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Method for increasing crystal size of sodium bicarbonate

A technology of sodium bicarbonate and crystal size, which is applied in solution crystallization, heat exchange cooling crystallization, alkali metal carbonate shape preparation, etc., and can solve the problems that sodium bicarbonate cannot meet its requirements.

Active Publication Date: 2018-11-06
JIANGSU BAIJIAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some enterprises that have special requirements on particle size, such as sodium bicarbonate products with a particle size of 150-300 μm or even larger particle sizes, the sodium bicarbonate prepared by the traditional soda ash carbonation method cannot meet the requirements. Require

Method used

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  • Method for increasing crystal size of sodium bicarbonate
  • Method for increasing crystal size of sodium bicarbonate
  • Method for increasing crystal size of sodium bicarbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] by figure 1 The shown device for improving the sodium bicarbonate crystal grain size prepares sodium bicarbonate crystals.

[0055] Add 150-mesh (particle size3 A small flow rate of / h is introduced into the tank body 110 with a feed liquid temperature of about 40°C, and the circulating cooling flow rate of the outlet 113 of the circulating cooling feed liquid axial flow pump is set to 2.0m 3 / h, the feed liquid in the tank body 110 is drawn out and cooled to below 40°C by an external cooling device, and returned to the tank body 110 through the outlet 121 of the cooling feed liquid return pipe at the bottom of the central return pipe 120, so as to be slightly lower than the tank body The temperature of the feed liquid in 110 passes through the crystal slurry layer, the supersaturation disappears, and the crystal grows up. at 0.13m 3 The flow rate of / h draws the crystal slurry from the crystal slurry outlet 112, and the excess cleaning liquid in the tank body 110 flo...

Embodiment 2

[0057] by figure 1The shown device for improving the sodium bicarbonate crystal grain size prepares sodium bicarbonate crystals.

[0058] Add 150 mesh (particle size 3 The flow rate of / h is introduced into the tank body 110 with a feed liquid temperature of 40°C, and the circulating cooling flow rate of the outlet 113 of the circulating cooling feed liquid axial flow pump is set to 2.0m 3 / h, the feed liquid in the tank body 110 is drawn out and cooled to below 40°C by an external cooling device and returned to the tank body 110 through the outlet 121 of the cooling feed liquid return pipe at the bottom of the central return pipe 120 to be slightly lower than the tank body 110 The temperature of the inner material liquid passes through the crystal slurry layer, the supersaturation disappears, and the crystal grows up. 3 The flow rate of / h draws the crystal slurry from the crystal slurry outlet 112, and the excess cleaning liquid in the tank body 110 flows out from the overf...

Embodiment 3

[0060] by figure 1 The shown device for improving the sodium bicarbonate crystal grain size prepares sodium bicarbonate crystals.

[0061] Add 150 mesh (grain size 3 The flow rate of / h is introduced into the tank body 110 with a feed liquid temperature of about 40°C, and the circulating cooling flow rate of the outlet 113 of the circulating cooling feed liquid axial flow pump is set to 2.0m 3 / h, the feed liquid in the tank body 110 is drawn out and cooled to below 40°C by an external cooling device, and returned to the tank body 110 through the outlet 121 of the cooling feed liquid return pipe at the bottom of the central return pipe 120, so as to be slightly lower than the tank body The temperature of the feed liquid in 110 passes through the crystal slurry layer, the supersaturation disappears, and the crystal grows up. at 0.17m 3 The flow rate of / h draws the crystal slurry from the crystal slurry outlet 112, and the excess cleaning liquid in the tank body 110 flows out...

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Abstract

The invention discloses a method for increasing a crystal size of sodium bicarbonate. The method comprises the following steps: preparing a saturated solution or a supersaturated solution of sodium bicarbonate, introducing the saturated solution or the supersaturated solution of the sodium bicarbonate in an apparatus for increasing the crystal size of sodium bicarbonate through a raw material liquid inlet. The apparatus comprises a tank and a center back flow; and the raw material liquid inlet, a crystal mush outlet, a cycle cooling material liquid axial-flow pump outlet and an overflow port are arranged in the tank. the cycle cooling material liquid axial-flow pump outlet is arranged at an upper and upper part of the tank, and is used for leading the material liquid in the tank and cooling the material liquid; the center back flow is used for introducing the cooled material liquid in the tank, an outlet of cooling material liquid back flow pipe of the center back flow is arranged at amiddle and lower part of the tank, the cycle cooling of the material liquid is realized, a sodium bicarbonate product with a particle size being 180-380 [mu]m is prepared, and the requirement of thesodium bicarbonate product with the large particle size is satisfied.

Description

technical field [0001] The invention belongs to the technical field of sodium bicarbonate production, and in particular relates to a device and a method for increasing the crystal size of sodium bicarbonate. Background technique [0002] Sodium bicarbonate is often called baking soda, also known as acid sodium carbonate, which is white or opaque monoclinic crystals, the English name is Sodium Bicarbonate, and the chemical formula is NaHCO 3 , has a certain solubility in water. Sodium bicarbonate is an important inorganic chemical product, widely used in chemical industry, light industry, medicine, textile, food, fine chemical industry and other fields. [0003] my country is an important producer of sodium bicarbonate, and has formed a scale of more than one million tons so far. However, traditional sodium bicarbonate is mostly prepared by soda ash carbonation method, the main raw materials are soda ash and carbon dioxide, and its chemical reaction formula is: Na 2 CO 3 ...

Claims

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Application Information

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IPC IPC(8): C01D7/40B01D9/02
CPCB01D9/0004C01D7/40C01P2004/60
Inventor 顾正红杜维刚杨斌栗明钟健培宣宁董信志徐明陈劲松
Owner JIANGSU BAIJIAN ENVIRONMENTAL PROTECTION TECH CO LTD
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