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  1. BRT549

    H3PO4 concentration via membrane

    thread136-218042 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...
  2. BRT549

    Chemical standards and expiration dates

    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...
  3. BRT549

    Cleaning ammonia vaporizer

    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...
  4. BRT549

    Non-flooded suction from evaporator

    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...
  5. BRT549

    Split seal - will it take more vibration?

    Got a problem pump that is regularly breaking the seal faces. It's a vaneaxial pump used as a circulator on a vacuum evaporator in phosphoric acid service. 528 rpm, 27,000 gpm, 195F, 21 psi deltaP across the impeller. The current Flowserve seal gets broken about 5 times a year when the pump...
  6. BRT549

    Trying to make NH4F from H2SiF6 - methods?

    Looking for a production method of making ammonium fluoride from a starting material of fluorosilicic acid. Do I need to use ammonia or can I use ammonium hydroxide? I'm trying to avoid PSM materials if possible.
  7. BRT549

    Need better pump for phos acid clarifier underflow

    I have a problem pump that is a constant headache. It's an expeller-design centrifugal pump on the underflow from a phosphoric acid clarifier. The current pump seal will not survive in this service, mainly due to low flow and high inlet pressure: 1.5 sp. gr. phos acid 20 - 30% solids 52 feet...
  8. BRT549

    Salt on Ice - how does it melt?

    I know about the depression of the melting point of a water/salt solution, but how does salt melt ice if they are both a solid. In other words, if I throw salt down on existing ice, there should be no reaction, eh?
  9. BRT549

    Any good FREE cooling tower design downloads?

    Looking for some design programs for checking cooling tower design. Trying to spruce up a mechanical draft cross-flow tower that has seen better days, and I found a little MS-DOS program on ChEresources. Wondering if there is anything else out there?
  10. BRT549

    Anyone ever use a Wilfley table?

    I am interested in older mine and milling technology for gold mining in the American West, and I came across some displays of Wilfey tables in a miniature mill. I have found very little information on their actual design and operation - just enough to get me interested, actually. I would...
  11. BRT549

    What was Bricklin car body made of?

    There was an exotic car made in the '70's that used a bare stainless steel as the body panels. It was called a Bricklin, and was only made for a few years. Does anyone know what type of stainless was used to skin it with?
  12. BRT549

    Calculating blind flange min. thickness

    I'm trying to figure out the minumum thickness of a 36" blind flange. I'm making a crud trap with some big HDPE pipe, and am going to use 2 blind flanges on the ends. I found a formula in Perry's: t = d(3P/16S)^0.5 where d=inside diameter, P=internal pressure, S=allowable stress, and...
  13. BRT549

    How much does a 150# carbon steel blind flange weigh?

    Looking for a weight, but don't have a handy reference. It's a 36" size.
  14. BRT549

    Thermal conductivity of sulfuric acid??

    Looking for thermal conductivity of sulfuric acid for the range 93 -98% H2SO4. Anyone know a good link for this info?
  15. BRT549

    Definition of "weld sensitization" for nickel alloys

    While trying to decide a suitable filler metal, I came across the following statement in a tech bulletin: "Inconel 625 has columbium, which stabilizes the alloy against sensitization during welding." What is weld sensitization? By the way, I'm trying to choose between Inconel 625...
  16. BRT549

    Chill-Shocking heat exchanger tubes

    I'm trying to figure a way to clean heat exchanger tubes in a phosphoric acid evaporator. I've got calcium sulfate (gypsum) anhydrite deposits inside the tubes that defy attempts to chemical clean them away. I remember a way that we used to clean seawater evaporators in the Navy that was...
  17. BRT549

    METHOD OF CHILL-SHOCKING HEAT EXCHANGER TUBES?

    I'm trying to figure a way to clean heat exchanger tubes in a phosphoric acid evaporator. I've got calcium sulfate (gypsum) anhydrite deposits inside the tubes that defy attempts to chemical clean them away. I remember a way that we used to clean seawater evaporators in the Navy that was...
  18. BRT549

    Are there different grades of #2 fuel oil

    I'm looking for info on #2 fuel oil. We use it in floatation cells to beneficiate phosphate ore. I remember a old chemist who used to work in uranium solvent (SX) extraction telling me there were many "grades" of #2 fuel oil. He mentioned a brand or grade called 'napoleum' that he...
  19. BRT549

    Are there different grades of #2 fuel oil?

    I'm looking for info on #2 fuel oil. We use it in floatation cells to beneficiate phosphate ore. I remember a old chemist who used to work in uranium solvent (SX) extraction telling me there were many "grades" of #2 fuel oil. He mentioned a brand or grade called 'napoleum' that he...
  20. BRT549

    ARE THERE DIFFERENT GRADES OF #2 FUEL OIL?

    I'm looking for info on #2 fuel oil. We use it in floatation cells to beneficiate phosphate ore. I remember a old chemist who used to work in uranium solvent (SX) extraction telling me there were many "grades" of #2 fuel oil. He mentioned a brand or grade called 'napoleum' that he...

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