Dibutyl phthalate, density

Stmcture is usually measured by a void volume test such as the absorption of dibutyl phthalate (DBPA) (15), or by bulk density measurements of the carbon black under compression. In order to eliminate the effects of pelletizing conditions the DBPA test has been modified to use a sample that has been precompressed at a pressure of 165 MPa (24,000 psi) and then broken up four successive times (24M4) (16). This procedure causes some aggregate breakdown and is claimed to more closely approximate the actual breakdown that occurs duting mbber mixing. 

Liquid densities of acetone, dibutyl phthalate = 764 and 1048 kg/m3 respectively. 

Pan, I.-C., Tang, M., and Chen, Y.-P. Densities and viscosities of binary liquid mixtures of vinyl acetate, diethyl oxalate, and dibutyl phthalate with normal alkanols at 303.15 K, J. Chem. Eng. Data, 45(6) 1012-1015, 2000. 

Calculate the time taken for the liquid level to fall to 5 cm below the top of the tube, neglecting the effects of bulk flow in the vapour. 1 kmol occupies 22.4 m3. Molecular weights of acetone, dibutyl phthalate = 58 and 279 kg/kmol respectively. Liquid densities of acetone, dibutyl phthalate = 764 and 1048 kg/m3 respectively. Vapour pressure of acetone at 315 K = 60.5 kN/m2. Diffusivity of acetone vapour in air at 315 K = 0.123 cm2/s. 

Density values for the samples are dioctyl phthalate, d = 0.981 g/mL dibutyl phthalate, d = 1.043 g/mL and dimethyl phthalate, d = 1.190 g/mL. There should be four standard solutions prepared in this activity. 

The apparatus should be assembled as shown in Fig. 2. If desired, the carboy may be mounted in a thermostat bath if so it must be clamped securely to overcome buoyancy. The manometer is an open tube manometer, one side of which is open to the atmosphere the pressure that it measures is therefore the difference of pressure from atmospheric pressure. A suitable liquid for the manometer is dibutyl phthalate, which has a density of 1.046 g cm at room temperature (20°C). To convert manometer readings (millimeters of dibutyl phthalate) to equivalent readings in millimeters of mercury (Torr), multiply by the ratio of this density to the density of mercury, which is 13.55 g cm at 20°C. To find the total pressure in the carboy, the converted manometer readings should be added to atmospheric pressure as given by a barometer. It is unnecessary to correct all readings to 0°C, as all pressures enter the calculations as ratios. 

For pressures between 0.03 Torr and about 10 Torr, oil manometers are more accurate than mercury manometers, since oil has a much lower density. For example, dibutyl phthalate, which is often used, has a density of 1.046 g cm at 20°C. The absolute pressure is given by... 

Table II Density and dynamic viscosity of dibutyl phthalate at specified temperatures.

Key filler characteristics include density, particle shape, size and size distribution, surface chemistry, oil absorption capacity, hardness, and refractive index. Oil absorption is frequently measured in a few fillers such as carbon black. It is usual to measure the uptake of dibutyl phthalate under standard conditions this gives some information about the surface of the... 

Two milliliters of acetone (mol. wt. of 58) and 2 ml of dibutyl phthalate are combined and placed in a 6-mm-diameter vertical glass tube placed in a 315 K bath. Air at 315°K and atmospheric pressure flows across the top of the tube. The liquid mixture is initially at 1.15 cm below the tube top. What is the amount of time needed for the liquid level to fall to 5 cm below the tube top Vapor pressure and diffusivity of acetone are 60.5 kN/m and 0.123 cm /sec. Acetone and dibutyl phthalate liquid densities are 764 and 1048 kg/m. ... 

The values of an effective network density for SPU, SPUU-TD, SPUU-1, and SPUU-P are 0.56, 1.05, 1.75, 1.30 kmol/m, respectively. Samples were swollen at 25 1°C before the strain and after strain up to the value 350% in the following liquids ethyl acetate, n-octane, p-xylene, toluene, butyl acetate, isoamyl alcohol, DEHP, dibutyl phthalate, DBP, dibutyl sebacate, DBS, di-(2-ethylhexyl) sebacate, DEHS, and tributyl phosphate, TBP. 

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