Also called caustic embrittlement cracking, usually occurring in carbon steels or iron- chromium nickel alloys that are exposed to concentrated hydroxide solutions at temperatures of 400 to 480 deg. F.


Related Terms

HOOKER DIAPHRAGM CELL

A device used in industry for the electrolysis of brine (sodium chloride) to make chlorine and caustic soda (sodium hydroxide) or caustic potash (potassium hydroxide); saturated purified brine fed around the anode passes through the diaphragm to the cathode; chlorine is formed at the anode and hydrogen released at the cathode, leaving sodium hydroxide and residual sodium chloride in the cell liquor; the diaphragm prevents the products from mixing.

ALKALI

Any substance having basic (as opposed to acidic) properties. In a restricted sense it is applied to the hydroxides of ammonium, lithium, potassium and sodium. Alkaline materials in lubricating oils neutralize acids to prevent acidic and corrosive wear in internal combustion engines.

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.) .

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.

ALKALINITY

The amount of carbonates, bicarbonates, hydroxides, and silicates or phosphates in the water; reported as grains per gallon, or parts per million as calcium carbonate.

CHLORALKALI

Either of the products of the industrial electrolysis of sodium chloride, that is, sodium hydroxide or chlorine.

CHLORALKALI PROCESS

An industrial chemical process based on the electrolysis of sodium chloride for the production of sodium hydroxide and chlorine.

DIAPHRAGM CELL

An electrolytic cell used to produce sodium hydroxide and chlorine from sodium chloride brine; porous diaphragm separates the anode and cathode compartments.

OXYL PROCESS

Modified FischerTropsch process used to make alcohols, other oxygenated compounds, paraffins, and olefin hydrocarbons from carbon monoxide and hydrogen.

OXO PROCESS

Catalytic process for production of alcohols, aldehydes, and other oxygenated organic compounds by reaction of olefin vapors with carbon monoxide and hydrogen.

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