Hydrogen sulfide evolution

Use solid 5Cr or 12Cr dad for crudes containing over 1 wt% sulfur above 5E0°F (290 C) and for crudes containing o.i to 1 0 wt% sulfur above 650° F (340 C). unless there is operating experience or hydrogen sulfide evolution data to indicate where the break between carbon steel and alloy should be. 

Solid 5Cr or 12Cr clad required for crude containing over 1 wt% sulfur in absence of operating experience or hydrogen sulfide evolution data. For ail hydrogen sulfide, use 9Cr minimum. 

Tokuyama, T, Kuraishi, H., Aida, K., Uemura, T. (1973) Hydrogen sulfide evolution due to a pantothenic acid deficiency in the yeast requiring this vitamin, with special reference to the effect of adenosine triphosphate on yeast cysteine desulfhyrase. Journal of General and Applied Microbiology, 19, 439 66. 

In many applications ultramarine blue is stable to around 400 °C, violet to 280 °C and pink to 220 °C. All have excellent light fastness with a 7-8 rating (full and reduced shades) on the International Blue Wool Scale. Color fade attributed to light exposure or moderate heat is almost always caused by acid attack. Ultramarines react with all acids, and if there is sufficient acid, the pigment is completely decomposed, losing all color, to form silica, sodium and aluminum salts, sulfur, and hydrogen sulfide. Evolution of hydrogen sulfide with acids is a useful test for ultramarine. 

Hydrogen Sulfide Evolution from Colorado Oil Shale... 

Burnham, A. K. Kirkman Bey, N. Koskinas, G. J. "Hydrogen Sulfide Evolution from Colorado Oil Shale," in Proceedings of Symposium on Oil Shale, Tar Sands, and Related Materials, ACS Symposium Series American Chemical Society Washington, DC, 1981. 

Table IX. Hydrogen Sulfide Evolution During Initial Samplings...

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