Material selection for reactors and heat exchangers in the liquid-phase production of dimethyl ether

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How should the materials for the reactor and heat exchanger in the liquid-phase production of dimethyl ether be selected? The patents made public by Shandong Jiutai use a composite acid of concentrated sulfuric acid and 85% phosphoric acid as a catalyst; methanol is passed over this catalyst to effect dehydration, and water along with dimethyl ether are separated through distillation. The ratio of sulfuric acid to phosphoric acid is 1:0.5–8 on a molar basis, and the temperature ranges from 130 to 180 degrees Celsius. Graphite is used as the material for corrosion prevention and heat exchange; graphite should be resistant to corrosion, but if the resin used for impregnation is not chosen properly, leaks can easily occur. Which company’s graphite heat exchange equipment can withstand such conditions? If 75% sulfuric acid is mixed with 5% nitric acid at 170 degrees Celsius, which type of graphite can withstand it? Shell pressure: 10 kilograms. Its patent number is: CN01107996.7 This post was last edited by qingqingdehaife on 2009-3-16 at 16:50.]