SU1395718A1 - Method of producing concentrate of technological lignosulfonates - Google Patents

Abstract

The invention relates to the pulp and paper industry and improves the quality of the concentrate and improves the efficiency of the process by reducing the viscosity and reducing the foaming of the evaporated solution. Waste monosulfite liquor is added to desulphurized waste sulphite liquor at their weight ratio, respectively.

Description

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The invention relates to methods for producing technical hyglysulfonate (CLW) concentrates and is intended for use in the pulp and paper industry. Obtained by the proposed method concentrates

CLW can be used in various industries, in particular As a binder in the foundry industry, as a plasticizer in the cement and construction industry.

The aim of the invention is to improve the quality of the concentrate and increase the efficiency of the process by reducing the viscosity and reducing the foaming of the evaporated solution.

According to the proposed method, before evaporating the desulphurized spent sulphite liquor (SS), the used monosulphite liquor (MS) is added to it at the following ratio, wt% in terms of absolutely dry substances: Desulphurized SSh 40-95 Used SCH 5-60 MD is a waste in the production of monosulfite hemicellulose. In composition, it is significantly different from sulphite liquor and the product of its biochemical processing - desulphurized sulphite liquor. MS

I contains relatively high molecular weight I ry hemicelluloses in the amount of

15-25% of dry matter, and the content of low molecular weight lignosulfonates in it reaches 50%.

Evaporation is carried out at elevated pressure and under vacuum to a solids content of 47-57%. Spent MS on a sodium or ammonium base can be added either as an un-steamed solution with a dry matter content of 7-11%, or as a concentrate with a dry matter content up to 57%.

Example 1. About 5 l of desulphurized SSh are evaporated in a flask in a flask in a flask in a water bath under reflux under a vacuum to a solids content of 50%. The evaporation process is controlled by condensate overflow. Under the same conditions, the evaporation of solutions consisting of desulphurized SS (sulfite yeast brewing) and MSH on a sodium base is carried out.

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In tab. 1 shows the ratio of components.

In the resulting concentrates, the solids content, dynamic viscosity on an Ostwald skimometer at 70 ° C and foaming capacity after shaking in a cylinder, which is characterized by the initial volume of foam (Y), foam volume in 5 minutes (Y) and foam stability in%, are determined .

Example 2. B of the conditions of example 1 evaporated desulfurized slurry after cooking on an ammonium base. Under the same conditions, evaporation of the solutions consisting of the specified liquor and the MS on an ammonium base is carried out.

In tab. 2 shows the ratio of components.

Ui is added as a concentrate. Analyzes are carried out as in example 5.

Example 3. Under the conditions of example 1, evaporated obsazharenny ssch on a mixed sodium-calcium base, as well as a mixture of the said liquor with MS, in a ratio of 90:10 (on dry matters). For comparison, a mixture of concentrates of these liquors is prepared in the same ratio. The solids content, the conditional viscosity on the VZ-1 viscometer, and the tensile strength (for foundry) and the moisture content of the raw cement slurry are determined at a concentrate consumption of 1.0% dry matter and flowability mm.

Example 4. At a laboratory single-unit evaporation unit at 100–120 ° C and pressure up to 0.12–0.13 MPa, 3 l of desulfuric sulfite liquor was evaporated. Under the same conditions, a mixture of desulphurized SS and U is evaporated at a ratio of 80:20 components.

In tab. 3 shows the ratio of the components. The viscosity obtained on the OZ-1 viscometer is determined from the obtained concentrates. By diluting the concentrates 1, solutions with different solids contents are recovered, in which the viscosity is also determined on a capillary viscometer (Tables 3 and 4).

In tab. 4 shows the viscosity data of samples obtained by known and proposed methods.

As can be seen from the tables, the addition of MSh before evaporation of the desalinated sugar1313

This sulphite liquor reduces viscosity and foaming of the evaporated solution, thereby increasing the capacity of the evaporator. The resulting concentrate is characterized by low viscosity and low foaming ability with suppressive bonding and plasticizing properties.

Claims (1)

Invention Formula The method of obtaining technical lignosulphonate concentrate, including evaporation of desulphurized spent sulphite liquor, o t - Whereas, in order to improve the quality of the concentrate and increase the efficiency of the process by reducing the viscosity and reducing the pricing of the evaporated solution, before evaporation into the desulphurized treated sulphite liquor, the spent monosulphite liquor is removed at their next ratio, wt.% in terms of absolutely dry substances: Desulphurized waste sulphite lye40-95 Spent monosulfite alkali 5-60 Table 3 Note. Sodium monosulfite liquor with a solids content of 50% has a yield of 296-10 Pa-s Note. At a dry matter content of 54.4%, the MS of ammonia base has a viscosity of 8010 Pa-s. table 2 i Method: L, rg, t,  The composition of the sample is concentrated - Dry Condition - Limit of Humidity CLW,% of material to the value of durability neither va,% bone, on the basis of sludge, Obessah-Mono-B3-1, with diluted sulphite, sulphite liquor new liquor Known100-50, 3 7560.90 23.1 The proposed 90-10 .50.1 3700.9A 23.1 Table 4 Way Viscosity on capillary viscose-Viscosity half a meter (20 s), Pa-s-10, with co-on VZ-1 dry matter content,% (50% dry ..- substance c), with 10 20 30 35 I 40 Known 1.6 3.5 9.6 29.4 109.7 360 Pr edla- " 1.6 1.6 3.4 9.4 23.1 72.0 148 Compiled by A. Monosov Editor T. Parfenova Tehred L. Serdyukova Proofreader G. Reshetnik Order 2472/29 Circulation 348 Subscription VIIIPI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4