SU621818A1

SU621818A1 - Method of obtaining cooking liquor

Info

Publication number: SU621818A1
Application number: SU762424480A
Authority: SU
Inventors: Владимир Викторович Житкову; Людмила Лейзеровна Лейбишская
Original assignee: Научно-Производсвенное Объединение Целлюлозно-Бумажной Промышленности
Priority date: 1976-11-29
Filing date: 1976-11-29
Publication date: 1978-08-30

Description

(54) СПОСОБ ПОЛУЧЕНИЯ ВАРОЧНОГО ЩЕЛОКА(54) METHOD FOR GETTING THE COOKING LIQUID

Изобретение относитс к способу попу-чени варочного щелока и может быть ио пользовано в целлюлозно-бумажной промьии ленности при регенерации химикатов-целлюлозного производства.The invention relates to a process for cooking liquor and can also be used in the pulp and paper industry during the regeneration of chemicals-pulp production.

Известен способ получени варочного щелока путем сжигани отработанного раствора сульфатной или натронной варки целлюлозы , отделени полученного от сжигани минерального огарка и растворени его в воде .A method of producing cooking liquor is known by burning a spent sulphate or soda pulping solution, separating the calcine obtained from burning and dissolving it in water.

Однако дл этого способа характерна недостаточна эффективность процесса.However, this method is characterized by insufficient efficiency of the process.

Целью изобретени вл етс повьщ1еШ1е эффективности процесса получени варочного щелока из отработанных растворов за счет устранени систем каустизации зелоного щелока и обжига известкового щлама , а также уменьшени загр знений окружающей среды.The aim of the invention is to increase the efficiency of the process of obtaining cooking liquor from waste solutions by eliminating caustisation of green liquor and calcining limescale, as well as reducing environmental pollution.

Поставленна цель достигаетс тем, что сжигание раствора провод т при 130О-1650 С с одновременным восстановлением в слое минерального огарка карбоната натри до металлического натри , полученный металлический натрвй под вергают конденсации и соединшот жидкий металлический натрий с Сульфатом натри .дл восстановлени его в сульфид натри и образовавшиес в результате реакции сульфид натри , окись натри и металлический натрий раствор ют в воде.The goal is achieved by burning the solution at 130 ° -1650 ° C while simultaneously reducing sodium carbonate to sodium metal in the mineral cinder layer, the resulting sodium metal is condensed and the sodium metal sulfate combines to reduce it to sodium sulfide and The resulting sodium sulfide, sodium oxide, and metallic sodium are dissolved in water.

Способ осуществл етс следуюидам о&разом .The method is carried out as follows.

Отработанный варочный ра;тв(ф сульфатного или натронного целлюлозных производств сжигают при 13ОО-165О С f образовавшийс при этом карбонат натри восстанавливаетс в слое огарка до газообразного натри при указанной температуре с протеканием следующих реакцийThe spent cooking pot; TV (sulphate or soda cellulose production is burned at 13OO-165O С f the resulting sodium carbonate is reduced in the stubble layer to sodium gas at the indicated temperature with the following reactions

}la,CQ(( (I) Woi2,CO,,H-2C Woi20COIII)} la, CQ (((I) Woi2, CO ,, H-2C Woi20COIII)

Claims

The gaseous sodium obtained in the cinder layer by reactions (1) and II) is condensed, and the liquid sodium is sent to a separate reactor, where the melted or solid sodium sulfate is also introduced before its reduction to the active cooking agent — sulphide. Wcij, S04 8Wa-Noi, Si4Wa., 0 (w) Reaction products (W) are discharged into water, where sodium sulfide dissolves, and sodium oxide gives alkali HjO WaOH (IV) Simultaneously interacts with water and excess sodium remaining after reaction (III) 2Na + 2H2.0 2hlaOH -H (V) The resulting aqueous solution of no sulphide and caustic soda is ready cooking liquor used for the production of pulp by the sulphate method. When regenerating lye from natronyas & pulping pulp dissolves the condensed sodium formed by reactions (1) and (P) by means of water, and as a result of reaction (V) baroque liquor is obtained for pulping sodium sulphate using the new method. The released p4 dissolving by reaction (V) hydrogen, as well as carbon monoxide by reactions (1) and P), can be used as sulfate reducing agents by reacting (Y1)) carbonate by Till reaction or combusted with heat reactions (ix) and (x). .0 N015.60 4-4-00 Na

2.S 4-4CO 2 IVir) 84 1/2 0 (1-X) CO -1/2 0,) The use of the proposed method makes it possible to simplify the system of regeneration of chemicals for sulphate or soda pulp production, to increase the efficiency of the process, to reduce the losses of chemicals and pollution of the environment by eliminating causticization and lime burning, the formula from which it is used and the method for producing cooking liquor by shanging out a sulphate or soda pulping solution, separating the calcine obtained from burning the cinder and dissolving it in water, characterized in that, in order to increase the efficiency of the process, the solution is burned at C while simultaneously reducing sodium carbonate to metallic sodium in a mineral orapj a layer, the resulting metallic sodium is condensed and the liquid metallic sodium is combined with sodium sulfate to restore it is in sodium sulfide, and the sodium sulfide, sodium oxide, and excess metallic sodium formed by the reaction are dissolved in water. Sources of information taken into account during the examination: 1. Nepenin Yu. M. Technologi pulp, vol. II, Goslesbumizdat, 1963, p. 382.