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What You Need to Know About a Rotary Evaporator

Randy Breece
rotary evaporation

Don’t let the sophisticated name intimidate you. A rotary evaporator is simply a machine that is typically found in chemical laboratories. Among its uses is separating the solvent from samples through evaporation. Another application of the rotary evaporator is molecular baking in preparing extractions and distillations.

Craig around the early 1950s produced the prototype of the device. The Swiss company later on came and commercialized it around 1957. Currenty we have brands like WKIE LAB – The reliable rotary evaporator manufacturer on the market. The rotary evaporator comes in different forms, such as the one litre benchtop unit. Another form is the large scale twenty and fifty-litre version that is used in large scale commercial chemical plants.

How Is It Designed?

The device may appear complicated, but when you break it down it is more understandable. A few of the necessary apparatuses are;
• One motor which spins the evaporation jar that features the user’s sample.
• One vapour vent which acts as the center for rotation
• One vacuum system which reduces the amount of pressure in the system.
• One fluid bath (containing water) to warm up the sample
• One condenser containing a coil
• One flask for collection at the bottom to hold the solvent prior to it re-condensing
• One device to quickly lift the evaporation flask from the heat-bath

Why Use Them?


These types of evaporators are commonly used when trying to separate low boiling point solvents. A good example is ethyl acetate and hexane. Such solvents are generally solid at room temperature. Solutions with high boiling points such as water can also be evaporated if the machine is tweaked to perfection.
The advantages that go about using this are;
• The force of centrifuge in the evaporator force a thin film of water to be spread over a large surface
• It allows for smooth and rapid evaporation of solvents from original samples
Disadvantages;
• It can only work one sample at a time
• When sample types crush into each other, they result in loss of substances intended to be retained

Safety Measures

It is advised only trained chemists and lab technicians to handle the rotary evaporator to avoid accidents. Explosions and burns may occur if handled carelessly. It is therefore keen to ensure you wear gloves, laboratory glasses, and a lab coat. One is also encouraged to have a fire extinguisher that is powder-based nearby in case a fire occurs. Also, seek assistance in case you are faced with any challenge.

I hope that this article proves helpful in giving you the necessary information on rotary evaporation.

Why People Sell or Buy Classic Cars

Randy Breece
woman driver

There are always two sides to the story. So, they say. Why the trade involving old cars is still a brisk business is because there are willing sellers and interested buyers. Owners sell their old cars to Classic Car Buyer for a purpose, and buyers buy them for their own reasons too.

Here are some of the top reasons why owners sell their old cars and why buyers buy them.

From a Seller’s Perspective

  • classic carMalfunctioning Classic Car – Cars is supposed to serve their function, and that is for transporting the owner to his destination. But because they are old, classic cars may not be able to perform this task efficiently, or there are damages disabling them to perform their supposed function. As such an automobile is deemed useless by the owner, so he decides to get rid of his classic car by selling it.
  • Another Income – Although a vintage car plays an important role in the history of a family, new needs arise, and a new source of income is required to augment the increasing budget of a family. By selling their old car, some of the family’s expenses can be covered by the proceeds from the transaction.
  • For More Space – The family’s belongings increase over time, and the garage can be one of the only places where to store some extra baggages. To create more space for them, dispatching your old automobile is one of the viable solutions.
  • To Buy a Serviceable Automobile – When you have been using your family’s old car for your daily routine, you really have to buy another when it gets unserviceable. By selling your damaged car, it can augment your budget for a new car for your family to use.

From a Buyer’s Perspective

  • vintage carClassic Design – To some car enthusiasts, the designs of vintage cars are architectural masterpieces. Ages ago, when cars were manufactured, mass production of cars is not the trend as only a few affluent people can own cars. Cars were individually manufactured strictly following a pencil illustration to come up with a unique design.
  • Nostalgia – When one finds enjoyment in having some things from the past, a classic automobile is a perfect item of value to have. Although classic cars are usually inferior mechanically against the new breed of automobiles, to a nostalgic buyer, riding them brings him back to the beautiful era on his mind.
  • Art Collection – With its unique design, a classic car is a thing of beauty even for ages to come. Your art collection is truly upgraded to a new level when you have one. Art collectors will be surely be awed with the craftsmanship employed to every model of vintage cars.
  • Exclusivity – For a classic car buyer, the rarest models of old cars are the most precious ones. When the vintage car had limited editions when they were manufactured, it is an assurance that you are the owner of a particular classic car with some few others if there are.

The trade of classic cars will last forever until there are sellers and buyers. And as long as vintage cars still exist, they will still continue to awe the world with their timeless beauty.