FIELD: pulp and paper and wood chemical industries.
SUBSTANCE: invention can be used in preparation of crude sulfate soap for processing. The method for purifying raw sulphate soap includes mixing with a washing solution, settling and separating the soap from the aqueous solution. As a wash solution, an aqueous solution of sodium hydroxide with a concentration of 3-13 wt.% is used at a volume ratio of sulfate soap:wash solution 1:(0.3-0.5).
EFFECT: invention provides a 3.1-9.4 times reduction in the lignin content in the washed soap, while simultaneously reducing the relative amount of the washing solution and reducing problems with further regeneration of the washing solution.
2 cl, 1 tbl, 7 ex
| Title | Year | Author | Number |
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