Effect of low pressure on solids

[Danilo Boskovic]

I have a question about low pressure. So if i want to evaporate water from a pulverized product, but keep a solid substance intact (unknow solid, unknown properties, higher boiling point than water, but only slightly), should i do it with low (not too low) pressure? Will it remove more of the substance compared to air drying?

 

[.Scott]

You've created a bit of a problem. Your unknown substance is a solid with a boiling point only slightly higher than water.
Everything I can think of that is solid when water is liquid has a boiling point that is well above the boiling point of water.

Perhaps iodine comes closest to what you are describing. It has a melting point of 113.7C and a boiling point of 180.3C. I would call that more than "slightly higher".

It's really impossible to say without dealing in specifics. If the "solid" has a low latent heat of vaporization and a low vapor pressure at 100C, then you better keep it cold.

We also don't know what affinity the "solid" has for water.

 

[Danilo Boskovic]

By slightly, i ment relatively slightly. The thing is i can not lose more of the substance as i only have a limited source of the plant as its season has passed.

 

[.Scott]

By slightly, i ment relatively slightly. The thing is i can not lose more of the substance as i only have a limited source of the plant as its season has passed.

Is this an organic material?

 

[berkeman]

unknow solid, unknown properties

i only have a limited source of the plant as its season has passed

Well which is it? Is the substance unknown, or do you know what it is because you know what plant you ground up?