Results 2018 Evaporator Survey Results.

Solvent Boiling Points Chart

Solvent Boiling Points Chart (all boiling points at standard pressure) Solvent Boiling Point (°C) Solvent Boiling Point (°C) Acetic Acid 118.0 Ethyl Acetate 77.1 Acetic Acid Anhydride 139.0 Ethyl Ether 34.6 Acetone 56.3 Ethylene Dichloride 83.5 Acetonitrile 81.6 Ethylene Glycol 197.5 Benzene 80.1 Heptane 98.4 iso-Butanol 107.7 n-Hexane 68.7 n-Butanol 117.7 Hydrochloric Acid 84.8 tert-Butanol .

Best Practices for Cleaning Validation Swab Recovery .

ZenShui/Odilon Dimier/Getty Images Submitted: October 12, 2015 Accepted: December 2, 2015. Parameters affecting cleaning validation swab recovery studies include: the material of construction coupon, residue spike level(s), swab recovering the residue, .

Peptide Synthesis - What do you need to get started?

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