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Continuous propionaldehyde production method and reaction system

A production method and chemical reaction technology, applied in the field of chemical synthesis, can solve problems such as slowing down the reaction speed, and achieve the effects of stable output, saving energy consumption of production processes, and optimizing structural design.

Pending Publication Date: 2020-05-15
JIANGSU NUOMENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the specifications of the Venturi injector, it will affect the rate of the hydroformylation reaction in the loop reactor, and the rate of the hydroformylation reaction affects the formation of the product, thereby affecting the concentration of the catalyst in the reaction solution, which has a negative effect on the hydroformylation reaction. rate, simply using a loop reactor for production, as the reaction progresses, the catalyst concentration decreases and the reaction rate gradually slows down

Method used

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  • Continuous propionaldehyde production method and reaction system
  • Continuous propionaldehyde production method and reaction system
  • Continuous propionaldehyde production method and reaction system

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In the loop reactor of 30L (reactor volume 30L), add Rh(acac)(CO) 2 and the propionaldehyde solution of TPP to the height of 50% of the liquid level of the reactor, the Rh metal content in the initial solution is 45ppm, and the molar ratio of TPP to Rh is 300. After sealing, feed ethylene and synthesis gas (volume ratio of ethylene, hydrogen and carbon monoxide 1:1.05:1) into the reactor to a system pressure of 1.0 MPa, turn on the circulation pump, and replace the air in the reactor six times. Regulate the reactor pressure to 0.4MPa by injecting ethylene and synthesis gas (volume ratio of ethylene, hydrogen and carbon monoxide: 1:1.05:1), raise the temperature to the reaction temperature of 85°C (heating time is about 1h), and immediately fill the mixed gas to the reaction pressure of 0.9MPa , which is recorded as the reaction start time. During the reaction process, the pressure of the reaction system is constant at 0.9MPa, and the volume ratio of ethylene, hydrogen ...

Embodiment 2

[0041] In the loop reactor of 30L (reactor volume 30L), add Rh(acac)(CO) 2 and the propionaldehyde solution of TPP to the height of 50% of the liquid level of the reactor, the Rh metal content in the initial solution is 45ppm, and the molar ratio of TPP to Rh is 300. After sealing, feed ethylene and synthesis gas (volume ratio of ethylene, hydrogen and carbon monoxide 1:1.05:1) into the reactor to a system pressure of 1.0 MPa, turn on the circulation pump, and replace the air in the reactor six times. Regulate the reactor pressure to 0.4MPa by injecting ethylene and synthesis gas (volume ratio of ethylene, hydrogen and carbon monoxide: 1:1.05:1), raise the temperature to the reaction temperature of 85°C (heating time is about 1h), and immediately fill the mixed gas to the reaction pressure of 0.9MPa , which is recorded as the reaction start time. During the reaction process, the pressure of the reaction system is constant at 0.9MPa, and the volume ratio of ethylene, hydrogen ...

Embodiment 3

[0045] In the loop reactor of 30L (reactor volume 30L), add Rh(acac)(CO) 2 and the propionaldehyde solution of TPP to the height of 50% of the liquid level of the reactor, the Rh metal content in the initial solution is 45ppm, and the molar ratio of TPP to Rh is 300. After sealing, feed ethylene and synthesis gas (volume ratio of ethylene, hydrogen and carbon monoxide 1:1.05:1) into the reactor to a system pressure of 1.0 MPa, turn on the circulation pump, and replace the air in the reactor six times. Regulate the reactor pressure to 0.4MPa by injecting ethylene and synthesis gas (volume ratio of ethylene, hydrogen and carbon monoxide: 1:1.05:1), raise the temperature to the reaction temperature of 85°C (heating time is about 1h), and immediately fill the mixed gas to the reaction pressure of 0.9MPa , which is recorded as the reaction start time. During the reaction process, the pressure of the reaction system is constant at 0.9MPa, and the volume ratio of ethylene, hydrogen ...

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Abstract

The invention discloses a continuous production method of propionaldehyde, wherein the continuous production method of propionaldehyde takes ethylene as a reaction raw material and triphenylphosphinecarbonyl rhodium as a catalyst for carbonyl synthesis to prepare propionaldehyde. According to the continuous production method of propionaldehyde, a loop reactor is adopted; in the reaction process,a solution in the loop reactor is continuously pumped out and divided into two paths, one path of the solution returns to the loop reactor through a heat exchanger, the other path of the solution enters an evaporation separator, propionaldehyde separated from the upper portion of the evaporation separator is stored after being cooled, and part of the undistilled solution in the evaporation separator returns to the loop reactor again. By utilizing the loop reactor, industrial continuous preparation of propionaldehyde can be effectively realized.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for preparing propionaldehyde through a continuous hydroformylation reaction process using a new type of reactor equipment—a loop reactor. Background technique [0002] Propionaldehyde is an important raw material for organic synthesis. It is mainly used in the production of chemical intermediates such as propionic acid, propanol and acetone oxime. It is widely used in industries such as rubber, paint, plastics, pharmaceutical spices and feed, and the market demand continues to increase. At present, the industrial production methods of propionaldehyde in the world mainly include ethylene hydroformylation synthesis method, propanol oxidation method, and propylene oxide isomerization. [0003] In the 1970s, triphenylphosphine carbonyl rhodium catalyst (HRh(CO)(PPh 3 ) 3 ) was first applied to the hydroformylation reaction of alkenes (E.A.V.Breweste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J10/00B01J4/00B01D3/00C07C45/50C07C47/02C07C45/82
CPCB01J19/0033B01J4/002B01J10/002B01D3/009C07C45/505C07C45/82B01J2219/00103C07C47/02
Inventor 梅华蒋流强於德伟
Owner JIANGSU NUOMENG CHEM
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