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 hig

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

Examples

Experimental program
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Example Embodiment

[0034] In the preparation process of soda ash, it generally goes through the following process steps: ① Preparation of ammonia brine; ② Ammonia brine carbonation reaction and crystallization to obtain a solid-liquid mixture; ③ Filtration of the solid-liquid mixture to obtain a crude heavy alkali solid; ④ Crude heavy alkali calcination decomposition Get soda ash. Among them, the main component of crude alkali is NaHCO 3 , And will contain a certain amount of NH 4 HCO 3 And NaCl, then 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 component of the decomposition gas is a mixed gas of carbon dioxide, water vapor and ammonia. 2 Can be used as Na 2 CO 3 The reaction gas of the carbonation crystallization reaction can be purified to remove water vapor and ammonia in the decomposition gas to obtain high-purity carbonized gas. This method can n...

Example Embodiment

[0065] Example 1

[0066] Such as figure 1 As shown, this embodiment is a sodium bicarbonate production equipment, including a mixer 10, a heat exchanger 20, a decomposition tower 30, a reaction crystallizer 40, and a centrifuge 50 connected in sequence, and the liquid flows sequentially from the mixer 10 After the heat exchanger 20, the decomposition tower 30, the reaction crystallizer 40 and the centrifuge 50. The liquid outlet of the centrifuge 50 is connected to the mixer 10. Among them, the reaction crystallizer 40 is an OSL crystallizer.

[0067] In addition, the gas outlet of the decomposition tower 30 is connected to the gas inlet of the heat exchanger 20, the gas outlet of the heat exchanger 20 is connected to the gas inlet of the condenser 21, and the gas outlet of the condenser 21 is connected to the gas inlet of the scrubber 22 for scrubbing. The gas outlet of the device 22 is connected to the inlet of the compressor 23, and the outlet of the compressor 23 is connecte...

Example Embodiment

[0069] Example 2

[0070] This embodiment is a method for producing sodium bicarbonate, which uses the production equipment provided in embodiment 1. figure 2 The process flow of the production method is shown. In the method, the crude heavy alkali produced during the production of soda ash is used as the 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 includes the following steps:

[0071] a) In a mixer, dissolve the crude heavy base in a saturated solution of sodium bicarbonate, mix well to obtain a solid-liquid mixture, dissolve the crude heavy base with a saturated solution of sodium bicarbonate to facilitate the precipitation of sodium bicarbonate crystals in the subsequent process; , 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 decomposition tower. In the decomposition towe...

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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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