Chemical pulping is essential to producing high-quality paper because the chemicals used during cooking dissolve the majority of lignin in the wood chips, freeing the cellulose fibers in the wood so that it can be converted to paper. Solenis offers chemistries that improve the efficiency of the cooking process as well as chemistries that ensure the trouble-free operation of digesters.
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After cooked pulp exits the digester, dissolved organic materials and residual cooking chemicals in the brownstock must be separated from the pulp. This separation occurs in the brownstock washers, where water is used to separate the black liquor from the pulp. To help ensure optimal washing performance, Solenis offers a variety of chemistries that improve washing and drainage as well as chemistries that prevent contaminants from negatively affecting washer efficiency.
Learn about our Advantage™ brownstock defoamers and how they can help you be more profitable.
Oxygen delignification is an important process that removes residual lignin left in the pulp after cooking and washing. Providing both environmental and economic benefits, it is a proven way to reduce bleach plant chemical costs and to increase pulp yields in bleached pulping. In addition to offering chemistries that improve lignin removal, Solenis offers chemistries that effectively control foam and scale in oxygen delignification systems.
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Bleaching is a whitening process used in the paper industry to produce pulp with a range of brightnesses. Common problems experienced in the bleach plant, where the whitening process takes place, include foam, scale and pitch deposits. Solenis offers a complete line of treatment chemistries to address these issues and more.
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Just like a paper machine, a pulp dryer has a forming section, press section and dryer section. And, just like leading papermakers, leading market pulp producers rely on Solenis to help keep their operations running smoothly and at top speed. Available technologies for pulp dryers include:
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The primary function of the black liquor evaporators is to increase the concentration of solids in the black liquor that was separated from the pulp in the brownstock washers so that it can be used in the recovery boiler. Solenis offers a variety of technologies that help keep evaporators running efficiently as well as technologies that aid in the separation of soap and tall oil, two valuable by-products of the kraft pulping process.
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The recovery boiler is used to produce steam for heating and electricity and to recover valuable cooking chemicals for use in the digester. It is made up of the fireside, or furnace, where the black liquor is burned and the heat transfer section, where steam is created. Solenis offers a variety of solutions for maintaining the reliability and safety of recovery boilers, including:
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Green liquor contains undissolved particulate material called dregs. In order to be reused in the kraft pulping process, the green liquor must be converted back into white liquor. The first step in this process is to purify the green liquor by removing the dregs in a clarifier. Solenis offers chemistries that improve the efficiency of the recausticizing process by helping to speed the separation of dregs from green liquor as well as chemistries that inhibit the formation of scale in green liquor lines.
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After green liquor is clarified, it is reacted with lime in the slaker to produce a slurry called slaked lime. This slurry is then sent to a series of agitated tanks known as causticizers, where the chemical reaction is completed and the green liquor and lime are ultimately transformed into white liquor and lime mud. To ensure optimal slaking performance, Solenis offers a variety of chemistries that inhibit the formation of scale in slakers as well as cleaning products to address existing scale deposits.
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White liquor and lime mud are formed as a result of the causticizing process. Before white liquor can be used upstream in the digester as a cooking chemical, it must be separated from the lime mud in a clarifier. Solenis offers a line of chemistries that improve the clarification process by speeding the separation of lime mud from white liquor as well as products for cleaning white liquor pressure filters.
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The lime mud filter is used to wash and dewater lime mud before it is sent to the lime kiln. In the lime kiln, heat converts the lime mud back into lime for reuse in the recausticizing process. Solenis offers a number of proven chemistries that improve the washing and dewatering of lime mud as well as chemistries that prevent the formation of scale in lime mud filtering systems.
Contact us today to learn more about our solutions for lime mud filters and lime kilns.