Method for recovering polyether from waste metal processing liquid and application of polyether in concrete slump retaining agent

A technology for metal processing and processing waste liquid, applied in recycling technology, plastic recycling, chemical instruments and methods, etc., can solve problems such as poor safety, gas corrosion, large one-time investment, etc., to reduce equipment requirements and production costs , Improve production safety, the effect of a small one-time investment

Inactive Publication Date: 2011-09-07
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The evaporation method is to heat water to boiling, and then condense the water vapor to discharge waste water that meets the discharge regulations. It does not need to be sent to a public treatment plant for treatment. The main advantage is that the indicators after treatment are excellent, and all kinds of waste liquids can meet the discharge standards after treatment. The process is simple. It is easy to operate, but its disadvantages are high energy consumption (converting liquid water into water vapor requires a lot of energy), poor safety, possible fire and explosion, most of them require an air pollution discharge permit, and the gas has corrosion or unpleasant smell (especially waste liquid When there are sulfides in the medium), a larger space is required
The application of chemical method is more common than other treatment methods. It is suitable for both large and small amounts. It also includes two methods: inorganic salt separation (acid-aluminum method) and polymer (cationic surfactant) separation. These methods are based on surface tension In essence, the flocculation of aluminum hydroxide and polymer is used to separate the changes of pH value and pH value. The price of this method is moderate and it is conducive to medium and large-scale treatment. Unable to achieve polyether recycling
Membrane separation is divided into three methods: microporous filtration, ultrafiltration and reverse osmosis. The most commonly used method is ultrafiltration membrane treatment, which generally requir

Method used

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  • Method for recovering polyether from waste metal processing liquid and application of polyether in concrete slump retaining agent
  • Method for recovering polyether from waste metal processing liquid and application of polyether in concrete slump retaining agent
  • Method for recovering polyether from waste metal processing liquid and application of polyether in concrete slump retaining agent

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Polyether recovery process

[0040] 1000L of water-based metal processing waste liquid with a polyether (polyethylene glycol ether) content of 9% was added to the reactor, sodium hydroxide was added to adjust the pH to 10, the reaction was left to stand for 1 hour, filtered, and the filtrate was taken. Add 1kg of activated carbon, add sulfuric acid to adjust the pH to 4-5, add 5kg of sodium sulfate, heat to about 5-10°C above the cloud point temperature of polyether, until the solution starts to separate, and stand at constant temperature for 1h; take the upper polyether phase, add 0.5% hydroquinone and other antioxidants, heated to 105 ° C, fully dried to remove water, and obtained 83 kg of polyether products with a recovery rate of 92% and a purity of 94%.

[0041] (2) Synthesis process of concrete slump retaining agent

[0042] 10kg of polyether, 50g of p-toluenesulfonic acid, and 1.2kg of maleic anhydride were esterified at 107°C for 4 hours. After cooling down...

Embodiment 2

[0044] (1) Polyether recovery process

[0045] It is to add 1000L water-based metal processing waste liquid with a content of 5% polyether (polyethylene glycol ether) in the reaction kettle. The polyether is polyethylene glycol ether or polyoxyethylene oxypropylene ether, and its molecular weight is 800-4000, add potassium hydroxide to adjust the pH value to 11, let it stand for 1 hour, filter, take the filtrate, add 1 kg of activated carbon, add sulfuric acid to adjust the pH to 4-5, heat to the temperature above the cloud point of polyether, that is, about 5-10°C, until the solution starts to separate, keep it at constant temperature for 1h; take the upper polyether phase, add 0.05% benzoquinone antioxidant, heat to 105°C, fully dry and remove water, and obtain 45kg of polyether product, the recovery rate is 90% , 95% purity.

[0046] (2) Synthesis process of concrete slump retaining agent

[0047] 10kg of polyether, 10g of sodium bisulfate, and 1kg of maleic anhydride wer...

Embodiment 3

[0049] (1) Polyether recovery process

[0050] 1000L of water-based metal processing waste liquid with a content of 50% of polyether (polyoxyethylene oxypropylene ether) is added to the reactor, and potassium hydroxide and 25-28% wt of concentrated ammonia water are added to adjust the pH value to 12. Stand to react for 1.5h, filter, take the filtrate, add 5kg of activated carbon, add nitric acid and phosphoric acid to adjust the pH to 4-5, add 25kg of potassium nitrate, heat to about 5-10°C above the cloud point temperature of polyether, until the solution starts to separate , standing at constant temperature for 2 hours; take the upper polyether phase, add 0.8% of hydroquinone and other antioxidants, heat to 105 ° C, fully dry and remove water, and obtain 460 kg of polyether product with a recovery rate of 92% and a purity of 92%.

[0051] (2) Synthesis process of concrete slump retaining agent

[0052] 10kg of polyether, 30g of sulfuric acid, nano-montmorillonite, 1.96kg o...

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PUM

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Abstract

The invention discloses a method for recovering polyether from waste metal processing liquid and application of the polyether in concrete slump retaining agent. The method for recovering the polyether from the waste metal processing liquid comprises the following steps: adding inorganic base to water-based waste metal processing liquid containing the polyether to adjust the pH value of the waste metal processing liquid to 10-12, standing the waste metal processing liquid for reaction, filtering, adding activated carbon and an inorganic acid to adjust the pH value of the waste metal processing liquid, heating to the temperature above the cloud point temperature, layering solution, standing at constant temperature, taking polyether phase on the upper layer, adding anti-oxidant to the polyether phase, and fully drying to remove water until the water content is 0.05 percent by weight or less to obtain the reaction product which is polyether. The following raw materials are needed when the polyether is applied to the concrete slump retaining agent: a catalyst, maleic anhydride, water, sulfonated styrene and an initiator in addition to the polyether. The polyether and the maleic anhydride are directly subjected to the esterification reaction under the heating condition without adding organic solvent and water and adopting a condensing and refluxing device, thus the equipment requirement and the production cost are reduced, and the production safety is improved. The prepared concrete slump retaining agent has good slump retaining performance, high water reducing rate and good compatibility with cement.

Description

[0001] technical field [0002] The invention relates to a technology for recovering polyether from water-based metal processing fluid and its application in the preparation of environment-friendly high-performance concrete slump-retaining agent. Background technique [0003] The application of water-based metalworking fluids has been very popular. Water-soluble polyether is an important component of many water-based metalworking fluids. Compared with general water-soluble oily agents, especially fatty acid soaps, it has better cooling, stability, Antibacterial, hard water resistance and defoaming properties, it has good extreme pressure, and has a significant synergistic effect with fatty acids or phosphates, and has a long service life, no obvious harm to the human body, and low physiological and ecological toxicity , does not cause corrosion to metals, and is widely used in metal processing. There are three main types of water-based metalworking fluids: emulsion, micro...

Claims

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Application Information

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IPC IPC(8): C08J11/06C08L71/02C02F9/04C04B24/16C08F290/06C08G65/332
CPCY02W30/62
Inventor 何辉蒋亚清刘小艳谢岩
Owner HOHAI UNIV
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