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Production method and production equipment for sodium bicarbonate

A sodium bicarbonate and production method technology, applied in the field of sodium bicarbonate preparation, can solve the problems of ineffective utilization of CO, environmental pollution, high cost, etc.

Pending Publication Date: 2018-11-02
BEIJING EDGEIN TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The first object of the present invention is to provide a kind of production method of sodium bicarbonate, to solve the waste of resources that existing production method of sodium bicarbonate causes, pollute the environment, the problem of high energy consumption and high cost
[0008] The second object of the present invention is to provide a kind of production equipment of sodium bicarbonate, can't effectively utilize CO to alleviate existing production equipment of sodium bicarbonate 2 , and the problems of high energy consumption and high cost

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  • Production method and production equipment for sodium bicarbonate
  • Production method and production equipment for sodium bicarbonate

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preparation example Construction

[0034] During the preparation of soda ash, the following process steps are generally followed: ① Preparation of ammonia brine; ② Carbonation reaction and crystallization of ammonia brine to obtain a solid-liquid mixture; ③ Filtration of the solid-liquid mixture to obtain a crude heavy alkali solid; ④ Calcination and decomposition of crude heavy alkali Get soda ash. Among them, the main component of crude heavy alkali is NaHCO 3 , will also contain a certain amount of NH4 HCO 3 and NaCl, after which the crude heavy alkali is calcined to obtain soda ash Na 2 CO 3 . A large amount of decomposition gas will be produced during the calcination and decomposition of crude heavy alkali. The main components of the decomposition gas are the mixed gas of carbon dioxide, water vapor and ammonia. Due to the 2 can be used as Na 2 CO 3 The reaction gas of the carbonation crystallization reaction, so through the purification treatment of the decomposition gas to remove the water vapor an...

Embodiment 1

[0066] Such as figure 1 Shown, present embodiment is a kind of production equipment of sodium bicarbonate, comprises mixer 10, heat exchanger 20, decomposition tower 30, reaction crystallizer 40 and centrifuge 50 connected successively, and liquid begins to flow sequentially from mixer 10 Through heat exchanger 20, decomposition tower 30, reaction crystallizer 40 and centrifuge 50. The liquid outlet of the centrifuge 50 is connected to the mixer 10 . Wherein, the reaction crystallizer 40 is an OSL crystallizer.

[0067] In addition, the gas outlet of decomposition tower 30 is connected with the gas inlet of heat exchanger 20, and the gas outlet of heat exchanger 20 is connected with the gas inlet of condenser 21, and the gas outlet of condenser 21 is connected with the gas inlet of scrubber 22, washing The gas outlet of device 22 is connected with the inlet of compressor 23, and the outlet of compressor 23 is connected with the gas inlet of reaction crystallizer 40, and decomp...

Embodiment 2

[0070] Present embodiment is a kind of production method of sodium bicarbonate, utilizes the production equipment that embodiment 1 provides to produce, figure 2 The technological process of this production method is shown, in this method, the crude heavy alkali that produces in the soda ash production process is used as raw material, and its main component is: 70.88% NaHCO 3 , 7.02% Na 2 CO 3 , 4.14% NH 4 HCO 3 , 0.2% NaCl and 17.76% H 2 O, the specific production method comprises the following steps:

[0071] A) in mixer, thick heavy alkali is dissolved in the saturated solution of sodium bicarbonate, obtains solid-liquid mixture after mixing, dissolves thick heavy alkali with the saturated solution of sodium bicarbonate to be convenient to the separation out of sodium bicarbonate crystal in follow-up process; Wherein , the solid-liquid ratio of the solid-liquid mixture is 1:10;

[0072] b) The solid-liquid mixture flows through the heat exchanger and enters the decom...

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Abstract

Relating to the field of sodium bicarbonate preparation, the invention provides a production method and production equipment for sodium bicarbonate. The production method of sodium bicarbonate includes the steps of: a) providing solid-liquid mixture containing crude sodium bicarbonate as the reaction raw material, and decomposing the reaction raw material to obtain a decomposition solution containing sodium carbonate and decomposition gas containing CO2; b) subjecting the decomposition gas to purification treatment to obtain carbonization gas, and then introducing the carbonization gas into the decomposition solution for carbonation crystallization reaction, and then conducting solid-liquid separation to obtain sodium bicarbonate and recovered mother liquor. The production method providedby the invention can solve the problems of waste of resources, environmental pollution, high energy consumption and high cost caused by existing sodium bicarbonate production methods, and achieves thetechnical effects of increasing CO2 utilization rate, reducing environmental pollution, and lowering energy consumption and cost.

Description

technical field [0001] The invention relates to the field of preparation of sodium bicarbonate, in particular to a production method and production equipment of sodium bicarbonate. Background technique [0002] Sodium bicarbonate is commonly known as baking soda, and its molecular formula is NaHCO 3 . Sodium bicarbonate is a basic chemical raw material, widely used in food, chemical reagents, inorganic synthesis, medicine, leather, textile, dye industry, fire extinguishing agent, detergent, feed industry, environmental protection and agriculture and other fields. [0003] At present, in the production process of sodium bicarbonate, soda ash is mainly used as raw material, soda ash is dissolved with sodium bicarbonate filter alkali mother liquor, prepared into lye with appropriate concentration, heated to 80°C, filtered through a filter, and then entered into the carbonation tower for carbonation The carbonization gas is introduced into the tower to carry out the carbonatio...

Claims

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Application Information

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IPC IPC(8): C01D7/10C01D7/22
CPCC01D7/10C01D7/22
Inventor 孔德利唐印宋国天雷林龚元德刘朝慧
Owner BEIJING EDGEIN TECH
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