Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Water volume problem

Having received the pre-weighed test item, preparation for its use in the field must be made. Ideally, water to be used in the dilution of the test item should be from mains water or a recognized source. The use of water from standing pools, rivers, etc., could potentially lead to problems with interference from contaminants during analysis of the crop samples. Depending on the formulation under test, the test item can be mixed in a variety of ways. First, the required water volume must be accurately measured. Approximately half of this amount can be poured into a clean bucket or similar mixing container. The temperature of the water should be noted at this point... [Pg.183]

The use of sidestream sand filters or self-cleaning filters may be advantageous in reducing the level of suspended solids to help maintain clean waterside surfaces. If the size of the cooling system and the extent of the problem justifies it, blending with better quality water supplies or treatment of part of the makeup water volume by reverse osmosis (RO) may prove economically viable. [Pg.28]

Aspirin and similar NSAIDs can cause other toxic side effects if used improperly or if taken by patients who have preexisting diseases. For instance, serious hepato-toxicity is rare with normal therapeutic use, but high doses of aspirinlike drugs can produce adverse changes in hepatic function in patients with liver disease.85,99 Likewise, aspirin does not seem to cause renal disease in an individual with normal kidneys,84 but problems such as nephrotic syndrome, acute interstitial nephritis, and even acute renal failure have been observed when aspirin is given to patients with impaired renal function, or people with decreased body water (volume depletion).35,102... [Pg.205]

The total volume of protein crystals is 25—65% water, and problems that are not yet completely resolved are the nature and location of the water molecules. However, much light is being shed on the problem by high-resolution (0.12—0.18 nm 1.2-1.8 A) X-ray diffraction studies, supplemented more recently by neutron diffraction studies (Kossiakoff, 1985). Edsall and McKenzie (1983) have made a tentative classification... [Pg.204]

Windblown sulfates, typically as gypsum, are found in arid regions. Water utilization or agricultural changes can enhance the production of such dusts. The decreasing water volume in the Aral Sea has much enhanced the production of sulfate dusts over recent decades that has become associated with severe environmental problems (O Hara et al, 2000). [Pg.4535]

This phenomenon is explained by the fact that intravenous immunoglobulin increases the non-aqueous phase of the plasma, resulting in a relative loss of plasma water volume. Sodium is virtually restricted to serum water, so each volume of plasma measured will contain less sodium and be interpreted as hyponatremia. Using a direct ion-selective electrode avoids this problem. [Pg.1726]

After the ozone is produced, it must be made to act upon the water. This problem, which is a matter of bringing large volumes of gases and liquids into adequate and continuous contact, has been approached in a variety of ways. Two methods were introduced about 1930. One was developed by Otto, the other by Van der Made. [Pg.448]

Assuming null all vinegar lost (Li), we have 17 unknown variables (i.e., six streams with two components, that is, water and solutes five streams with one component, i.e., water), 12 mass balance equations, and constraints DOF = 22-E-11-5. The mass transfer becomes a solvable problem if we have 11 independent equation (E). zvl and s,- are the mass fraction of water and dry solutes within the streams, respectively Ri+ l f refers to the vinegar volume withdrawn from the barrel z + 1 and used to refill the barrel z Wt are the water volume lost by evaporation m,- are the mass fluxes z is the number of the barrel (with 1 < i < 5 and 1" is the smaller barrel). [Pg.163]

Surface and groundwater become problems at a construction site when interference and delay result in costs which exceed the cost of water removal. Sumps and drainage ditches, if adequate for the water volume involved, are generally constructed by the on-site contractor. When more complex measures are needed, such as wellpoint systems and/or deep wells, the total water removal problem is handled by specialty contractors. [Pg.96]

In summary, the analytical method operates simply, fast and economically, but the simplification of boundary and selection of parameter affect prediction accuracy. It is suitable for predicting water inflow under simple hydrogeological conditions, as well as simple boundary conditions the numerical method is suitable for solving complex problems because of its quick computation, high prediction accuracy, simple computational method and economical, but it is an approximate estimation method and is suitable for the old mine with similar hydrogeological conditions and long-term water volume observation materials. [Pg.110]

High water euts often lead to a bottle-neek in the pro-duetion proeess whereby the rate of oil produetion is constrained by large, undesired volumes of water. The problem is further eompounded for emulsions which require longer residenee times for separation. The stability of the emulsion formed depends on the properties of the oil. Heavy oils and oils whieh are aeidie are more prone to forming stable emulsions. The viseosity of a W/0 emulsion tends to be far higher than that of the oil itself, which, as a consequence,... [Pg.691]

The filter in Problem 14-5 is to be operated at maximum capacity. Dumping and cleaning requires 15 min. Wash water volume in any cycle is 1/10 of filtrate volume collected. Develop an appropriate relation that describes system capacity. [Pg.400]

If the filter in Problem 14-18 is washed at 5.44 atm with wash water volume equal to one-third of the filtrate, what is the required time ... [Pg.402]

Film-forming thus can be economically attractive for use in high-water-volume oil wells, but dosage requirements may become excessive in such wells if the scale problems are severe that is, if very large amounts of scale-forming constituents are present. [Pg.190]

The most common contaminants in produced gas are carbon dioxide (COj) and hydrogen sulphide (HjS). Both can combine with free water to cause corrosion and H2S is extremely toxic even in very small amounts (less than 0.01% volume can be fatal if inhaled). Because of the equipment required, extraction is performed onshore whenever possible, and providing gas is dehydrated, most pipeline corrosion problems can be avoided. However, if third party pipelines are used it may be necessary to perform some extraction on site prior to evacuation to meet pipeline owner specifications. Extraction of CO2 and H2S is normally performed by absorption in contact towers like those used for dehydration, though other solvents are used instead of glycol. [Pg.252]

This procedure has been tested for a lot of bees and conditions are similar. Displl solvent and distill ketone with a water pump. My yield, 41 grams, about 75 %. Scaling. Of course. This procedure have been done with 150 cc of safrol, but with T75 I of methanol with simiair yields, so I ve prefered to present this version wich is better (less solvent, less time) Addition of nitrite i/vas done in 2,5 hours. When scaling, water in B can be decreased if we have problems with our volume flasks, but this means a lot of NaN02 is not dissolved, so each 15 minutes, we close sep. funnel, and shake B a bit, and when there is no foam, we can open sep. funnel again (1 drop or abit more /second). My opinion is 150 is ok, but theorically you can scale more. More time rxn is not a problem for product. [Pg.86]


See other pages where Water volume problem is mentioned: [Pg.356]    [Pg.356]    [Pg.376]    [Pg.87]    [Pg.410]    [Pg.204]    [Pg.210]    [Pg.1286]    [Pg.727]    [Pg.128]    [Pg.143]    [Pg.153]    [Pg.86]    [Pg.209]    [Pg.2530]    [Pg.2866]    [Pg.3775]    [Pg.124]    [Pg.987]    [Pg.79]    [Pg.242]    [Pg.8]    [Pg.549]    [Pg.452]    [Pg.267]    [Pg.271]    [Pg.154]    [Pg.32]    [Pg.483]    [Pg.142]    [Pg.193]    [Pg.1459]    [Pg.44]   
See also in sourсe #XX -- [ Pg.356 ]




SEARCH



Problems Water

© 2024 chempedia.info