Method used for preparing sulfonated lignin from sulfate papermaking waste water
A technology for sulfonating lignin and papermaking waste liquid, which is applied in the field of preparing sulfonated lignin from sulfate papermaking waste liquid, can solve the problems of low thermal stability of lignin, long production cycle, and low production efficiency, and shorten the production cycle , Improve production efficiency, high thermal stability
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[0016] Example 1
[0017] A method for preparing sulfonated lignin from sulphate papermaking waste liquid, comprising the following steps: firstly, the papermaking waste liquid is subjected to membrane treatment to obtain a membrane concentrate, and the membrane treatment can adopt a roll membrane or a plate membrane to treat the papermaking waste liquid. The high-molecular alkali lignin is trapped on the membrane surface, accumulated, and concentrated to obtain a membrane concentrate.
[0018] The papermaking waste liquid is pretreated before the membrane treatment to remove water-insoluble particles and fibrous impurities. The pretreatment can be carried out by standing for more than 5 minutes for precipitation, filtering by a filter device or centrifugal separation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.
[0019] The membrane concentrate is acidified by sulfuric acid, hydrochloric acid or carbon dioxide before sulfonation to obt
Example Embodiment
[0022] Example 2
[0023] A method for preparing sulfonated lignin from sulphate papermaking waste liquid, comprising the following steps: firstly, the papermaking waste liquid is subjected to membrane treatment to obtain a membrane concentrate. The membrane treatment can be a roll membrane, a tubular membrane or a plate membrane. In the waste liquid treatment, the high-molecular alkali lignin is trapped on the membrane surface, accumulated, and concentrated to obtain a membrane concentrate.
[0024] The papermaking waste liquid is pretreated before the membrane treatment to remove water-insoluble particles and fibrous impurities. The pretreatment can be carried out by standing and settling for more than 5 minutes, filtering by a filter device or centrifugal separation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.
[0025] The membrane concentrate is subjected to oxidation treatment on the membrane concentrate before sulfonation, so that
Example Embodiment
[0028] Example 3
[0029] A method for preparing sulfonated lignin from sulphate papermaking waste liquid, comprising the following steps: firstly, the papermaking waste liquid membrane is processed to obtain a membrane concentrate, and the membrane treatment can adopt roll membrane, tubular membrane or plate membrane to treat papermaking waste In the liquid treatment, the high-molecular alkali lignin is trapped on the surface of the membrane, accumulated, and concentrated to obtain a membrane concentrate.
[0030] The papermaking waste liquid is pretreated before the membrane treatment to remove water-insoluble particles and fibrous impurities. The pretreatment can be carried out by standing and settling for more than 5 minutes, filtering by a filter device or centrifugal separation by a centrifugal separation device to remove water-insoluble particles and fibrous impurities.
[0031] The membrane concentrate is subjected to oxidation treatment on the membrane concentrate before sulfo
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