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In a pulping process, a vessel that receives the solution of chips and chemicals before the solution is washed; where the steam from the digester is removed to atmosphere. The chips and chemical are blown into the vessel causing the break-up of the chips.



Related Terms

DIGESTER

A vessel used to cook the wood and chemicals to break down the lignin that binds the cellulose fibres together.

SULPHITE PROCESS

A chemical pulping process that uses an acidic calcium sulphite solution plus heat to break the bonds in wood between the cellulose and the wood fibres.

CONDUCTIVITY CELL

A glass vessel with two electrodes at a definite distance apart and filled with a solution whose conductivity is to be measured.

BOILER

A closed vessel in which water is heated, steam is generated, steam is superheated, or any combination thereof, under pressure or vacuum by the application of heat from combustible fuels, electricity, or nuclear energy. The term dose not include such facilities of an integral part of a continuous processing unit but does include fired units of heating or vaporizing liquids other than water where these units are separate from processing systems and are complete within themselves.

EVAPORATOR

A pressure vessel used to evaporate raw water by means of a steam coil. The steam is condensed by means of cooling water coils, and this distilled water is used as make-up for boiler feed.

BOILER WATER

A term construed to mean a representative sample of the circulating boiler water, after generated steam has been separated and before the incoming feedwater or added chemical becomes mixed with it so that its composition is affected. (ASTM - D860)

INCINERATION AREA

An officially designated offshore area for the burning of chemical waste by specially equipped vessels. The depiction of incineration areas on charts (in conjunction with radio warnings) is necessary to insure that passing vessels do not mistake the burning of waste for a vessel on fire.

ACID PROCESS

A chemical pulping process that uses an acidic calcium sulphite solution plus heat to break the bonds in wood between the cellulose and the wood fibres.

ELECTROLYSIS

Chemical decomposition caused by action of an electric current in a solution.

CRYSTALLIZER

Process vessel within which dissolved solids in a supersaturated solution are forced out of solution by cooling or evaporation, and then recovered as solid crystals.

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