Big Chemical Encyclopedia

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

Articles Figures Tables About

Suction

To lessen the risk of pumping sludges or slurries into a unit, the practice is to leave a safety margin of 50 cm (heel) below the outlet nozzle or install a strainer on the pump suction line. The deposits accumulate with time and the tanks are periodically emptied and cleaned. [Pg.327]

Slurry or slip casting provides a relatively inexpensive way to fabricate unifonn-thickness, thin-wall, or large cross section shapes [4o, 44, 45, 46, 42 aiid 48]. For slip casting, a slurry is first poured into a porous mould. Capillary suction then draws the liquid from the slurry to fonn a higher solids content, close-packed, leather-hard cast on the inner surface of the mould. In a fixed time, a given wall thickness is fonned, after which the excess slurry is drained. [Pg.2766]

When crystallisation is complete, the mixture of crystals and crude mother-liquor is filtered at the pump, again using a Buchner funnel and flask as described on p. 10, and the crystals remaining in the funnel are then pressed well down with a spatula whilst continual suction of the pump is applied, in order to drain the mother-liquor from the crystals as effectively as possible. If it has been found in the preliminary tests that the crystalline material is almost insoluble in the cold solvent, the crystals in the... [Pg.18]

Now fit the weighed funnel G again to the filter-flask, and attach the Pregl filter-tube K as shown (Fig. 21). Apply 2i gentle suction from the water-pump, and dip the open limb of the tube K just below the surface of the liquid in the Carius tube. Draw off the supernatant liquid a little at a time until rather less than 1 ml. remains. Now gently shake the mixture in the Carius tube, and try to adjust the suction so... [Pg.504]

Remove the tube K and the bung L. Examine the underside of the bung for any particles of silver halide that might be adhering wash any such particles down into the funnel G with a small quantity of ethanol. Then wash the inside walls of the funnel, under gentle suction, with 5 ml. of ethanol from a wash-bottle, and finally the walls and precipitate with two 5 ml. portions of acetone, and drain well. [Pg.505]

When the boiling point of the liquid is above 140-150°, an air condenser (Fig. II, I, 1, c) may replace the water condenser. If the liquid is inflammable, the conical flask may be replaced by a Alter or suction flask (see Fig. II, 1, 7, c), and a length of rubber tubing leading to the sink is attached to the side tubulure. [Pg.85]

The technique of the filtration of hot solutions has already been described in Section 11,28. The filtration of cold solutions will now be considered this operation is usually carried out when it is desired to separate a crystalline solid from the mother liquor in which it is suspended. When substantial quantities of a solid are to be handled, a Buchner funnel of convenient size is employed. The ordinary Buchner fimnel (Fig. 11,1, 7, a) consists of a cylindrical porcelain funnel carrying a fixed, flat, perforated porcelain plate. It is fitted by means of a rubber stopper or a good cork into the neck of a thick-walled filtering flask (also termed filter flask, Buchner flask or suction flask) (Fig. 11,1, 7, c), which is connected by means of thick-walled rubber tubing (rubber pressure tubing) to a similar flask or safety bottle, and the latter is attached by rubber pressure tubing to a filter pump the safety bottle or trap is essential since a sudden fall in water pressure may result in the water sucking back. The use of suction renders rapid filtration possihle... [Pg.130]

For solids which melt above 100° and are stable at this temperature, drying may be carried out in a steam oven. The crystals from the Buchner funnel should then be placed on a clock glass or in an open dish. The substance may sometimes be dried in the Buchner funnel itself by utilising the device illustrated in Fig. 77, <33, 1. An ordinary Pyrex funnel is inverted over the Buchner funnel and the neck of the funnel heated by means of a broad flame (alternatively, the funnel may be heated by a closely-fltting electric heating mantle) if gentle suction is applied to the Alter flask, hot (or warm) air will pass over the crystalline solid. [Pg.132]

FILTRATION OF SMALL QUANTITIES OF MATERIAL WITH SUCTION... [Pg.133]

