Method for controlling and resource recovering waste water from production of phenylhydrazine

A technology for waste water production and resource recovery, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems that have not been reported in the literature, and achieve governance and resource utilization Effect

Inactive Publication Date: 2003-03-12
NANJING UNIV
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Problems solved by technology

[0004] Domestic and foreign document retrieval shows that the techno...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] Pack 20mL (about 15g) of NDA-150 resin into a glass column (Φ12×160mm) with an insulated jacket.

[0019] Take 200mL of orange-yellow phenylhydrazine sulfate (hereinafter referred to as thiohydrazine) production wastewater, CODcr is 25661mg / L, neutralize with milk of lime (17gCaO+80mL water-soluble and mix thoroughly), cool and filter. Add 0.5g (0.25%) stabilizer sodium sulfite to the filtrate to adjust the pH to 6.2-7.0, wherein the sulfur-containing hydrazine is about 7000mg / L, and the CODcr is 19848mg / L. And the flow rate of 100mL / h passes through the two-stage adsorption resin column, the adsorbed water is close to colorless, the content of thiohydrazine is reduced to 28mg / L, and the CODcr is reduced to 650mg / L. And then through biochemical treatment to achieve discharge standards.

[0020] The NDA-150 resin adsorbed with organic substances such as phenylhydrazine was sequentially desorbed and regenerated with 20mL of 10% hydrochloric acid, 20mL of 5% h...

Embodiment 2

[0022] Pack 100mL (about 75g) of NDA-99 resin into a glass column (Φ30×250mm) with an insulated jacket.

[0023] Get 1000mL orange-yellow thiohydrazine production wastewater, CODcr is 28880mg / L, neutralize with milk of lime (105gCa(OH) 2 + 200ml water to make slurry) to pH5.5~6.0, filter. Add 1.5g of stabilizer to the filtrate, and adjust the pH to 6.2-7.0 with a little liquid caustic soda as the upper column liquid. The upper column liquid contains about 7500mg / L of thiohydrazine and 24076mg / L of CODcr. At about 25°C, the upper column liquid is passed through the two-stage adsorption resin column at a flow rate of 100mL / h and 450mL / h in sequence, and the adsorbed water is nearly colorless, the content of thiohydrazine is reduced to 29.5mg / L, and the CODcr is reduced to 680mg / L. Discharge up to standard after biochemical treatment.

[0024] The adsorbed NDA-99 resin was sequentially desorbed and regenerated with 100mL of 10% hydrochloric acid, 100mL of 5% hydr...

Embodiment 3

[0026] Pack 100mL (about 75g) of NDA-99 resin into a glass column (Φ30×250mm) with an insulated jacket.

[0027] Take 600mL light yellow phenylhydrazine sulfate alkaline hydrolysis wastewater, CODcr is 23350mg / L, mix it with 400mL phenylhydrazine sulfate wastewater (CODcr is 28880mg / L), neutralize to pH=7.5~8.0, filter out a small amount of solid impurities, Add 1.0 g of a stabilizer to the filtrate as the upper column liquid. The upper column liquid contains about 4880mg / L of phenylhydrazine and 25400mg / L of CODcr. At about 25°C, the upper column liquid is passed through the two-stage adsorption resin column at a flow rate of 100mL / h and 500mL / h in turn, and the adsorbed water is nearly colorless, the content of phenylhydrazine is reduced to 24.6mg / L, and the CODcr is reduced to 540mg / L. Discharge up to standard after biochemical treatment.

[0028] The adsorbed NDA-99 resin column is sequentially desorbed and regenerated with 100mL 10% hydrochloric acid, 10...

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PUM

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Abstract

A process for reclaiming the sewage generated during preparing phenyl hydrazine includes pretreating, passing through adsorption column filled by macroporous adsorption resin with polystyrene structure, and biochemical treating. Its advantages are high treating effect, high recovery yield of phenylhydrazine hydrochloride, and generating calcium sulfate as by-product.

Description

1. Technical field [0001] The present invention relates to a treatment and resource recovery method for waste water produced in the production process of chemical intermediates, more specifically about the acidic waste water of phenylhydrazine sulfate (or phenylhydrazine hydrochloride) in the production process of fine chemical intermediate phenylhydrazine and alkaline hydrolysis wastewater treatment and resource recovery methods. 2. Background technology [0002] Phenylhydrazine is an intermediate of dyestuffs, medicines, and pesticides. It is used in the production of naphthol AS-G, antipyrine, etc., and is also a commonly used carbonylation reagent. Phenylhydrazine sulfate (or phenylhydrazine hydrochloride) is an intermediate product in the production of phenylhydrazine, and can also be used as a pharmaceutical and pesticide intermediate, such as for the production of benzoconazole. The traditional process of phenylhydrazine production is: using aniline as raw material, ...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/14
Inventor 陈金龙翟志才王海玲叶必华金小元费正皓李爱民魏瑞霞张全兴
Owner NANJING UNIV
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