SU870540A1 - Method of cleaning green or white sulphate liquor - Google Patents

Description

(54) OlOCOB CLEANING 3 WLENOGRE OR WHITE

one

The invention relates to methods for the chemical purification of green or white sulphate liquor and can be used mainly in the pulp and paper production of sulphate pulp.

A known method of purification of white sulphate liquor by its magnetic treatment 1 3However, this method does not allow for a high degree of purification of liquor.

Our closest to the invention is a method for purifying green or white sulphate liquor, which involves treating the liquor with a solution of polyacrylamide and then clarifying the liquor by settling 2.

The disadvantages of this method are the high content of suspended particles in the target product, as well as a rather long cleaning process.

The aim of the invention is to reduce the content of suspended particles in the target product and accelerate the process.

The goal is achieved by the fact that in the proposed method of cleaning green

SULFATE DALKA

or white sulphate liquor, predominantly sulphate cellulose production liquor, including treatment of the liquor with polyacrylate solution and subsequent clarification of the liquor by settling, before treatment with a solution of polyacrylamide, the liquor is treated with O, 05-0, 15% poly solution. -1 - 2-dimeti l-5 -ni l l pyridium sulfite in the amount of 2-6 g / m liquor.

The proposed method is carried out as follows.

Sulphite liquor is treated

15 0.05-0.15% solution of poly-1-2-. -dimethyl-5-vinylpyr "daniimethylsuy- | phi (PPS) in the amount of 2-6 g / m of liquor, then stirring is carried out for 5-10 s, after which

20 is treated with a 0.05-0.15% -Hbw solution of polyacrylamide (PAA) in a volume of 10-25 g / microfluor.

the mixture is then sent to settling in a settling tank-clarifier.

Example 1. Sulphate green liquor of sulphate-cellulose production with the content of suspended particles of 5-30 g / l is fed to a tank installed between the soda-recovery NBM BOILER and the clarifier clarifier. Then in a tank with liquor serves PPS solution. After mixing, the liquor is sent to a clarifier clarifier sump, where the PAA solution is set. The obtained jcMecT is again subjected to mixing, after which it is fed into the working zone of the clarifier clarifier.

In the example described, various options for the purification of liquor are used at concentrations of the solutions of the flocculants used (PPS and PPA) in the diuretic range 0.05-0.15%.

The flow rates of flocculants in different variants vary between 2-6 g / m 9 of liquor (for PPS) and 8-24 g / m (for PAM),

In parallel, the prototype green liquor is cleaned for comparison.

The results of the effectiveness of the proposed and known methods are given in table.1.

Table,

The known method (Lye, treated with PolyODO-0, 13 acrylic amide) 5-30 The proposed method (Lyex, treated with PPS + + PAA) 5-30 0.01-0.02

Example 2. Cleaning is subjected to white liquor sulfate cellulose production with suspended particles 8 (J-90 g / l.

In the pipeline through which white liquor is transported from the caustiser to the clarifier clarifier, first known method (Lye treated with polyacrylamide) 80-90 0.12-0.14 The proposed method (Lye, processed PPP and 0.07-0.08 PAA) 80-90

As can be seen from the data presented in table 2, the proposed method in comparison with the known method (prototype) allows to significantly reduce the content of suspended particles in the purified liquor, as well as accelerate

the solution of PPS is set, then the solution of PAA is introduced in 5-10 seconds.

The embodiments of the example, as well as the comparative experience in the prototype method, are analogous to example 1,

The test results are shown in table 2.

table 2

purification process, which leads to an increase in the capacity of the clarifiers-clarifiers.

In addition, the proposed method allows to significantly reduce the total consumption of chemicals. 0.015-0.05 0.01-0.038 20-60 8-30 0.005-0.015 0.02-0.06 20-60 5-15 0.009-0.015 0.011-0.025 20-35 12-26 0.009-0.015 0.25 -0.04 20-35 7-12. 8705 The expected annual economic effect from the use of the proposed method is 100 thousand rubles. formula of the invention. The method of purification of green or white sulphate liquor, mainly sulphate cellulose production liquor, including the treatment of the liquor with polyacrylamide solution and subsequent clarification of the liquor by settling, characterized in that, p. in order to reduce the content of suspended particles in the green product and 06 acceleration of the process, before treatment with a solution of polyacrylamide, lye is treated with 0.05-0.15% solution of 1-2-6 dimethyl-5-Vinyl pyridinium methyl acetate in the amount of 2-6 g / m liquor. . Information sources. taken into account during the examination 1. I. Y. Podchnern et al., Method of accelerating the clarification of white liquor, Paper industry, 9, il973, p. 19. 2. BIEIOKOV V.I. and df Clarification of sulphate liquor polyacrylamidesl, Paper issue, 1963, p. 12-14 (prototype).

Claims (1)

The claims of $ A method for purifying green or white sulfate liquor, mainly cellulose sulfate production liquor, comprising treating the liquor with a polyacrylamide solution and subsequent clarification of the liquor by settling, characterized in that, in order to reduce the suspended particles in the eel product and speed up the process, the liquor is treated with 0, 05-0.15% solution of poly-1-2-dimethyl-5-vinylpyridinium- ₃ methylsulphite in an amount of 2-6 g / msc.