Re: help regarding modern technology


N:dlzc D:aol T:com (dlzc) wrote:
Dear Bill Penrose:

"Bill Penrose" <penrose@xxxxxxx> wrote in message
news:1156307138.491625.260690@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Bill Penrose wrote:
I've worked with machines that routinely made
30-50% ozone by corona discharge,

That technology has never reached industry. New municipal ozone
generators are running around 12 wt%. Semiconductor ozone
generators are running just upwards of 20 wt%.

I rechecked my reference, which is rather old and out of print:
Horvath M., Bilitzky L., & Huttner J., "Ozone.", Elsevier 1985.
I'm not sure if there is a newer one, since I stopped working on ozone
in 1995.

Sure enough, according to them, ozone may explode above 18 mol% if
ignited by a spark. Spontaneous explosions happen between 38 and 44
mol%, but a metal surface may be needed to initiate the decomp. By
happenstance, our system was all glass and Kynar.

Whaddya know. Looks like we dodged a bullet when working with this
stuff. We had plans to ramp up the output for our client, too, but he
decided 30% (v/v) was enough. (I'm not sufficiently motivated to
convert from mol% to v/v.)

I once got a faceful of the stuff when the power failed and the hood
stopped. I was sick for a week with a sore throat and headache that
wouldn't quit.

Dangerous Bill

.

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