A system and process for preparing acid-analysis lignin and sodium lignosulfonate from pulping black liquor
A technology of sodium lignosulfonate and acid analysis of lignin, which is applied in the field of light industry pulping and papermaking, can solve the problems of lignin waste and carbon emission intensifying greenhouse benefits, and achieve cost saving, greenhouse gas emission reduction and minimum consumption the effect of
Active Publication Date: 2021-11-30
CHINA LIGHT IND INT ENG CO LTD
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Problems solved by technology
In the existing technology, the practice of directly concentrating the black liquor and then burning it to recover the alkali not only causes a large amount of carbon emissions and increases the greenhouse effect, but also leads to the waste of lignin
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[0025] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0026] Such as Figure 1-3 As shown, the present invention provides a system for preparing acid analysis lignin and sodium lignosulfonate from pulping black liquor, including a preliminary treatment system 1 , a sulfonation treatment system 2 and an acid analysis treatment system 3 .
[0027] The preliminary treatment system 1 comprises a first dilute black liquor tank 11, a heat exchanger 12, a dilute black liquor storage tank 13, a stack filter 14, a filtrate circulation tank 15, a nanofiltration membrane separation device 16, a membrane separation tank 17, Semi-concentrated tank 18. The outlet of the first dilute black liquor tank 11 is connected to the inlet of the heat exchanger 12 , and the outlet of the heat exchanger 12 is connected to the inlets of several dilute black liquor storage tanks 13 . The outlet of this dilute black liquor s...
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A system and process for preparing acid analysis lignin and sodium lignosulfonate from pulping black liquor, the system includes a preliminary treatment system, a sulfonation treatment system and an acid analysis treatment system; the preliminary treatment system includes the first dilute black liquor tank , heat exchanger, dilute black liquor storage tank, stack filter, filtrate circulation tank, nanofiltration membrane separation device, membrane separation tank, semi-concentrated tank; the sulfonation treatment system includes a dispensing tank, storage tank, multi-effect evaporation device, concentrated solution tank, sulfonation reaction kettle, collection tank, spray drying tower, cyclone separator and dust collector; the acid analysis treatment system includes acid analysis liquid storage tank, acid analysis reactor, primary lignin filter press, beating Tank, lignin slurry feed pump, secondary lignin filter press; process includes pulping black liquor preliminary treatment section, sulfonation treatment section, acid analysis treatment section.
Description
technical field [0001] The invention belongs to the technical field of light industry pulping and papermaking, in particular to a system and process for preparing acid-analyzed lignin and sodium lignosulfonate from pulping black liquor. Background technique [0002] In the traditional chemical pulping production line, the black liquor produced in the cooking section contains organic matter and inorganic matter, the organic matter is mainly lignin, and the inorganic matter is mainly alkaline chemicals for cooking. The mainstream treatment method is to send the black liquor to the alkali recovery workshop to concentrate and then burn and recover chemicals, and the organic matter (lignin) will be converted into carbon dioxide after burning. However, lignin is an excellent resource, and lignin and its derivatives are widely used in synthetic resins and adhesives, rubber reinforcing agents, oilfield chemicals, building materials additives and other fields. In the prior art, the ...
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IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 刘宇朱全茂
Owner CHINA LIGHT IND INT ENG CO LTD