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Pretreatment method of epoxy resin desalinization wastewater

An epoxy resin, pretreatment technology, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of inability to remove, increase the number of filter membrane replacements, and cannot truly achieve pretreatment and other problems to achieve the effect of solving the easy blockage of the pipeline

Active Publication Date: 2012-07-11
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using microporous membrane filtration, the filtrate has high clarity, but it is easy to cause clogging due to its small pore size, and impurities such as epoxy resin in untreated wastewater contain certain viscosity, which will inevitably increase filtration during the production process. The number of membrane replacements results in a waste of manpower and material resources, and membrane filtration cannot remove epichlorohydrin and methyl isobutyl ketone in wastewater, which will still affect the effluent of subsequent multi-effect evaporation, which in turn will affect the evaporation efficiency. purpose of preprocessing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The process designed by the invention is used to pretreat the o-cresol novolac epoxy resin desalination wastewater of a chemical plant in Jinan, Shandong.

[0023] 1) First store the desalted wastewater in the wastewater storage tank, and let it settle naturally for 1 day. It is measured that the salt content of the wastewater is 17%, the COD is 9238mg / L, the content of epichlorohydrin is 323mg / L, and the content of methyl isobutyl ketone 1.4%;

[0024] 2) Drain the bottom sediment, put 8 tons of supernatant into a 10 cubic meter stainless steel reactor, adjust the pH value to 11.3 with sodium hydroxide, heat the coil to 70°C, and control the pressure in the reactor at 0.05MPa , stirred and reacted for 3 hours, during which steam was introduced for stripping for 30 minutes, and the volatile gas was condensed and recovered with a condenser;

[0025] 3) Pour the reaction solution into the sedimentation tank, and filter it with a plate and frame filter press. At this time...

Embodiment 2

[0028] The process designed by the invention is used to pretreat the o-cresol novolac epoxy resin desalination wastewater of a chemical plant in Jinan, Shandong.

[0029] 1) First store the desalted wastewater in the wastewater storage tank, and let it settle naturally for 1 day. The measured wastewater has a salt content of 18%, a COD of 10536 mg / L, an epichlorohydrin content of 370 mg / L, and a methyl isobutyl ketone content of 1.6 %;

[0030] 2) Drain the bottom sediment, pour 8 tons of supernatant into a 10 cubic meter stainless steel reactor, adjust the pH of the supernatant to 11.8 with sodium hydroxide, heat the coil to 85°C, and control the pressure inside the reactor Stir and react at 0.08MPa for 2 hours, during which steam is introduced for stripping for 30 minutes, and the volatile gas is condensed and recovered with a condenser;

[0031] 3) Pour the reaction solution into the sedimentation tank, and filter it through a plate and frame filter press. At this time, th...

Embodiment 3

[0034] The process designed by the invention is used to pretreat the o-cresol novolac epoxy resin desalination wastewater of a chemical plant in Jinan, Shandong.

[0035] 1) First store the desalted wastewater in the wastewater storage tank, and let it settle naturally for 1 day. The measured wastewater has a salt content of 17%, a COD of 8759 mg / L, an epichlorohydrin content of 295 mg / L, and a methyl isobutyl ketone content of 1.5 %;

[0036] 2) After draining the bottom sediment, pour 8 tons of waste water into a 10 cubic meter stainless steel reactor, adjust the pH value of the waste water to 12.3 with sodium hydroxide, heat the coil to 105°C, stir for 2 hours, and pass in steam Extract for 40 minutes, condense and recover volatile gas with a condenser;

[0037] 3) Pour the reaction solution into the sedimentation tank, and filter it through a plate and frame filter press. At this time, the COD of the supernatant was measured to be 4172mg / L, and epichlorohydrin was not det...

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Abstract

The invention relates to a wastewater treatment method, in particular to a pretreatment method for epoxy resin desalinization wastewater. The pretreatment method comprises the following steps of: storing desalinization wastewater in a wastewater storage tank, naturally settling for 1 day to precipitate epoxy resin with larger particle size, discharging epoxy resin precipitate at the bottom of the wastewater storage tank, pumping supernatant to a reaction kettle, adjusting the pH value to 11-13, heating, stirring for 1-3h while maintaining the temperature at 70-120 DEG C, introducing steam for at least 30min, condensing and recovering volatile gas with a condenser, pumping reaction liquid to a settling tank, carrying out plate-frame pressure filtration to remove gelatinized epoxy resin, and pumping filtrate to a multi-effect evaporator for concentration by evaporation. By adopting the process provided by the invention, epoxy resin, epoxy chloropropane, methyl isobutyl ketone and other impurities in the desalinization wastewater are effectively removed, the wastewater is sufficiently purified before entering the multi-effect evaporator, and the problems that the multi-effect evaporator pipeline is easy to block and the distilled water is high in COD (Chemical Oxygen Demand) are solved.

Description

[0001] technical field [0002] The invention relates to a wastewater treatment method, in particular to a pretreatment method for epoxy resin desalination wastewater. Background technique [0003] A large amount of desalination wastewater is produced in the production process of epoxy resin. Desalination wastewater is high-salt wastewater with a salt content of 10-23% and a COD of 8000-15000mg / L. It mainly contains epoxy resin, epichlorohydrin and methyl alcohol. Impurities such as isobutyl ketone, if not treated, directly enter the multi-effect evaporator for evaporation and concentration, which will easily cause pipeline blockage and high COD of distilled water. Therefore, pretreatment of desalination wastewater is necessary to remove epoxy in desalination wastewater. Impurities such as resin, epichlorohydrin and methyl isobutyl ketone. [0004] Chinese invention patent 200610051605.9 discloses a high-salt epoxy resin production wastewater membrane method integrated salt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/38
Inventor 唐一林唐路林刘海棚片冈英夫梁景奎赵新华
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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