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If you have Adobe Acrobat™ set in your browser as a helper application for .pdf files, you can click here to view an Acrobat .pdf version of this document.Safety and Handling Phosphoric Anhydride (P2O5) Please read and thoroughly understand the Innophos Material Safety Data Sheet (MSDS) for Phosphoric anhydride before attempting to use this product in any manner. Phosphoric anhydride is classified as an OSHA hazardous substance. It is listed on the TSCA inventory and for transportation purposes its proper shipping name is phosphorus pentoxide. It is labeled CORROSIVE.
Safety Phosphoric anhydride is a strong dehydrating agent, and with moisture forms phosphoric acids which are corrosive to the skin, mucous membranes and eyes. In addition, the heat generated upon reaction with moisture may cause thermal burns. Skin moisture alone may be sufficient to generate harmful effects. Avoid breathing P205 dust. Recommended Safety Equipment Includes:
To prevent the inhalation of P205 dust, and to protect the face and eyes, workers should wear a NIOSH/MSHA full face piece cartridge, air purifying respirator, with a particulate prefilter. However, adequate ventilation of the working area is the recommended method of control. In the event of exposure to phosphoric anhydride, GET IMMEDIATE MEDICAL ATTENTION. For emergency action, refer to the MSDS for phosphoric anhydride.
Fire and Explosion P205 is neither combustible, nor supports combustion. It does however react vigorously with moisture producing heat, acid and steam. The heat of hydration may raise the temperature of combustible materials above their autoignition temperature which may cause combustion to occur. Without moisture present, no fire or combustion hazards exist. In case of a fire in areas where P205 exists, carbon dioxide or dry chemicals should be used as fire extinguishers. If water is used to cool closed containers, the amount should be large enough to overwhelm any heat and acid which may be generated. P205 may evolve toxic and highly corrosive fumes when overheated or by contacting oxidizable materials. Firemen should wear protective clothing and use a self-contained breathing apparatus.
Drum Handling Storage: Drums storing phosphoric anhydride must be air and moisture tight at all times. They must be stored in a cool dry well ventilated location away from flammable or combustible materials. Each drum should be readily accessible. The use of a water sprinkler fire protection system in the proximity of the storage area is not recommended. Drums should be inspected frequently for condition. To reduce the risk of moisture absorption the oldest drums should be used first. Drum Use: Because of the rapid absorption of water by P205, exposure of the drum contents to moisture should be prevented. One way of doing this is to plan the use of this product in multiples of whole drums. If a drum must be partially emptied, the drum cover should be quickly and securely replaced. The condition and proper placement of the gasket should be checked. Special attention should be given to the disposal of empty drums. Care must be taken to ensure that all the P205 is removed, since any remaining material will hydrolyze to phosphoric acid and severe corrosion may result. Empty drums should be resealed until ready for cleaning. An empty P205 drum should be treated with all the respect due a full one. With the operator properly protected using the appropriate personal protection equipment, empty drums should be checked that they contain only a trace of residual P205, and then washed thoroughly with copious amounts of water. A subsequent rinsing with a weak sodium carbonate (soda ash) solution followed by another water wash and air blow drying should ensure the safe decontamination of the container. Attention should be paid to the external parts of the container as well as the internal parts. Once the drum is thoroughly cleaned, the DOT label must be removed.
Spills Note that this material is classified as:
Spills are subject to CERCLA reporting requirements:
Spills may be cleaned up using a suitable shovel or scoop or by sweeping. Again the recommended personal protection equipment should be used. Avoid dust generation. Place the recovered material in authorized containers for legal disposal. Subsequently wash the contaminated area with a large volume of water. Do not flush the material into public sewers or waterways. Ensure thorough decontamination of the tools and equipment used in the clean up. Dispose of the recovered material in accordance with the Local, State and Federal regulations. Users of phosphoric anhydride should prepare for handling large spills.
Intermediate Bulk Containers (IBC) Innophos offers phosphoric anhydride in well constructed returnable stainless steel intermediate bulk containers (IBCs). The IBCs hold a net 3,500 pounds of product, and have a fully loaded gross weight of 4,100 pounds. Returnable IBCs offer a convenient and economical method of transporting and handling phosphorus pentoxide. Among the benefits of IBCs compared to drums are the elimination of drum cleaning and disposal requirements, improved safety, automated feed opportunities and reduced contamination potential.
