Ran into an interesting recommendation on fighting a lithium fire in Joshi, D.K., et al, Organic Process Research & Development, 2005, 9, 997-1002.
In addition to the usual admonitions on the handling of a reactive metal like Li, they warned that water, sand, carbon dioxide, dry chemical, or halon should not be used. Rather, they suggest dry graphite or lithium chloride instead. This seems quite reasonable to me, having reacted both silica and CO2 with magnesium powder in chemical demonstrations in a previous life. If Mg will reduce SiO2 and CO2, then hot/burning lithium ought to be reactive as well.
A similar recommendation is given in Furr, A.K. CRC Handbook of Laboratory Safety, 5th Edition, p. 299, ISBN 0-8493-2523-4.
Lots of semi-batch process development and safety work going on in my lab. We use our reaction calorimeter for a variety of studies now. Naturally we want to know about energy accumulation with a given feed rate or any unforeseen induction or initiation problems in a reaction. We can also home in on recommendations for safe feed rates of reactants into a reaction mass.
What I am beginning to learn from the RC1 work is that running a reaction at low temperature is frequently done for sketchy reasons. Unless there are selectivity or side product issues, you really have to question why the reaction is specified to be run at low temperature. I think some of it comes from habit gained in grad school. Low temperature may introduce dangerous situations with abrupt initiation by accumulation of unreacted reagents. Or it may lead to overly long feed time with the associated costs of added plant time and labor.
There are reagent incompatibilities like nBuLi in THF above – 15 C or so. But you’ll find that MeTHF is a bit more tolerant of temperature than is THF.
The precise temperature management capabilities (Tr) of an RC1 including the ability to lock on a temperature or precision ramping gives insight on solubility questions or on freezing points. The instrument also provides heat capacity data for engineering calculations. it is a very useful apparatus.
The makers of Jeep have resurrected the standard Jeep Cherokee in, well, how else can I say it … a very stupid way. They have abandoned the classic boxy utility vehicle lines of the old Cherokee in favor of the now popular fat and squat ellipsoidal lines of contemporary design. In other words, it looks like a jelly bean or rugby ball. The classic 4.0 Liter Cherokee had power to spare and it had the fantastic visibility of an inverted fish tank. It had troubles too, namely bad electric connectors and perhaps an under-designed cooling system. But at least it had the classic squared-off Jeep lines and lots of traction.
But the greatest sin of all was abandoning the 4.0 L straight-6 engine for the 3.2 L engines. Jeep?? WTF!! What were you thinkin’? I would love to meet the committee of marketing pencil necks and constipated MBA’s responsible for this one. It’s a travesty.
Update: I sit and write at a desk piled with pdf printouts of patents, journal articles, a Phi-Tec 1 handbook, and a great heap of process safety data and reports. I help coworkers find and study patents for their R&D due diligence. The bigger task is running a thermo lab for determining the thermokinetic safety of bulk chemical processing. These two topics, patents and thermodynamics, would induce instant unconsciousness for most folks. An acute boredom-stroke followed by involuntary somnolence and collapse to the floor. Oddly enough, I rather dig these topics- especially the thermodynamics. A single fellow covering these two widely differing topics is entirely a(n) historical artifact, unlikely ever to be repeated.
Several months following throat cancer treatment, my energy and curiosity are back although I still cannot eat solid food due to impaired salivary glands and taste buds. The head-and-neck-onco-doc says it’ll take 1.5 to 2 years for the spitter to come back online. It is like serving a sentence in the Nestle warehouse living on Boost. I enjoy food vicariously watching the Food Network. This is what the term “food porn” means- watching others enjoy a sensory and emotional experience with food.
The year 2014 will see me spending more time with the urology oncologist. At the last appointment he promised to help keep me on the top side of the grass as long as possible. I have to hold him to it.
Here is an idea for debate. Why not pitch our flawed constitution overboard? Replace it with one that supports a parliamentary form of government rather than the fractious, unworkable presidential system we have now. Who else in the world uses this system of government? Why is it that most other forms of government in the world are parliamentary in structure?
Make the US government more responsive to the citizenry by rendering the election cycle time dependent on confidence in the leadership.
The US constitution needs a rewrite. Among the distortions in the constitution-
- The metaphysical equation of money with speech.
- The foggy language of the 2nd amendment that engenders armed fanaticism
- The indistinct barrier between the secular and theocratic civic influences. Keep religion and other magical thinking out of governance. Preserve freedom from religion.
- The near impossibility of getting a bad president or governor out of office.
- Clearer language is needed on what is actually meant by the right to petition congress. Currently this has lead to an intractable cancer of corruption between government and the movers of wealth. (Consider the F-35 strike fighter or the lack of tight control over Wall Street investment banks)
- Apparently the rules for the waging of foreign wars are indistinct because current constitution or presidential structure seems to allow the US much flexibility and low accountability with invasions and sending ordinance across borders.
There are more problems with the constitution. Maybe the reader has thoughts on this? The problems of presidential systems have been studied and this Slate article summarizing the issues is worth reading.
It’s been 16 days since radiation ended. My throat (oropharanx) seems better though the internal blistering has not totally subsided. Fatigue and boredom grind the soul like a rock in my shoe. I’ve collected new books on poetry and science but to no avail. Concentration remains elusive.
Eating is tedious. The g-tube pump is slow and I am not tolerating the nutrient fluid (i.e., “food”) all that well. Food tastes awful and swallowing is problematic.
My other cancer- prostate- is next on the firing line. I won the cancer lottery with an aggressive form that has spread to a lymph node but not to any bones according to the Tc bone scan. I am under hormone ablation therapy which slows down the spread for a few years anyway. We may start radiation in January. The docs won’t say anything about life expectancy. The urologist is disinclined to treat it surgically. At the UC hospital, they have a tumor board meeting every Tuesday where they discuss cases. It’s nice to know that multiple folks are looking at it.