Effect of low pressure on solids

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Discussion Overview

The discussion revolves around the effects of low pressure on the evaporation of water from a pulverized product while preserving an unknown solid substance with a boiling point slightly higher than that of water. The context includes considerations of the properties of the solid and the implications for drying methods.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions the feasibility of evaporating water from a solid with a boiling point only slightly higher than water, suggesting that most solids have significantly higher boiling points.
  • Another participant proposes that if the solid has low latent heat of vaporization and low vapor pressure at 100°C, it may require cold conditions to avoid loss.
  • A participant expresses concern about the limited availability of the plant material, indicating that any loss of the solid is critical.
  • There is a clarification about the nature of the solid, with a participant questioning whether it is organic and whether its identity is known based on the source plant.

Areas of Agreement / Disagreement

Participants express differing views on the properties of the unknown solid and its implications for evaporation under low pressure. The discussion remains unresolved, with no consensus on the nature of the solid or the best approach for evaporation.

Contextual Notes

The discussion lacks specific details about the solid's properties, such as its latent heat of vaporization and affinity for water, which may influence the effectiveness of low-pressure evaporation.

Danilo Boskovic
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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?
 
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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.
 
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.
 
Danilo Boskovic said:
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?
 
Danilo Boskovic said:
unknow solid, unknown properties
Danilo Boskovic said:
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?
 

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