Ammonia distillation device and technology by mother liquor and total ash powder with alkaline method

An ammonia-alkali method and mother liquor technology, which is applied in the ammonia-alkali method mother liquor whole ash powder ammonia steaming device and process field, can solve the problems of fluctuating tower conditions, unable to make full use of quicklime digestion reaction heat, complicated operation, etc., and avoid back-mixing and reconciliation. The effect of full utilization of liquid and heat of digestion and simple process flow

Inactive Publication Date: 2014-04-02
TANGSHAN SANYOU CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]① still need to use part of lime milk, can not make full use of quicklime digestion reaction heat; The processing capacity of the distillation tower is improved; ③The sand discharge process is easy to cause fluctuations in the tower conditions, and there is also a potential safety hazard that the high-temperature ammonia-containing sand liquid is easy to splash and overflow and hurt people; Disadvantages of waiting more

Method used

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  • Ammonia distillation device and technology by mother liquor and total ash powder with alkaline method
  • Ammonia distillation device and technology by mother liquor and total ash powder with alkaline method
  • Ammonia distillation device and technology by mother liquor and total ash powder with alkaline method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] See attached figure 2 As shown in , the outlet at the bottom of the second flash tank 9 is connected to the second discharge line 14, and the second discharge line 14 is directly connected to the waste liquid feeding pump 15; the pre-ash bucket 4 is directly connected to the distillation tower 8 through the blending line 11; The pre-ash bucket 4 is provided with a preheating mother liquor inlet and a lime powder inlet.

[0031] A pH value analysis device 5 is installed on the blending pipeline 11 . The use of the PH value online analysis device 5 and the speed-regulating ash auger 2 can control the finer lime powder particle size, achieve the purpose of streamlining the process, convenient operation and strong controllability, and has the advantages of safety and energy saving. Reduce staff occupancy.

[0032] A flash tank 7 is connected to the bottom of the distillation tower 8 through a heat pump 6; the distillation tower 8 is provided with a low-pressure steam inl...

Embodiment 2

[0041] The difference with Example 1 is:

[0042] 185 cubic meters of preheated mother liquor enters the pre-ash bucket 4 from the top by spraying, and analyzes the data online according to the PH value online analysis device 5 installed on the blending pipeline. 3. Send 45 tons of lime powder into the pre-ash bucket 4, stir, mix and react in the pre-ash bucket 4, and the ammonia formed by the reaction is sent out from the top of the pre-ash bucket 4, and used for other processes after cooling treatment.

[0043] The reaction liquid in the pre-ash tank 4 flows into the fixed ammonia distillation tower 8, and contacts and exchanges heat with the steam entering from the lower part. When the outlet temperature is 90°C, the ammonia in the liquid phase is evaporated, and the ammonia is output from the top of the distillation tower 8, and is cooled. Afterwards, it is used in other processes, and the calcium hydroxide containing 1.75ti and 90mg / l waste liquid flow out from the bottom...

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Abstract

The invention relates to an ammonia distillation device and technology, in particular to an ammonia distillation device and technology by mother liquor and total ash powder with an alkaline method. According to the device and the technology, a bottom end outlet of a second flash tank is connected with a second layout pipeline which is directly connected with a waste liquor charging pump; the preheated mother liquor and lime powder are blended in proportion, sent to a preliming barrel, stirred and mixed and react in the preliming barrel, and ammonia formed by the reaction is sent out from the top end of the preliming barrel and used for other procedures after cooling treatment; and a reaction liquid of the preliming barrel flows into a fixed ammonia distillation column and is in countercurrent contact for heat exchange with steam entering from the lower part, and ammonia in a liquid phase is distilled, output from the top of the distillation column and used for other procedures after cooling treatment. Compared with the prior art, lime milk is not used, total ash powder distillation operation is achieved truly, surplus lime is controlled, lime milk flow is not needed to regulate, besides, heat utilization of quick lime slaking is sufficient, and the capacity of the distillation column is increased.

Description

[0001] technical field [0002] The invention relates to an ammonia distillation device and a process, in particular to an ammonia distillation device and a process for ammonia-alkali method mother liquor whole ash powder ammonia distillation. Background technique [0003] Ammonia-soda method is one of the main methods for the manufacture of synthetic soda ash. In the process of distilling ammonia from mother liquor in the production process, the process operation methods adopted are divided into two categories. One is steaming ammonia from gray milk, that is, the mother liquor is pre-distilled to remove part of free ammonia and CO 2 Afterwards, metathesis reaction is carried out with the milk of lime obtained by digesting quicklime, and the combined ammonia in the mother liquor is converted into free ammonia, which is driven out by steam heating for recovery. The other is steaming ammonia from ashes, that is, the mother liquor is pre-distilled to remove part of free ammonia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/20
Inventor 李兴生李树兴郑俊兴刘海英刘伯轩赵海刘冠辰吕静孙秋菊韩园园王欢
Owner TANGSHAN SANYOU CHEM IND
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