High-boiling solvent

Polychlorinated biphenyls (PCBs) have been delected in pigments manufactured in trichlorobenzene, but not in those made with nonchlorinated solvents. High boiling hydrocarbons or esters arc suitable replacements. 

High-boiling range solvent High-boiling glycol... 

High-boiling solvent High-boiling solvent No solvent ultraviolet curing... 

Trimethyl-1,3-pentanediol isobutyrate solvent, high-boiling... 

Butyl diglycol carbonate 2,4-Dichlorotoluene Isobutylbenzene solvent, high-boiling acrylics Methyl isoamyl ketone... 

Films with low porosity were produced when the precursor solution used solvent high boiling temperatures solvents (Fig. 3.3) [10]. This was attributed to a lower rate of evaporation of the solvent during the transport of droplets to the substrate and hence a lower rate of precipitation of the precursor. 

Karathane A trade name for 2,4-dinitro-6-( 1 -methylheptyl)phenyl crotonate, CJ8H24N2O6, a compound which has both acaricidal and fungicidal activity. It is a red-brown oil of high boiling point, insoluble in water but soluble in most organic solvents. Karathane is used for the control of powdery mildew, and is nontoxic to mammals. 

Finally the cup F is connected by a wider tube H to the base of the condenser C. It is essential that when the condenser C is vertical, the tube H slopes gently downwards as shown from the cup F to the condenser C. Since high-boiling solvents are rarely used in this apparatus the condenser C... 

If the solvent constituting the crystallisation medium has a compara tively high boiling point, it is advisable to wash the solid with a solvent of low boiling point in order that the ultimate crystalline product may be easily dried it need hardly be added that the crystals should be insoluble or only very sparingly soluble in the volatile solvent. The new solvent must be completely miscible with the first, and should not be applied until the crystals have been washed at least once with the original solvent. 

By distilling the acid with an inert solvent of high boiling point, such as tetrachloroethane. The water passes over with the solvent and the anhydride remains, for example ... 

Acetylsalicylic acid decomposes when heated and does not possess a true, clearly-defined m.p. Decomposition points ranging from 128° to 135° have been recorded a value of 129-133° is obtained on an electric hot plate (Fig. II, 11, 1). Some decomposition may occur if the compound is recrystaUised from a solvent of high boiling point or if the boiling period during recrystallisation is unduly prolonged. 

Liquids examined by FAB are introduced into the mass spectrometer on the end of a probe inserted through a vacuum lock in such a way that the liquid lies in the target area of the fast atom or ion beam. There is a high vacuum in this region, and there would be little point in attempting to examine a solution of a sample in one of the commoner volatile solvents such as water or dichloromethane because it would evaporate extremely quickly, probably as a burst of vapor when introduced into the vacuum. Therefore it is necessary to use a high-boiling solvent as the matrix material, such as one of those listed in Table 13.1. 

The solvents used for liquid chromatography are the commoner ones such as water, acetonitrile, and methanol. For the reasons just stated, it is not possible to put them straight into the ion source without problems arising. On the other hand, the very viscous solvents that qualify as matrix material are of no use in liquid chromatography. Before the low-boiling-point eluant from the LC column is introduced into the ion source, it must be admixed with a high-boiling-point matrix... 

The solution (or matrix) consists of the substance under investigation dissolved in a high-boiling-point solvent that does not evaporate quickly in the vacuum of a mass spectrometer. 

Physical Properties. Tetrahydrofurfuryl alcohol (2-tetrahydrofuranmethanol) [97-99-4] (20) is a colorless, high-boiling liquid with a mild, pleasant odor. It is completely miscible with water and common organic solvents. Tetrahydrofurfuryl alcohol is an excellent solvent, moderately hydrogen-bonded, essentially nontoxic, biodegradable, and has a low photochemical oxidation potential. Most appHcations make use of its high solvency. The more important physical properties of tetrahydrofurfuryl alcohol are Hsted in Table 1. 

Because tetrahydrofurfuryl alcohol is virtuaHy colorless, it is used in lacquer formulations for aH colors as weU as water-white clear products. More speciftcaHy, tetrahydrofurfuryl alcohol is a wetting dispersant for most pigments. It has a high boiling point, high toluene dilution ratio, and good miscibility with oils, eg, linseed and soya, and is an exceUent solvent for a wide range of resins. 

---