User manual DE DIETRICH DD 3009 GLASS BROCHURE

[. . . ] This trend is possible only if at the same time the chemical and mechanical resistances of the glass that protects vessels, tanks and parts follow these requirements. This is the reason why De Dietrich® has always invested in research and development of new glass formulas with greater capabilities. The result of our ongoing research enabled us to offer the DD 3009 glass. [. . . ] The use of additives to the reacting substance can inhibit this corrosion permitting the use of glass-lined equipment. When using acids, several tens or several hundreds ppm of silica protect the enamel and considerably reduce the rate of corrosion during the liquid phase. The same result can be obtained at the vapor stage by adding silicon oils. Generally speaking, the higher the temperature, the greater the quantity of silica required, and more the acid is concentrated, the more the amount of silica can be reduced. An attack inhibitor can be useful in one case and yet non-effective in another. Pure Product NaOH 1N 80 °C Buffer pH= 1 ; 100°C + HF 430 ppm HCI 20 % vapor 110 °C 0. 18 mm/year 1. 5 mm/year 0. 036 mm/year 500 ppm CaCO3 0. 09 mm/year 300 ppm SiO2 Silicon Oil 2 ml/l 0. 42 mm/year < 0. 005 mm/year HCI 20 % at 160°C : 0. 5 mm/year With 100 ppm SiO 2 : 0. 05 mm/year 180 H2SO4 30% at 160 °C Micronised silica (Levilite) 160 140 °C Speed of attack (%) 100 80 60 40 20 20 40 60 80 100 ppm of added silica HCI 20 % at 160°C Micronised silica (Levilite) Speed of attack (%) 100 80 60 40 20 % 50 100 150 200 250 ppm of added silica 120 100 0. 2 mm/year 0. 1 mm/year 10 20 30 40 Weight % MECHANICAL PROPERTIES MECHANICAL SHOCk Enamel is a glass with its qualities but also its main weaknesses which are brittleness and low tensile strength. Since the resistance of glass to compression is well above its tensile strength, one of the solutions to improve the mechanical resistance is to put the glazed layer under compressive pre-stress. During mechanical work (deformation, mechanical or thermal shock) the compressive stress must first be offset by an equivalent tensile before the glass could be put under dangerous tensile stress. The different experimental arrangements used for measuring the mechanical shock resistance produce results which cannot be compared to each other. Therefore, there is little use trying to give intrinsic values of the mechanical shock resistance. The only way to compare different glasses is to use the same method and the same criteria. In our method, a 1 kg mass equipped with a 15 mm ball is dropped onto a glass-lined plate (glass thickness: 1. 5 mm). This plate is locked onto a magnetic base, thereby making it thicker and increasing the shock efficiency (no energy absorption through steel vibrations). The plate is electrically grounded, and the electric current going through an electrolyte deposited at the shock location is used as assessment criteria. When tested to this procedure, which is close to the real service conditions, the mechanical shock resistance of the DD 3009 glass is about 80 % greater than that of the former glass. ABRASION The abrasion test (DIN 51152) is far from the actual working conditions of a glass-lined reactor where the effects of the chemical attack enhance those of abrasion. Nevertheless, it allows a comparison between glasses, showing DD 3009 advantageously. Statistically, it has been shown that in practice the cases of destruction by abrasion are negligible. [. . . ] +39 0421 222 128 Fax +39 0421 224 212 info-it@dedietrich. com RUSSIA De Dietrich Rep. Office Moscow Phone +7 495 663 9904 Fax +7 495 663 9905 info@ddps. ru The international business group De Dietrich Process Systems is the leading provider of system solutions and reactors for corrosive applications as well as plants for mechanical solid/liquid separation and drying. The system solutions from De Dietrich Process Systems are used in the industrial areas of pharmaceuticals, chemicals and allied industries. www. dedietrich. com This document has been printed on paper from sustainably managed forests. [. . . ]