The apparatus depicted in Fig. 11,34, 1, intended for advanced students, may be used for the filtration of a small quantity of crystals suspended in a solvent either a Hirsch funnel or a glass funnel with Witt filter plate is employed. The mixture of crystals and mother liquor is filtered as usual through the funnel with suction. Rotation of the three-way tap wifi allow air to enter the filter cylinder, thus permitting the mother liquor to be drawn oflF by opening the lower tap. The mother liquor can then be applied for rinsing out the residual crystals in the vessel, and the mixture is again filtered into the cylinder. When all the crystals have been transferred to the funnel and thoroughly drained, the mother liquor may be transferred to another vessel the crystals may then be washed as already described (Section 11,32). [Pg.133]

Filtration of corrosive liquids with suction. A strongly alkaline or acid suspension is best filtered through a sintered glass funnel. Alternatively, glass wool or asbestos may be plugged into the stem of a glass funnel or supported upon a Witt plate in a glass funnel. [Pg.135]

By inclining the flask A, applying suction at 3 and connecting 1 to a source of inert gas, the mother liquor may be drawn into the sintered glass funnel C without the... [Pg.135]

A simple apparatus for sublimation in a stream of air or of inert gas is shown in Fig. II, 45, 3.. d is a two-necked flask equipped with a narrow inlet tube B with stopcock and a wide tube C 12-15 inm. in diameter. The latter is fitted to a sintered glass crucible and the usual adapter and suction flask E. A well-fitting filter paper is placed on the sintered glass filter plate to collect any sublimate carried by the gas stream. [Pg.156]

Pure pyridine may be prepared from technical coal-tar pyridine in the following manner. The technical pyridine is first dried over solid sodium hydroxide, distilled through an efficient fractionating column, and the fraction, b.p. 114 116° collected. Four hundred ml. of the redistilled p)rridine are added to a reagent prepared by dissolving 340 g. of anhydrous zinc chloride in a mixture of 210 ml. of concentrated hydrochloric acid and 1 litre of absolute ethyl alcohol. A crystalline precipitate of an addition compound (probable composition 2C5H5N,ZnCl2,HCl ) separates and some heat is evolved. When cold, this is collected by suction filtration and washed with a little absolute ethyl alcohol. The yield is about 680 g. It is recrystaUised from absolute ethyl alcohol to a constant m.p. (151-8°). The base is liberated by the addition of excess of concentrated... [Pg.175]

For alcohols of b.p. below 150°, mix 0- 5 g. of 3-nitrophthalic anhydride (Section VII,19) and 0-5 ml. (0-4 g.) of the dry alcohol in a test-tube fitted with a short condenser, and heat under reflux for 10 minutes after the mixture liquefies. For alcohols boiling above 150°, use the same quantities of reactants, add 5 ml. of dry toluene, heat under reflux until all the anhydride has dissolved and then for 20 minutes more remove the toluene under reduced pressure (suction with water pump). The reaction product usually solidifies upon cooling, particularly upon rubbing with a glass rod and standing. If it does not crystallise, extract it with dilute sodium bicarbonate solution, wash the extract with ether, and acidify. Recrystallise from hot water, or from 30 to 40 per cent, ethanol or from toluene. It may be noted that the m.p. of 3-nitrophthalic acid is 218°. [Pg.265]

In a 1-litre three-necked flask, fitted with a mechanical stirrer, reflux condenser and a thermometer, place 200 g. of iodoform and half of a sodium arsenite solution, prepared from 54-5 g. of A.R. arsenious oxide, 107 g. of A.R. sodium hydroxide and 520 ml. of water. Start the stirrer and heat the flask until the thermometer reads 60-65° maintain the mixture at this temperature during the whole reaction (1). Run in the remainder of the sodium arsenite solution during the course of 15 minutes, and keep the reaction mixture at 60-65° for 1 hour in order to complete the reaction. AUow to cool to about 40-45° (2) and filter with suction from the small amount of solid impurities. Separate the lower layer from the filtrate, dry it with anhydrous calcium chloride, and distil the crude methylene iodide (131 g. this crude product is satisfactory for most purposes) under diminished pressure. Practically all passes over as a light straw-coloured (sometimes brown) liquid at 80°/25 mm. it melts at 6°. Some of the colour may be removed by shaking with silver powder. The small dark residue in the flask solidifies on cooling. [Pg.300]

