Freeze-drying Jello gelatin with an improved cold trap

I built an improved cold trap from an aluminum pan and a stainless steel bowl. It held more ice than my original copper pipe cold trap, but the 100ml of water from the gelatin still managed to almost plug up the trap.

Category:

Science & Technology

Tags:

• freeze-dry
• freeze
• dry
• jello
• gelatin
• cold-trap
• cold
• trap
• vacuum
• sublimate

[XC2long4u]

Use a window ac evaporator for the condenser.

[bkraz333]

@XC2long4u A single-stage refrigeration loop is probably not cold enough to solidify water vapor at those pressures.

[robot797]

how can i make a coldtrap when i have no acces to dryice or licuid nitrogen?

[bkraz333]

@robot797 The cold trap must be colder than the material being freeze dried so that it will solidify the water being sublimated from the material. If the ice cream is at -30*C, the cold trap should be below eg -60*C. Commercial freeze driers probably use cascaded refrigeration loops to create -60*C (or colder temperatures). Buying dry ice is the easiest and least expensive way to get cryogenic temperatures.

[abigblackdick]

it's aerojello!

[revolutiongames2004]

You should make a liquid fluoride thorium reactor :)

[astrialkil]

Couldn't you use an injector to drain the cold trap?

[astrialkil]

@XC2long4u please post a video of that !

[TerraGamerX]

I see "Jell-O", I hear crunching. I feel weird.

[embraceyourinnerdino]

Yum.

[XC2long4u]

@bkraz333 It would be cold enough with some modification. You can make a pseudo cascade or an auto cascade with a single stage system. I can get a window unit down to -40°C with no modification.

[XC2long4u]

@XC2long4u You have to be careful with the CO2 because it is a fine line between a liquid and a solid at those temps and pressures. You don't want it to solidify in the captube but it should be alright.

[XC2long4u]

@bkraz333 It most certainly is. I didn't say you wouldn't have to modify it. You would need to increase the captube length. Then with the charge you would pull a vacuum and bring back up to 0psi with R744 which is CO2. Then you would charge with either R22, R410, or R290. The suction side should be below -20°C. You wrap the captube around the suction line before it goes into the evaporator. That will be cold enough to condense the R744 into liquid. That will yield a few degrees cooler