Residue solid

NH2CONH2 = NH2CONHCONH2 + NH3 Dissolve the solid residue in a few ml. of warm 10% NaOH solution, cool and add i drop of very dilute copper sulphate solution. A purple coloration is obtained. ... 

The solid residue in the flask dissolves readily in cold water. 

When the volume of liquid in the flask is small, it is advisable to arrange the apparatus for distillation under reduced pressure (water pump) in order to completely separate the allyl cyanide from the solid residue. The final tarry residue may be removed by treatment with concentrated nitric acid, followed by water. 

An additional small quantity of pelargonic acid may bo obtained by treating the solid residue with 60 ml. of concentrated hydrochloric acid. 

To a vigorously stirred suspension of 2 mol of lithium amide in 2 1 of liquid atimonia (see II, Exp. 11) was added in 15 min 1 mol of propargyl alcohol (commercial product, distilled in a partial vacuum before use). Subsequently, 1 mol of butyl bromide was added dropwise in 75 min. After an additional 1.5 h, stirring was stopped and the ammonia was allovied to evaporate. To the solid residue were added 500 ml of ice-water. After the solid mass had dissolved, six extractions with diethyl ether were performed. The (unwashed) combined extracts were dried over magnesium sulfate and then concentrated in a water-pump vacuum. Distillation of the residue through a 40-cm Vigreux column afforded 2-heptyn-l-ol, b.p. 

Thermogravimetry The products of a thermal decomposition can be deduced by monitoring the sample s mass as a function of applied temperature. (Figure 8.9). The loss of a volatile gas on thermal decomposition is indicated by a step in the thermogram. As shown in Example 8.4, the change in mass at each step in a thermogram can be used to identify both the volatilized species and the solid residue. 

Determine the identities of the volatilization products and the solid residue at each step of the thermal decomposition. 

Some elements (S, Se, Te, P, As, Sb, Bi, Ge, Sn, Pb) in liquid samples arc conveniently converted into their volatile hydrides before being passed into the plasma, as discussed in Part A (Chapter 15). For some samples, any volatile solvent is first evaporated in a sample holder, which is then heated strongly to vaporize the resulting solid residue, as discussed in Part C (Chapter 17). 

POC may also include solid residues containing ash and unburned carbon particles. 

Benzyltrimethylammonium chloride [56-93-9J M 185.7, m 238-239 (dec). A 60% aq soln was evapd to dryness under vac on a steam bath, and then left in a vac desiccator containing a suitable dehydrating agent. The solid residue was dissolved in a small amount of boiling absolute EtOH and pptd by adding an equal volume of diethyl ether and cooling. After washing, the ppte was dried under vac [Karusch J Am Chem Soc 73 1246 7957]. 

Acetylcholine chloride [60-31-1] M 181.7, m 148-150 , 151". It is very sol in H2O (> 10%), and is very hygroscopic. If pasty, dry in a vacuum desiccator over H2SO4 undl a solid residue is obtained. Dissolve in abs EtOH, filter and add dry Et20 and the hydrochloride separates. Collect by filtration and store under very dry conditions. [J Am Chem Soc 52 310 1930.] The chloroplatinate crystallises from hot H2O in yellow needles and can be recrystd from 50% EtOH, m 242-244° [Biochem J 23 1069 7929], other m given is 256-257°. The perchlorate crystallises from EtOH as prisms m 116-117°. [J Am Pharm Assocn 36 272 1947.]... 

The hot reaction mixture is poured with stirring over about 0.75 1. of crushed ice in a 2-1. beaker. The beaker is filled with water, and the mixture is stirred to dissolve inorganic salts (Note 5). The insoluble red-brown solid is collected on a suction filter. This crude product, even while damp, is transferred to a 2-1. round-bottomed flask, and 500 ml. of a mixture of 75% (375 ml.) of petroleum ether (b.p. 90-100°) and 25% (125 ml.) of benzene is added. The flask is provided with a reflux condenser, and the mixture is heated at reflux for 15 minutes by means of an electric mantle (Note 6). The resulting solution is decanted into a second 2-1. flask, leaving in the first flask some water and a red-brown solid residue. Po the slightly cooled liquor in the... 

After 2 hours the water separator and the reflux condenser are disconnected, and volatile material is removed from the mixture under reduced pressure and on a steam bath (Note 3). The solid residue is stirred with 200 ml. of cold water and 2 ml. of hydrochloric acid until all the lumps are broken (Note 4). 

FILTER AIDS are fine, chemically inert powders applied in both process and waste rnicrofidtrations to tnaintain high flowrates while giving brilliant clarity. For difficult separations this long-established technology is the economical way to produce high quality fluids and manageable solid residues. Examples of filter aids are ... 

The advantages of thermal incineration are that it is simple in concept, has a wide application, and results in almost complete destruction of pollutants with no liquid or solid residue. Thermal incineration provides an opportunity for heat recovery and has low maintenance requirements and low capital cost. Thermal incineration units for small or moderate exhaust streams are generally compact and light. Such units can be installed on a roof when the plant area is limited. = The main disadvantage is the auxiliary fuel cost, which is partly offset with an efficient heat-recovery system. The formation of nitric oxides during the combustion processes must be reduced by control of excess air temperature, fuel supply, and combustion air distribution at the burner inlet, The formation of thermal NO increases dramatically above 980 Table 13.10)... 

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