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Ammonia-soda process mother liquid distillation tower scaring-proof method

A distillation tower and ammonia-alkali process technology, applied in the field of anti-scalding of ammonia-alkali process mother liquor distillation tower, can solve the problems of increased power consumption, unsatisfactory effect, low investment and the like

Active Publication Date: 2011-04-20
TANGSHAN SANYOU CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are either unsatisfactory in effect, or increase power consumption
So far, there is no technology with remarkable effect, low investment and low consumption.

Method used

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  • Ammonia-soda process mother liquid distillation tower scaring-proof method

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Embodiment Construction

[0008] Refer to attached figure 1 , the embodiment of the present invention is as follows:

[0009] The present invention includes a distillation tower 1 and a pre-ash bucket 8 , one end of the preheating mother liquid pipe 4 communicates with the distillation tower 1 , and the other end communicates with the pre-ash bucket 8 . One end of the blending liquid pipe 7 communicates with the pre-ash bucket 8 , the other end communicates with the distillation tower 1 , and the condensate pipe 6 communicates with the preheating mother liquid pipe 4 . The anti-scarring method of the distillation tower is: after the distillation tower 1 is turned on, the temperature of the preheated mother liquor in the distillation tower 1 should be kept at 95°C. Enter the small valve 10 of the preheating mother liquor pipe, and the condensate is metered with a flow meter or equipped with a thin tube of a certain diameter to ensure that the amount added is within the specified range. The flow rate o...

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Abstract

A scab resistance method of a mother liquor distillation tower by an ammonia-soda process includes the distillation tower and a preliming tank. After the distillation tower is opened and the liquid flows down, according to the proportion of the distillation tower mother liquor steam amount between 1 percent and 2 percent, a thin liquor containing CO2 and NH3 is added continuously into the preliming tank to react chemically with a lime milk Ca (OH) 2 in the preliming tank under the condition that the mother liquor is preheated to 95 DEG C. An impurity CaSO4 crystal is produced in the preliming tank. At the same time, a scab elimination agent is added to a preheated mother liquor pipe and enters into the preliming tank as the preheated mother liquor. The liquid flows from the preliming tank into the distillation tower. The preheated mother liquor is SO4<2->:0.72ti, CO2:1.8ti and the temperature is 95 DEG C. the thin liquor is NH3: 170ti, CO2: 48ti and the temperature is 60 DEG C. By using the present invention, the distillation tower has little scab and the operation of the tower is optimized. The present invention has the advantages of low steam consumption amount, short time of stopping the tower to clean, low work intension and reduced expenses.

Description

Technical field: [0001] The invention relates to the technical field of anti-scarring of distillation towers in the chemical industry, in particular to a method for preventing scarring of ammonia-alkali mother liquor distillation towers used in ammonia-soda method mother liquor distillation tower systems. Background technique [0002] Calcium sulfate scabbing in the mother liquor distillation tower is the most troublesome technical problem in the world's ammonia-soda alkali production industry. The sulfate radicals that enter the mother liquor with the raw salt are in the form of calcium sulfate in the distillation system (including pre-ash buckets, distillation towers and waste liquid pipelines). Crystals form rapidly and deposit on the channel. In order to reduce the speed of scarring, some manufacturers increase the volume of the pre-ash bucket to eliminate the supersaturation of calcium sulfate as much as possible, and some use high-vacuum distillation to reduce the temp...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01D7/18
Inventor 李建渊马德春冯树红陈春江李兴生王同国云玉娥李玉江刘伯轩
Owner TANGSHAN SANYOU CHEM IND
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