Addition gradual

With the introduction of new building technologies, namely application of synthetic polymeric additives, the natural organic additives gradually disappeared [24]. At present, builders are returning to them in particular, biomolecules (saccharides and their derivatives, oils, waxes, etc.) produced by biotechnological procedures have been reintroduced [25]. 

Procedure Place 300 milliliters of 99% nitric acid into a suitable flask, and then place this acid into an ice bath and chill to 0 Celsius. When the temperature reaches 0 Celsius, gradually add 100 grams of N-methylhydroxy acetamide while rapidly stirring the nitric acid and maintain its temperature at 0 Celsius during the addition. After the addition, gradually add 300 grams of 98% sulfuric acid at a rate sufficient to keep the reaction temperature below 5 Celsius. After the addition of the sulfuric acid, remove the ice bath and allow the reaction mixture to warm to room temperature. After which, heat the reaction mixture to 50 Celsius with stirring. Note at 50 Celsius, an active evolution of gas will result. When the temperature reaches 50 Celsius, remove the heat source, and allow the reaction mixture to cool to room temperature. After which, add the entire reaction mixture into 1000 milliliters of ice water. Then, filter-off the precipitated solid, wash with plenty of warm water, and then vacuum dry or air-dry the product. 

Monomer emulsion preparation takes place in stainless steel tanks which are equipped with their own pressure gages, temperature indicators, and rupture disks. Because of the high (>70%) monomer content in a typical emulsion, close attention must be paid to the emulsion to ensure that it does not autoinitiate and produce an uncontrolled exotherm. Once safely formed, monomer emulsions can be added to the main reactor chamber either all at once or via gradual addition. Gradual addition is more commonly employed so that a high degree of temperature control is maintained. 

The values of recovery stress shown in Figures 11 and 12 indicate different trends. CNF and SiC addition gradually decreased recovery stress to values closer to zero. However, CB addition shows some fluctuation and only a small increase. Organoclay incorporation increased the value of recovery stress at higher stretching ratios - an increase of about 30% with a loading of 3 wt% is observed. 

Add 15 g. of finely powdered ammonium carbonate gradually to 50 ml. of glacial acetic acid contained in a 150 ml. round-bottomed flask, shaking the mixture during the addition to ensure a steady evolution of carbon dioxide. When all the carbonate has... 

In an experiment, a slight excess of the hydride is employed to ensure the complete reduction the unused hydride must then be destroyed. This can be done by the cautious addition of (rt) water, or (6) ordinary undried ether, which will ensure that the supply of water is both small and gradual, or (c) an ester such as ethyl acetate, which will be reduced to ethanol. The first of these methods, namely the addition of water, is hazardous and should be avoided. 

The following simple test distinguishes fructose from all other carbohydrates. Upon heating a little fructose with dilute cobalt chloride solution, cooling and treating with a little ammonia solution, a violet to purple colour is developed, - the colour gradually fades and must be observed immediately after the addition of the ammonia solution. Green cobalt hydroxide is formed with all other carbohydrates. 

Cool the reaction mixture to room temperature and add gradually a solution of 75 g. of sodium hydroxide in 125 ml. of water if the mixture boils during the addition of the alkah, cool again. The hydroxide of tin which is flrst precipitated should all dissolve and the solution should be strongly alkahne the anihne separates as an oil. Equip the flask for steam distillation as in Fig. II, 40, 1, and pass steam into the warm... 

Dissolve 3-5 g. of aniline hydrochloride in 20 ml. of absolute ethyl alcohol contained in a 50 ml. conical flask, and add 0-5 ml. of a saturate solution of hydrogen chloride in absolute ethyl alcohol. Cool in ice and add 4 g. (4 -6 ml.) of iso-amyl nitrite (compare Section 111,53) gradually. Allow the mixture to stand for 5-10 minutes at the room temperature, and precipitate the diazonium salt by the gradual addition of ether. Filter ofiF the crystals at the pump on a small Buchner funnel, wash it with 5 ml. of alcohol - ether (1 1), and then with 10 ml. of ether. Keep... 

In a 1 or 1-5 htre round-bottomed flask prepare a solution of 53-5 g. of o-toluidine in 170 ml. of 48 per cent, hydrobromic acid, cool to 5° by immersion in a bath of ice and salt. Diazotise by the gradual addition of a solution of 36 -5 g. of sodium nitrite in 50 ml. of water stopper the flask after each addition and shake until all red fumes are absorbed. Keep the temperature between 5° and 10°. When the diazotisation is complete, add 2 g. of copper powder or copper bronze, attach a reflux condenser to the flask, and heat very cautiously on a water bath. Immediately evolution of gas occurs, cool the flask in crushed ice unless the... 

Dissolve 10 g. of p-nitroaniline (Section IV,51) in a mixture of 21 ml. of concentrated hydrochloric acid and an equal volume of water, and cool rapidly to 0° in order to obtain the hydrochloride of the base in a fine state of division. Diazotise in the usual way (see Section IV,68) by the gradual addition of a solution of 6 0 g. of sodium nitrite in 12 ml. of water. Continue the stirring for a few minutes, filter the solution rapidly, and add it from a separatory funnel to an ice-cold solution of 41 g. of sodium sulphite (90 per cent. NajS03,7H20) in 100 ml. of water containing... 

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