I appreciate your responses, but I think we're thinking of two different things. In the case of a bottle of elemental standard, the expiration date is based on transpiration of water out of the poly bottle or vaporization of a volatile element like Hg or I.
I think the way I'll get around...
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I have done several pilot studies with VSEP filters on phosphoric acid. The goal wasn't increasing concentration, but that was a side effect. The removal of impurities causes an increase in strength of the filtrate.
There is also a commercial process using membranes to make...
One of my duties is running the QC laboratory, and I need some help on determining whether to throw away several thousand dollars of elemental standards due to the expiration date. I did a purge of our analytical standards in 2007, and was throwing away stuff from the 70's and 80's. Now most...
Thanks for the replies. The 'rust' is coming in from the ammonia supply, either during NH3 production or from the CS rail cars. It sticks to the magnetic float follower in the level sensor. As you mentioned, Montemayor, we are getting crummy ammonia, with typical 0.5% water and ~1 ppm iron in...
I am trying to improve the operation of an ammonia vaporizer in fertilizer production service. We switched ammonia providers last year, and am seeing a drop-off in vaporizer performance. The bottom of the bayonet-style vaporizer is full of water after a run, and there are significant rust...
The use of sulfuric acid in ethanol production might take off, since it is used in cellulose breakdown.
The phosphoric acid fertilizer plants in the US are running near capacity, but I don't think there are any plans to increase capacity with any new plants.
There are mountains of sulfur in...
A simple vortex breaker design - build a cross out of metal plate and install inside the inlet pipe. It should be 1.5 times longer than the pipe diameter, so about 72 inches long. Let about 1/3 of it stick out into the tank, but no more than that. Doesn't matter which direction it swirls...
We've got a centrifugal pump that transfers phosphoric acid from one vacuum evaporator to another. The suction line comes off the vapor body and drops about 50 ft to the pump inlet. The suction line has a U-shaped line above and below the liquid level, and a pipe comes off the mid-point of the...
There was an article in a recent "Chemical & Engineering News" about a test whereby about 300 kg of guar gum was added to a pool to increase viscosity. The theory to be tested was that the increased drag would be offset by the increased force the swimmer could exert. Elite swimmers were able...
Many states are looking very closely at industrial byproducts being sold as fertilizer. Problems in Washington state in the late 90's were well-publisized (google "fear in the fields'). California and Washington came out with new regulations that are pretty tight on heavy metals, etc...
