Precipitated Carbon: Filtering Carbon with Retention Discs

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Discussion Overview

The discussion revolves around the challenges of filtering fine carbon precipitate formed from an experiment involving sugar and concentrated sulfuric acid. Participants explore methods to improve the filtration process, focusing on the use of retention discs and alternative filtration techniques.

Discussion Character

  • Experimental/applied, Technical explanation

Main Points Raised

  • One participant, Jim, describes the issue of fine carbon precipitate clogging filter paper during vacuum filtration and seeks advice on how to improve the process.
  • Another participant asks if vacuum filtration is being used, indicating it may be relevant to the filtering issue.
  • Jim confirms the use of vacuum filtration but notes that the filter paper still clogs quickly due to the fine particle size. He suggests allowing the precipitate to settle and decanting as a possible solution.
  • A different participant suggests that a fritted disk may not require filter paper and recommends using a finer fritted disk for better filtration, also mentioning that a fritted filter funnel with an outer jacket could aid in crystallization.

Areas of Agreement / Disagreement

The discussion does not reach a consensus on the best method for filtering the fine carbon precipitate, with multiple suggestions and approaches being presented without agreement on a single solution.

Contextual Notes

Participants express uncertainty about the effectiveness of different filtration methods and the characteristics of the materials being used, such as the size of the fritted disk pores.

jmnew51
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Hey all, :smile:

I'm new to this board. I really think it's great, and I love to visit whenever I have the time. Mainly to read.

But now I have a question.

I recently did an experiment forming carbon from sugar and conc. H2SO4,
but the precipitate is so fine it emmediately clogs the filter paper. Even when I use a Buchner, with 20-25 uM particle retention disc. I was wondering if there is any way to get the precip to clump up a little, so as to not be so fine and clog the paper, and make the filtering process possible?
Thanx
Jim
 
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Are you using vacuum filtration?
 
Yes, I use vacuum(up to 20" Hg.), and still the filter paper slugs up so quick because the particles are so fine.
I guess maybe I could just let the precip. settle and decant.
 
I thought you don't need to use filter paper when you already have a fritted disk. Well then again your disk is coarse and the pores are big. You may want to try a finer fritted disk for your filtration. A fritted filter funnel with an outer jacket may help crystallize the product as well.
 
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