Method for extracting and recovering hemicelluloses in squeezed waste alkalis
A technology for squeezing waste caustic soda and hemicellulose, which is applied in the field of chemical fiber manufacturing, extraction and recovery of hemicellulose from squeezed waste caustic soda, can solve the problems of low recovery rate of hemicellulose, achieve market application expansion, increase extraction rate, The effect of widening the scope of recycling
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Embodiment 1
[0033] A method for extracting and recovering hemicellulose in pressed waste caustic soda, comprising the following process steps:
[0034] A. Neutralization
[0035] neutralizing the spent caustic soda with acid to a pH value of 8.5 to obtain a neutralized solution of spent caustic soda pressed;
[0036] B. Precipitation
[0037] Add denatured alcohol to the neutralization solution of the spent caustic soda squeezed obtained in step A, leave to settle after stirring, and obtain a precipitated solution of spent caustic soda squeezed;
[0038] C. to filter
[0039] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;
[0040] D. dry
[0041] The filter residue obtained in step C is dried to remove industrial alcohol and water, and the hemicellulose recovered from the waste caustic soda is obtained.
Embodiment 2
[0043] A method for extracting and recovering hemicellulose in pressed waste caustic soda, comprising the following process steps:
[0044] A. Neutralization
[0045] neutralizing the spent caustic soda with an acid to a pH value of 10 to obtain a neutralized solution of the spent caustic soda squeezed;
[0046] B. Precipitation
[0047] Add denatured alcohol to the neutralization solution of the spent caustic soda squeezed obtained in step A, leave to settle after stirring, and obtain a precipitated solution of spent caustic soda squeezed;
[0048] C. to filter
[0049] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;
[0050] D. dry
[0051] The filter residue obtained in step C is dried to remove industrial alcohol and water, and the hemicellulose recovered from the waste caustic soda is obtained.
Embodiment 3
[0053] A method for extracting and recovering hemicellulose in pressed waste caustic soda, comprising the following process steps:
[0054] A. Neutralization
[0055] neutralizing the spent caustic soda with acid to a pH value of 9.25 to obtain a neutralized solution of spent caustic soda pressed;
[0056] B. Precipitation
[0057] Add denatured alcohol to the neutralization solution of the spent caustic soda squeezed obtained in step A, leave to settle after stirring, and obtain a precipitated solution of spent caustic soda squeezed;
[0058] C. to filter
[0059] Filtrating the squeezed spent caustic soda precipitate obtained in step B to obtain a filter residue;
[0060] D. dry
[0061] The filter residue obtained in step C is dried to remove industrial alcohol and water, and the hemicellulose recovered from the waste caustic soda is obtained.
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