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Annular multilayer sleeve membrane reactor and method for producing methyl propiolate through same

A multi-layer casing and membrane reactor technology, which is applied in chemical instruments and methods, preparation of carboxylic acid esters, preparation of organic compounds, etc., can solve the problem of uneven distribution of air for inhibiting polymerization, low conversion rate of esterification reaction, and catalyst utilization. Low efficiency and other problems, to achieve the effect of improving conversion rate and selectivity, reducing corrosion, and reducing energy consumption

Active Publication Date: 2015-12-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several problems in adopting solid catalyst to produce and prepare (meth)acrylic acid esters equipment, the first, adopting fixed bed equipment can't realize continuous dehydration, thereby cause the conversion rate of esterification reaction to be low; Second, solid catalyst does not flow and makes material Channeling is easy to form, resulting in low catalyst utilization efficiency and poor mass transfer effect; third, (meth)acrylic acid contains unsaturated double bonds, which is easy to produce polymers. Generally, the polymerization inhibition air of esterification equipment is from a single point or several Point-to-point addition, the polymerization-inhibiting air is unevenly distributed in the reaction system; fourth, the esterification reaction using a solid catalyst, alcohols are adsorbed on the surface of the catalyst to generate ether impurities

Method used

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  • Annular multilayer sleeve membrane reactor and method for producing methyl propiolate through same
  • Annular multilayer sleeve membrane reactor and method for producing methyl propiolate through same
  • Annular multilayer sleeve membrane reactor and method for producing methyl propiolate through same

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Experimental program
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Effect test

Embodiment 1

[0037] The esterification reaction of acrylic acid and methanol is carried out by using the annular multi-layer sleeve reactor provided by the invention to generate methyl acrylate. The reactor 7 is placed horizontally, the length of the radial section is 0.92m, and the diameters of the three-layer casing are 0.1m, 0.48m, and 0.6m from the inside to the outside. The Amberlyst25wet cationic resin catalyst produced by Dow Chemical is circulated inside the middle membrane sleeve 13, and the mass space velocity of acrylic acid is 3.65h -1 . Mix acrylic acid and methanol with a molar ratio of 1.12:1 uniformly through the static mixer 3, transport them to the preheater 5 at a speed of 10kg / h through the raw material pump to preheat to 75°C, and then enter the middle membrane casing 13 of the reactor 7 Inside. The inner pressure of the inner membrane casing 11 is 30KPa, the inner pressure of the middle membrane casing 13 is 300KPa, and the outer casing 12 is fed with air preheated ...

Embodiment 2

[0041] The esterification reaction of acrylic acid and ethanol is carried out by using the annular multi-layer sleeve reactor provided by the invention to generate ethyl acrylate. The reactor 7 is placed horizontally, the length of the radial section is 0.92m, and the diameters of the three-layer casing are 0.1m, 0.6m, and 1m from the inside to the outside. Amberlyst25wet cationic resin catalyst circulates inside the membrane sleeve 13, and the mass space velocity of acrylic acid is 3.65h -1 . Mix acrylic acid and ethanol with a molar ratio of 1.10:1 uniformly through the static mixer 3, transport them to the preheater 5 at a speed of 10kg / h through the raw material pump to preheat to 80°C, and then enter the middle film jacket 13 tube of the reactor 7 . The inner pressure of the inner membrane casing 11 is 40KPa, the inner pressure of the middle membrane casing 13 is 150KPa, and the outer casing 12 is fed with air preheated to 80°C with a pressure of 160kPa. The residence ...

Embodiment 3

[0045] The esterification reaction of acrylic acid and n-butanol is carried out by using the annular multi-layer sleeve reactor provided by the invention to generate butyl acrylate. The reactor 7 is placed horizontally, the length of the radial section is 0.92m, and the diameters of the three-layer casing are 0.1m, 0.3m, and 0.7m from the inside to the outside. The Amberlyst39wet cationic resin catalyst produced by Dow is circulated inside the middle membrane sleeve 13, and the mass space velocity of acrylic acid is 3.65h -1 . Mix acrylic acid and butanol with a molar ratio of 1:1.20 uniformly through the static mixer 3, transport them to the preheater 5 through the raw material pump at a speed of 10kg / h, preheat to 95°C, and then enter the middle membrane in the reactor 7 Inside the casing 13. The inner pressure of the inner membrane casing 11 is 20KPa, the inner pressure of the middle membrane casing 13 is 350KPa, and the outer casing is fed with air preheated to 95°C with...

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Abstract

The invention discloses an annular multilayer sleeve membrane reactor. The reactor adopts an annular three-layer sleeve structure as the main body, and comprises an inner membrane sleeve, a middle membrane sleeve and an outer sleeve which are coaxially arranged from the inner part to the outer part, wherein exteriors of the inner membrane sleeve and the middle membrane sleeve are fixed and supported through supporting networks; a water vapor outlet is formed in the inner membrane sleeve; a material inlet and a material outlet are formed in the middle membrane sleeve; an air inlet is formed in the outer sleeve; a mixing component is arranged in the cavity of the middle membrane sleeve; a separating network is mounted in at the outlet of the middle membrane sleeve; a one-way valve is mounted between the material inlet and the material outlet. Methyl propiolate produced by the reactor can realize continuous removal of produced water during esterification reaction of the methyl propiolate, and improve the reaction conversion rate and selectivity, and meanwhile reduces the generationproduces of polymer and ether impurities.

Description

technical field [0001] The invention relates to a ring-type multi-layer casing membrane reactor and a method for producing (meth)acrylic acid ester through the esterification reaction of (meth)acrylic acid and C1-C4 alcohol by using the reactor. Background technique [0002] (Meth)acrylate is a bulk chemical raw material. The (meth)acrylate resin formed by self-polymerization or copolymerization is widely used in the production of coatings, adhesives, plexiglass, textiles, etc. (Meth)acrylic acid esters can be obtained by esterification reaction of (meth)acrylic acid and alcohol catalyzed by acid catalysts. [0003] The esterification reaction is a reversible reaction, so the conversion rate can only be below an equilibrium value, which depends on the equilibrium constant. To increase conversion, a method may involve a large excess of a starting alcohol or acid. This method often leads to an increase in by-products, a decrease in selectivity, and also brings certain diffic...

Claims

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Application Information

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IPC IPC(8): B01J8/08C07C69/653C07C67/08
Inventor 葛飞徐彦龙董诚陈俊张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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