Suspend 0 25 g. of 2 4-dinitrophenylhydrazine in 5 ml. of methanol and add 0-4 0-5 ml. of concentrated sulphuric acid cautiously. FUter the warm solution and add a solution of 0 1-0-2 g. of the carbonyl compound in a small volume of methanol or of ether. If no sohd separate within 10 minutes, dUute the solution carefuUy with 2N sulphuric acid. CoUect the solid by suction filtration and wash it with a little methanol. RecrystaUise the derivative from alcohol, dUute alcohol, alcohol with ethyl acetate or chloroform or acetone, acetic acid, dioxan, nitromethane, nitrobenzene or xylene. [Pg.344]

Furfuryl acetate. Reflux a mixture of 39 2 g. (34-8 ml.) of redistilled furfuryl alcohol, 48 g. of glacial acetic acid, 150 ml. of benzene and 20 g. of Zeo-Karb 225/H in a 500 ml. bolt-head flask, using the apparatus described under iaoPropyl Lactate. After 3 hours, when the rate of collection of water in the water separator is extremely slow, allow to cool, separate the resin by suction filtration, and wash it with three 15 ml. portions of benzene. Remove the benzene, etc., from the combined filtrate and washings under reduced pressure (water pump) and then collect the crude ester at 74-90°/10 mm. a small sohd residue remains in the flask. Redistil the crude ester from a Claisen flask with fractionating side arm pure furfuryl acetate passes over at 79-80°/17 mm. The yield is 14 -5 g. [Pg.388]

Gyanoacetamide. Place 150 ml. of concentrated aqueous ammonia solution (sp. gr. 0-88) in a 500 ml. wide-mouthed conical flask and add 200 g. (188 ml.) of ethyl cyanoacetate. Shake the cloudy mixture some heat is evolved and it becomes clear in about 3 minutes. Stand the loosely stoppered flask in an ice-salt mixture for 1 hour, filter rapidly with suction, and ash the solid with two 25 ml. portions of ice-cold ethanol. Dry in the air the yield of pale yellow cyanoacetamide is 110 g. (1). Recrystallise from 190 ml. of 95 per cent, ethanol a colourless product, m.p. 119-120 , is deposited with practically no loss. [Pg.434]

A further 25 g. of cyanoacetamide may be obtained by evaporating the original mother liquor to dryness under reduced pressure (water pump) whilst heating the flask on a steam bath. The residue is dissolved in 50 ml. of hot ethanol, the solution shaken for a few minutes with decolourising carbon, Altered with suction whilst hot, and then cooled in ice. The resulting yellowish amide is recrystallised with the addition of decolourising carbon, if necessary. [Pg.434]


See other pages where Suction is mentioned: [Pg.1062]    [Pg.115]    [Pg.10]    [Pg.11]    [Pg.11]    [Pg.166]    [Pg.211]    [Pg.215]    [Pg.260]    [Pg.505]    [Pg.50]    [Pg.51]    [Pg.104]    [Pg.116]    [Pg.127]    [Pg.130]    [Pg.131]    [Pg.132]    [Pg.133]    [Pg.133]    [Pg.135]    [Pg.139]    [Pg.159]    [Pg.161]    [Pg.162]    [Pg.200]    [Pg.232]    [Pg.233]    [Pg.321]    [Pg.388]    [Pg.419]   
See also in sourсe #XX -- [ Pg.141 ]

See also in sourсe #XX -- [ Pg.120 ]

See also in sourсe #XX -- [ Pg.141 ]

See also in sourсe #XX -- [ Pg.3 , Pg.11 , Pg.11 , Pg.11 , Pg.54 , Pg.55 ]

See also in sourсe #XX -- [ Pg.311 ]

See also in sourсe #XX -- [ Pg.125 ]

See also in sourсe #XX -- [ Pg.564 ]

See also in sourсe #XX -- [ Pg.107 , Pg.108 ]

See also in sourсe #XX -- [ Pg.31 , Pg.44 ]

See also in sourсe #XX -- [ Pg.596 ]

See also in sourсe #XX -- [ Pg.1397 , Pg.1398 ]




