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Method for removing aldehyde, ketone and ester impurities in propylene oxide reaction liquid by low-temperature plasma modified material

A low-temperature plasma and low-temperature plasma technology, applied in the direction of organic chemistry, can solve the problems of high separation loss, low efficiency and high loss of propylene oxide, and achieve the effects of simple process, strong operability and low loss of propylene oxide

Active Publication Date: 2021-05-25
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Multi-stage rectification is a conventional method to remove aldehydes, ketones and esters in the HPPO process, but this method has high energy consumption, low efficiency, high separation loss, and high production costs
Patent CN01804651.7 discloses a method for refining propylene oxide products by extracting and rectifying water and other polar solvents, but cannot effectively remove aldehydes, ketones, and esters
Patent CN200380103986.5 discloses a method for extracting and rectifying propylene oxide with a compound containing an unsubstituted amine group. This method can effectively remove the impurities of aldehydes and ketones in the product, but the hydrazone products generated by the compound and aldehydes and ketones produce high Nitrogenous wastewater, difficult to treat
Patent CN201180017377.2 discloses a method for removing aldehydes in propylene oxide with amine functionalized resin, patent CN201110434173.0 discloses a method for removing aldehydes and ketones with basic resin, and patent CN201610115263.6 discloses a method for A method of removing aldehyde impurities by using a combination of resin and ethanolamine / hydrazine hydrate, but propylene oxide has a certain swelling effect on polymer resins, which causes problems such as high loss of propylene oxide, reduction of resin strength and fragmentation
Patent CN201610473450.1 discloses a method for adsorbing propylene oxide aldehyde impurities with modified molecular sieves. Although this method overcomes the problem of resin swelling, it is affected by molecular sieve adsorption efficiency and frequent regeneration

Method used

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  • Method for removing aldehyde, ketone and ester impurities in propylene oxide reaction liquid by low-temperature plasma modified material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]Example 1 Preparation of low temperature plasma modified materials

[0023](1) Low temperature plasma modified polyethylene

[0024]Put polyethylene into a low-temperature plasma treatment instrument cavity, close the cavity port, open the vacuum pump, vacuum to the vacuum in the cavity to 50 Pa or less, open the nitrogen gas and ammonia gas flow valve, control into nitrogen and ammonia The molar ratio is 1: 4, and then the high-frequency power is turned on, and after 500s under 80W, the modified polyethylene material is obtained.

[0025](2) Low temperature plasma modified polytetrafluoroethylene

[0026]Put polytetrafluoroethylene into a low-temperature plasma treatment instrument cavity, turn off the cavity port, open the vacuum pump, vacuum to the vacuum in the cavity to 50 Pa or less, open nitrogen gas and ammonia gas flow valve, control into nitrogen and ammonia The molar ratio of gas is 1: 5, and then the high-frequency power is turned on, after treatment of 360S under 120 W, obtai...

Embodiment 2

[0031]Example 2 Aderahyldone ester impurity in the propylene oxide reaction liquid

[0032]Four low-temperature plasma modified materials prepared in Example 1 were filled into the fixed bed reactor, and the hydroxopropane reaction solution of the HPPO process was 8 h at 40 ° C, 1.5 MPa.-1By a fixed bed reactor equipped with a low temperature plasma modified material, the content of the cycloxne concentration and alhyde ketone ester in the fixed bed, and the useful life of the modified material (deactivated indicator is aldone) The ester impurity removal rate is less than 95%), and the experimental results are shown in Table 1.

[0033]Table 1 Low temperature plasma modified material removes aldone ester impurities in the propylene oxide reaction liquid

[0034]

[0035]The content of the present invention is not limited to the embodiment of the present invention.

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Abstract

The invention provides a method for removing aldehydes, ketones, and ester impurities in a propylene oxide reaction solution. The low-temperature plasma modification method is used to insert free amino groups on the surface of the material, which can effectively remove aldehydes in the propylene oxide reaction solution. The removal rate of ketone ester impurities and aldehyde ketone ester impurities is over 95%, the process is simple, and the loss of propylene oxide is low.

Description

Technical field[0001]The present invention belongs to the field of petrochemical technology, and it is related to a method of removing a low temperature plasma modified material to remove alhyde ketone ester impurities in the propylene oxide reaction liquid.Background technique[0002]Propylene Oxide, PO is secondly large propylene derivative secondary propylene derivative, which is a very important base organic chemical raw material, mainly used to produce polyether polyols, and to produce polyurethane, and can also be used to produce propylene glycol , Acrylic alcohol, isopropanolamine, etc. The existing industrial production method mainly includes a chlorinel method, a Halcon Method (Halcon), and the Hydrogen peroxide Direct Oxidation (HPPO). The HPPO method is a catalyst using a titanium silicon molecular sieve, and the hydroxide is used to synthesize propylene oxide, overcome the deterioration of the chloropropolic equipment, the disadvantage of the waste liquid, waste slag, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/32
CPCC07D301/32C07D303/04
Inventor 王根林丁克鸿徐林刘相李王铖马春辉殷恒志刘鑫
Owner JIANGSU YANGNONG CHEM GROUP
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