A comprehensive treatment method for acrylate production wastewater

A technology for acrylate and waste water production, which is applied in natural water treatment, water/sewage treatment, multi-stage water/sewage treatment, etc. It can solve the problems of wide molecular weight distribution, large dispersion, and poor effect, and achieve uniformity improvement, Good stability, reduce the effect of processing flow

Active Publication Date: 2020-11-10
JIANGSU RUIYANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the existing defects in the treatment of acrylate production wastewater in the prior art, further solve the molecular weight distribution of the sodium polyacrylate obtained in the production of low-molecular-weight sodium polyacrylate in CN101786742A, which has a wide molecular weight distribution, large dispersion, inhomogeneity, and low purity. In the case of scale inhibitors, the effect is poor and other defects, the invention provides a comprehensive treatment method for acrylate production wastewater

Method used

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  • A comprehensive treatment method for acrylate production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 600g of acrylate production wastewater with a solid content of 15.5% (in which sodium acrylate accounts for about 12-13%), adjust the pH to 6 with sodium hydroxide, add 60g of chain transfer agent isopropanol to the mixed wastewater, and stir at room temperature After dissolving, add initiator benzoyl peroxide 6g, sodium bisulfite 12g, heat up to 80°C; keep warm for 4 hours to carry out polymerization reaction, after the reaction waste water is cooled to room temperature, then pass through nanofiltration and ultrafiltration membrane separation module Separating water and small molecular salts to obtain poly(meth)acrylate sodium aqueous solution, solid night separation; the molecular weight of the produced sodium polyacrylate is 4600, the dispersion Mw / Mn=1.25, and the purity is greater than 90%; after separation, it contains a small amount of Other waste water of sodium acrylate is heated and concentrated, fractionated isopropanol is cooled and reused during concent...

Embodiment 2

[0041] Take 600g of acrylate production wastewater with a solid content of 15.5% (wherein sodium acrylate accounts for about 12 to 13%), adjust the pH to 8 with sodium hydroxide, add 10g of chain transfer agent dodecanethiol to the mixed wastewater, and After stirring and dissolving, add initiator cumene hydroperoxide 6g, potassium bisulfite 12g, heat up to 50°C; keep warm for 9 hours to carry out polymerization reaction, after the reaction wastewater is cooled to room temperature, pass through nanofiltration and ultrafiltration membranes in turn The separation component separates water and small molecular salts to obtain an aqueous solution of sodium poly(meth)acrylate, which is separated overnight; the molecular weight of the produced sodium polyacrylate is 5510, the dispersion Mw / Mn=1.30, and the purity is greater than 90%. After separation, other wastewater containing a small amount of sodium acrylate is heated and concentrated, heavy components are incinerated, and light c...

Embodiment 3

[0043] Take 600g of acrylate production wastewater with a solid content of 15.5% (wherein sodium acrylate accounts for about 12-13%), adjust the pH to 6 with sodium carbonate, add 20g of chain transfer agent sodium phosphate to the mixed wastewater, stir and dissolve at room temperature Finally, add initiator sodium persulfate 6g, sodium bisulfite 6g, hydrogen peroxide 12g, heat up to 80°C; keep warm for 8 hours to carry out polymerization reaction, after the waste water after the reaction is cooled to room temperature, concentrate the solution under reduced pressure to 210ml about 1 / 3 volume, fractionated butanol is cooled and recycled during concentration, 100g ethanol is added, stirred for 0.5h, after standing for 15min, poly(meth)acrylate sodium filter cake is obtained after pressure filtration, and the molecular weight of filter cake gained sodium polyacrylate is in 3860, dispersion Mw / Mn=1.17, purity greater than 90%; fractionate the filtrate obtained by pressure filtrat...

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Abstract

The invention discloses a comprehensive treatment method for acrylic ester production wastewater. The comprehensive treatment method comprises the following steps that A, other wastewater in the acrylic ester production process except catalyst washing wastewater is mixed to obtain mixed wastewater; B, the pH of the mixed wastewater obtained in the step A is regulated to 6-8, then a chain transfer agent is added, an initiator is added after stirring dissolution at the temperature of 20-40 DEG C, heating is performed to 45-85 DEG C and heat preservation is performed for 4-10 hours to perform polymerization reaction, wherein the chain transfer agent is at least one of aliphatic-series mercaptan, carbon tetrachloride, sodium formate, inorganic phosphate, octanol, isopropanol, propyl alcohol or butanol; C, the material obtained in the step B is cooled to room temperature, and separation and purification are performed to obtain sodium polyacrylate. The discharging amount of the acrylic ester production wastewater is decreased. The obtained poly(methyl) sodium acrylate water scale inhibition effect is remarkably improved. The cost is low. By selecting the chain transfer agent and a separating method, the mass purity of separated sodium polyacrylate is above 90%, and the molecular weight dispersity is smaller and can be 1.2 or below.

Description

technical field [0001] The invention relates to a comprehensive treatment method for acrylate production wastewater, which belongs to the field of wastewater treatment. Background technique [0002] (Meth)acrylate wastewater belongs to industrial wastewater that is difficult to biodegrade. According to research at home and abroad, the treatment methods for acrylic acid and its ester wastewater can be divided into three types: physical method, chemical method and biological method. From the perspective of treatment effect, physical and chemical methods are relatively better than biological methods. For the treatment of acrylic acid and its ester wastewater, the more commonly used methods are incineration or dilution and discharge, but the treatment cost is too high, and it will cause huge damage to the local water environment and affect the personal health of local residents. With the in-depth research of advanced oxidation technology in recent years, there are also treatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/10C08F120/06F23G7/04C02F103/36
CPCC02F1/00C02F1/04C02F1/66C02F9/00C02F2103/36C08F120/06F23G7/04
Inventor 李光照覃福作全升东贺家江张玲
Owner JIANGSU RUIYANG CHEM
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