Treatment method for paraformaldehyde wastewater

A paraformaldehyde and treatment method technology, which is applied in the field of paraformaldehyde wastewater treatment, can solve the problems of serious secondary pollution, high treatment cost, and low operating cost, and achieve the effects of less loss, high activity, and convenient operation

Active Publication Date: 2016-08-03
福华通达化学股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of serious secondary pollution, high treatment cost and low efficiency in the treatment of formaldehyde wastewater in the prior art, and proposes a new treatment method for paraformaldehyde wastewater by using a granular catalyst loaded with precious metal ions Convert organic waste in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A treatment method for paraformaldehyde waste water, comprising the following steps

[0035] A. Vector preparation

[0036] After mixing 70 parts of titanium oxide, 5 parts of graphite, 5 parts of glass fiber and 1 part of kale powder, add 30 parts of acetic acid solution with a mass concentration of 7%, mix again, extrude and granulate to make semi-finished granules , the size of the obtained particles is Φ4mm, and the length is 5mm; after drying and roasting the semi-finished particles, the catalyst carrier is obtained. After testing, its specific surface area is 28m 2 / g, the average strength is 263N / cm;

[0037] B. Catalyst Preparation

[0038] Adding ruthenium chloride with a mass concentration of 1% hydrochloric acid to prepare an impregnating solution, the mass ratio of the hydrochloric acid to ruthenium is 20:1, impregnating the catalyst carrier with the impregnating solution, the mass of the catalyst carrier and the impregnating solution The ratio is 5:1 to ...

Embodiment 2

[0044] A treatment method for paraformaldehyde waste water, comprising the following steps

[0045] A. Vector preparation

[0046] After mixing 90 parts of activated carbon powder, 5 parts of glass fiber and 2 parts of methylcellulose evenly, add 50 parts of sulfuric acid solution with a mass concentration of 8%, and after mixing evenly again, extrude and granulate to make semi-finished granules, the obtained granules The specification is Φ4mm and the length is 5mm; after drying and roasting the semi-finished particles, the catalyst carrier is obtained. After testing, its specific surface area is 360m 2 / g, the average strength is 166N / cm;

[0047] B. Catalyst Preparation

[0048] Ruthenium chloride and palladium chloride plus hydrochloric acid with a mass concentration of 10% are prepared as an impregnation solution, the mass ratio of ruthenium and palladium is 1:1, and the total mass ratio of the hydrochloric acid to the noble metal is 50:1, and the impregnation solution i...

Embodiment 3

[0054] A treatment method for paraformaldehyde waste water, comprising the following steps

[0055] A. Vector Preparation

[0056] After mixing 95 parts of titanium oxide, 5 parts of silicon dioxide, 2 parts of clay and 8 parts of glycerin, add 35 parts of acetic acid solution with a mass concentration of 10%, mix again, extrude and granulate to make a semi-finished product Particles, the size of the obtained particles is Φ4mm, and the length is 5mm; after drying and roasting the semi-finished particles, the catalyst carrier is obtained. After testing, its specific surface area is 30m 2 / g, the average strength is 126N / cm;

[0057] B. Catalyst Preparation

[0058] The hydrochloric acid that palladium chloride is added and mass concentration is 5% is mixed with dipping liquid, and the mass ratio of described hydrochloric acid and palladium is 33:1, impregnates described catalyst carrier with described dipping liquid, the mass of described catalyst carrier and dipping liquid ...

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Abstract

The invention discloses a treatment method for paraformaldehyde wastewater, and belongs to the technical field of sewage treatment and environment protection .The method comprises the three steps of A, carrier preparation; B, catalyst preparation; C, wastewater treatment .The activity of a catalyst is high, losses are small after the catalyst is used, the using time is long, and the problems that secondary pollution is caused by transition metal salt adopted in the prior art and a static bed is blocked due to the adoption of a powdery carrier are solved .In addition, a trickle bed is adopted for catalytic oxidation for treatment, operation is convenient, air is adopted as an oxidizing agent in the oxidation treatment process, the cost is low, the efficiency is high, and the method is particularly suitable for industrial continuous treatment; the method is used for treating wastewater produced by production of paraformaldehyde, the COD removal rate can reach 95% or above, the ammonia nitrogen content is lower than 30 mg/L, and the formaldehyde content is lower than 10 mg/L.

Description

technical field [0001] The invention relates to a treatment method for paraformaldehyde wastewater, which belongs to the technical field of sewage treatment and environmental protection. Background technique [0002] Paraformaldehyde was developed by American DuPont Company in 1956. It has a wide range of uses and is widely used in the synthesis of pesticides, synthetic resins, paints and fumigants. The industrial synthesis method mostly uses methanol as raw material, and it is prepared by oxidation and catalytic polymerization, and the remaining low-concentration formaldehyde solution is used to prepare urotropine. Therefore, the wastewater produced by paraformaldehyde production contains a large amount of formaldehyde, paraformaldehyde, paraformaldehyde (TOX), dioxane (BOX), methanol, ammonia nitrogen, urotropine and other pollutants. Due to the high concentration of formaldehyde and COD in wastewater, biological treatment cannot be directly used, so pretreatment is requi...

Claims

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Application Information

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IPC IPC(8): C02F1/72B01J23/46B01J23/44B01J23/63C02F101/34
Inventor 宋云钊王文吴狄峰李丹丹刘修兵张强王蕾张华
Owner 福华通达化学股份公司
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