Materials of Construction and the Addition of Phosphoric Anhydride to the Reaction Vessel The addition of phosphoric anhydride to a reactor is commonly achieved with a feed hopper and a rotary valve. Figures 1 and 2 illustrate two possible equipment arrangements which may be custom fabricated by organizations such as Sterling-Fleischman Inc., of Malvern, PA. Because phosphoric anhydride is hygroscopic, the arrangements should be designed to eliminate any contact of it with atmospheric moisture. The drums or IBCs are inverted onto the feed cone or hopper, and the flow of phosphoric anhydride is controlled using the rotary valve. The cones or feed hoppers should be constructed of 316 L stainless steel (SS) with welding to be done with 316 ELC SS rods. PTFE (polytetraflouroethylene) sandwich type gaskets such as Envelon™ or a PTFE envelope (jacketed) gasket such as Chemiseal A-F20™ both manufactured by Garlock Mechanical Packing Division, Palmyra, NY should be used. Valves should be of 316 SS body, ball or plug type, with Teflon™ sleeves, seats and seals. Pumps should be centrifugal and be constructed of 316 SS or Worthite®. Phosphoric anhydride in a feed hopper, cone, IBC or drum, should not contact moisture. In a well sealed system, the vents should be equipped with dryers to dry any air. Alternatively, the system can be continuously purged with about 1/2 cubic foot per minute of dry air or dry inert gas (-25°F dew point). Figures 1 and 2 indicate where purge gas should be introduced. The use of a six inch standard screw conveyor can save space if overhead room is restricted. The screw conveyor should be designed to handle about 1-1/2 times the maximum output of the rotary valve. Both the rotary valve and the screw conveyor can be equipped with variable speed drives to allow for different specific feed rates. If the gravity feed arrangement is used, a vibrator should be placed on the sloping feed pipe. Depending on the degree of agitation in the reactor, and on the rate of P205 addition, a spreading wheel may be necessary to keep the material from forming lumps in the reactor. The wheel should be of 316 ELC SS frame with a 10 or 12 mesh SS screen welded to it. A 1/8 or 1/4 horsepower motor and a standard oil seal mounted on the top pipe flange will provide adequate drive for an unpressurized reactor. The speed of the spreading wheel should be adjusted so that the phosphoric anhydride is evenly distributed over the surface of the reacting liquid without being thrown onto the vessel side walls above the liquid level. Provisions to clean the P205 feeding system by flushing the residual material into the reactor with a liquid used in the reaction should be made. Water is not recommended for this purpose since the hydration of P205 may produce steam, high temperatures and phosphoric acids. All vapors produced in the reaction should be vented away from the P205 feed system.
Figure 1. Phosphoric anhydride feeding system with screw conveyor.
Figure 2. The component parts of a well sealed phosphoric anhydride feeding system with nitrogen purge.
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Container Specifications |
IBC | Drum | Drum | |
|---|---|---|---|---|
| Gross wt. | (lbs.) |
4100 |
435 |
68 |
| Net wt. | (lbs.) |
3500 |
400 |
60 |
| Tare wt. | (lbs.) |
600 |
35 |
8 |
| Capacity | (gals.) |
366 |
55 |
8 |
| Capacity | (cu. ft.) |
49 |
- |
- |
| Height | (in.) |
61 7/8 |
35 1/16 |
13 3/4 |
| Diameter | (in.) |
- |
23 1/2 |
14 3/4 |
| Length | (in.) |
48 |
- |
- |
| Width | (in.) |
42 |
- |
- |
| Gauge of steel |
- |
20 |
24 |
|
| UN or DOT spec. # |
DOT 56 |
1A2/Y295 |
1A2/Y72 |
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TIR-26 NOV. 1996
See your Innophos Sales Representative or call our Order and Customer Satisfaction Team at 1-800-243-5052 for more information about products discussed in this Technical Information Report.
Innophos believes all inform given is this report is accurate. It is offered in good faith, but supplied without consideration or guarantee. Innophos assumes no obligation or liability for the accuracy or sufficiency of the information given or the results obtained, all such information being given or accepted at user's risk. The use(s) referred are listed for purposes of illustration only and the user is urged to investigate and establish the suitability of application of such use(s) in every case. Nothing herein contained is to be construed as a recommendation for uses which infringe valid patents or as extending a license under valid patents or as advising or authorizing practice of any patents or patent applications owned by Innophos or others.
Innophos
P.O Box 8000
Cranbury, NJ 08512-8000, USA
Tel: (609) 495-2495
Fax: (609) 860-9563
