Reclaiming technique by using resin to adsorb nitro chlorobenzene in wastewater from producing nitro chlorobenzene

A technology for nitrochlorobenzene and waste water production, which is used in adsorption water/sewage treatment, solid adsorbent liquid separation, water/sewage treatment, etc., and can solve the problem of large equipment investment, high recovery cost of nitrochlorobenzene, and high energy consumption question

Inactive Publication Date: 2005-01-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the generation of other by-products in the production of nitrochlorobenzene, the chlorobenzene extract also contains nitrophenol impurities in addition to nitrochlorobenzene, so the chlorobenzene extract returns to production as a raw material and affects product quality.
The steam azeotropic distillation method can recover nitrochlorobenzene with higher purity, but there are disadvantages such as large equipment investment, high energy consumption, unstable operation, etc., thus increasing the recovery cost of nitrochlorobenzene, and the method nitrochlorobenzene The recovery rate is low, and the content of nitrochlorobenzene in the treated wastewater is generally 300-400mg / L

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Pack 20mL (about 13g) of NDA-16 resin (produced by Jiangsu Nanda God Environmental Protection Technology Co., Ltd., the same below) into an adsorption column (φ20×250mm).

[0018] Get 4L of nitrochlorobenzene production waste water to filter with filter paper, the content of the o- and p-nitrochlorobenzene of this waste water is 1056mg / L. Pass through the resin column at a flow rate of 200mL / h at normal temperature, and the content of nitrochlorobenzene adsorbed out of water drops to 1.4mg / L. The adsorbed resin was desorbed and regenerated with water vapor at 115°C, and the desorbed liquid was cooled and separated to recover 4.18g of a mixture of o- and p-nitrochlorobenzene.

Embodiment 2

[0020] Pack 200mL (about 130g) of NDA-16 resin into an adsorption column (φ35×500mm).

[0021] Get 34L nitrochlorobenzene production waste water to filter with sand filter, the content of the o- and p-nitrochlorobenzene of this waste water is 1128mg / L. Pass through the resin column at a flow rate of 1.6L / h at normal temperature, and the content of nitrochlorobenzene adsorbed out of water drops to 1.8mg / L. The adsorbed resin was desorbed and regenerated with water vapor at 115°C, and the desorbed liquid was cooled and separated to recover 38.1 g of a mixture of o- and p-nitrochlorobenzene.

Embodiment 3

[0023] Step is with embodiment 2, and adsorption flow rate is changed into 1.0L / h, and its result is basically identical with embodiment 2.

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PUM

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Abstract

The method is to to get rid of mechanical impurity in prodn, waste water of nitrochlorobenzene by pretreatment, then to make it passing through adsorption column filled by styrene-divinylbenzene absorbing resin in flow quantity less than 10 BV / h, the nitrochlorobenzene is selected absorbed on the resin, nitroxylene is not absorbed, quantity of absorbed nitrochlorobenzene is less than 2 mg / L, the resin absorbing nitrochlorobenzene is deadsorbed and regenerated by using water vapour as deadsorpting agent, the generated gas-liquid mixture is cooled and separate to recover nitrochlorobenzene. More than 99 percent of o-nitrochlorobenzene and para-nitrochlorobenzene can be recovered from waste water by this invention. The recovered matter can be send back to recti-ficating production process to be rectificated separated to obtain o-nitrochlorobenzene and para-nitrochlorobenzene products.

Description

technical field [0001] The invention relates to a method for recovering useful substances in nitrochlorobenzene production wastewater, in particular to a treatment process for selectively absorbing and recovering o- and para-position nitrochlorobenzene in nitrochlorobenzene production wastewater by using an adsorption resin. Background technique [0002] Nitrochlorobenzene (including p-nitrochlorobenzene and o-nitrochlorobenzene) is an important chemical raw material, widely used in pesticides, dyes and other industries. The production of nitrochlorobenzene is based on chlorobenzene, and the mixed acid of nitric acid and sulfuric acid is used as the nitrating agent for nitration. The crude product obtained by nitration needs to be washed with water and alkaline, and then fractionated with a rectification tower to obtain p-nitrochlorobenzene. Chlorobenzene and o-nitrochlorobenzene. [0003] Using the above-mentioned production process, about 1.2 tons of alkaline wastewater w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/04C02F1/28C02F1/58
Inventor 龙超李爱民高冠道费正皓张全兴陈金龙
Owner NANJING UNIV
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