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Method for treating waste water produced in production of EDTA (ethylene diamine tetraacetic acid)

A technology for wastewater and emulsion membrane, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., and can solve problems such as affecting evaporation effect, increasing the concentration of evaporated materials, and increasing viscosity. , to achieve the effect of reducing production cost and improving evaporation effect

Active Publication Date: 2014-09-24
潍坊滨海石油化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for treating waste water produced by EDTA production, which aims to solve the problem of single-effect or multi-effect evaporation of waste water produced by existing EDTA production, because it contains a large amount of organic matter, and during the evaporation process, the concentration of evaporated materials is continuously increased. The viscosity is constantly increasing, which greatly affects the technical problem of evaporation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of emulsion liquid film: get 100kg kerosene, 2kgtween-80 is made surfactant, add trioctylamine 3kg, 8wt% caustic soda 30kg, prepare emulsion liquid film by traditional method under room temperature.

[0035] 2. Measure waste water composition: use sulfuric acid to carry out acidification in the preparation EDTA process, the waste water that produces is measured through liquid chromatography wherein EDTA content 0.35wt% in EDTA waste water, nitrilotriacetic acid 0.4wt%, glycolic acid 0.45wt%, formic acid 0.35wt% %.

[0036] 3. Extraction: add soda ash solution to the waste water to adjust the pH value of the waste water to 2-5. The extraction is carried out in a small extraction tower, and the extraction temperature is kept at 20-40°C. Take 1350 kg of waste water from the top of the extraction tower at a flow rate of 30 kg / h Add, the emulsion film is added from the bottom of the extraction tower at a speed of 20kg / h, and the extraction is completed in the ...

Embodiment 2

[0039] 1. The preparation of emulsion liquid film: get 100kg kerosene, 3kgspan-80 make surfactant, add trioctylamine 5kg, 20wt% caustic soda 40kg, under room temperature, prepare emulsion liquid film by traditional method.

[0040] 2. measure the composition of concentrated wastewater: measure EDTA content 0.65wt% in EDTA wastewater by liquid chromatography, nitrilotriacetic acid 0.6wt%, glycolic acid 0.95wt%, formic acid 0.7wt%.

[0041]3. Extraction: Add caustic soda solution to the waste water to adjust the pH value of the waste water to 2~5. The extraction is carried out in a small extraction tower. The extraction temperature is kept at 20~40°C. Take 450kg of waste water from the extraction tower at a flow rate of 20kg / h. Added at the top, the emulsion is added from the bottom of the extraction tower at a speed of 15kg / h, and the extraction is completed in the extraction tower, and the waste water is re-measured after extraction: EDTA content 0.05wt%, nitrilotriacetic acid ...

Embodiment 3

[0044] 1. Preparation of emulsion liquid film: get 90kg kerosene, 5kgtween-80 is made surfactant, add trioctylamine 5kg, 0.2wt% caustic soda 66.7kg, prepare emulsion liquid film by traditional method under room temperature.

[0045] 2. Measure waste water composition: use hydrochloric acid to carry out acidification in the preparation EDTA process, the waste water that produces is measured through liquid chromatography wherein EDTA content 0.4wt%, nitrilotriacetic acid 0.45wt%, glycolic acid 0.5wt%, formic acid 0.35wt%.

[0046] 3. Extraction: add soda ash solution to the wastewater to adjust the pH value of the wastewater to 3-4. The extraction is carried out in a series of multiple kettles. The extraction temperature is kept at 20-40°C. Take 1000kg of wastewater from the first end of the series at a flow rate of 30kg / h. The reactor is added, and the emulsion liquid film is added from the reactor at the end of the series at a speed of 20kg / h. The extraction is carried out in t...

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Abstract

The invention belongs to the technical field of waste water treatment and in particular relates to a method for treating waste water produced in production of EDTA (ethylene diamine tetraacetic acid). The method for treating the waste water produced in production of EDTA comprises the following steps: (1) preparing an water-in-oil emulsion membrane, wherein the membrane phase of the water-in-oil emulsion membrane is composed of 1-5wt% of surface active agent, 1-5wt% of flowing carrier and 90-98wt% of diluent, the internal phase of the emulsion membrane is composed of 0.2-30wt% of caustic soda solution, the mass ratio of the membrane phase to the internal phase is (1.5-5):1, the surface active agent is tween-80 or span-80, the flowing carrier is trioctylamine, and the dilutent is kerosene; (2) regulating pH value of the waste water, then adding the emulsion membrane obtained in the step (1) into the waste water to carry out extraction, and carrying out evaporative crystallization treatment on the waste water after extraction is carried out; (3) demulsifying the extracted emulsion membrane to make a new emulsion membrane. The method for treating the waste water produced in production of EDTA has the advantages that organic matters in the waste water are extracted out, evaporation effect is greatly improved, and production cost is low.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating wastewater produced in EDTA production. Background technique [0002] Ethylenediaminetetraacetic acid, referred to as EDTA (Ethylene Diamine Tetraacetic Acid), is an important chelating agent, used in photographic chemicals, water treatment agents, chemical (cystine) refining, detergents, textile auxiliaries, leather chemicals, It has important applications in papermaking chemicals, pharmaceuticals, synthetic rubber, micro-fertilizer production and other fields. [0003] The industrial production methods of EDTA mainly include chloroacetic acid method and sodium cyanide method. The chloroacetic acid method has basically been eliminated. At present, the sodium cyanide method is basically used in the production of EDTA. The main raw materials for the production of EDTA by the sodium cyanide method are ethylenediamine, formaldehyde, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 马会楼郭希田
Owner 潍坊滨海石油化工有限公司
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