Method for preparing sodium carboxymethyl cellulose by utilizing degummed seaweed residues

Abstract

The invention discloses a method for preparing sodium carboxymethyl cellulose by utilizing degummed seaweed residues. The method comprises the following steps: firstly adding a certain amount of degummed seaweed residues to a dilute sulfuric acid solution, heating the materials, carrying out hydrolysis and filtration under the condition of boiling and collecting the seaweed residues; obtaining white granular seaweed residues after the steps of bleaching, washing and ethanol washing in sequence; fully mixing the white granular seaweed residues with absolute ethyl alcohol, adding a sodium hydroxide solution to the mixture to obtain mixed liquor I, fully stirring the mixed liquor I and then sending the mixed liquor I into a microwave generator, then pumping the mixed liquor I into an alkalization tank and stirring the mixed liquor I to react; adding chloroacetic acid-ethanol mixed liquor to the alkalized mixed liquor I to obtain mixed liquor II, sending the mixed liquor II into the microwave generator to be treated, then pumping the mixed liquor II into an etherification tank and stirring the mixed liquor II to react; adding glacial acetic acid to regulate the pH value of the mixed liquor II to be neutral after etherification is completed and obtaining a white or faint yellow fibrous crude product after separation with a centrifuge. The method has the advantages that the degree of substitution of the final product can be increased through two-time microwave treatment and microwave treatment is easy to control.

Description

technical field [0001] The invention belongs to the technical field of preparation of sodium carboxymethyl cellulose, and in particular relates to a method for preparing sodium carboxymethyl cellulose by using degummed seaweed residue, in particular, using microwave technology to process the waste seaweed residue from which alginate has been extracted, to prepare The method of taking sodium carboxymethylcellulose (CMC). Background technique [0002] In recent years, the seaweed processing industry is developing vigorously. As the technology of seaweed processing enterprises to extract alginate from seaweed is becoming more and more mature, the output is increasing day by day, and a large amount of degummed seaweed waste is produced. At present, most factories dry the residue after seaweed degumming Afterwards, it is sold as a feed additive or directly discarded, so the degummed seaweed residue with high utilization value cannot be effectively utilized, which has become a dif...

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Problems solved by technology

[0010] Cotton fiber is mainly used as raw material in the production process of the solvent method of CMC at present, but in its preparation process, because the hydroxyl group on the cellulose is difficult to combine with etherifying agent in the reaction of producing CMC from cellulose, and preparation process condition Factors such as the limitation of the final product affect the degree of substitution of the final product, and there are shortcomings such as difficult to control the performance of the product

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