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Glycol production waste water treatment method
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Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology for the production of waste water and treatment methods, which is applied in natural water body treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of wasting water resources, increasing the operating cost of waste water treatment, etc., and reduce pollution , The effluent water quality is good, and the effect of avoiding fouling is blocked
Active Publication Date: 2010-10-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The disadvantage of this method is that it not only wastes water resources, but also increases the operating cost of wastewater treatment
Method used
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Examples
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Effect test
Embodiment 1
[0023] A batch of production wastewater from an ethylene glycol production plant, which contains the following substances:
[0025] First, add 15 mg / l of polyaluminum chloride to the above waste water, adjust the pH of the waste water to 8.5, and stir evenly; then use a microfiltration membrane device for pre-filtration, and the microfiltration membrane used is a polymer polysulfone membrane with a pore size of 0.1 μm. The suspended solids content in the filtrate was reduced to ~0 after filtration.
[0026] The filtrate is further treated with reverse osmosis membrane modules to remove inorganic ions and organic matter in the filtrate. T...
Embodiment 2
[0035] A batch of production wastewater from an ethylene glycol production plant, which contains the following substances:
[0037] Add coagulant polyaluminum chloride 45 mg / l to the above waste water, adjust the pH of the waste water to 9.5, and stir evenly. Then adopt the same microfiltration membrane device as in Example 1 to pre-filter, and the suspended solids content in the obtained filtrate is reduced to 0; .
[0038] project
[0039] project
[0040] Silicide
[0041] After the above treatment, the effluent has reached the production process water standard.
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PUM
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Abstract
The invention relates to a method for treating wastewater generated during the production of glycol. The method treat wastewater generated during the production of glycol by processes of coagulation and alkali adjustment, prefiltration, nanofiltration and reverse osmosis. As for colloidal substances in the wastewater, the method adds a coagulant into the wastewater and raises the pH value of the wastewater slightly above 7.0 to destabilize and precipitate the colloidal substances and remove the colloidal substances in the prefiltration process, thereby avoiding the colloidal substances blocking a nanofiltration and reverse osmosis system, and contributing to stable operation of a membrane treatment process. The method is simple in process, good in treatment effect and stable in operation,and wastewater treated by the method can be directly reused as process water for production of glycol.
Description
technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a treatment method for ethylene glycol production waste water. Background technique [0002] Ethylene glycol is an important organic chemical raw material, mainly used in the manufacture of polyester fiber, antifreeze, non-ionic surfactant, ethanolamine and explosives. [0003] The main industrial production method of ethylene glycol is direct hydration of ethylene oxide. The method uses ethylene and oxygen as raw materials, and generates gaseous ethylene oxide under a certain ratio, temperature, and pressure conditions. After washing and stripping, ethylene oxide is obtained; ethylene oxide and water are added Under the conditions of high pressure (2.23MPa) and high temperature (190-200°C), ethylene glycol is produced by direct liquid-phase hydration in a tubular reactor, and diethylene glycol, triethylene glycol and polycondensed polyethylene glycol are produced...
Claims
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Application Information
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