Preparation method of large-particle heavy baking soda

A large particle and baking soda technology, which is applied in bicarbonate preparation, alkali metal carbonate shape preparation, etc., can solve the problem of difficult control of supersaturation, and achieve the effect of increased output, simple process, and increased output

Active Publication Date: 2018-12-14
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing problems are as follows: (1) The baking soda factory established in the soda ash factory generally uses sweeping alkali and defective alkali as raw materials to prepare baking soda
CN104402023A discloses a production method for improving the particle size of the carbonization baking soda product. The method utilizes defective alkali as a raw material, adding baking soda as a crystal seed, and after the carbonization reaction, a part of it is thickened by a thickener and returned to the carbonization tower for circulation. In this way, a baking soda product with a larger particle size is produced, but there is also the problem that the degree of supersaturation is not easy to control

Method used

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  • Preparation method of large-particle heavy baking soda
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  • Preparation method of large-particle heavy baking soda

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Experimental program
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Effect test

Embodiment 1

[0043] A preparation method of large particle heavy baking soda, said method may further comprise the steps:

[0044] (1) Sodium carbonate solution and CO 2 Carry out carbonation reaction, obtain by 204g NaHCO 3 Solid and 1000ml solution (containing Na 2 CO 3 42g / L, NaHCO 3 146g / L) composition;

[0045] (2) The mixed material that step (1) is obtained joins in the reactor, adds 100g sodium carbonate wherein, crystallizes (insulation 2 hours) under 35 ℃, filters, and obtains large particle heavy baking soda.

Embodiment 2

[0047] A preparation method of large particle heavy baking soda, said method may further comprise the steps:

[0048] (1) Sodium carbonate solution and CO 2 Carry out carbonation reaction, obtain by 220g NaHCO 3 Solid and 1000ml solution (containing Na 2 CO 3 36g / L, NaHCO 3 122g / L);

[0049] (2) Add the mixture obtained in step (1) into a crystallizer, add 12.2g of sodium carbonate and 20ppmDL-tartaric acid therein, crystallize at 10°C (insulated for 3 hours), and filter to obtain large particles of heavy baking soda.

Embodiment 3

[0051] A preparation method of large particle heavy baking soda, said method may further comprise the steps:

[0052] (1) Sodium carbonate solution and CO 2 Carry out carbonation reaction, obtain by 214g NaHCO 3 Solid and 1000ml solution (containing Na 2 CO 3 45g / L, NaHCO 3 153g / L) composition;

[0053] (2) The mixture that step (1) obtains is joined in the crystallizer, adds 120g sodium carbonate and 500ppm calcium chloride wherein, crystallization (insulated 3 hours) under 80 ℃, filters, and obtains large particle heavy baking soda.

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Abstract

The invention relates to a preparation method of large-particle heavy baking soda. The method comprises the following steps: performing a carbonization reaction on a sodium carbonate solution or a mixed solution of sodium carbonate and sodium bicarbonate and CO2, so as to obtain a mixture; and adding sodium carbonate and/or a solid and/or a solution of a mixture of sodium carbonate and sodium bicarbonate into the obtained mixture for crystallization and solid-liquid separation, so as to obtain the large-particle heavy baking soda. The sodium carbonate solution or the mixed solution of sodium carbonate and sodium bicarbonate can be prepared from heavy alkali in soda production. The preparation method is suitable for different baking soda manufacturing plants; and the baking soda is high inyield and large in particle size.

Description

technical field [0001] The invention belongs to the technical field of baking soda production, and relates to a method for preparing granular heavy baking soda. Background technique [0002] Baking soda (NaHCO 3 ) is an important inorganic chemical product, which is widely used in various industries such as chemical industry, medicine, food, feed and catalyst. The production methods of baking soda include trona method, double decomposition method and soda ash carbonation method. Among them, the soda ash carbonation method is the main production method in industry, that is, it is prepared through the carbonation reaction of sodium carbonate aqueous solution and carbon dioxide gas. At present, the basic technological process of producing baking soda by soda ash carbonation method is to use soda ash as raw material, and go through several parts such as soda ash, filtration and impurity removal, carbonization reaction, solid-liquid separation, drying and packaging. Its existi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/10C01D7/40
CPCC01D7/10C01D7/40C01P2004/60
Inventor 李志宝张妍王刚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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