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Method for preparing propylene glycol monomethyl ether

A technology of propylene glycol monomethyl ether and alcoholysis, which is applied in the direction of preparation of ether from alkylene oxide, preparation of ether, chemical instruments and methods, etc. It can solve the problems of runaway temperature, low work efficiency, high catalyst bed temperature, etc., and achieve high epoxy Effect of propane conversion rate and service life extension

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the alcoholysis of propylene oxide catalyzed by molecular sieves is used to prepare propylene glycol monomethyl ether in a fixed bed reactor, the local temperature in the catalyst bed is too high during the reaction process, and the problem of overheating occurs, and after the catalyst is deactivated During regeneration, work needs to be stopped and work efficiency is low

Method used

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  • Method for preparing propylene glycol monomethyl ether
  • Method for preparing propylene glycol monomethyl ether
  • Method for preparing propylene glycol monomethyl ether

Examples

Experimental program
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Embodiment approach

[0058] According to a preferred embodiment of the present invention, the alkali source is one or more of ammonia, aliphatic amine, aliphatic alcohol amine and quaternary ammonium base.

[0059] In the present invention, the quaternary ammonium base can be various organic quaternary ammonium bases, and the aliphatic amine can be various NH 3 A compound formed by replacing at least one hydrogen in an aliphatic hydrocarbon group (preferably an alkyl group). The aliphatic alcohol amine can be various NH 3 A compound in which at least one hydrogen is substituted by a hydroxyl-containing aliphatic hydrocarbon group (preferably an alkyl group).

[0060] Specifically, the quaternary ammonium base may be a quaternary ammonium base represented by formula II, the aliphatic amine may be an aliphatic amine represented by formula III, and the aliphatic alcohol amine may be an aliphatic amine represented by formula IV Alcoholamine:

[0061]

[0062] In formula II, R 1 , R 2 , R 3 And R 4 Each C 1 -...

preparation example 1

[0082] Preparation of titanium silicon aluminum molecular sieve

[0083] (1) Take TS-1 molecular sieve (prepared according to the method described in "Zeolites, 1992, Vol.12: 943~950", TiO 2 The mass percentage is 2.1%) placed in a 100mL slurry bed reactor with continuous feeding and membrane separation device, and under stirring, a mixture of water and 30wt% hydrogen peroxide is added at a rate of 5.7mL / h ( The volume ratio of water to hydrogen peroxide is 10:9), the mixture of cyclohexanone and tert-butanol is added at a rate of 10.5mL / h (the volume ratio of cyclohexanone and tert-butanol is 1:2.5), and the ratio is 5.7 Add 36wt% ammonia water at the rate of mL / h. The above three streams are added at the same time and continuously discharged at the corresponding rate. The reaction temperature is maintained at 80℃. After the reaction is stable, the product is sampled every 1h. The liquid phase is measured by gas chromatography. Analyze the composition, use the following formula ...

Embodiment 1

[0093] Propylene oxide, methanol, acetone as a solvent, and molecular sieve TS-A prepared in Preparation Example 1 as a catalyst were continuously fed into the moving bed reactor to perform contact reaction. Among them, propylene oxide is fed from the lower feed port of the reactor, and the mixture of methanol and solvent and the catalyst are fed into the reactor from the liquid phase feed port and the solid phase feed port located at the top of the reactor, respectively. Among them, the feed rate of propylene oxide is 50 mL / min, the molar ratio of propylene oxide to methanol is 1:2, the weight ratio of solvent to propylene oxide is 10:1, and the weight ratio of propylene oxide to catalyst is 8. :1. The temperature in the reactor is 65°C, and the pressure in the reactor is 1.0 MPa. During operation, the catalyst output from the bottom of the reactor is directly recycled without regeneration. The reaction mixture obtained 1h and 12h after the start of the reaction was analyzed ...

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Abstract

The present invention relates to the field of propylene glycol monomethyl ether production, and discloses a propylene glycol monomethyl ether preparation method, which comprises that propylene oxide,methanol and a catalyst contact in the reaction zone of a moving bed reactor under an alcoholysis reaction condition, wherein the catalyst contains a titanium-silicon-aluminum molecular sieve. According to the method, the problems of temperature runaway of a catalyst bed layer and the like possibly occurring in a fixed bed reactor can be effectively avoided, the high propylene oxide conversion rate and the selectivity of 2-methoxy-1-propanol (MME-2) in propylene glycol monomethyl ether can be obtained, and the service life of the catalyst can be prolonged; and the catalyst with the activity incapable of meeting the requirement can be moved out of the reaction zone and is regenerated under the condition that the device is not shut down.

Description

Technical field [0001] The invention relates to the field of production of propylene glycol monomethyl ether, in particular to a method for preparing propylene glycol monomethyl ether. Background technique [0002] Propylene glycol ether, especially propylene glycol monomethyl ether is an important chemical product. Propylene glycol monomethyl ether has two isomers, namely 1-methoxy-2-propanol (MME-1) and 2-methoxy Methyl-1-propanol (MME-2). Because of its chemical structure, there are two groups with strong solubility-ether bond and hydroxyl group. The former is hydrophobic and can dissolve hydrophobic compounds; the latter is hydrophilic and can dissolve water-soluble substances. Therefore, Propylene glycol ether is a universal solvent with excellent performance, also known as a universal solvent. Propylene glycol monomethyl ether has a faint ether smell but no strong pungent smell, making it more widely and safer and can be used in many fields. For example, propylene glycol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/03C07C43/13B01J29/90B01J29/89
CPCC07C41/03B01J29/90B01J29/89C07C43/13Y02P20/584
Inventor 史春风林民朱斌
Owner CHINA PETROLEUM & CHEM CORP
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