Process for preparing sodium carbonate crystal by wet pyrolysis of sodium bicarbonate solid

A technology of sodium bicarbonate solid and sodium carbonate, applied in carbonate preparations, alkali metal carbonates, chemical instruments and methods, etc., can solve problems such as long time and unreasonable economy, and achieve high decomposition rate, high concentration High and easy recycling effect

Pending Publication Date: 2021-11-09
杨仁春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal decomposition of sodium bicarbonate in aqueous solution is a reversible reaction. With the increase of the amount of generated sodium carbonate, the concentration of sodium carbonate increases. When the concentration of sodium carbonate reaches about 17%, it will reach a dynamic equilibrium with the residual sodium bicarbonate. , the theoretical decomposition rate of sodium bicarbonate is 93%, but it takes a long time for actual production to reach the theoretical value, which is unreasonable economically, and is usually controlled at about 85% in industry; and, the sodium carbonate obtained by wet decomposition is in a solution state, It needs to be evaporated and concentrated to obtain sodium carbonate solid

Method used

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  • Process for preparing sodium carbonate crystal by wet pyrolysis of sodium bicarbonate solid

Examples

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Effect test

Embodiment 1

[0040] A kind of technology that sodium bicarbonate solid wet pyrolysis prepares sodium carbonate crystal, comprises the following steps:

[0041] S1: In 100 parts by weight of sodium chloride-sodium carbonate double saturated solution, while stirring and heating, slowly add 108 parts by weight of sodium bicarbonate solid;

[0042] S2: After adding the material, continue to stir and heat up to 90 ° C, when no carbon dioxide gas is generated, stop heating;

[0043] S3: Cool and filter to obtain sodium carbonate monohydrate crystals.

[0044] In S1, the method for preparing sodium chloride-sodium carbonate double saturated solution: add excessive sodium chloride, sodium carbonate solid in water, stir to form double saturated solution, filter out unnecessary sodium chloride, sodium carbonate solid, filtrate is Sodium chloride-sodium carbonate double saturated solution.

[0045] Such as figure 1 Shown, in the preparation technology of the present invention, sodium chloride-sodi...

Embodiment 2

[0053] A kind of technology that sodium bicarbonate solid wet pyrolysis prepares sodium carbonate crystal, comprises the following steps:

[0054] S1: In 100 parts by weight of sodium chloride-sodium carbonate double saturated solution, while stirring and heating, slowly add 108 parts by weight of sodium bicarbonate solid;

[0055] S2: After adding the material, continue to stir and heat up to 118 ° C, when no carbon dioxide gas is generated, stop heating;

[0056] S3: Cool and filter to obtain sodium carbonate monohydrate crystals.

[0057] The preparation method of the sodium chloride-sodium carbonate double-saturated solution is the same as that of Example 1, and will not be repeated.

[0058] In the preparation process of the embodiment of the present invention, in S2, the temperature is raised to 118°C. Since the boiling point of brine is higher than that of water, and as the concentration of brine increases, the boiling point will also increase, and the sodium chloride-...

Embodiment 3

[0060] A kind of technology that sodium bicarbonate solid wet pyrolysis prepares sodium carbonate crystal, comprises the following steps:

[0061] S1: In 100 parts by weight of sodium chloride-sodium carbonate double saturated solution, while stirring and heating, slowly add 108 parts by weight of sodium bicarbonate solid;

[0062] S2: After adding the material, continue to stir and heat up to 100 ° C, when no carbon dioxide gas is generated, stop heating;

[0063] S3: Cool and filter to obtain sodium carbonate monohydrate crystals.

[0064] The preparation method of the sodium chloride-sodium carbonate double-saturated solution is the same as that of Example 1, and will not be repeated.

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Abstract

The invention discloses a process for preparing sodium carbonate crystals by wet pyrolysis of sodium bicarbonate solids, and belongs to the technical field of preparation of sodium carbonate crystals. The process comprises the following steps: S1, slowly adding a sodium bicarbonate solid into a sodium chloride-sodium carbonate double-saturated solution while stirring and heating; S2, after the materials are added, continuously stirring and heating to increase the temperature to 90-118 DEG C, and stopping heating when no carbon dioxide gas is generated; and S3, cooling and filtering to obtain sodium carbonate monohydrate crystals. The process is high in sodium bicarbonate decomposition rate and low in energy consumption, and the product is sodium carbonate solid.

Description

technical field [0001] The invention relates to the technical field of preparation of sodium carbonate crystals, in particular to a process for preparing sodium carbonate crystals by wet pyrolysis of sodium bicarbonate solids. Background technique [0002] Sodium bicarbonate is thermally decomposed to prepare sodium carbonate. Traditionally, there are two processes: [0003] 1. Dry process. Sodium bicarbonate solid is pyrolyzed in a rotary furnace at 180-220°C to obtain sodium carbonate solid. In this process, sodium bicarbonate is pyrolyzed into sodium carbonate, carbon dioxide and water vapor. The theoretical decomposition rate of sodium bicarbonate is 100%, but the heat transfer mode of this process is solid-solid heat transfer, which has low efficiency, high energy consumption, and Medium carbon dioxide concentration is low, not easy to recycle. [0004] 2. Wet process. Sodium bicarbonate is added to medium water to form a suspension, and it will be decomposed by hea...

Claims

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Application Information

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IPC IPC(8): C01D7/12
CPCC01D7/126Y02P20/141
Inventor 杨仁春
Owner 杨仁春
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