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Technical method for producing propyl aldehyde through hydroformylation of ethylene

A technology of ethylene hydroformylation and propionaldehyde, which is applied in the field of treatment of propionaldehyde rectification still liquid, which can solve the problems of increasing the difficulty of impurity polymer treatment, increasing the energy consumption load of rectification kettle, affecting the quality of rectification propionaldehyde, etc. problems, to achieve the effect of improving the process grade, reducing energy consumption, and simple process

Inactive Publication Date: 2012-02-01
南京荣欣化工有限公司
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  • Abstract
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Problems solved by technology

[0008] During rectification, there will be a small amount of about 2% water and propionaldehyde azeotrope, and a large amount of water and separated impurity polymers will remain at the bottom of the kettle. Due to the presence of impurity polymers, the raffinate cannot directly return to the front end for reaction system, also due to the presence of water, the amount of residual liquid is greatly increased, which also increases the difficulty of handling impurity polymers and increases environmental risks
[0009] At the same time, because the water cannot be recovered from the rectification part in time, in order to ensure the normal progress of the reaction, deionized water must be continuously prepared and added to the system, and because the water and impurities cannot be discharged from the rectification tank in time, the energy consumption load of the rectification tank is caused. Increased and continuously enriched impurities also affect the quality of rectified propionaldehyde

Method used

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  • Technical method for producing propyl aldehyde through hydroformylation of ethylene
  • Technical method for producing propyl aldehyde through hydroformylation of ethylene
  • Technical method for producing propyl aldehyde through hydroformylation of ethylene

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 , feed gas (ethylene, CO and H 2 mixture) into the reactor, under the action of a water-soluble rhodium-phosphine complex catalyst, propionaldehyde is generated, the crude propionaldehyde is heated to 45-50°C by a heater, and then sent to the rectification tower, and propionaldehyde is discharged from the top of the tower at a temperature of 48°C , the temperature of the tower kettle is 85 ~ 125 ℃, and the kettle liquid reaches the recycling process.

[0033] Such as figure 2 , the still liquid from the propionaldehyde rectification tower is 90°C, after being coarsely filtered by the filter screen of filter 1, after settling in the buffer tank 2, it is cooled to 10°C through the cooler 3, the water content in the still liquid is 90%, and the water content of 20 nm is selected. Aperture membrane tube, 0.38 MPa pressure, measured permeation flux after membrane separator 4 is 1620 kg / m 2 h, the water content of the permeate is 98%, the water content of...

Embodiment 2

[0035] This practical example is the same as Example 1, the difference is that the rectification still liquid is cooled to 45 ° C, the water content in the still liquid is 64%, a 200 nm aperture membrane tube is selected, and the pressure is 0.1 MPa. After membrane separation, the side part is concentrated The membrane is circulated, and a small part is taken out to the waste liquid tank 6 to remove impurity components. Water molecules pass through the ceramic membrane depermeate collection tank 5 and are pumped to the reactor. The measured permeation flux is 2220 kg / m 2 h, the water content of the permeate is 96.5%, the measured water content of the concentrated side is 7%, and the calculated water recovery rate is 96%.

Embodiment 3

[0037] This practical example is the same as Example 1, except that the rectification still liquid is cooled to 60°C, the water content in the still liquid is 42%, a 50 nm aperture membrane tube is selected, and the pressure is 0.6 MPa. After membrane separation, the side part is concentrated The membrane is circulated, and a small part is taken out to the waste liquid tank 6 to remove impurity components. Water molecules pass through the ceramic membrane depermeate collection tank 5 and are pumped to the reactor. The measured permeation flux is 1680 kg / m 2 h, the water content of the permeate is 97%, the water content of the concentrated side is 4%, and the calculated water recovery rate is 95%.

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Abstract

The invention discloses a technical method for producing propyl aldehyde through hydroformylation of ethylene and particularly relates to a method for processing a propyl aldehyde rectifying still solution. The method comprises the following steps of: (1), reacting ethylene with CO and H2 under the action of a soluble rhodium-phosphine complex catalyst to generate propyl aldehyde, obtaining a propyl aldehyde product on the tower top of a rectifying tower, and treating the tower solution with a still solution recovery technology; (2), in the recovery treatment technology, separating the rectifying still solution through a membrane separator, returning clear solution at a permeation side to a reactor and discharging materials at a concentrating side to a waste solution tank. The technical method has the advantages of simple technology and simpleness for operation, and but more, realizes water recovery and reduces the discharge of waste solution.

Description

technical field [0001] The invention relates to a process for producing propionaldehyde by hydroformylation of ethylene, in particular to a method for treating propionaldehyde rectification still liquid. Background technique [0002] Propionaldehyde is an important chemical product and chemical raw material. It is mainly used in the production of chemical intermediates such as propionic acid, propanol, trimethylolethane and acetone oxime. Wide range of uses. At present, the industrial production methods mainly include oxo synthesis method, propanol oxidation method, propylene oxide isomerization method, acrolein hydrogenation method and by-product method. Among them, the oxo synthesis method is the main method of production at present. [0003] The oxo synthesis method, also known as ethylene hydroformylation method, uses ethylene, carbon monoxide, and hydrogen as raw materials, and uses cobalt and rhodium phosphine complexes as catalysts. The main features of this method ...

Claims

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Application Information

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IPC IPC(8): C07C47/02C07C45/50C07C45/78B01D61/00
Inventor 林毓勇杨秀全王海霞徐彬彬李刚
Owner 南京荣欣化工有限公司
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