SU414192A1 - - Google Patents

Description

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The invention relates to a method for distilling filter liquids from soda production and may find application in the chemical industry in the production of soda ash using the ammonia method.

A known method for the distillation of filter liquids from soda production by heating it, decomposing ammonium chloride with lime, distilling off gas (ammonia and carbon dioxide) in the distillation column with steam and using secondary vapor distiller liquid by entering it into the lower part of the distillation heat exchanger.

The disadvantage of this method is the low productivity of the process (600 tons of soda per day).

In order to increase the manufacturing process, the second pair of the proposed method is compressed 1 to pressure) 1 and 2.0-2.5 atm and introduced into the lower part of the distiller.

And p and. M er. Distiller liquid is fed from distillation KOL01PYY to the evaporator, where it is self-absorbed under the conditions of discharge. The secondary vapor formed in the evaporator, directly after the distiller, is compressed to a pressure of 2 atm, mixed with direct steam and fed to

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pnzhnuyu part of the distiller. When davlepin in the evaporator 700 mm Hg. Art. and in the lower part of the distiller 1250 mm Hg. Art. 230 kg of secondary steam is produced with a specific heat content of 638 kcal / kg for each ton of soda produced. The introduction of a comprempted secondary steam into the lower part of the distiller eliminates periodic fluid suspensions in the distillation heat exchanger, stabilizes the technological distillation mode and allows the distillation process to be increased to 615 tons of soda per day.

In addition, the proposed method allows to reduce the steam consumption in the distillation process by pa of 0.15 gcal / t of salt.

Subject invention

The method of distillation of filtering soda production liquid by heating it, decomposing ammonium chlorine with lime, distilling off gas, 11x of gases in a distillation column and using secondary steam, which forms itself as a tentative separator in a distillation column. ; and so that, in order to increase the productivity of the process, the secondary steam is compressed to a pressure of 2.0-2.5 atm and introduced into the 1Н1ЖПЮЮ of the distiller.