Finely divided plantinum (IV) oxide, made by fusing hexachloroplatinic (IV) acid with NaNO3.


Related Terms

PHOSPHORIC ACID POLYMERIZATION

A petroleum-refinery process using phosphoric acid catalyst to convert propylene, butylene, or both, into high-octane gasoline or petrochemical polymers.

OSTWALD PROCESS

An industrial preparation of nitric acid by the oxidation of ammonia; the oxidation takes place in successive stages to nitric oxide, nitrogen dioxide, and nitric acid; a catalyst of platinum gauze is used and high temperatures are needed.

HF AKYLATION

Petroleum refinery alkylation process in which olefins (C3, C4, C5) are reacted with isobutane in the presence of hydrofluoric acid catalyst.

ACID ATTACK

Caused by an incomplete flushing after an acid cleaning process of boilers or similar equipment.

BASE

A material which neutralizes acids. An oil additive containing colloidally dispersed metal carbonate, used to reduce corrosive wear.

BASICITY

The ability of a substance to boost the pH after neutralizing all the acid species.

TOTAL BASE NUMBER (TBN)

The quantity of acid, expressed in terms of the equivalent number of milligrams of potassium hydroxide that is required to neutralize all basic constituents present in 1 gram of sample. (ASTM Designation D 974.) .

HYDROGEN CYCLE

A complete course of cation-exchange operation in which the adsorbent is employed in the hydrogen or free acid form.

PHENOLPHTHALEIN ALKALINITY

A measure of the hydroxide ions plus one half of the normal carbonate ions in aqueous suspension. Measured by the amount of sulphuric acid required to bring the water to a ph value or 8.3, as indicated by a change in colour of phenolphthalein.

ACID CLEANING

The process of cleaning the interior surfaces of steam-generating units by filling the unit with a dilute acid accompanied by an inhibitor to prevent corrosion and by subsequently draining, washing, and neutralizing the acid by a further wash of alkaline water.

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