Treatment and reclamation method of (methyl) acrylic acid production wastewater

A technology for the production of wastewater and acrylic acid, which is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, multi-stage treatment of water/sewage, etc. It can solve the problems of unsuitable biochemical treatment and unqualified discharge, and realize the realization of wastewater resources The effect of efficient utilization and simple process

Inactive Publication Date: 2013-11-27
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the treatment of this scheme, the wastewater still contains a relatively high concentration of formal

Method used

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  • Treatment and reclamation method of (methyl) acrylic acid production wastewater
  • Treatment and reclamation method of (methyl) acrylic acid production wastewater
  • Treatment and reclamation method of (methyl) acrylic acid production wastewater

Examples

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Embodiment 1

[0031] The wastewater used in this example is methacrylic acid wastewater, and its composition is shown in Table 1; the method of this example is as follows: Take 1 L of wastewater, heat it up to 90°C, stir it at a speed of 200r / min for 60min, continue to heat until boiling and evaporate, collect Condensate (I). When the Baume degree of the waste water reaches 14 degrees, dump the discharge liquid to obtain about 80g of a viscous solid-liquid mixture, add sodium hydroxide, stir and neutralize until the pH value is 8, form a uniform viscous body, and dry it at 105°C. That is, 67.5 g of boiler scale inhibitor mainly composed of (meth)acrylate mixed polymer was obtained. The obtained condensate (I) enters the oil-water separator (a pear-shaped separatory funnel is used here), and 1.4 mL of toluene is recovered; the water phase is neutralized with sodium hydroxide to a pH value of 8, and 36.8 g of sodium hydroxide is consumed. Concentrate by heating while collecting the condensat...

Embodiment 2

[0033] The wastewater used in this example is methacrylic acid wastewater, and its composition is shown in Table 1; the method of this example is as follows: Take 1 L of wastewater, heat it up to 90°C, stir at 300r / min for 30min, continue heating until boiling and evaporate, collect Condensate (I). When the Baume degree of the wastewater reaches 15 degrees, pour out the liquid to obtain about 75mL viscous solid-liquid mixture, add sodium hydroxide, stir and neutralize until the pH value is 8, and form a viscous viscous body, bake at 105 ° C After drying, 66.1 g of a boiler scale inhibitor mainly composed of (meth)acrylate mixed polymers was obtained. The obtained condensate (I) enters the oil-water separator (a pear-shaped separatory funnel is used here), and 1.6 mL of toluene is recovered; the water phase is neutralized with sodium hydroxide to a pH value of 8, and 39.5 g of sodium hydroxide is consumed. Concentrate by heating while collecting the condensate (II). When the ...

Embodiment 3

[0035] The wastewater used in this example is acrylic acid wastewater, and its composition is shown in Table 1; the method of this example is as follows: take 1 L of wastewater, heat it up to 90°C, stir it at a speed of 200r / min for 60min, continue heating until it boils and evaporate, and collect the condensate (I). When the Baume degree of the wastewater reaches 14 degrees, pour out the liquid, about 45mL, add sodium hydroxide, stir and neutralize until the pH value is 8, a black viscous body is formed, and dry at 105°C to obtain (methyl) 36.6g of boiler scale inhibitor mainly composed of acrylate mixed polymer. The obtained condensate (I) enters the oil-water separator (a pear-shaped separatory funnel is used here), and 0.3 mL of toluene is recovered; the water phase is neutralized with sodium hydroxide to a pH value of 8, and 23.1 g of sodium hydroxide is consumed. Concentrate by heating while collecting the condensate (II). When the Baume degree of the feed liquid reach...

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Abstract

The invention relates to a treatment and reclamation method of (methyl) acrylic acid production wastewater. The method solves the treatment problem of (methyl) acrylic acid wastewater, and simultaneously recovers sodium acetate, a boiler scale inhibitor and methylurea. The method includes: conducting stirring and heating to make acrylic acid, methylacrylic acid and other organic matters in the wastewater polymerize so as to prepare a polymer of the boiler scale inhibitor; performing heating to evaporate wastewater, and evaporating the acetic acid, toluene and unpolymerized aldehyde in the wastewater by carrying azeotropism, conducting oil-water separation, and recovering toluene; neutralizing acetic acid with alkali, carrying out concentration crystallization, and recovering sodium acetate crystals; then conducting acid catalysis, utilizing excess urea precipitate to remove the formaldehyde carried out by evaporation, recovering methylurea, at the same time improving the biodegradability of the wastewater, adjusting the pH value by a limestone filter bed, reducing the COD value to less than 1000mg/L, enhancing the biodegradability, and discharging the wastewater into a domestic sewage treatment plant to undergo treatment. The method has a simple process, can recover useful substances while treating wastewater, realizes resource utilization of wastewater, and has significant environmental, economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment and recycling method for (meth)acrylic acid production waste water. Background technique [0002] Both methacrylic acid and acrylic acid are important chemical raw materials. A large amount of wastewater will be generated during the production process. The wastewater contains a large amount of acetic acid, methacrylic acid, acrylic acid, aldehydes and toluene and other organic substances. The chemical oxygen demand (CODcr) is as high as Tens of thousands to hundreds of thousands of mg / L belong to high-concentration organic wastewater. [0003] At present, the treatment methods for high-concentration organic wastewater such as (meth)acrylic acid production wastewater mainly include incineration, biochemical and catalytic wet oxidation (Zhang Yongwei, "Industrial Water Treatment", 2012, Volume 32, Issue 4: p17-20) . Among these methods, the incineration...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07C53/10C07C51/41C07C51/43C07C273/18C07C275/06
Inventor 张东方得安王震宇宋恩军任广军范春健
Owner SHENYANG LIGONG UNIV
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