Baby's first CRC

Hash and Stuff Pre/Post-Processing
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Hey friends,

I’m doing some color remediation in pentane. I’ve read the CRC thread and have a good baseline knowledge. Wondering if anyone had any quick off the shelf equipment solutions that would be relatively budget friendly (I’ve got a welder who owes me a favor or two). I was thinking a cheap 3" SS tube with some weld on spool fittings.

Run size would be about 500g to 1kg of resin. In about 3-5x that volume of pentane.

Also had a few quick questions

  1. I was going to use positive pressure (shouldn’t vacuum pentane? Low BP). Is nitrogen necessary? Or will I be just fine with an off the shelf air compressor?

  2. is there any consensus on if I need to pack the powders or not? (Was going to make a puck of celite at the bottom to start) CRC thread seems to have both options working

  3. how thick of powder stack to use on let’s say a 3" column? I’m not going for significant color fixing. Just a light polish.

  4. Dessicant - I was going to use magnesium chloride (or something similar) to pull trace water. Should I use it before the filter stack? After? Doesn’t matter?

Thanks in advance.

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The move would to have a spring loaded plunger compressing the powders into place…

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Where do I get one of the spring loaded plungers you speak of?

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Try a kilo of powders per kilo of resin

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We both have the same question…

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Lol fair enough. I wonder what else I could use to pack the column (if necessary?) Maybe could vacuum the whole thing down wet to pack it. Then run it pressurized after.

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Since you’re doing pentane I’d definitely say wet pack it, I’m butane so I use a press to pack before running through it

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Definitely wet pack

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Any thoughts on nitrogen vs compressed atmosphere? Can’t see oxidation playing too big of an issue here.

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Have you ever seen how nasty the fluid is when you drain a compressor? I would want something cleaner if it had any chance of contacting material. You can get inline filters to solve that or just use some nitrogen.

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Nitrogen is pretty frickin cheap and you know it doesn’t have the nasty air compressors have

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Good call. I’ll check into both options. I’m sure compressor is a better long term solution. That or get my own nitrogen generator, but I also don’t have $2k either :stuck_out_tongue:

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Praxair has k size tanks for 90 and some change plus 60cents a day rental or I think it was 100 for the year

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Anyone have any ideas on the dessicants? I’d assume before the column makes the most sense?

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Does a vacuumed down wet pack hold up to pressure? Or is channelling likely?

I’m assuming 50-100psi is probably a good range?

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Don’t boil the solvent you use to we pack, just lightly pull through making sure it never runs dry

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I destroyed my $200 8" scintered disk using positive pressure… warped and popped the filter from the ring, BVV sent me a free replacement but I am so wary of posi pressure… NEVER go higher than 20PSI cause any more and youll blow that thing out - til I get a better regulator I’m gonna stick with vac filtering

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I want to say people were mentioning similar results with pressure over 20psi in the crc thread.

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If in pentane backpressure works best. Compressed atmosphere works fine as long as you clean out the incoming air with carbon and a drying agent followed by a ≤2 um screen

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Over the last 3 month I heard over 10x sinister discs cracking or warping.

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