Naphtha compatibility

The nature of the uses found for naphtha demands compatibility with the many other materials employed in formulation, with waxes, pigments, resins, and so on thus, the solvent properties of a given fraction must be carefully measured and controlled. For most purposes, volatility is important, and because of the wide use of naphtha in industrial and recovery plants, information on some other fundamental characteristics is required for plant design. 

In the Riser Simulator it was possible for the MAB catalyst to reach slurry oil yield levels compatible with the conventional LZM catalyst operating at typical conditions for maximum mid-distillate. However, the yields of heavy naphtha range aromatics were half of those obtained with the LZM catalyst compared at the same slurry oil yield (Figure 2.12). The MAB ClO-Cll aromatics trend as a function of slurry oil yield was a continuation of the inert catalyst trend, an indication that a similar reaction mechanism could be taking place. The minimum slurry oil yield for the inert catalyst, even at maximum severity, was still above 40 wt% ... 

Aromatic content is a key property of low-boiling distillates such as naphtha and gasoline because the aromatic constituents influence a variety of properties including boiling range (ASTM D-86, IP 123), viscosity (ASTM D-88,ASTMD-445,ASTM D-2161,IP71),stability (ASTMD-525, IP 40), and compatibility (ASTM D-1133) with a variety of solutes. 

Most organic salts are also compatible with isophthalic polyesters. Solvents such as amyl alcohols, ethylene glycol, formaldehyde, gasoline, kerosine, and naphtha are also compatible. 

Chem. Descrip. Polyester resin (50%) modified with sag control agent (3.8-4.2%) in solvent naphtha 150/180/xylene Uses Polyester blending resin for solv.-borne base coats and top coats Features Used in combination with compat. resins improves sag control Properties Milky to wh. appearance < 15 m grinding fineness dens. = 1.01 g/cm (20 C) dynamic vise. 350-1200 mPa-s- acid no. < 10 flash... 

Type 430 stainless is resistant to chloride stress corrosion cracking and elevated sulfide attack. Applications are found in nitric acid services, water and food processing, automobile trim, heat exchangers in petroleum and chemical processing industries, reboilers for desulfurized naphtha, heat exchangers in sour-water strippers and hydrogen plant efluent coolers. The compatibility of type 430 stainless steel with selected corrodents is provided in Table 7.4, which is taken from Reference [1]. 

Dow produces a mixture of meta (60) and para (40) isomers of methylstyrene (VT), which it calls vinyltoluene (VT). Blends of VT and medium-oil alkyds, which are produced when VT is heated at 266°F (130°C) in the presence of di-tert-butyl peroxide, are compatible, but the films are hazy. However, graft copolymers are produced when tert-butyl perbenzonate is used as the catalyst at 248°F (120°C) instead of di-tert-butyl peroxide at 266°F (130°C). These graft copolymers are soluble in aliphatic hydrocarbon solvents, such as naphtha. 

SOCCI 3500 is a 10% formulation of solubilized copper 8-quinolinolate. SOCCI 3500 can be used, in solvent applications, for the mildewproofing of textiles and can be diluted with common organic solvents such as mineral spirits, Stoddard solvent or naphtha. Where fast drying is required, VMP naphtha or an aromatic similar to xylol is suggested. Compatible waxes, flame retardants, organosols and other textile treatments can also be used in combination with SOCCI 3500 to achieve the desired finish. 

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