Treatment and resource-reclaiming process for waste water from production of dimethyl isophthalate-5-sulfonic acid

A technology of dimethyl isophthalate and production wastewater, which is applied in adsorption water/sewage treatment, ion-exchange water/sewage treatment and other directions, can solve problems such as unsolved problems in effective treatment of production wastewater, save raw materials and avoid waste water. Sub-pollution, significant environmental effects

Active Publication Date: 2006-09-27
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the salinity and CODcr of this type of wastewater are too high, the effective treatment of its production wastewater has not been solved so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: 100 mL of NDA-7 resin was loaded into a jacketed glass adsorption column (Φ30×250 mm). Take 200mL of light yellow wastewater for filtration pretreatment, the COD of wastewater Cr It is 180000mg / L, among which the COD of dimethyl isophthalate-5-sulfonic acid Cr It is 100000mg / L. The adsorption temperature is room temperature, and the waste water is first passed through the NDA-7 resin bed at a flow rate of 1BV / h, and the treatment capacity is 2000mL / batch. Adsorbed water is colorless, COD Cr down to 50000mg / L, and the content of dimethyl isophthalate-5-sulfonic acid dropped below 150mg / L. The adsorbed effluent is recovered by methanol distillation and detected by activated carbon adsorption. The effluent COD Cr Dropped to 100mg / L, dimethyl isophthalate-5-sulfonic acid was not detected.

[0015] The adsorbed NDA-7 resin was eluted and regenerated with 350mL of hot water, the temperature of the hot water was 80°C, and the flow rate of the hot water was 1BV / ...

Embodiment 2

[0016] Embodiment 2: The NDA-7 resin in embodiment 1 is replaced with Amberlite XAD-7 resin, Amberlite XAD-8 resin, Diaion HP2MG resin respectively, other operating conditions remain unchanged, and each batch capacity and effluent water quality are all obviously inferior In embodiment 1 processing effect.

Embodiment 3

[0017] Example 3: The adsorption temperature in Example 1 is controlled to 45±1° C. with a glass jacket, and other operating conditions remain unchanged, and the treatment capacity and effluent quality of each batch are obviously inferior to those of Example 1.

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PUM

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Abstract

The invention discloses a father and resource method about m-phthalic acid dimethyl ester-5-sulfonic acid produced waste-water.the steps is passing the m-phthalic acid dimethyl ester-5-sulfonic acid produced waste-water of filter preconditioning to adsorbing column loaded acrylate adsorbing resin; after adding alkali in adsorbing water for neutralization, distillation recovery by carbinol and adsorption handling by activated carbon, and then can be discharged; the acrylate adsorbing resin which is adsorbed the organic matter of m-phthalic acid dimethyl ester-5-sulfonic acid produced waste-water can be desorbed by hot water, the desorption liquid can recover the m-phthalic acid dimethyl ester-5-sulfonic acid crystal by evaporation, condensation and crystallization. The CODCr in disposal waste-water of the open method of this invention is fell from 180000mg / L to about 100mg / L, the m-phthalic acid dimethyl ester-5-sulfonic in waste-water can be recovered as product, the purity can reach to primary standard; not only saving the raw material, but also avoiding secondary pollution. The final discharged waste-water accord with national sewage discharge standard, hasing distinct environmental, economic and social benefit.

Description

1. Technical field [0001] The present invention relates to a treatment and recycling method of waste water from the production of dimethyl isophthalate-5-sulfonic acid. Production wastewater adsorption and desorption method. 2. Background technology [0002] The trade name of dimethyl isophthalate-5-sulfonic acid is SIPM. This product can be used as the third monomer in the production of cationic dyeable polyester by DMT method, commonly known as tri-monomer. The production of dimethyl isophthalate-5-sodium sulfonate generally adopts the "one-pot method", that is, after directly sulfonating isophthalic acid, esterification with methanol, and then reacting with alkali to obtain dimethyl isophthalate Sodium ester-5-sulfonate. Using this production process, about 7 tons of strong acid wastewater will be produced per ton of product. The wastewater is light yellow and has a CODcr of about 180,000 mg / L, mainly containing methanol (CODcr is about 80,000 mg / L) and dimethyl isopht...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/28
Inventor 李爱民杨维本孟冠华杨立成范军朱兆连葛俊杰张晓王津南张全兴
Owner NANJING UNIV
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