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Line sulfide

Previously, we have developed several techniques for platinum supported zeolite catalysts to improve the benzene product purity, including on-line sulfiding [3], precoking [6], and dual-bed catalyst system [7]. We report herein an in-depth investigation on the synergism of proton zeolite and platinum supported ZSM-12 catalyst (Pt/Z12) in a cascade dual-catalyst system. [Pg.429]

Figure 2-41. Mass gain as a function of time during isothermal (solid lines) and cyclic (broken lines) sulfidation of carbon steel, ICr-0.5MO steel, 12Cr-lMo-0.25V steel, and 18Cr-10Ni-Ti steel at 400 C in Ar-H2-H2S (Schulte et al., 1998). Figure 2-41. Mass gain as a function of time during isothermal (solid lines) and cyclic (broken lines) sulfidation of carbon steel, ICr-0.5MO steel, 12Cr-lMo-0.25V steel, and 18Cr-10Ni-Ti steel at 400 C in Ar-H2-H2S (Schulte et al., 1998).
Fig. 16 Variation of the radius of the first coordination shell / i(M-X) with the eotHdinatirai number A/c for oxides crosses), sulfides (squares), and fluorides (triangles). Lines are polynomial fits as a guide to the eye (black solid line sulfides, broken line oxides, gray solid line fluorides)... Fig. 16 Variation of the radius of the first coordination shell / i(M-X) with the eotHdinatirai number A/c for oxides crosses), sulfides (squares), and fluorides (triangles). Lines are polynomial fits as a guide to the eye (black solid line sulfides, broken line oxides, gray solid line fluorides)...
Fig. 17 Logarithmic variation of dimensionless relative bond valence values s(M-X)/Vid(M) for bonds to oxygen, sulfides, and fluorides at the respective boundary for the first coordination shell Ri with the coordination number. The dotted horizontal line marks the threshold value chosen by Brown the lines are power law fits to the data as a guide to the eye black solid line sulfides,... Fig. 17 Logarithmic variation of dimensionless relative bond valence values s(M-X)/Vid(M) for bonds to oxygen, sulfides, and fluorides at the respective boundary for the first coordination shell Ri with the coordination number. The dotted horizontal line marks the threshold value chosen by Brown the lines are power law fits to the data as a guide to the eye black solid line sulfides,...
Fig. 3. Density of sodium sulfide solutions in water, where the numbers on the vertical lines represent concentrations of Na2S in wt % (1). Fig. 3. Density of sodium sulfide solutions in water, where the numbers on the vertical lines represent concentrations of Na2S in wt % (1).
A conventional circular-wedge roaster consists of a brick-lined steel shell with hearths arched gendy upward from the periphery to a central shaft. The brick hearths may number from 8 to 16 and are ca 1 m apart. The central steel shaft (ca 1.2 m in diameter) revolves at 1 rpm or less carrying two rabble arms per hearth. These rabbles, cooled with air or water, plow the ore from the outside to the center of the hearth where it is dropped to the next hearth for plowing in the opposite direction. The calcine thus proceeds to the bottom where it is dropped into a conveyor. The sulfide sulfur at this point is ca 3.5% (22). [Pg.399]

Some friction materials may contain other potentially harmfiil materials. Lead has been found in some secondary linings. Class B and C organic disk pads, and other friction materials as lead metallic particles, oxides, and sulfides. Several original equipment and aftermarket suppHers are known to have a pohcy against incorporation of lead or other potentially harmfiil materials in thek products. [Pg.275]

Corrosion products and deposits. All sulfate reducers produce metal sulfides as corrosion products. Sulfide usually lines pits or is entrapped in material just above the pit surface. When freshly corroded surfaces are exposed to hydrochloric acid, the rotten-egg odor of hydrogen sulfide is easily detected. Rapid, spontaneous decomposition of metal sulfides occurs after sample removal, as water vapor in the air adsorbs onto metal surfaces and reacts with the metal sulfide. The metal sulfides are slowly converted to hydrogen sulfide gas, eventually removing all traces of sulfide (Fig. 6.11). Therefore, only freshly corroded surfaces contain appreciable sulfide. More sensitive spot tests using sodium azide are often successful at detecting metal sulfides at very low concentrations on surfaces. [Pg.134]

In the sulfide stress cracking region, appropriate metallurgy is required in line piping, pressure vessels, etc. There is a listing of acceptable steels in the NACE standard. Steels with a hardness of less than 22 Rockwell C hardness should be used in areas where sulfide-stress cracking is a problem. [Pg.153]

A man was standing on a ladder, ready to go down into a drain manhole to plug one of the inlet lines. The drain contained some hydrogen sulfide, so he had an air mask ready. But he had not yet put it on because he was well outside the manhole. His feet were at ground level (Figure 11-3). He... [Pg.238]

The System described in the previous section has been extended with a sulfur chemiluminescence detector (SCO) for the detection of Sulfur compounds (32). The separated fractions were thiols + sulfides + thiophenes (as one group), benzothio-phenes, dibenzothiophenes and benzonaphtho-thiophenes. These four groups have been subsequently injected on-line into and separated by the GC unit. Again, no overlap between these groups has been detected, as can be seen from Figure 14.20, in which the total sulfur compounds are shown and from Figure 14.21 in which the separated dibenzothiophenes fraction is presented. The lower limit of detection of this method proved to be 1 ppm (mg kg ) sulfur per compound. [Pg.397]

The first step in the production of synthesis gas is to treat natural gas to remove hydrogen sulfide. The purified gas is then mixed with steam and introduced to the first reactor (primary reformer). The reactor is constructed from vertical stainless steel tubes lined in a refractory furnace. The steam to natural gas ratio varies from 4-5 depending on natural gas composition (natural gas may contain ethane and heavier hydrocarbons) and the pressure used. [Pg.140]

Figure 1.2. Distribution of the stratiform Cu-sulfide and chert-hosted Mn deposits in Japan (Sato and Ka.se, 1996). MTL Median Tectonic Line TTL Tanakura Tcetonic Line ISTL Itoigawa-Shizuoka Tectonic Line BTL Butsuzo Tectonic Line. Figure 1.2. Distribution of the stratiform Cu-sulfide and chert-hosted Mn deposits in Japan (Sato and Ka.se, 1996). MTL Median Tectonic Line TTL Tanakura Tcetonic Line ISTL Itoigawa-Shizuoka Tectonic Line BTL Butsuzo Tectonic Line.
Fig. 2.43. Graphical illustration of sulfur isotope values of HiS (left axis and. solid line) produced during basalt-seawater interaction at various water/rock ratios. Calculations assume that seawater sulfate is mostly removed as anhydrite, that any residual sulfate is reduced by iron oxidation in reacting basalt, and that there is quantitative leaching of basaltic sulfide and homogeneous mixing of both sulfides. Dashed line... Fig. 2.43. Graphical illustration of sulfur isotope values of HiS (left axis and. solid line) produced during basalt-seawater interaction at various water/rock ratios. Calculations assume that seawater sulfate is mostly removed as anhydrite, that any residual sulfate is reduced by iron oxidation in reacting basalt, and that there is quantitative leaching of basaltic sulfide and homogeneous mixing of both sulfides. Dashed line...

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