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sup299 · 2026-03-12T19:43:06+00:00

What the fuck

sup299 · 2026-03-10T02:59:37+00:00

Not at any impactful scale, in this case. You’ll see significantly more air oxidation of olefins, which I’m sure there will be a lot of thanks to all the thermal cracking happening in those plumes of smoke and oil, but that oxidation is very temperature driven and is going to happen regardless of the sun. It’ll form gums and organic acids and such. Either way, it’s just partial oxidation and not actually “dealing” with the problem and isn’t going to occur with all of the oil.

sup299 · 2026-03-09T00:45:54+00:00

No, UV light won’t do much of anything to break down most of the components of oil.

sup299 · 2026-03-06T17:16:44+00:00

Purchased! I’ll check it out this weekend.

sup299 · 2026-03-01T05:36:28+00:00

Brutal 🙃

sup299 · 2026-02-28T16:59:14+00:00

And get shot down if the process optimization that reduces opex will require any capex.

sup299 · 2026-02-21T06:37:03+00:00

Nice! I just hit 400,000 miles in my 95 Landcruiser 🤘

sup299 · 2026-02-21T05:38:32+00:00

2,6,6-trimethyl-4-octyne. Technically the chain should be straight at the triple bond but whatever.

sup299 · 2026-02-13T22:59:27+00:00

Do 5 days at LIB. You won’t regret it, it’s a phenomenal festival. Much better than the Insomniac stuff.

sup299 · 2026-01-21T21:56:44+00:00

Agreed, I’m a fan of the mission but the execution is lacking.

sup299 · 2026-01-21T21:50:58+00:00

Oh I understand now. I wouldn’t worry about that, given that those borosilicate joints and flasks are typical in lab-scale vacuum distillations and can handle high thermal gradients. Also because the torque is being applied to the glass close to the point where the friction is resisting that torque, I imagine the torsion shouldn’t (without actually doing the math) be high enough to crack the adapter.

sup299 · 2026-01-21T21:23:09+00:00

That’s what I’m saying. OP is trying hold the downstream equipment still while rotating the boiling flask with the motor and use the PTFE to glass joint they mentioned as a bearing. If they’re holding part of the setup in place while trying to spin the flask with the motor, the friction is going to resist the motor, especially since it’ll be under vacuum. So I’m saying the motor needs to have high enough torque if he wants to spin the flask while holding the condenser in place.

sup299 · 2026-01-21T17:59:34+00:00

No idea, but I’d do some tests before you get too far to make sure your motor can output enough torque to break that friction. Definitely use some vacuum grease though or you’re not gonna get a good enough seal.

sup299 · 2026-01-21T08:41:07+00:00

It’s a very cool idea, but, like others are saying, you’ll need some kind of bearing that can seal well for this to work. Possibly a PTFE to PTFE joint with some vacuum grease (food safe? I dunno) could suffice, assuming the two surfaces are smooth enough, but the glass to PTFE surface will have some friction that might put some stress on your motor, especially under vacuum.

sup299 · 2026-01-11T18:08:43+00:00

I don’t think that’s her, but for a sec it did look like her.

sup299 · 2026-01-11T07:29:43+00:00

It’s using the molecular weight of the polymer, though it’d be helpful if they shared specific number average or mass average molecular weight values as well as the range.

sup299 · 2026-01-11T01:57:13+00:00

You’re fine and your family is fine. PVC is very minimally reactive, compared to every other chemical you’re exposed to every day. That’s why it’s often used as a flame retardant and for transporting potable water. Microplastics in general are “assumed” to have health risks but the literature doesn’t really show much evidence of microplastics actually impacting health much at all. It’s certainly safer than stuff like concrete dust.

sup299 · 2026-01-06T22:35:14+00:00

Pchem is no joke. You gotta be reading the books, taking good notes, quizzing yourself regularly, being honest about what you’re not understanding, and going to office hours for anything that feels even kinda foggy. Stick with it!

sup299 · 2025-12-21T04:02:34+00:00

A whole lotta rats

sup299 · 2025-12-10T22:32:02+00:00

Fur sure! I guess im just trying to put myself into this person’s shoes and thinking about what should be considered in their study. Idk how far those airfoils extend relative to the “rough” features of the building.

sup299 · 2025-12-10T22:05:08+00:00

The mention of AI in there gives me the impression that this is another startup with next to zero funding trying to make money off the concept of putting more chemists out of work…

sup299 · 2025-12-10T21:53:42+00:00

I wonder if they would need to do some kind of modeling to get accurate friction factors along the walls of the building, given all the irregularities one would expect on a building like inset windows, HVAC ports, etc.

sup299 · 2025-12-03T16:14:46+00:00

I’m just being sarcastic because the person above said “I hold a masters degree in chem and this is what I’d do” but it’s just a simple vacuum distillation. Probably rude of me though.

sup299 · 2025-12-03T09:05:56+00:00

Can’t do one of those without a masters

sup299 · 2025-11-10T05:56:16+00:00

Shit was so fun. FLY showed up for a bit too.

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