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Device and technique for cyclically producing ammonium chloride from combined-soda-process semi-mother liquor II

A production process and semi-mother liquor technology, applied in ammonium halide and other directions, can solve problems such as affecting production, easy scarring of heat exchangers, etc., and achieve the effects of reducing production and operation costs, being beneficial to the production of combined alkali, and reducing the concentration of combined ammonium

Inactive Publication Date: 2015-05-13
DAHUA GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current combined alkali process adopts one-way cold analysis and salting out to produce ammonium chloride. The cold analysis production process is subject to the concentration of bound ammonium, and the lower the cold analysis temperature, the higher the ammonium chloride output, but at a lower temperature When ammonium chloride is precipitated, the heat exchanger is prone to scarring, and it is often necessary to stop the operation for cleaning, which affects production, and the cleaning fluid needs to be disposed of

Method used

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  • Device and technique for cyclically producing ammonium chloride from combined-soda-process semi-mother liquor II
  • Device and technique for cyclically producing ammonium chloride from combined-soda-process semi-mother liquor II
  • Device and technique for cyclically producing ammonium chloride from combined-soda-process semi-mother liquor II

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Effect test

Embodiment 1

[0038] figure 1 It is a schematic diagram of a device for producing ammonium chloride by circulating alkali and semi-mother liquor II. Such as figure 1 As shown, the outlet valve at the bottom of the semi-mother liquor II barrel 101 is connected with the semi-mother liquor II pump 201 through a pipeline 601, and the semi-mother liquor II pump 201 outlet valve is connected with the ammonia mother liquor I barrel 301 inlet valve through a pipeline 602, and is connected between the semi-mother liquor II barrel 101 and the semi-mother liquor II barrel 101 and A meter 401 is arranged between the semi-mother liquor II pumps 201 .

[0039] figure 2 It is a flow chart of the production process of ammonium chloride by circulating alkali and semi-mother liquor II.

[0040] A combined soda semi-mother liquor II cycle production process for ammonium chloride, taking 600,000 tons of combined soda system as an example,

[0041] In order to achieve the goal of no scarring in the heat ex...

Embodiment 2

[0049] image 3 It is another preferred combined alkali semi-mother liquor II cycle production ammonium chloride device schematic diagram. As shown in the figure, the outlet valve at the bottom of the semi-mother liquor II barrel 102 is connected to the semi-mother liquor II pump 202 through a pipeline 603, and the semi-mother liquor II pump 202 outlet valve communicates with the mixing pipeline 801 through a pipeline 604, and is connected between the semi-mother liquor II barrel 102 and the semi-mother liquor Meter 402 is set between II pumps 202; the outlet valve at the bottom of ammonia mother liquid I barrel 302 is connected with ammonia mother liquid I pump 203 through pipeline 605, and the outlet valve of ammonia mother liquid I pump 203 is communicated with mixing pipeline 801 through pipeline 606.

[0050] A combined soda semi-mother liquor II cycle production process for ammonium chloride, taking 600,000 tons of combined soda system as an example,

[0051] In order t...

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Abstract

The invention relates to a device and technique for cyclically producing ammonium chloride from combined-soda-process semi-mother liquor II, belonging to the field of combined-soda process industry. The technique comprises the following steps: cyclically feeding semi-mother liquor II subjected to cold precipitation into mother liquor I so that the concentration of combined ammonium in the mother liquor I is reduced by at least 2tt; and partially circulating the semi-mother liquor II to reduce the concentration of combined ammonium in the ammonium mother liquor I, so that ammonium chloride in the ammonium mother liquor I can not scar in the heat exchanger under the condition of the same cold precipitation temperature, thereby producing more ammonium chloride on the premise of controlling the heat exchanger not to scar.

Description

technical field [0001] The invention relates to a device and process for producing ammonium chloride in a combined soda semi-mother liquor II cycle, and belongs to the field of combined soda production industry. Background technique [0002] In the production process of soda ash produced by the combined soda production method, the ammonia mother liquor I is obtained after the mother liquor I after the heavy alkali is prepared, and the process parameters are adjusted by absorbing ammonia. The solubility of ammonium chloride is changed by the temperature change, so that part of the chlorine in the ammonia mother liquor I can be changed. Ammonium chloride crystallizes out, which is cold precipitation. The semi-mother liquor II obtained by cold analysis is salted out to obtain ammonium chloride and mother liquor II, and the mother liquor II enters the heavy alkali production process after absorbing ammonia, thus forming two product cycles. [0003] The current combined alkali p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/16
Inventor 高志兴李树春闫成华张伟吴献民
Owner DAHUA GROUP
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