N-valeraldehyde preparation method and special venturi ejector

A technology of n-valeraldehyde and injectors, which is applied in the field of chemical production, can solve the problems of low product positive-to-isotropic ratio and conversion rate, and the influence of reaction process parameters on reaction conversion effects, etc., to achieve the best positive-to-isotropic ratio and conversion rate, and to promote Gas-liquid mass transfer process, the effect of reducing production costs

Active Publication Date: 2020-06-02
JIANGSU NUOMENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In patent 101679173A, although the speed of the circulation pump was adjusted, the diameter of the Venturi tube nozzle was optimized, and the reaction equipment was simply improved and optimized to a certain extent, although the reaction rate was accelerated and the energy consumption was reduced, but for The control of the positive-to-isotropic ratio and conversion rate of the final product valeraldehyde has not yet been involved, and the Venturi injector, the core component of the loop reactor, has not been optimized, so the low positive-to-isotropic ratio and conversion rate of the previously mentioned products have not been obtained. improve
At the same time, as the size of the reactor changes, the amount of catalyst and related reaction process parameters will eventually affect the reaction conversion effect.

Method used

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Examples

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Effect test

Embodiment 1

[0038] In the 5L loop reactor (reactor volume 5L), add a certain amount of toluene solvent 2650ml of rhodium dicarbonyl acetylacetonate and triphenylphosphine, the content of rhodium in the catalyst solution is 70 μg / g, and the molar ratio of TPP to Rh is 190. Feed synthesis gas (hydrogen to carbon monoxide volume ratio 1.1:1) into the reactor through the air inlet to a system pressure of 1MPa, turn on the circulation pump to make the liquid in the kettle flow slowly, vent, and repeat six times to replace the air in the loop reactor. Under pressure operation (synthesis gas pressure 0.6MPa), feed 700g of butene, raise the temperature to the preset reaction temperature of 100°C, and immediately fill in the mixed gas to the reaction pressure of 2.2MPa, adjust the circulation pump 4 until the flow rate reaches a certain value, which is recorded as the start of the reaction time. During the reaction process, the pressure of the synthesis gas connected to the reactor was controlled ...

Embodiment 2

[0042] In a 5L loop reactor (reactor volume 5L), add a certain amount of rhodium dicarbonyl acetylacetonate and triphenylphosphine toluene solvent 2650ml, catalyst rhodium content 60μg / g, TPP and Rh molar ratio 210. Feed synthesis gas (hydrogen to carbon monoxide volume ratio 1.1:1) into the reactor through the air inlet to a system pressure of 1MPa, turn on the circulation pump to make the liquid in the kettle flow slowly, vent, and repeat six times to replace the air in the loop reactor. Under pressure operation (synthesis gas pressure 0.6MPa), feed 700g of butene, raise the temperature to the preset reaction temperature of 105°C, and immediately fill in the mixed gas to the reaction pressure of 1.9MPa, adjust the circulation pump 4 until the flow rate reaches a certain value, which is recorded as the start of the reaction time. During the reaction process, the pressure of the synthesis gas connected to the reactor was controlled to be constant at 1.9MPa, and the temperature...

Embodiment 3

[0046] In a 5L loop reactor (reactor volume 5L), add a certain amount of toluene solvent 2650ml of rhodium dicarbonyl acetylacetonate and triphenylphosphine, catalyst rhodium content 80μg / g, TPP and Rh molar ratio 250. Feed synthesis gas (hydrogen to carbon monoxide volume ratio 1.1:1) into the reactor through the air inlet to a system pressure of 1MPa, turn on the circulation pump to make the liquid in the kettle flow slowly, vent, and repeat six times to replace the air in the loop reactor. Under pressure operation (synthesis gas pressure 0.6MPa), feed 700g of butene, raise the temperature to the preset reaction temperature of 95°C, and immediately fill in the mixed gas to the reaction pressure of 2.0MPa, adjust the circulation pump 4 until the flow rate reaches a certain value, which is recorded as the start of the reaction time. During the reaction process, the pressure of the synthesis gas connected to the reactor was controlled to be constant at 2.0MPa, and the temperatu...

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Abstract

The invention discloses an n-valeraldehyde preparation method and a special venturi ejector, and the n-valeraldehyde preparation method adopts a loop reactor to prepare n-valeraldehyde through butenehydroformylation reaction, wherein the ratio of the inner diameter of the opening of the inlet section of the venturi ejector to the inner diameter of a nozzle to the inner diameter of a closing-in opening of an air chamber to the length of the mixing section to the length of the diffusion section in the loop reactor is 38: (1.5-5): (2-8): (10-50): (600-1700), and the opening angle of the diffusion section is 12-38 degrees. According to the n-valeraldehyde preparation method, butene, hydrogen and carbon monoxide are used as raw materials, toluene is used as a solvent, triphenylphosphine (TPP)and acetylacetonatodicarbonyl rhodium are used as catalysts, and the liquid linear speed at the nozzle of the venturi ejector is controlled to be 50-110 m/s in the reaction process. Through the designof a loop reactor, the normal-to-isomerism ratio of the valeraldehyde product can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method for preparing valeraldehyde by hydroformylation using a new type of reactor equipment—a loop reactor. Background technique [0002] Valeraldehyde is an important intermediate in organic synthesis, which can be used to prepare n-valeraldehyde, n-pentanol, n-valeric acid, n-pentylamine and other products. Alcohol (2-PH) raw material, 2-PH can be further synthesized environmentally friendly novel plasticizer bis(2-propylheptyl) phthalate (DPHP). [0003] The main production methods of valeraldehyde include dichromate oxidation, biological enzyme catalysis and hydroformylation reaction. Among them, the dichromate oxidation method has the disadvantages that the price of the raw material amyl alcohol is relatively expensive, and the dichromate is poisonous and harmful. Bioenzyme catalysis is currently in the exploratory stage. Neither of these proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/50C07C47/02B01F5/04
CPCC07C45/505B01F25/31251B01F25/3125B01F25/312C07C47/02
Inventor 梅华蒋流强朱林秦振宝
Owner JIANGSU NUOMENG CHEM
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