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Method for extracting m-phthalic acid-5-sodium sulfonate from trimonomer production wastewater

A technology for the production of isophthalic acid and wastewater, which is applied in chemical instruments and methods, organic chemistry, and the preparation of organic compounds, and can solve problems such as increasing the production cost of three monomers, refractory biodegradable wastewater, and endangering human health. To achieve the effect of changing the performance of extraction operation, reducing the amount of extracted water, and making it difficult to emulsify

Active Publication Date: 2014-10-08
WEIFANG WORLD CHEM
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AI Technical Summary

Problems solved by technology

[0003] At present, the domestic three-monomer industry mostly adopts the oleum sulfonation method for production, and the amount of waste liquid generated during the process is generally 4 tons of waste liquid / ton of three-monomer, and the waste liquid contains sodium sulfate and dimethyl isophthalate -5-sodium sulfonate, 5-sodium isophthalate, monomethyl isophthalate-5-sodium sulfonate, phenyl ring sulfone compounds, benzene ring-containing coke, benzene ring-containing polymer , methanol, dimethyl sulfate and other inorganic and organic compounds, a few of which are toxic and harmful substances, which are extremely difficult to biodegrade wastewater. If they are discharged directly without treatment, they will seriously pollute the environment and endanger human health.
Although some domestic enterprises have extracted methanol from three-monomer wastewater by rectification technology, the waste liquid dimethyl isophthalate-5-sodium sulfonate, isophthalic acid-5-sodium sulfonate, isophthalic acid Materials with important industrial value and application value such as monomethyl formate-5-sodium sulfonate have not been recovered, and the waste liquid at the bottom of the tower after recovering methanol is difficult to use the traditional flocculation method because of the high water solubility of the organic matter contained therein. At the same time, due to its high salinity characteristics, this type of wastewater must be diluted with a large amount of water before it can be biochemically treated, which makes this wastewater one of the most difficult chemical wastewater to treat.
Biochemical treatment is carried out after diluting with water, which wastes a lot of precious resources and directly increases the production cost of three monomers
At present, the treatment of such wastewater at home and abroad mainly adopts physical and biochemical combined treatment technologies such as adsorption, decolorization, and oxidation, and the treatment cost is very high.

Method used

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  • Method for extracting m-phthalic acid-5-sodium sulfonate from trimonomer production wastewater
  • Method for extracting m-phthalic acid-5-sodium sulfonate from trimonomer production wastewater
  • Method for extracting m-phthalic acid-5-sodium sulfonate from trimonomer production wastewater

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Experimental program
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Effect test

Embodiment 1

[0025] An analysis of the selection of the three monomers to extract the method of extracting the phenyl acid -5-sodium sodium sodium sodium sodium acid-5-sodium sulfonate:

[0026] Listing theory:

[0027] As an important separation method, extraction has high processing capacity, high separation efficiency, high recovery rate, wide application range, strong adaptability, good economy, and easy to achieve continuous operation and automatic control.For the occasion that is not suitable for separation and crystallization, there is a certain technical advantage in the extraction process: (1) The melting point or boiling point of each component is very close or forms a co -boiling material, which is difficult to or cannot be separated by the fine distillation method; (2 2) A small amount of high boiling point components, inorganic objects, and metal material recycling of the high boiling point of the volatile objects; (3) the thermal component, the funeral swimsuit causes decompositi...

Embodiment 2

[0060] A three-monomer production wastewater extract the method of sodium-5-sodium-5-sulfate, including the following steps: prepare extraction agents, pH value, extraction, anti-extraction, anti-extraction solution concentration, acidification, concentrated crystal, dryness, drynessEssence

[0061] 1. Prepare the extraction agent:

[0062] The quality ratio of each material in the extraction agent is performed according to the following three schemes:

[0063] Option One:

[0064] Weigh 700kg of triomamine, bisoprobinamine 2,4-two (N, N-two-based) amino duoline benzene 210kg, 2-Gee eleven alcohol 70kg, sulfide kerosene 420kg, Zhengxinol 280kg 280kg, Add the extraction kettle, stir for 40-60 minutes, and need to be used.

[0065] Option II:

[0066] Weigh 700kg of triomine, 2,4-two (n, n-dihal) amino duoline benzene 300kg of 2,4-two (N, N-two-based), 2-Gee elevenol 100kg, sulfide kerosene 585kg, orthopedic alcohol 325kg 325kg, Add the extraction kettle, stir for 40-60 minutes, and...

Embodiment 3

[0092] 1. Prepare the extraction agent

[0093] Weigh 700kg of triomine, 2,4-two (n, n-dihal) amino duoline benzene 300kg of 2,4-two (N, N-two-based), 325kg of orthopedly, 100kg of 2-Gee eleven alcohol, sulfide kerosene 585kg, Add the extraction kettle, stir for 40-60 minutes, and need to be used.

[0094] 2. Adjust the pH value

[0095] At 12.5m 3 In the pH adjustment kettle, measure the three monomer wastewater after the alcohol, add 10.5m 3 The concentration of 93%sulfuric acid is 200kg, and the pH value of the water phase is adjusted to 2.3.

[0096] 3. Extract

[0097] Add 2000kg to the wastewater with the pH value to the extraction kettle, turn on the stir, open the fixture steam valve, heat the material temperature in the kettle to 35 ° C within 20 minutes, and then continue to stir for 15 minutes.release.The organic phase is placed in the extraction kettle for use.

[0098] 4. Anti -extraction

[0099] Add the concentration of 14%NAOH solution 310kg to the extraction ket...

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Abstract

The invention discloses a method of extracting m-phthalic acid-5-sodium sulfonate from trimonomer production wastewater. The method sequentially comprises the following steps: preparing an extraction agent; adjusting the pH value; extracting; re-extracting; concentrating re-extracting liquid; acidifying; concentrating and crystallizing; and drying. In the extraction agent, double components (trioctylamine and ditertiary amine 2, 4-di(N, N-dihexyl) amino dodecylbenzene) are used as complexing agents, 2-heptyl undecyl alcohol is used as a cosolvent and double components (sulfonated kerosene and n-octyl alcohol) are used as diluents. According to the method provided by the invention, a complexing and extracting process is adopted for extracting m-phthalic acid-5-sodium sulfonate from liquid waste at the bottom of a tower after methanol is recovered from trimonomer and the best extraction system and reasonable extraction conditions are selected, so that the extraction rate of m-phthalic acid-5-sodium sulfonate is over 99%, the economic benefit of the trimonomer product is greatly improved, and comprehensive utilization of resources is realized.

Description

Technical field [0001] The present invention belongs to the field of comprehensive utilization of organic wastewater, and it is precisely the field of comprehensive utilization of wastewater production in three monomers. Background technique [0002] Three monomers (chemical name inter-phenyl-dihydronate-5-sodium sodium sulfate, English abbreviation SIPM) as an important modified agent for production modified polyester products (CDP / ECDP, etc.), in polyester sectionsThe cation -modified polyester filament produced after the introduction of SIPM. Although its appearance is not much different from the ordinary polyester filament, because the cedic modification is adopted, it not only greatly improves the color suction performance of the fiber, but also reduces the crystallization degree., To further adapt to the simulation of polyester fibers and improve the grade of the product.At present, the main production process of three -in -three monomers at home and abroad is: (1) S0 3 Sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C303/44C07C309/58
Inventor 郭学阳徐大鹏郭焕美杨荣华赵小云熊激光楚希玲
Owner WEIFANG WORLD CHEM
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