SEARCH



Acceleration, pump suction

Apparatus for inverted suction filtration

Apparatus suction filtration with “rubber dam

Border suction

Calculation suction specific speed

Capillary suction

Capillary suction test

Capillary suction time

Capillary-pressure suction, lower

Cavitation suction pressure, loss

Centrifugal compressors suction temperature

Centrifugal pump double-suction single-stage

Centrifugal pumps pump suction under

Centrifugal pumps single stage, double suction type

Centrifugal pumps single suction

Centrifugal pumps suction head

Centrifugal pumps suction lift

Centrifugal pumps suction pressure limits

Compressor suction

Compressor suction drum/knockout

Compressor suction scrubber

Compressor suction temperature

Compressors closed suction unloaders

Compressors suction configurations

Constant suction drum pressure

Conveyors, belt suction

Drainage under suction

Entry suction pressure

Estimating Pump Head with Negative Suction Pressure

Example 3-3 Suction Lift

Feed pumps suction side

Filtration suction

Filtration with suction

Filtration with suction miscellaneous apparatus for

Filtration with suction of corrosive liquids

Filtration with suction of small volumes

Flask suction

Floating suction

General suction system

High suction temperature

Impeller double suction

Impeller single suction

Isolation of a solid by suction filtration

Load-bearing behaviour wind suction loads

Minimum suction pressure

NPSH and Pump Suction

Nasogastric suction

Nasogastric suctioning, metabolic alkalosis

Nasogastric suctioning, metabolic alkalosis with

Net Positive Suction Head (NPSH

Net Positive Suction Head (NPSH) Available

Net positive suction

Net positive suction head

Net positive suction head availability

Net positive suction head available

Net positive suction head available NPSHa)

Net positive suction head required

Net positive suction head required NPSHr)

Net positive suction head requirement

Nozzle suction

Packing suction

Permeate stream suction

Plateau border suction

Pressure control suction throttling

Pressure-vacuum suction lysimeters

Pump suction

Pump suction arrangement

Pump suction cleaning

Pump suction decrease

Pump suction physical pressure

Pump suction pressure

Pump suction strainer

Pump suction under vacuum

Pumps centrifugal Double suction

Pumps double suction

Pumps general suction system

Pumps net positive suction head

Pumps single stage, double suction type

Pumps static suction head

Pumps suction head

Pumps suction lift

Pumps suction specific speed

Pumps suction system NPSH

Pumps/pumping double-suction design

Sampling suction sampler used

Soil suction

Spillback suction pressure

Spillback suction pressure control

Static Suction Head

Stress suction surfaces

Sub-atmospheric Suction Pressure

Subatmospheric suction pressure

Suction Couch Roll

Suction Effects

Suction Experiments on Drops

Suction Limitations of a Pump

Suction Press Roll

Suction Single-Stage Pumps

Suction and discharge nozzles

Suction at the Permeate Side

Suction ball

Suction ball filtration

Suction bell

Suction bentonite

Suction blow molding

Suction boxes

Suction bypass

Suction capacity

Suction contamination

Suction controlled wetting tests

Suction couch

Suction cup

Suction detection

Suction diffusion

Suction electrode

Suction energy

Suction equipment

Suction extrusion blow molding

Suction extrusion blow molding process

Suction filter

Suction force, condensation

Suction forces

Suction head

Suction hydraulic

Suction lift

Suction lifter

Suction line filters

Suction line losses

Suction line strainers

Suction load of vacuum system

Suction lysimeter installation and sampling procedures

Suction lysimeters

Suction of fluids

Suction pad

Suction pipe friction

Suction pipette

Suction plate, pump

Suction potential

Suction power

Suction pressure

Suction pressure equation

Suction pressure impact

Suction pressure limit

Suction pressure maintaining constant

Suction pressure throttle valves

Suction pressure, compressors

Suction pull

Suction pyrometer, temperatures

Suction pyrometer, temperatures measured

Suction ratio

Suction recycle valve, discharge

Suction rolls

Suction sampling

Suction sampling device

Suction scrapers

Suction scrubbers

Suction specific speed

Suction specific speed, Nss

Suction speed

Suction system

Suction system NPSH available

Suction system NPSH for studies

Suction system NPSH with dissolved gas

Suction temperature

Suction throttle valve

Suction throttling

Suction throttling, compressor

Suction valve

Suction valves, discharge check

Suction volume

Suction, power and efficiency characteristics

Suction- volume-limited compressor

Suction-lift well-point system

Suction/ liquid heat exchanger

Total Capacity at Ejector Suction

Total Suction Head

Tracheal suction catheter

Transmissivity under suction

Transport by trailing suction hopper dredger or barge

Vacuum suction table

Vacuum-Enhanced Suction-Lift Well Point System

Vertical compressor suction drum

Water suction samplers

Why Does the RO Trip Off on Low Suction Pressure

© 2024 chempedia.info