Resource utilization method for saponification waste water producing epoxypropane by chlorohydrination process

A method of propylene oxide and saponification wastewater technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to support sustainable development, good economic benefits, and improve economic benefits Effect

Active Publication Date: 2012-01-18
JILIN UNIV
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Problems solved by technology

[0009] Aiming at the problem of treating the existing chlorohydrin method propylene oxide saponification wastewater, the present invention proposes a reso

Method used

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  • Resource utilization method for saponification waste water producing epoxypropane by chlorohydrination process
  • Resource utilization method for saponification waste water producing epoxypropane by chlorohydrination process
  • Resource utilization method for saponification waste water producing epoxypropane by chlorohydrination process

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Embodiment 1

[0030] Step 1. Put a certain amount of saponification wastewater shown in Table 1 in the reactor, feed carbon dioxide, stop the ventilation when the pH value drops below 7, and then add 0.4mol / L of Sodium carbonate solution until the calcium ion removal rate reaches 99%, and the reaction temperature is controlled at 25°C. After solid-liquid separation, the precipitated calcium carbonate is washed and dried to obtain nano-scale calcium carbonate with a particle size of 80-100nm, calcite crystal form, and spherical shape.

[0031] Step 2. Take the filtrate after the above solid-liquid separation and put it in an electrolytic cell without a diaphragm. The anode of the electrolytic cell is a mesh flat Ti / PbO 2 Oxide-coated electrode, stainless steel as the cathode, the anode and cathode have the same area, adjust the pH value to 6-7, perform constant current electrolysis at room temperature, and the current density is 50mA / cm -2 , take samples at regular intervals, monitor COD, a...

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Abstract

The invention provides a resource utilization method for saponification waste water producing epoxypropane by a chlorohydrination process from the perspectives of cleaner production and circular economy, which aims at the traditional processing problem of the saponification waste water producing the epoxypropane by the chlorohydrination process. Calcium chloride in the saponification waste water is converted into precipitated calcium carbonate and meanwhile dilute brine containing organic matter is obtained. The precipitated calcium carbonate can be prepared into nano and micron products and can be applied to dope, plastic processing, rubber, printing ink, paper making and the like; after the impurity of the organic matter in the dilute brine is removed, electrolysis brine is prepared through membrane method concentration according to the requirements of chlor-alkali electrolysis and balanced enterprise water utilization; and fresh water after membrane separation can be recycled as process water. The resource utilization method for the saponification waste water of producing the epoxypropane by the chlorohydrination process has the advantage that the saponification waste water is applied as a resource; and while the waste water is processed, a precipitated calcium carbonate powder material, salt and the water are obtained so that the resource utilization method has better economic benefit, environmental benefit and social benefit.

Description

technical field [0001] The invention relates to a treatment method for wastewater produced by chlorohydrin method propylene oxide, in particular to resource utilization of chlorohydrin method propylene oxide saponification wastewater. Background technique [0002] Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is an important basic organic chemical raw material with wide application fields and good prospects. The demand is increasing year by year. [0003] The production process of propylene oxide by chlorohydrin method is the main method of propylene oxide production at home and abroad at present, and 90% of propylene oxide in my country is produced by chlorohydrinization process. The characteristics of this process are short process, mature process, large operating flexibility, good selectivity, high yield, low requirements on propylene specifications, less investment and relatively safe production. The main problem is ...

Claims

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Application Information

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IPC IPC(8): C01F11/18C02F9/06
Inventor 林海波门立娜程红波张红岩李慧婷
Owner JILIN UNIV
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