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Treatment method of wastewater of oxalic acid production

A technology for the production of wastewater and treatment methods, which is applied in natural water treatment, water/sludge/sewage treatment, ion-exchange water/sewage treatment, etc. It can solve the problems of high energy consumption, environmental pollution, and high cost, and achieve low energy consumption , less equipment investment, low cost effect

Active Publication Date: 2014-06-11
HUBEI YITAI PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods have the disadvantages of large energy consumption, high cost, and serious environmental pollution.

Method used

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  • Treatment method of wastewater of oxalic acid production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 360ml of oxalic acid production wastewater that has been preliminarily filtered in a 500ml beaker for use. Inject organic macroporous adsorption resin into the chromatography column (to prevent air bubbles), and install 3 columns in total, each column is filled with 60ml macroporous adsorption resin, and soaked in water. Then arrange them in order of height, and place the beaker containing oxalic acid production wastewater at the highest position, so that a potential difference is formed between them. Use a rubber tube to connect the oxalic acid production wastewater and the chromatographic column in series, and drive away part of the air. Start to open the valves of each chromatographic column from high to low in turn, the first thing to flow out is clean water, use the siphon to suck the oxalic acid production wastewater in the beaker into the chromatographic column, and the adsorption and removal of impurities begins.

[0031]Adjust the outlet valve of the chrom...

Embodiment 2

[0033] Add 300ml of oxalic acid production wastewater that has been preliminarily filtered in a 500ml beaker for use. Inject organic macroporous adsorption resin into the chromatographic column (to prevent air bubbles), a total of 3 columns are packed, each column is filled with 50ml macroporous adsorption resin, and soaked in water. Then arrange them in order of height, and place the beaker containing oxalic acid production wastewater at the highest position, so that a potential difference is formed between them. Use a rubber tube to connect the oxalic acid production wastewater and the chromatographic column in series, and drive away part of the air. Start to open the valves of each chromatographic column from high to low in turn, the first thing to flow out is clean water, use the siphon to suck the oxalic acid production wastewater in the beaker into the chromatographic column, and the adsorption and removal of impurities begins.

[0034] Adjust the chromatographic column...

Embodiment 3

[0036] Add 300ml of oxalic acid production wastewater that has been preliminarily filtered in a 500ml beaker for use. Inject organic macroporous adsorption resin into the chromatographic column (to prevent air bubbles), a total of 3 columns are packed, each column is filled with 50ml macroporous adsorption resin, and soaked in water. Then arrange them in order of height, and place the beaker containing oxalic acid production wastewater at the highest position, so that a potential difference is formed between them. Use a rubber tube to connect the oxalic acid production wastewater and the chromatographic column in series, and drive away part of the air. Start to open the valves of each chromatographic column from high to low in turn, the first thing to flow out is clean water, use the siphon to suck the oxalic acid production wastewater in the beaker into the chromatographic column, and the adsorption and removal of impurities begins.

[0037] Adjust the chromatographic column...

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Abstract

The invention discloses a treatment method of wastewater of oxalic acid production. The treatment method comprises the following step: step 1, carrying out centrifugal filtration on dark black wastewater of oxalic acid production to obtain centrifugal mother liquid; step 2, enabling the centrifugal mother liquid to pass through a tower column containing organic macroporous resin columns, and collecting light-blue column-passing liquid; and step 3, carrying out elution and reviving on the organic macroporous resin columns in the tower column by utilizing aqueous alkali. According to the treatment method, the wastewater of the oxalic acid production is repeatedly used after being decolored, decontaminated and recycled by utilizing novel organic macroporous resin; and the treatment method of the wastewater of the oxalic acid production has the advantage that the majority of the treated wastewater of the oxalic acid production can be recycled and circularly used. The treatment method is low in cost and energy consumption, is green and environment-friendly and basically realizes zero discharge of the wastewater of the oxalic acid production.

Description

【Technical field】 [0001] The invention belongs to the technical fields of chemical industry and environmental protection, and in particular relates to a treatment method for oxalic acid production wastewater. 【Background technique】 [0002] Oxalic acid, also known as oxalic acid, is the simplest dibasic acid in nature. It is an important chemical raw material widely used in the separation and purification of medicines, dyes, paints and rare earth metals and the bleaching of clothes. At present, the production process of domestic oxalic acid is mainly based on carbohydrate nitric acid oxidation method, in which starch or glucose is oxidized into oxalic acid with nitric acid. [0003] The oxalic acid mother liquor we often say is the mixed aqueous solution left after carbohydrates (mainly glucose and its leftovers) are oxidized into oxalic acid by nitric acid, the oxalic acid solution is cooled and crystallized, and the crude oxalic acid is separated by centrifugation. Its co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F103/36
Inventor 王正友陈进
Owner HUBEI YITAI PHARMA
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