Process for producing food grade saleratus by double decomposition

A process method and technology of baking soda, which are applied in the field of metathesis to produce food-grade baking soda, can solve the problems of increased water loss of baking soda, metathesis reaction, and difficulty in controlling the growth of baking soda crystal particles, etc., and achieve fast reaction rate and energy saving Cost, Effect of Prolonged Response Time

Inactive Publication Date: 2010-04-21
湖南裕华科技集团股份有限公司
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Problems solved by technology

Its metathesis reaction is carried out continuously in the primary stirring vessel, and the metathesis reaction and the growth of sodium bicarbonate crystal particles are difficult to control; in addition, the metathesis product directly and continuously enters the centrifuge for separation and washing, in order to remove ammonium chloride and then reach the required sodium bicarbonate. The purity needs to use a lot of washing water
At the same time, due to repeated washing, the final product baking soda will also increase in the amount of water lost during the washing process.

Method used

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  • Process for producing food grade saleratus by double decomposition
  • Process for producing food grade saleratus by double decomposition

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Embodiment 1

[0035] Take mineral salt brine, add sodium carbonate and caustic soda to remove Ca 2+ , Mg 2+ After clarification and purification, the brine flow rate is 65m 3 / h, containing NaCl305g / L, adding 0.1 tons of sodium carbonate and caustic soda / hour, then heating to 32℃~35℃, after purification, Ca 2+ , Mg 2 + Content below 20mg / l;

[0036] After purification, the brine and ammonium bicarbonate are synchronously added to the first-stage reaction kettle at a mass ratio of 3:1 (feeding ratio) to react to form sodium bicarbonate crystals and sodium bicarbonate. + , NH 4 + Cl - 、HCO 3 - 、H 2 The mother liquor of the five-phase system of O, the reaction time is 3 to 10 minutes, and the feeding amount of the first stage reactor is 4.5m 3 , the stirring speed is 50-60 rpm;

[0037] The product of the first-stage reactor enters the second-stage reactor, the reaction time is 25-35 minutes, and the feeding amount of the second-stage reactor is 30m 3 , the amount of sodium chlori...

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Abstract

The invention relates to a process for producing food grade saleratus by double decomposition. The food grade saleratus is produced through a double decomposition reaction of natural brine and ammonium bicarbonate by using the process comprising the following steps: brine refining, double decomposition reaction, thickening, filtering, centrifugal separation and drying. A three-stage reaction process is adopted for the double decomposition reaction, and a kettle type machine is used for stirring a reaction barrel; a vacuum belt type filter is used for filtration washing, and washing water can be utilized for multiple times. The food grade saleratus product has good quality, easy control of the double decomposition reaction, small washing water quantity and low production cost.

Description

technical field [0001] The invention relates to a process method for producing food-grade baking soda by metathesis, which produces food-grade baking soda by metathesis reaction of natural brine and ammonium bicarbonate, and has the characteristics of simple process, high product quality and low cost. Background technique [0002] Food-grade baking soda is generally produced in China by soda ash carbonization method, which has complicated process, large investment and high energy consumption. Another method is the metathesis production of sodium chloride and ammonium bicarbonate. The metathesis production method generally has shortcomings such as unstable quality, fine and uneven particles, and poor activity. [0003] Chinese patent CN 101185484A discloses a "continuous program-controlled metathesis food-grade baking soda production process", which realizes continuous production. Its metathesis reaction is carried out continuously in the first-stage stirring container, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/02
Inventor 刘常松刘建军谢超群刘拥军晏清平滕隆
Owner 湖南裕华科技集团股份有限公司
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