What is pulp defoaming agent and other defoaming method

Foam control is a primary challenge of pulp and paper processing. If left uncontrolled, foam can create safety and production issues such as slurry overflow, decreased pump efficiency and poor water filtration. Defoamer help minimize these issues by eliminating excess foam from black liquor washing, pulp washing, screening bleaching and other processes.

Defoaming agent

Foam management in modern paper and molded fiber mills is vitally important to prevent various quality, operational, and production problems. Foam can interfere with equipment efficiency, cause losses of pulp bleaching chemicals, and result in environmental liability claims; defoamers provide a solution by stopping foam bubble formation during papermaking processes.

Black liquor used in chemical pulp production tends to form foam during processing, which reduces process efficiency and machine efficiency. Therefore, defoamer and antifoam agents must be utilized in order to reduce foam formation and enhance paper quality production.

The compositions of this invention can easily disperse in additional water by gently agitating a concentrated product with suitable temperatures of water; this provides significant advantages over certain defoaming agent of prior art that require extensive agitation and heat to dissolve in hard water environments. Furthermore, their compositions are extremely stable towards inorganic salts such as calcium carbonate filler materials – an advantage particularly significant since many grades of paper contain significant quantities.

Defoaming emulsion

Foam control in paper and molded fiber machines is essential to avoiding quality, operational and production problems. Foaming can drastically decrease machine efficiency, decrease pulp yields and final paper yields as well as increase bleaching chemical usage. Antifoamers and defoamers must be utilized to eliminate foam generation during production while eliminating air bubbles during process.

Defoaming agent used by pulp mills are oil-in-water emulsions composed of silicone and water. A defoamer typically consists of an aqueous phase containing nonionic surfactants like methyl ester soybean or castor oil or ethylene (bis) stearamide wax; additionally it may include an oil such as oleic or linseed oil which has its acidity stabilized with lecithin or phospholipid.

Defoaming agent are effective tools in treating brown stock and effluent from paper mills. Designed to remain effective against hard water conditions, which often poses challenges to defoaming agents, defoaming agents are available in varying concentrations that can be directly applied to pulp stock as well as being soluble with black liquor.

Defoaming solution

Defoaming solutions for the paper industry provide cost-effective ways of reducing foam formation and breaking existing foam, as well as improving pulp washing efficiency, black liquor management and paper production quality. Furthermore, defoaming agents work well at low temperatures while remaining stable even when exposed to highly concentrated wastewater streams; typically made up of mineral oils, polydimethylsiloxanes or alcohol/stearate formulations.

Previous defoaming agents were not as stable under acid conditions, particularly hard water conditions, than desired. If their emulsions break open they tend to rise to the top of the container and potentially clog pipes leading from it to pumps and then paper machines.

Opting for an effective antifoaming agent is key for effective pulp and paper processing processes, including foam control. A quality anti foaming agent will protect against costly issues like slurry overflow, reduced pump efficiency, poor paper machine deposits, filter drainage issues and water filtration issues – ultimately leading to higher pulp yield and superior product quality.