Method for preparing ethylene glycol diacetate and sec-butanol and catalyst system and device used in method

A technology of diethylene glycol and sec-butyl acetate, applied in chemical instruments and methods, separation methods, alcoholysis preparation and other directions, can solve the problems of low single-pass conversion rate of n-butene of raw material purity, and achieve high product yield, The effect of long catalyst life and improved reaction conversion and yield

Active Publication Date: 2019-07-02
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the different catalysts used, the direct hydration method is divided into the resin method and the heteropolyacid method. Although this process does not consume a la

Method used

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  • Method for preparing ethylene glycol diacetate and sec-butanol and catalyst system and device used in method
  • Method for preparing ethylene glycol diacetate and sec-butanol and catalyst system and device used in method

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preparation example Construction

[0048] 2) Preparation of molecular sieve membrane on stainless steel wire mesh substrate

[0049] Sodium metaaluminate (NaAlO 2 ) as the aluminum source, orthoethyl silicate (TEOS) as the silicon source, and tetrapropylammonium hydroxide (TPAOH) as the templating agent. 2 O:Na 2 O:SiO 2 : TPAOH molar ratio = 1:0.005:0.03:0.015 ratio mixing, stirring at room temperature for 4h; pour the above synthetic liquid into the crystallization kettle, vertically immerse the above stainless steel wire mesh substrate in the solution, and hydrothermally heat it at 200°C Crystallize for 3 days; wash the above-mentioned molecular sieve membrane precursor with deionized water to neutrality, and dry it at 110°C for 1 day, and then bake it at 550°C for 5 hours in an air atmosphere to remove the template agent. A molecular sieve membrane is obtained on the net substrate.

[0050] The reaction section is filled with wire mesh packing whose surface is coated with ZSM-5 molecular sieve membrane....

Embodiment 1

[0052] Attached figure 1In the process flow shown, the materials are first mixed uniformly by the raw material mixer M1 according to the ratio of sec-butyl acetate: ethylene glycol: sodium ethylene glycol molar ratio = 3: 1: 0.02, and then preheated in the preheater E1 to 110°C, and then fed into the catalytic distillation tower T1 through the raw material feed port PL1, under the action of 15% sodium ethylene glycol / N-acetylpyrrolidone and a metal mesh composite catalyst system coated with ZSM-5 molecular sieve membrane The lower raw material undergoes transesterification catalytic reaction in the reaction section S2 and undergoes vapor-liquid mass transfer exchange to realize the process of continuous catalytic rectification.

[0053] The number of theoretical plates in the rectification section of the catalytic rectification tower is 6, the number of theoretical plates in the reaction section is 30, and the number of theoretical plates in the stripping section is 3. The op...

Embodiment 2

[0070] Attached figure 1 In the process flow shown, the materials are first mixed uniformly by the raw material mixer M1 according to the ratio of sec-butyl acetate: ethylene glycol: sodium ethylene glycol molar ratio = 4: 1: 0.03, and then preheated in the preheater E1 to 110°C, and then fed into the catalytic rectification tower T1 through the raw material feed port PL1, under the action of 15% sodium ethylene glycol / N-acetylpyrrolidone and the wire mesh catalytic system coated with ZSM-5 molecular sieve membrane The raw material undergoes transesterification catalytic reaction in the reaction section S2 and undergoes vapor-liquid mass transfer exchange to realize continuous catalytic rectification.

[0071] The number of theoretical plates in the rectification section of the catalytic rectification tower is 5, the number of theoretical plates in the reaction section is 25, and the number of theoretical plates in the stripping section is 3. Operating conditions of catalytic...

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Abstract

The invention relates to a method for preparing ethylene glycol diacetate and sec-butanol and a catalyst system and device used in the method. The method comprises the following steps: sec-butyl acetate and ethylene glycol are used as raw materials, in a reactor filled with a metal wire mesh filler having the surface coated with a ZSM-5 molecular sieve membrane, a reaction is carried out under thecatalytic action of a composite catalytic system sodium ethylene glycol/N-acetylpyrrolidone, and the ethylene glycol diacetate product is separated from the reaction products. According to the methodprovided by the invention, the conversion rate of the ethylene glycol is 100%, the yield of the ethylene glycol diacetate can be up to 99.5% or more, the yield of the sec-butanol is 100%, and the method has the advantages of a high conversion rate, a high yield, less side reactions, good product quality, simple separation and the like.

Description

technical field [0001] The invention relates to a method for synthesizing ethylene glycol diacetate and sec-butanol by transesterification using sec-butyl acetate and ethylene glycol as raw materials, a catalytic system and a preparation device thereof. Background technique [0002] Ethylene glycol diacetate (EGDA), also known as ethylene glycol diacetate, is a colorless liquid with a boiling point of 190.2°C. It is an efficient, safe, non-toxic and environmentally friendly organic solvent. Widely used in the pharmaceutical industry; organic ester curing agent for casting resins; also used as an excellent solvent for various organic resins, especially nitrocellulose, and raw materials for leather brighteners; used as nitro spray paint, printing ink, cellulose ester in paints and coatings , Fluorescent paint solvent. [0003] The traditional methods for the synthesis of ethylene glycol diacetate include acetate esterification, catalytic addition of ethylene oxide and acetic ...

Claims

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Application Information

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IPC IPC(8): C07C29/128C07C67/03C07C69/14C07C31/12B01J29/40B01J31/02B01D3/14B01D3/32B01J8/02
CPCC07C67/03C07C29/1285B01J29/40B01J31/0244B01D3/009B01D3/143B01D3/32B01J8/0242B01J8/0292C07C69/14C07C31/12Y02P20/52Y02P20/10
Inventor 谭仕荣秦艳龙刘良会李霁刘郁东
Owner HUNAN ZHONGCHUANG CHEM
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