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P-hydroxybenzoic acid production wastewater treatment system

A technology for the production of p-hydroxybenzoic acid and waste water, which is applied in natural water treatment, water/sewage treatment, multi-stage water/sewage treatment, etc. It can solve the problems of inconsistent treatment process, unfavorable environmental sustainable development, inconvenient operation, etc. problems, to achieve the effect of improving adsorption efficiency, improving resource recycling rate, and reducing production recycling costs

Pending Publication Date: 2022-06-03
宿迁思睿屹新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, the purpose of the present invention is to provide a kind of p-hydroxybenzoic acid production wastewater treatment system, to solve the equipment investment of prior art is bigger, the whole treatment process can not be unified, simultaneously operation is inconvenient, to mother liquor and washing liquid The recovery efficiency of potassium sulfate, p-hydroxybenzoic acid and phenol is low, which is not conducive to the technical problem of sustainable development of the environment

Method used

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Experimental program
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Effect test

Embodiment 1

[0036] A p-hydroxybenzoic acid production wastewater treatment system, such as Figure 1-2 As shown, it includes p-hydroxybenzoic acid production wastewater, and the p-hydroxybenzoic acid production wastewater includes a mother liquor pool and a washing liquid pool. The mother liquor air-cooled finned tube is connected to the mother liquor macroporous resin adsorption tower, the mother liquor macroporous resin adsorption tower is connected to an electrochemical oxidation tank, the electrochemical oxidation tank is connected to a three-effect evaporator, and the three-effect evaporator is also connected to potassium sulfate In the recovery tank, the solid after the evaporation of the waste liquid is potassium sulfate, the washing liquid air-cooled fin tube is connected to the washing liquid macroporous resin adsorption tower, and the washing liquid macroporous resin adsorption tower and the mother liquor mother liquor macroporous resin adsorption tower are both connected The pr...

Embodiment 2

[0038]The mother liquor waste water produced in the production of p-hydroxybenzoic acid, the waste water temperature is 45 ℃, the appearance is yellow, the pH value is 2.5, the mother liquor waste water is first cooled to normal temperature by the mother liquor air-cooled fin tube, the COD in the filtrate is 10000, and the filtrate is at a temperature of 25 ℃ Under the condition of 10BV / hr flow rate, it passes through the mother liquor macroporous resin adsorption tower, the mother liquor macroporous resin adsorption tower collects the adsorption effluent COD below 100, and the effluent flows into the electrochemical oxidation tank to remove the slightly soluble phenol and p-hydroxybenzoic acid in the water, and then Potassium sulfate solid is obtained by evaporation in a three-effect evaporator. After 8 hours of adsorption by the mother liquor macroporous resin, the mother liquor macroporous resin is saturated with adsorption, and is eluted with 5% sodium hydroxide solution in ...

Embodiment 3

[0040] The washing liquid wastewater produced in the production of p-hydroxybenzoic acid, the temperature of the wastewater is 40 ° C, the appearance is light yellow, the pH value is 2.0, the washing liquid wastewater is first cooled to room temperature by the washing liquid air-cooled fin tube, the COD in the filtrate is 8000, and the filtrate is At a temperature of 25°C, the macroporous resin adsorption tower of the washing liquid is carried out at a flow rate of 10 BV / hr. The macroporous resin adsorption tower of the washing liquid collects the adsorbed effluent with COD below 100. The macroporous adsorption resin of the washing liquid is adsorbed and washed for 8 hours. The liquid macroporous resin is saturated with adsorption, and is eluted with 5% sodium hydroxide solution in the primary resin desorption tank. It is a high-concentration desorption solution, which is then eluted with pure water in the secondary resin desorption pool. The eluate after elution in the seconda...

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Abstract

The invention discloses a p-hydroxybenzoic acid production wastewater treatment system, and relates to the field of wastewater treatment, the p-hydroxybenzoic acid production wastewater treatment system comprises p-hydroxybenzoic acid production wastewater, and the p-hydroxybenzoic acid production wastewater comprises a mother liquid pool and a washing liquid pool; the mother liquor water tank and the washing liquor water tank are respectively connected with a mother liquor air cooling finned tube and a washing liquor air cooling finned tube, an electrochemical oxidation tank, a triple-effect evaporator, a washing liquor macroporous resin adsorption tower, a mother liquor macroporous resin adsorption tower, a primary resin desorption tank, a secondary resin desorption tank, a layering device, an acidification filtering tank, a distiller, a desorption liquor preparation tank and a separation wastewater tank; and the separation wastewater tank is connected with the aerobic biological fluidized bed, the vertical baffling anaerobic sludge bed, the sedimentation tank and the water quality detection station. The mother liquor wastewater and the washing liquor wastewater are treated at the same time, the wastewater treatment efficiency is greatly improved, the arrangement and installation cost of sewage treatment equipment is reduced, the adsorption efficiency of resin is improved, the resource recycling rate is increased, and it is guaranteed that treated sewage does not affect the environment.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a waste water treatment system for p-hydroxybenzoic acid production. Background technique [0002] Para-hydroxybenzoic acid is a widely used organic synthesis raw material, and its downstream products are widely used in food, cosmetics, medicine, dyes, fragrances, and the existing industrial production of hydroxybenzoic acid is mostly phenol and potassium hydroxide to form potassium phenolate, Potassium phenolate is carbon-carboxylated with carbon dioxide at high temperature to obtain potassium salt of p-hydroxybenzoic acid, and then acidified to obtain p-hydroxybenzoic acid. The production process will inevitably produce chemical waste water, which is colorless to yellow acidic liquid. Ph is around 2, and the COD of wastewater produced by different processes ranges from thousands to 10,000 to 20,000, which mainly contains phenol, p-hydroxybenzoic acid, potassium sulfate, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/34C02F103/36
CPCC02F9/00C02F1/285C02F1/4672C02F1/048C02F2101/34C02F2101/345C02F2103/36C02F2303/16C02F1/66C02F3/30
Inventor 柯友斌张小雷刘雷何珉
Owner 宿迁思睿屹新材料股份有限公司
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