Device and method for extracting and separating lignin from papermaking black liquid

A paper-making black liquor and lignin technology, which is applied in the field of paper-making wastewater treatment, can solve the problems of ineffective use of materials and increase the operating load of the alkali recovery furnace, and achieve the effect of alleviating the load

Active Publication Date: 2015-11-25
武汉凯比思电力设备有限公司
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Problems solved by technology

[0002] A large amount of lignin salt (14~17%-wt) is dissolved in the black liquor produced by alkaline pulping. Lignin is an organic substance with multiple uses. At present, the pulp mill only concentrates the black liquor and sends it to alkali The recovery furnace is burned. On the one hand, the useful substances are not effectively utilized. On the other hand, the operating load of the alkali recovery furnace is increased and the emission of sulfur and nitrogen oxides is increased.

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  • Device and method for extracting and separating lignin from papermaking black liquid

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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] The extraction of lignin in the prior art mainly includes acid analysis method, alkali method, slow coagulation precipitation method and the like. Among them, the inorganic acid analysis method usually uses H 2 SO 4 , HCl or CO in flue gas 2 , SO 2 Adjust the pH of papermaking black liquor (usually adjusted to below 5), so that the sodium lignin phenate in the alkaline solution will remove sodium ions and become insoluble lignin precipitates, and carry out corresponding post-treatment. Alkali analysis method precipitates by adding metal (transition metal) ions that can chelate w...

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Abstract

The invention relates to the technical field of papermaking waste water treatment, particularly relates to a device and method for extracting and separating lignin from papermaking black liquid. According to the device and the method provided by the invention, CO2, SO2 and other acid gases in exhaust gas of an alkali recovery boiler are used for treating the black liquid so as to enable lignin to separate out in a precipitation form; although real help on removal of nitrogen and sulphur generated by a whole slurry making system is not realized, partial nitrogen oxide and sulfur oxide partially stay on a lignin extraction system, so that the exhaust gas treatment load is relieved, the effect of waste control by waste is realized, and meanwhile, a production process is not required to be adjusted greatly since the whole slurry making system does not introduce new impurities.

Description

technical field [0001] The invention relates to the technical field of papermaking wastewater treatment, in particular to a device and method for extracting and separating lignin from papermaking black liquor. Background technique [0002] A large amount of lignin salt (14~17%-wt) is dissolved in the black liquor produced by alkaline pulping. Lignin is an organic substance with multiple uses. At present, the pulp mill only concentrates the black liquor and sends it to alkali The recovery furnace burns out, on the one hand, the useful substances are not effectively utilized, on the other hand, the operating load of the alkali recovery furnace is increased and the emission of sulfur and nitrogen oxides is increased. [0003] In view of this, to overcome the above defects in the prior art and to provide a method for extracting lignin from alkaline pulping black liquor while comprehensively utilizing lignin has become a technical problem to be solved urgently in this field. Co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00
CPCD21C11/0007
Inventor 许俊鸿吕新璐
Owner 武汉凯比思电力设备有限公司
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