A method for separating spent acid using three-zone sequential simulated moving bed continuous chromatography

A technology of simulating moving bed and continuous chromatography, applied in the field of wastewater treatment and biological separation, can solve the problems of large water consumption, low salt removal rate, low separation degree, etc. Effect

Active Publication Date: 2022-02-18
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existing equipment for waste acid treatment has a relatively complex structure, and the resin in each cycle is eluted by water before it is completely saturated. The amount of product in a single cycle is small, the water consumption is large, and the removal rate of salt is low. Water swelling issues, slightly dilute acid concentration, and low resolution between acid and salt

Method used

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  • A method for separating spent acid using three-zone sequential simulated moving bed continuous chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The three-zone SSMB continuous process unit separation system is adopted. Each resin column was filled with 0.6L resin (Tulsimer ), resin column diameter 5cm, height 40cm. The pretreated waste acid stock solution was loaded on the column, and deionized water was used as the eluent.

[0046] (1) The waste acid stock solution is injected at the inlet of the first column, the injection rate is 0.5BV / h, and the feed is 1BV. At the same time, the weakly retained component (ferrous sulfate) is collected at the first outlet of the first column until the effluent When the concentration of ferrous salt in the middle is 10% to 15% of the concentration of ferrous salt in the original ferrous salt-containing waste acid solution, stop collecting to obtain the effluent containing ferrous salt;

[0047] (2) At the end of step (1), continue to enter the eluting water at the inlet of the first column, the flow rate of the eluting water is 0.8BV / h, the consumption of eluting water is ...

Embodiment 2

[0050] Example 2: Continuous chromatographic separation of waste acid stock solution.

[0051] The three-zone SSMB continuous process unit separation system is adopted. Each resin column was filled with 0.6L resin (Tulsimer ), resin column diameter 5cm, height 40cm. The pretreated waste acid stock solution was loaded on the column, and deionized water was used as the eluent.

[0052] (1) The waste acid stock solution is injected at the inlet of the first column, the injection rate is 1BV / h, and the feed is 1BV. At the same time, the weakly retained component (ferrous sulfate) is collected at the first outlet of the first column until it is in the effluent When the concentration of ferrous salt is 10% to 15% of the concentration of ferrous salt in the original ferrous salt-containing waste acid solution, stop collecting to obtain the effluent containing ferrous salt;

[0053] (2) At the end of step (1), continue to enter the eluate at the inlet of the first column, the flow...

Embodiment 3

[0056] Example 3: Continuous chromatographic separation of waste acid stock solution.

[0057] The three-zone SSMB continuous process unit separation system is adopted. Each resin column was filled with 0.6L resin (Tulsimer ), resin column diameter 5cm, height 40cm. The pretreated waste acid stock solution was loaded on the column, and deionized water was used as the eluent.

[0058] (1) The waste acid stock solution is injected at the inlet of the first column, the injection rate is 1.5BV / h, and the feed is 1BV. At the same time, the weakly retained component (ferrous sulfate) is collected at the first outlet of the first column until the effluent When the concentration of ferrous salt in the middle is 10% to 15% of the concentration of ferrous salt in the original ferrous salt-containing waste acid solution, stop collecting to obtain the effluent containing ferrous salt;

[0059] (2) At the end of step (1), continue to enter the eluate at the inlet of the first column, t...

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Abstract

The invention discloses a method for separating waste acid using a three-zone sequential simulated moving bed continuous chromatographic technique, which comprises the following steps: (1) loading the waste acid liquid containing ferrous salt into the first column, from the first column The outlet of the outlet collects the effluent, and stops collecting when the concentration of ferrous salt in the effluent is 10% to 15% of the concentration of ferrous salt in the waste acid solution containing ferrous salt, so as to obtain the effluent containing ferrous salt; 2) The desorbent flows in from the upper end of the first column, and the remaining waste acid solution in the first column is loaded into the second column, and the effluent is collected from the outlet of the third column. When the concentration of sulfuric acid in the effluent is the original content When the concentration of sulfuric acid in the ferrous salt waste acid solution is 25%~30%, stop collecting to obtain the first effluent containing sulfuric acid; (3) the remaining waste acid solution is internally circulated until the first column and the second column All the acid in the column is blocked into the third column; (4) the desorbent flows in from the upper end of the third column to obtain the second effluent containing sulfuric acid.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment and biological separation, and in particular relates to a method for separating waste acid by using a three-zone sequential simulated moving bed continuous chromatography technology. Background technique [0002] Metallurgical enterprises often use a large amount of concentrated acid to clean raw materials or equipment. The waste acid after use has a high concentration, but it contains a large amount of impurities, so it cannot be reused and can only be treated as waste liquid. If it is directly imported into the wastewater treatment system , it will cause a large amount of salt in the wastewater, which will affect biochemistry, and the operating cost is high. If these waste acids can be effectively recycled and reused to produce useful chemical products, it will not only reduce environmental pollution, but also reduce the waste of resources. Therefore, It is necessary to recycle was...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90C01G49/14
CPCC01B17/904C01G49/14
Inventor 应汉杰张竞吴菁岚
Owner NANJING TECH UNIV
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