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Method for preparing baking soda by metathesis

A metathesis, baking soda technology, applied in carbonate preparations and other directions, can solve the problems of reduced utilization rate of raw material ammonium bicarbonate, reduced ammonium bicarbonate dissolution rate, increased ammonia content of baking soda, etc. Dissolution speed and the effect of improving the degree of utilization

Pending Publication Date: 2019-09-27
武汉德泽环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Solid ammonium bicarbonate goes through two processes when it enters saturated or nearly saturated sodium salt solution: the dissolution process and the double decomposition reaction process; during the dissolution process, the dissolved ammonium bicarbonate reacts with the sodium ions in the sodium salt solution to form solid bicarbonate Sodium, causing part of the solid sodium bicarbonate to adhere to the surface of undissolved solid ammonium bicarbonate, on the one hand causes the dissolution rate of ammonium bicarbonate to decrease, and on the other hand causes peritectic (solid sodium bicarbonate wraps solid ammonium bicarbonate); Ammonium bicarbonate enters the product baking soda along with solid sodium bicarbonate, the ammonia content of baking soda increases, the application of baking soda is restricted, and sales are difficult. At the same time, the utilization rate of raw material ammonium bicarbonate decreases, and the production cost rises sharply

Method used

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  • Method for preparing baking soda by metathesis
  • Method for preparing baking soda by metathesis
  • Method for preparing baking soda by metathesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 Shown is a method for preparing baking soda by metathesis, the metathesis reactor 1 takes out the liquid and enters the centrifuge 3 of the solid-liquid separator, and the solid sodium bicarbonate separated by the centrifuge 3 of the solid-liquid separator enters the subsequent production process of baking soda The solution C separated by the centrifuge 3 of the solid-liquid separator enters the filtrate storage tank 4, the solution C1 of the filtrate storage tank 4 enters the ammonium bicarbonate dissolver 5, and the solution C2 of the filtrate storage tank 4 enters the ammonium salt production process; The raw material solid ammonium bicarbonate is added to the ammonium bicarbonate dissolver 5, and the solution A1 of the ammonium bicarbonate dissolver 5 enters the metathesis reactor 1; the saturated or nearly saturated solution A2 of the raw material sodium salt enters the metathesis reactor 1; the ammonium bicarbonate and The sodium salt undergoes a ...

Embodiment 2

[0034] Such as figure 2Shown is a method for preparing sodium bicarbonate by metathesis, the metathesis reactor 1 takes out the liquid and enters the thickener 2 of the solid-liquid separator, and the clear solution C1 overflowing from the thickener 2 of the solid-liquid separator enters ammonium bicarbonate Dissolver 5, the crystal slurry at the bottom of the thickener 2 of the solid-liquid separator enters the centrifuge 3 of the solid-liquid separator, and the solid sodium bicarbonate separated by the centrifuge 3 of the solid-liquid separator enters the subsequent production process of baking soda; The solution C2 separated by the centrifuge 3 of the liquid separator enters the filtrate storage tank 4, and the solution C2 exiting the filtrate storage tank 4 enters the ammonium salt production process; the raw material solid ammonium bicarbonate is added to the ammonium bicarbonate dissolver 5, and the ammonium bicarbonate is dissolved Solution A1 of device 5 enters metath...

Embodiment 3

[0039] Such as image 3 Shown is a method for preparing baking soda by metathesis, the metathesis reactor 1 takes out the liquid and enters the thickener 2 of the solid-liquid separator, and the clear solution overflowing from the upper part of the thickener 2 of the solid-liquid separator enters the filtrate storage tank 4 , the crystal slurry at the bottom of the thickener 2 of the solid-liquid separator enters the centrifuge 3 of the solid-liquid separator, and the solid sodium bicarbonate separated by the centrifuge 3 of the solid-liquid separator enters the subsequent production process of baking soda; the solid-liquid separator The solution separated by the centrifuge 3 enters the filtrate storage tank 4, the solution C1 that goes out of the filtrate storage tank 4 enters the ammonium bicarbonate dissolver 5, and the solution C2 that goes out of the filtrate storage tank 4 enters the ammonium salt production process; the raw material solid ammonium bicarbonate is added A...

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Abstract

The invention provides a method for preparing baking soda by metathesis. The method is characterized in that a solution C obtained after separating solid sodium hydrogen carbonate from metathesis reactor extraction liquid B by a solid-liquid separator is divided into two parts of C1 and C2, the solution C1 enters an ammonium hydrogen carbonate dissolver, and the solution C2 enters an ammonium salt production process; the solid sodium hydrogen carbonate separated from the metathesis reactor extraction liquid B by the solid-liquid separator enters the subsequent production process of the baking soda; raw material solid ammonium hydrogen carbonate is added into the ammonium hydrogen carbonate dissolver, and a solution A1 discharged out of the ammonium hydrogen carbonate dissolver enters a metathesis reactor; a saturated or nearly-saturated solution A2 of a raw material sodium salt enters the metathesis reactor; the ammonium hydrogen carbonate and the sodium salt are subjected to a metathesis reaction in the metathesis reactor to produce the sodium hydrogen carbonate. By adopting a process provided by the invention, the utilization rate can reach 99.6% or above, the production cost is reduced, the amount of the solid ammonium hydrogen carbonate entering the product baking soda along with the sodium hydrogen carbonate is reduced, the ammonia content of the product baking soda is lowered, and the situation of sale difficulty of the baking soda is solved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method and a device for preparing sodium bicarbonate by metathesis. Background technique [0002] Conventional metathesis method for preparing baking soda, the method of adding solid ammonium bicarbonate directly into saturated or nearly saturated sodium salt solution for metathesis reaction, solid ammonium bicarbonate is submerged or suspended in saturated or nearly saturated sodium salt solution before dissolving Simultaneous metathesis reaction. [0003] Solid ammonium bicarbonate goes through two processes when it enters saturated or nearly saturated sodium salt solution: the dissolution process and the double decomposition reaction process; during the dissolution process, the dissolved ammonium bicarbonate reacts with the sodium ions in the sodium salt solution to form solid bicarbonate Sodium, causing part of the solid sodium bicarbonate to adhere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/02
CPCC01D7/02
Inventor 张颖芃陈子豪李佳璇
Owner 武汉德泽环保科技有限公司
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