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Waste sulfuric acid recovery and concentration process

A technology of waste sulfuric acid and process, which is applied in the direction of sulfur trioxide/sulfuric acid, sulfur compounds, inorganic chemistry, etc., can solve the problems of inability to improve the purity of sulfuric acid, increase the purity of sulfuric acid, and high equipment consumption rate, so as to improve practicability and economy. The effect of reducing production cost and saving the use of sulfuric acid

Pending Publication Date: 2020-11-03
ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the waste liquid is directly used for heating and concentration, it can only achieve the effect of concentrating sulfuric acid, but cannot achieve the effect of increasing the purity of sulfuric acid
[0004] In summary, the existing problems in the prior art are that during the process of heating and concentrating sulfuric acid, the equipment consumption rate is relatively high, and the purity of sulfuric acid cannot be improved.

Method used

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  • Waste sulfuric acid recovery and concentration process

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 As shown, a waste sulfuric acid recovery and concentration process, the concentration method is based on a recovery and concentration device, the recovery and concentration device includes a filter kettle 1, an extraction kettle 2, a rectification I kettle 3, a rectification II kettle 4, and a vacuum evaporation kettle 5 and cation exchange resin column 6, rectification I kettle 3, rectification II kettle 4 and vacuum evaporation kettle 5 are all connected with double condenser 7;

[0028] The recovery and concentration process of waste sulfuric acid includes the following steps:

[0029] 1). Filtration: transfer the solution containing waste sulfuric acid into filter kettle 1 first, heat up to 80°C, add coconut shell activated carbon to the solution, control the mass percentage of coconut shell activated carbon to 15%, and use 800r / min Stir at a stirring rate of 40 minutes, and let stand at a constant temperature for 30 minutes. First, press filter wi...

Embodiment 2

[0038] The difference between this embodiment and embodiment 1 is:

[0039] A recovery and concentration process of waste sulfuric acid, the recovery and concentration process of waste sulfuric acid comprises the following steps:

[0040] 1). Filtration: transfer the solution containing waste sulfuric acid to filter kettle 1 first, heat up to 50°C, add coconut shell activated carbon to the solution, control the mass percentage of coconut shell activated carbon to 5%, and use 500r / min Stir at a stirring rate for 20 minutes, and let stand at a constant temperature for 10 minutes. First, filter with a microfiltration membrane, then filter with a nanofiltration membrane. Control the air pressure to 0.2Mpa, and collect the filtrate;

[0041] The membrane pore size of the microfiltration membrane is 500nm, and the membrane pore size of the nanofiltration membrane is 50nm;

[0042] 2). Extraction: Transfer the filtrate to the extraction kettle 2, cool down to 20°C, add the extractan...

Embodiment 3

[0049] The difference between this embodiment and embodiment 1, 2 is:

[0050] A recovery and concentration process of waste sulfuric acid, the recovery and concentration process of waste sulfuric acid comprises the following steps:

[0051] 1). Filtration: transfer the solution containing waste sulfuric acid to filter kettle 1 first, heat up to 80°C, add coconut shell activated carbon to the solution, control the mass percentage of coconut shell activated carbon to 5%, and use 800r / min Stir at a stirring rate for 20 minutes, and let stand at a constant temperature for 30 minutes. First, press filter with a microfiltration membrane, then filter with a nanofiltration membrane, control the air pressure to 0.2Mpa, and collect the filtrate;

[0052] The membrane pore size of the microfiltration membrane is 800nm, and the membrane pore size of the nanofiltration membrane is 50nm;

[0053] 2). Extraction: transfer the filtrate to the extraction kettle 2, cool down to 30°C, add the ...

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Abstract

The invention relates to a waste sulfuric acid recovery and concentration process, which is based on a recovery and concentration device, and comprises a filter kettle, an extraction kettle, a rectification kettle I, a rectification kettle II, a reduced pressure evaporation kettle, an ion exchange resin column and a double condenser. According to the process for recycling and concentrating the waste sulfuric acid, the waste sulfuric acid is firstly filtered by adopting a filter membrane, and then an organic phase in the waste sulfuric acid is extracted by adding an extracting agent to be recycled, so that the environment is prevented from being polluted by disordered emission, and the organic phase is rectified to recycle a solvent while the aqueous phase is rectified and concentrated, andthe aqueous phase is treated through a column to further recover the salt; according to the method, the wastewater is from the production of the p-nitrophenol, the treated wastewater can be reused for the production of the p-nitrophenol, the purity of the p-nitrophenol is not influenced, the use amount of the sulfuric acid can be reduced, the production cost is reduced, and the economic benefit of the whole process is further improved. Therefore, the method has a prospect and is valuable in recovering and concentrating the waste sulfuric acid and improving the practicability and the economy.

Description

technical field [0001] The invention relates to the technical field of waste acid concentration, and more precisely relates to a process for recovering and concentrating waste sulfuric acid. Background technique [0002] As a chemical product, sulfuric acid has been widely used in the production of many industries. For example, a large amount of dilute sulfuric acid will be produced in the production process of chemical industry and petroleum. In order to avoid the pollution of dilute sulfuric acid to the environment, lime or other alkaline solutions are generally used for neutralization, but this will not only cause consumption of lime or other alkaline solutions, but also cause waste of sulfuric acid resources. Concentration of waste sulfuric acid not only helps to reduce The consumption of lime and other materials, and the recycling and reuse of sulfuric acid can be achieved, which will help increase economic costs and build a resource-saving society. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88C01B17/90
CPCC01B17/88C01B17/905C01B17/90C01B17/904C01B17/901
Inventor 黄中桂袁晓林朱礼华陈军孔德明
Owner ANHUI DONGZHI GUANGXIN AGROCHEMICAL CO LTD
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