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Preparing a Cooling Bath with Dry Ice and Various Solvents

Description

Dry ice (temperature -78°C) can be mixed with various solvents to produce cooling baths that cover a range of temperatures. Dry ice mixtures are relatively inexpensive.


 

The solvent mixture may consist of

(1) the pure solvent or

(2) a mixtures of solvents.

Pure Solvent

Temperature

cyclohexane

6°C

benzene

5°C

formamide

2°C

cycloheptane

-12°C

ethylene glycol

-12°C (-11°C, -15°C)

benzyl alcohol

-15°C

tetrachlorethylene

-22°C

carbon tetrachloride

-23°C

1,3-dichlorobenezene

-25°C

o-xylene

-29°C

m-toluidine

-32°C

3-heptanone

-38°C

acetonenitrile

-42°C

pyridine

-42°C

cyclohexanone

-46°C

m-xylene

-47°C

diethyl carbitol

-52°C

n-octane

-56°C

isopropyl ether

-60°C

chloroform

-61°C

carbitol acetate

-67°C

ethanol

-72°C (-78°C)

acetone

-78°C

sulfur dioxide

-82°C

propyl amine

-83°C

diethyl ether

-100°C

 

Some common mixtures used with dry ice:

(1) o-xyelene and m-xylne (see previous section): cover a range of -26 to -70°C

(2) ethanol and ethylene glycol: cover a range of -12 to -78°C

 


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