Acid resistance possible advantages

In this instance, brick was also used as a protective layer to shield the structural shell from the effects of heat. The flue itself was designed to stand alone against the forces of gravity and earthquake. An airspace was provided ranging from a few inches to a few feet, so that access could be provided to the exterior surface of the brick liner, a maintenance advantage not possible with the corbel supported brick lining. The structure itself was laid up in either acid resistant silicate or common Portland cement mortars, as previously described. It was basically unreinforced axially, but was corsetted with steel tension bands cir-... 

Chitin and chitosan have high organic solvent resistance, which is advantageous for separation membranes used with organic solvents, where chemical resistance is typical. Specifically, chitin is highly acid resistant and chitosan is highly alkaline resistant. These characteristics make it possible for chitin and chitosan to be used as separation membranes for a variety of uses in response to specific requirements. 

Pure or alloyed lead may be employed as anode in sulfuric acid addition of 1% silver, 0.3% tin, and a little cobalt raises its resistance toward corrosion. Other metals may improve the yield of a given electrode process. Thus, addition of antimony and cadmium to a lead anode [152] is advantageous in the oxidation of o-toluenesulfonamide to o-benzoylsulfonimide (saccharin). The same effect may be obtained, however, by using an uncoated, unalloyed lead anode if Sb203 is added to the anolyte [153]. It seems possible that the dissolution of some antimony from the alloyed lead anode takes place and produces the same effect as the Sb203 in the anolyte. 

Extraction with dithizone in CCI4 or CHCI3 results in the separation of nickel along with traces of a number of other heavy metals [3]. By taking advantage of the differences in resistance of dithizonates to dilute hydrochloric acid, it is possible to separate nickel from Zn and Cd [4]. 

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