Efficient joint production method of propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate

A technology for propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the field of high-efficiency co-production of propylene glycol methyl ether and propylene glycol methyl ether acetate, and can solve the problems of unsatisfactory catalytic effect and process, high separation energy consumption, and high cost of wastewater treatment. , to achieve the effect of improving comprehensive utilization rate, good application performance and low energy consumption cost

Inactive Publication Date: 2019-05-24
谦信化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst used in this process is a liquid acid catalyst, and the catalytic effect and process are not ideal
And because esterification produces water, there is azeotropy with propylene glycol methyl ether and propylene glycol methyl ether acetate, and they are miscible, so it is necessary to increase the water-carrying agent for separation, the separation energy consumption is high, and the cost of wastewater treatment is high

Method used

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  • Efficient joint production method of propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate
  • Efficient joint production method of propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate

Examples

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preparation example Construction

[0027] (1), Preparation of propylene glycol methyl ether crude ester: After mixing the raw materials propylene oxide and methanol evenly, under the catalytic condition of a medium-strong alkali solid catalyst, the propylene glycol methyl ether crude ester is generated successively through a constant temperature reactor and an adiabatic reactor. In the adiabatic reactor, the boring of flowing methyl acetate as the heat conduction oil pipe;

[0028] (2) Preparation of propylene glycol methyl ether acetate: Part of the propylene glycol methyl ether crude ester generated in step (1) is transferred to the esterification tower and mixed with the preheated methyl acetate in the heat conduction oil pipe, and transesterified under the acidic cationic resin The reaction produces propylene glycol methyl ether acetate.

[0029] Further, the molar ratio of propylene oxide to methanol in step (1) is 1:3-1:5; the reaction pressure of the adiabatic reactor is 0.8-2 MPa.

[0030] Further, in ...

Embodiment 1

[0034] The invention discloses a method for high-efficiency co-production of propylene glycol methyl ether and propylene glycol methyl ether acetate, using propylene oxide, methanol, and methyl acetate as raw materials, comprising the following steps:

[0035] (1), Preparation of propylene glycol methyl ether crude ester: After mixing the raw materials propylene oxide and methanol evenly, under the catalytic condition of a medium-strong alkali solid catalyst, the propylene glycol methyl ether crude ester is generated successively through a constant temperature reactor and an adiabatic reactor. In an adiabatic reactor, the flowing methyl acetate is used as the bore of the heat conducting oil tube. In this step, the molar ratio of propylene oxide to methanol is 1:5; the reaction pressure of the adiabatic reactor is 1.4Mpa; the strong base solid catalyst is a basic resin solid base of tertiary amine or tertiary phosphine group.

[0036] (2) Preparation of propylene glycol methyl ...

Embodiment 2

[0038] The invention discloses a method for high-efficiency co-production of propylene glycol methyl ether and propylene glycol methyl ether acetate, using propylene oxide, methanol, and methyl acetate as raw materials, comprising the following steps:

[0039] (1), Preparation of propylene glycol methyl ether crude ester: After mixing the raw materials propylene oxide and methanol evenly, under the catalytic condition of a medium-strong alkali solid catalyst, the propylene glycol methyl ether crude ester is generated successively through a constant temperature reactor and an adiabatic reactor. In an adiabatic reactor, the flowing methyl acetate is used as the bore of the heat conducting oil tube. In this step, the molar ratio of propylene oxide to methanol is 1:4; the reaction pressure of the adiabatic reactor is 0.8Mpa; the strong base solid catalyst is a molecular sieve loaded with CaO and MgO.

[0040] (2) Preparation of propylene glycol methyl ether acetate: Part of the pr...

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PUM

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Abstract

The invention discloses an efficient joint production method of propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate. Propylene oxide, methanol and methyl acetate are takenas raw materials. The method comprises the steps of (1), the preparation of propylene glycol monomethyl ether raw esters: raw materials of the propylene oxide and the methanol are uniformly mixed andpass through a thermostatic reactor and a heat insulation reactor sequentially to generate the propylene glycol monomethyl ether raw esters under the catalytic condition of a medium and strong alkalisolid catalyst, flowing methyl acetate is adopted as a material for a thermal conductive oil pipe in a heat insulation reactor; (2), the preparation of propylene glycol monomethyl ether acetate: partof the propylene glycol monomethyl ether raw esters prepared in the step 1 and the methyl acetate which is preheated in the thermal conductive oil pipe are transferred to an esterification tower to bemixed, and the propylene glycol monomethyl ether acetate is generated by the interesterification reaction of the propylene glycol monomethyl ether raw esters and the methyl acetate which is preheatedin the thermal conductive oil pipe with the presence of acid positive ion resin. The method has the advantages of simple technology, high conversion efficiency and low energy consumption cost.

Description

technical field [0001] The invention relates to the technical field of propylene glycol methyl ether (PM) and propylene glycol methyl ether acetate (PMA), in particular to a method for co-producing propylene glycol methyl ether and propylene glycol methyl ether acetate with high efficiency. Background technique [0002] Propylene glycol monomethyl ether (PM) is a solvent with excellent performance and low toxicity, which has the characteristics of strong solvency, low volatility and high flash point. The molecular structure and physicochemical properties of PM are similar to glycol ethers, and PM is considered to be an ideal substitute for more toxic glycol ethers. [0003] The easiest way to prepare PM is the propylene oxide (PO) method, that is, under the catalysis of acid or base, PO reacts with lower aliphatic alcohols to prepare PM. The homogeneous acid-base catalyzed reaction has disadvantages such as low monoether selectivity, difficult post-treatment, difficult cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/03C07C43/13C07C41/03
Inventor 赵楚榜于冬娥胡兆雄
Owner 谦信化工集团有限公司
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