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Method for producing potassium bicarbonate through self-carbonization multiple-effect cross flow continues evaporation crystallization

A technology of potassium bicarbonate and evaporation crystallization, which is applied in the fields of chemical industry, resources and environment, and can solve problems such as steam consumption that cannot be solved well

Active Publication Date: 2012-06-27
ZHEJIANG DAYANG BIOTECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The downstream evaporation plus continuous evaporation and crystallization process solves the corrosion problem of the first-effect evaporator due to the harsh operating environment of high temperature and high concentration, but it does not solve the problem of high steam consumption.

Method used

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  • Method for producing potassium bicarbonate through self-carbonization multiple-effect cross flow continues evaporation crystallization
  • Method for producing potassium bicarbonate through self-carbonization multiple-effect cross flow continues evaporation crystallization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1, a kind of self-carbonization multi-effect cross-flow continuous evaporation crystallization produces the method for potassium bicarbonate, carries out following steps successively:

[0067] 1. Set potassium bicarbonate ion exchange solution containing ammonium bicarbonate in liquid storage tank I1, the concentration of ammonium bicarbonate is 50g / L, the concentration of potassium bicarbonate is 230g / L; the rest is water.

[0068] The potassium bicarbonate mother liquor that contains potassium carbonate is set in liquid storage tank II2; The concentration of potassium carbonate is 120g / L, and the concentration of potassium bicarbonate is 420g / L; All the other are water.

[0069] After the above-mentioned potassium bicarbonate ion-exchange solution and potassium bicarbonate mother liquor are mixed according to the volume flow ratio of 5: 2, the mixed feed liquid is obtained; the mixed feed liquid contains ammonium bicarbonate 30g / L, contains potassium carbona...

Embodiment 2

[0090] Embodiment 2, a kind of method (working flow is the same as embodiment 1) that self-carbonization multi-effect cross-flow continuous evaporation crystallization produces potassium bicarbonate:

[0091] 1. Set potassium bicarbonate ion exchange solution containing ammonium bicarbonate in liquid storage tank I1, the concentration of ammonium bicarbonate is 50g / L, the concentration of potassium bicarbonate is 230g / L; the rest is water.

[0092] The potassium bicarbonate mother liquor that contains potassium carbonate is set in liquid storage tank II2; The concentration of potassium carbonate is 120g / L, and the concentration of potassium bicarbonate is 420g / L; All the other are water.

[0093] After the above-mentioned potassium bicarbonate ion-exchange solution and potassium bicarbonate mother liquor are mixed according to the volume flow ratio of 5: 2, the mixed feed liquid is obtained; the mixed feed liquid contains ammonium bicarbonate 30g / L, contains potassium carbonate...

Embodiment 3

[0113] Embodiment 3: a kind of method (working flow is the same as embodiment 1) that produces potassium bicarbonate from carbonization multi-effect cross-flow continuous evaporation crystallization:

[0114] 1. Set potassium bicarbonate ion exchange solution containing ammonium bicarbonate in liquid storage tank I1, the concentration of ammonium bicarbonate is 50g / L, the concentration of potassium bicarbonate is 230g / L; the rest is water.

[0115] The potassium bicarbonate mother liquor that contains potassium carbonate is set in liquid storage tank II2; The concentration of potassium carbonate is 120g / L, and the concentration of potassium bicarbonate is 420g / L; All the other are water.

[0116] After the above-mentioned potassium bicarbonate ion-exchange solution and potassium bicarbonate mother liquor are mixed according to the volume flow ratio of 5: 2, the mixed feed liquid is obtained; the mixed feed liquid contains ammonium bicarbonate 30g / L, contains potassium carbonate...

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Abstract

The invention discloses a method for producing potassium bicarbonate through self- carbonization multiple-effect cross flow continues evaporation crystallization, comprising the following steps: mixing a potassium bicarbonate ion exchange solution containing ammonium bicarbonate with a potassium bicarbonate mother solution containing potassium carbonate to obtain a mixed feed liquid; preheating the feed liquid, then putting the preheated feed liquid into a desorption self-carbonization tower to carrying out low temperature desorption self-carbonization; letting the feed liquid flowing out from the desorption self-carbonization tower successively enter an III-effect evaporator, an II-effect evaporator, an I-effect evaporator and an IV-effect evaporator for processing to obtain a solid-liquid mixture; separating the obtained solid-liquid mixture by a centrifugal machine to obtain potassium bicarbonate crystals and a potassium bicarbonate mother liquid containing potassium carbonate; drying and sieving the potassium bicarbonate crystals by a drying machine, and then packaging and putting in storage; and respectively putting the potassium bicarbonate mother liquid containing potassium carbonate into the II-effect evaporator and a liquid storage tank II. According to the invention, the energy consumption in the process of potassium bicarbonate evaporation can be remarkably reduced, and the particle size in the crystallization of potassium bicarbonate and the product quality are improved or controlled.

Description

technical field [0001] The invention relates to the technical fields of chemical industry, resource and environment, in particular to a method for producing potassium bicarbonate by self-carbonization multi-effect cross-flow continuous evaporation and crystallization. Background technique [0002] Potassium bicarbonate is an important chemical raw material, mainly used to produce potassium carbonate, potassium acetate, potassium arsenite, etc. It is also used in medicine, food, agriculture and fire extinguishing agent industries. Potassium bicarbonate has been widely used in recent years It is used as a food loosening agent and quality improver, and its development is getting more and more attention. Potassium bicarbonate is the raw material for the production of potassium carbonate. Potassium carbonate is widely used in chemical industry, light industry, picture tube glass bulb, pharmaceutical, food, welding rod and non-ferrous metal metallurgy and other industries. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00
Inventor 王国平钱雪明陈阳贵汪贤玉涂永福关卫军钱建春何官明仇玉娟曾邵平
Owner ZHEJIANG DAYANG BIOTECH GROUP
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