SU447430A1 - Method for separating sulphate soap from black sulphate production liquors - Google Patents

Description

one

The invention relates to methods for producing natural resins and can be used in sulphate-pulp plants in the processing of waste black liquor.

A known method for isolating sulphate soap from black liquors is based on settling sulphate soap when heated.

In order to increase the degree of release of sulphate soap by settling, inorganic salts and organic solvents that are not miscible with lye in an amount of 0.1-5% are added to the liquor, causing coagulation.

This method is characterized by low efficiency (up to 65% of sulphate soap is extracted), as well as the need for solvent regeneration.

To simplify the process and increase the recovery rate of the target product, it has been proposed to use quaternary salts of substituted aliphatic or heterocyclic amines or their corresponding polyamines as coagulating additives.

These additives are used in an amount of 0.02-0.06% of the volume of liquor.

When implementing the proposed method, 75-92% of sulphate soap is isolated, no additional equipment is required for

separating the injected substances which, when decomposed sulphate soap with sulfuric acid, are transferred to the aqueous layer.

Example 1. To 10 liters of weak black liquor containing 10 g / l of sulphate soap 0.2 g / l of decylpyridinium chloride was added. After thorough mixing with a propeller stirrer for 3 to 5 minutes, the liquor is kept at 75-80 ° C for 2 hours. After settling (2 hours), 0.8 g / l of sulphate soap is contained in black liquor (the degree of soap extraction is 92%).

Example 2. To 10 l of weak black liquor containing 10 g / l of sulphate soap, add 0.2 g / l of decylisoquinoline chloride or 0.3 g / l of decyl quinoline chloride, move for 3-5 minutes, incubate at 75-80 ° С black lye for 2 hours. After settling (2 hours) the content of sulphate soap

in the liquor, 1.1 g / l (the recovery rate is 89%).

Example 3. To 10 liters of weak black liquor containing 10 g / l of sulphate soap 0.4 g / l of dimethyloctadecylbenzyl ammonium chloride was added. After stirring and settling for 2 hours at 75-80 ° C, the content of sulphate soap in the liquor is 1.4 g / l (degree of soap extraction is 86%).

Example 4. To 10 liters of weak liquor containing 10 g / l of sulphate soap is added

0.3 g / l of poly-4-vinyl-M-benzyltrimethylammonium chloride, stirred for 3-5 minutes and kept at 75-80 ° C. After settling for 3 hours, 1.8 g / l of sulphate soap is contained in the liquor.

Example 5. To Yul of a weak black liquor containing 10 g / l of sulphate soap, is added 0.2 g / l of poly-4-vinyl-benzyl-nitridinium chloride. After stirring and settling for 3 hours at 75-80 ° C, the content of sulphate soap in the liquor is 2.4 g / l (degree of extraction of soap is 76%).

Example 6 0.4 g / l of poly-4-vinyl-M-benzylisoquinolinium chloride was added to 10 liters of weak black liquor. After stirring and settling for 3 hours at 75-80 ° C, the content of sulphate soap in the liquor is 2.5 g / l (degree of extraction of soap is 75%).

Subject invention

Claims (2)

1. Method of separating sulphate soap from black liquor of sulphate production by standing at elevated temperature in the presence of coagulating additives, characterized in that, in order to simplify the process and increase the recovery of the target product, quaternary salts of substituted aliphatic or heterocyclic amines or corresponding polyamines are used as coagulating additives. 2. A method according to claim 1, characterized in that the quaternary salts of substituted aliphatic or heterocyclic amines or the corresponding polyamips take in an amount of 0.02-0.06% of the volume of liquor.