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Process for reclaiming o-chlorobenzaldehyde from mother liquor or waste water

A technology of o-chlorobenzaldehyde and process is applied in the field of recovery of o-chlorobenzaldehyde, which can solve the problems of increasing waste water treatment load and wasting resources, and achieve the effects of reducing treatment load, reducing COD, and the method being simple and feasible.

Inactive Publication Date: 2009-09-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] O-chlorobenzaldehyde production mother liquor and washing wastewater contain about 0.44-0.5% o-chlorobenzaldehyde. This kind of production mother liquor is sent to wastewater treatment, which wastes resources and increases the load of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Get o-chlorobenzaldehyde synthetic mother liquor 500ml, o-chlorobenzaldehyde concentration is 4800mg / l, add sulfuric acid to mother liquor pH=2; Get strongly polar macroporous adsorption resin (with the NKA-2 type that Tianjin Nankai chemical factory produces as example, NKA-2 is a styrene-diethylbenzene structure) 10ml column, the pretreatment is as follows: successively treat with 4% hydrochloric acid, acetone, 4% sodium hydroxide solution and wash with water until neutral.

[0012] Adsorption: The temperature is 5°C, the flow rate is 2BV / h, the concentration of o-chlorobenzaldehyde in the adsorbed water is 185mg / l, and the recovery rate is 96.1%. After the adsorption is saturated, use methanol as the eluent at a temperature of 25°C and a flow rate of 1BV / h to desorb to obtain a methanol solution of o-chlorobenzaldehyde. The o-chlorobenzaldehyde and methanol are recovered by distillation with a desorption rate of 99.4%.

Embodiment 2

[0014] Take 500ml of o-chlorobenzaldehyde synthesis mother liquor, the concentration of o-chlorobenzaldehyde is 4800mg / l, pH=6.4.

[0015] Get highly polar macroporous adsorption resin (the NKA-2 type produced by Tianjin Nankai Chemical Factory as an example, NKA-2 is styrene-diethylbenzene structure) 10ml packing column, pretreatment is as follows: successively with 4% hydrochloric acid, Acetone, 4% sodium hydroxide solution and washed to neutral.

[0016] Adsorption: The adsorption temperature is 25°C, the flow rate is 8BV / h, the concentration of o-chlorobenzaldehyde in the adsorbed water is 198mg / l, and the recovery rate is 95.9%. After the adsorption is saturated, use acetone as the eluent at a temperature of 50°C and a flow rate of 2BV / h to desorb to obtain a solution of o-chlorobenzaldehyde in acetone. The o-chlorobenzaldehyde and acetone are recovered by distillation with a desorption rate of 99.4%.

Embodiment 3

[0018] Take 500ml of o-chlorobenzaldehyde synthesis mother liquor, the concentration of o-chlorobenzaldehyde is 4800mg / l, pH=2.2. Take 10 ml of non-polar macroporous adsorption resin (Tianjin Nankai Chemical Plant H103 as an example) and pack it into a column, and the pretreatment method is the same as before; when adsorbing, the temperature is 40 ° C, the flow rate is 16 BV / h, and o-chlorobenzaldehyde is adsorbed in the water The concentration was 226 mg / l, and the recovery rate was 95.3%. After the adsorption is saturated, use industrial acetone as the eluent at a temperature of 50°C and a flow rate of 4BV / h to desorb to obtain o-chlorobenzaldehyde acetone solution, and distill and separate to obtain o-chlorobenzaldehyde and acetone with a desorption rate of 99.0%.

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Abstract

The invention discloses a process for reclaiming o-chlorobenzaldehyde from production mother liquor or waste water, which comprises the following steps that: firstly, macroporous absorbent resin is loaded into an adsorption column, after conventional pretreatment, synthetic mother liquor of o-chlorobenzaldehyde or waste water containing o-chlorobenzaldehyde flows through the resin of the adsorption column at a temperature of between 5 and 40 DEG C and at a flow rate of between 2 and 16 BV / h, and the o-chlorobenzaldehyde is adsorbed; and secondly, after the resin is adsorbed to saturation, an organic solution of methanol, acetone or aether, and the like is used as eluate for desorption at a temperature of between 25 and 50 DEG C and the flow rate of between 1 and 4 BV / h, and the desorption solution is distilled and separated to obtain the o-chlorobenzaldehyde and the organic solvent. The method is simple and feasible, the recovery rate of the o-chlorobenzaldehyde reaches 95 to 96 percent, and the method simultaneously reduces COD of the mother liquor or the waste water and lightens the treatment burden of the waste water.

Description

technical field [0001] The invention relates to the recovery of o-chlorobenzaldehyde, specifically, a method for recovering o-chlorobenzaldehyde from production mother liquor or waste water with a macroporous adsorption resin. Background technique [0002] O-chlorobenzaldehyde production mother liquor and washing wastewater contain about 0.44-0.5% o-chlorobenzaldehyde. This kind of production mother liquor is sent to wastewater treatment, which not only wastes resources but also increases the load of wastewater treatment. Contents of the invention [0003] The object of the present invention is achieved by the following process: [0004] A kind of technique that reclaims o-chlorobenzaldehyde from production mother liquor or waste liquor, it is made up of following steps: [0005] Step A: Load macroporous adsorption resin into the adsorption column, and after conventional pretreatment, synthesize o-chlorobenzaldehyde into mother liquor or wastewater containing o-chlorobenz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/55C07C45/79C07C45/82
Inventor 赵玉明安浩代允
Owner NANJING UNIV
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