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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: 2022-07-15
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 amines, aliphatic alcohol amines and quaternary ammonium bases.

[0059] In the present invention, the quaternary ammonium base can be various organic quaternary ammonium bases, and the aliphatic amine can be various NH3 A compound formed after at least one hydrogen is replaced by an aliphatic hydrocarbon group (preferably an alkyl group), the aliphatic alcohol amine can be various NH 3 A compound formed after at least one hydrogen is replaced by a hydroxyl-containing aliphatic hydrocarbon group (preferably an alkyl group).

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

[0061]

[0062] In formula II, R 1 , R 2 ,...

preparation example 1

[0082] Preparation of titanium-silicon-alumina molecular sieve

[0083] (1) Take TS-1 molecular sieve (prepared by the method described in "Zeolites, 1992, Vol.12: 943-950", TiO 2 The mass percentage of 2.1%) was placed in a 100 mL slurry bed reactor with a continuous feeding and membrane separation device, and a mixture of water and 30 wt% hydrogen peroxide was added at a rate of 5.7 mL / h under stirring ( The volume ratio of water to hydrogen peroxide is 10:9), and the mixture of cyclohexanone and tert-butanol (the volume ratio of cyclohexanone and tert-butanol is 1:2.5) is added at a rate of 10.5 mL / h, and the volume ratio of cyclohexanone and tert-butanol is 1:2.5. 36wt% ammonia water was added at a rate of mL / h, the above three streams were added at the same time, and the material was continuously discharged at the corresponding speed at the same time, the reaction temperature was maintained at 80 ° C, and the product was sampled every 1h after the reaction stabilized. Th...

Embodiment 1

[0093] Propylene oxide, methanol, acetone as a solvent, and molecular sieve TS-A prepared in Preparation Example 1 as a catalyst were respectively continuously fed into the moving bed reactor for contact reaction. Wherein, 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. Wherein, the feed rate of propylene oxide is 50mL / 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 1.0MPa. 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 b...

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Abstract

The invention relates to the production field of propylene glycol monomethyl ether, and discloses a method for preparing propylene glycol monomethyl ether. The method comprises: under alcoholysis reaction conditions, placing propylene oxide, methanol and a catalyst in a reaction zone of a moving bed reactor In contact, the catalyst contains a titanium-silicon-alumina molecular sieve. The method of the invention can effectively avoid problems such as the catalyst bed temperature flying that may occur in the fixed bed reactor, and can not only obtain high propylene oxide conversion rate and 2-methoxy-1-propanol in propylene glycol monomethyl ether (MME-2) selectivity, and can prolong the service life of the catalyst; at the same time, the catalyst whose activity cannot meet the requirements can be moved out of the reaction zone for regeneration without the equipment being shut down.

Description

technical field [0001] The invention relates to the production field 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, 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 dissolving ability - 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 general-purpose solvent with excellent performance, also known as a universal solvent. Propylene glycol monomethyl ether has a weak ether smell, but no strong pungent smell, making it more widely used and safe, and can be used in many fields. For example, ...

Claims

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Application Information

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Patent Type & Authority Patents(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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