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Method for preparing potassium carbonate by membrane method

A technology of potassium carbonate and potassium bicarbonate, applied in carbonate preparations, alkali metal carbonates, chemical instruments and methods, etc., can solve the problems of low price, difficult recycling, and high energy consumption, and achieve an easy reaction process. , the price of raw materials is cheap, the effect of high product purity

Active Publication Date: 2017-09-01
BEIJING NEWBIOLINK TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The main disadvantages of this method: (1) The product quality is unstable, and only about 50% of the excellent grade and electronic grade products
The remaining primary and secondary products are sold at low prices, and the sales are even more difficult, which restricts the development
(2) Potassium ion source is potassium chloride, the cost is higher
(3) A large amount of by-product ammonium chloride wastewater is produced in the production process, the concentration is between 8% and 10%. Because the concentration is too low and the corrosion is large, it is difficult to recycle, causing environmental pollution and high energy consumption, which does not meet clean production Require
[0014] The main disadvantages of this method are large investment, high production cost, the need to introduce foreign technology and equipment, and high energy consumption, all of which restrict the application and development of ion membrane electrolytic carbonization in my country's potassium carbonate industry

Method used

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  • Method for preparing potassium carbonate by membrane method

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Effect test

Embodiment 1

[0036] figure 1 Schematically provided the flow chart of the method for preparing potassium carbonate by the membrane method of the embodiment of the present invention 1, as figure 1 Shown, the method for preparing salt of wormwood by described membrane method may further comprise the steps:

[0037] (A1) Dissolving ammonium bicarbonate and potassium sulfate in water at 0-50°C, the concentration of potassium sulfate in the mixed solution is 8-15wt%, and the concentration of ammonium bicarbonate is 10-30wt%;

[0038] (A2) The mixed solution passes through the nanofiltration membrane, the monovalent ions in the mixed solution selectively permeate the membrane, and the divalent ions are intercepted by the membrane: the main ion in the permeate is K + , NH 4 + 、HCO 3 - , the main ion of the intercepted concentrated solution is K + , NH 4 + , SO 4 2- , and a small amount of HCO 3 - ;The temperature of the mixed solution passing through the membrane is 10-50°C, and the p...

Embodiment 2

[0049] According to the application example of the preparation method in Example 1 of the present invention, in this application example, the preparation method is specifically:

[0050] (A1) Dissolve ammonium bicarbonate and potassium sulfate in water at 40°C, the concentration of potassium sulfate in the mixed solution is 10wt%, and the concentration of ammonium bicarbonate is 25wt%;

[0051] (A2) The mixed solution passes through the nanofiltration membrane, the monovalent ions in the mixed solution selectively permeate the membrane, and the divalent ions are intercepted by the membrane: the main ion in the permeate is K + , NH 4 + 、HCO 3 - , the main ion of the intercepted concentrated solution is K + , NH 4 + , SO 4 2- , and a small amount of HCO 3 - ;The temperature of the mixed solution passing through the membrane is 40°C and the pressure is 12MPa;

[0052] (A3) Heating and concentrating the permeate to precipitate potassium bicarbonate crystals, specificall...

Embodiment 3

[0059] According to the application example of the preparation method in Example 1 of the present invention, in this application example, the preparation method is specifically:

[0060] (A1) Dissolve ammonium bicarbonate and potassium sulfate in water at 20°C, the concentration of potassium sulfate in the mixed solution is 8wt%, and the concentration of ammonium bicarbonate is 15wt%;

[0061] (A2) The mixed solution passes through the nanofiltration membrane, the monovalent ions in the mixed solution selectively permeate the membrane, and the divalent ions are intercepted by the membrane: the main ion in the permeate is K + , NH 4 + 、HCO 3 - , the main ion of the intercepted concentrated solution is K + , NH 4 + , SO 4 2- , and a small amount of HCO 3 - ; The temperature of the mixed solution passing through the membrane is 20°C and the pressure is 6MPa;

[0062] (A3) Heating and concentrating the permeate to precipitate potassium bicarbonate crystals, specifically...

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Abstract

The invention provides a method for preparing potassium carbonate through a film method. The method includes the following steps of A1, preparing a mixed solution of ammonium bicarbonate and potassium sulphate; A2, making the mixed solution pass through a film, so monovalent ions in the mixed solution selectively permeate the film and divalent ions are intercepted by the film; A3, heating and concentrating permeating liquid, and separating out potassium carbonate crystals; A4, roasting the potassium carbonate crystals to prepare potassium carbonate. The method has the advantages that the product purity is high and reaction is easy to control.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to an improved preparation method of potassium carbonate, in particular to a method for preparing potassium carbonate by membrane method. Background technique [0002] At present, the preparation method of potassium carbonate mainly contains following two kinds: [0003] The ion exchange method, which was successfully developed by Shandong Province in the early 1970s, played an important role in the development of my country's potassium carbonate industry. At present, most domestic potassium carbonate production plants adopt this method. This method mainly uses ammonium bicarbonate and potassium chloride as raw materials, and prepares potassium bicarbonate and ammonium chloride solutions through cation exchange resins. Get the finished product. The reaction formula (wherein R is the resin molecular skeleton part) is as follows: [0004] RNa + KCl —— RK + NaCl adsorption [0005...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D7/12C01D7/22
CPCC01D7/123C01D7/22C01P2006/80
Inventor 李君占
Owner BEIJING NEWBIOLINK TECH DEV