Scrubbed waste water treating and resource recovering process during the production of chlorobenzene

A production process and resource recovery technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as high operating costs, large investment, and poor treatment effects. Achieve the effect of recycling resources and achieving zero emissions

Inactive Publication Date: 2002-05-08
NANJING UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

These methods either have poor treatment effects, or require large investment and high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The treatment and resource recovery method of washing wastewater in the production process of chlorinated benzene, the steps are:

[0016] (a) Put 100ml (about 73 grams) of D296 type iron removal resin (produced by Jinxiang Chemical Factory, Danyang City, Jiangsu Province) into a glass column (Φ30mm×250mm) with a heating jacket.

[0017] (b) The acid wastewater discharged from the chlorinated benzene production workshop is brownish yellow and turbid. After filtering, the filtrate is brownish yellow transparent liquid, the concentration of hydrochloric acid is 3.18mol / L, Fe 3+ The content of benzene is 7651mg / L, the content of benzene is 730mg / L, and the content of chlorinated benzene is 150mg / L. The waste water is filled with hydrogen chloride gas in the enriched absorption tower to make the acidity reach the HCl content of 9.0mol / L or above. When hydrogen chloride is introduced, the benzene and chlorinated benzene in the waste water are distilled out and condensed to o...

Embodiment 2

[0020] The device and early stage operation are the same as in Example 1, but adopt the upward flow operation mode to remove iron, and the upper column liquid Fe 3+ The content of the hydrochloric acid is 7548mg / L, the concentration of hydrochloric acid is 8.85mol / L, under the conditions of the working flow rate of 200ml / h and the operating temperature of 35°C, the processing capacity is 750ml / batch, and the effluent Fe 3+ The average concentration is 9.4mg / L, which can be used as industrial hydrochloric acid. Use 120ml distilled water as the resin regeneration agent, flow down into the resin column, the operating temperature is normal temperature (about 28°C), the working flow rate is 20ml / h, Fe 3+ The elution rate was 99.0%. The 100ml elution regeneration solution that just flows out is dark brown red, and it is a high-concentration elution regeneration solution, containing 16.9 grams of ferric chloride, which can be used as a water purifier. The 20ml eluent regeneration s...

Embodiment 3

[0022] a. Choose three jacketed fixed bed resin iron removal towers, each tower has an inner diameter of 600mm and a tower height of 5500mm, and each tower is filled with 800kg (about 1100L) of D296 resin. The hydrochloric acid concentration is 2.5~3.5mol / L, Fe 3+ Concentration is 2000~4000mg / L, benzene and chlorinated benzene content are respectively 500~1000mg / L and 100~200mg / L chlorinated benzene washing waste water, carry out preliminary operation as embodiment 1, then filter and absorb After the tower, the concentration of hydrochloric acid is 10.4mol / L, and the chlorinated benzene washing wastewater with a temperature of less than 40°C is poured into the resin iron removal tower. The iron removal tower adopts the method of iron removal by double towers I and II in series, and the treatment flow rate is 2.0m 3 / h, the processing capacity of each batch is 40m 3 . After the wastewater is treated, the effluent is light yellow transparent liquid, Fe 3+ The average concentr...

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Abstract

The scrubbed waste water treating and resource recovering process includes introducing HCl to waste water while distilling off benzene and chlorobenzene; eliminating iron through passing through strong alkali anionic exchange resin to obtain hydrochloric acid effluent; eluting iron complex anion in the strong alkali anionic exchange resin with distilled water as regenerant to obtain eluting liquid, which is high concentration iron trichloride solution capable of being used as water purifier, while regenerating the resin. When the process is used in treating waste water containing Fe ion 2000-8000 mg/L, hydrochloric acid 2.5-4.0 mol/L, benzene 500-1000 mg/L and chlorobenzene 100-200 mg/L, Fe ion over 99 % and benzene and chlorobenzene over 95% may be eliminated while the resource being recovered.

Description

1. Technical field [0001] The invention relates to the treatment of washing wastewater in the production process of dye and pesticide intermediate chlorinated benzene. Specifically, it refers to the separation, recovery and comprehensive utilization of hydrochloric acid, ferric chloride, benzene and chlorinated benzene in the washing wastewater in the production process of chlorinated benzene. 2. Background technology [0002] Chlorinated benzene is an important intermediate in the production of dyes and pesticides. The common production method of chlorinated benzene is the direct chlorination method, that is, the direct reaction of benzene and chlorine gas under the catalysis of ferric chloride produces chlorinated benzene. During the production of chlorinated benzene, highly acidic brown-yellow washing wastewater is produced, and the wastewater volume is 0.2-0.4m 3 / ton of product. The concentration of hydrochloric acid in wastewater is 2.5-4.0mol / L, Fe 3+ The content...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/10
Inventor 张全兴陈金龙王勇张慧春梅翔张虹袁维国芦凤林吴春华金立学达庆李汉雄
Owner NANJING UNIV
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