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Method and device for purifying propionaldehyde

A propionaldehyde and reflux device technology, which is applied in the separation/purification of carbonyl compounds, can solve problems affecting product quality and dehydration difficulties, and achieve the effects of commercialization, utilization rate improvement, and recycling

Inactive Publication Date: 2014-10-08
南京荣欣化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, adopt 98% propionaldehyde hydrogenation to prepare n-propanol, can contain a certain amount of water in the product, dehydration is difficult, affects product quality

Method used

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  • Method and device for purifying propionaldehyde

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Embodiment 1

[0022] Example 1: A device for purifying propionaldehyde, comprising a pressurized rectification tower 1, a tower top condenser 2 and a reflux control device 3, the inlet of the pressurized rectification tower 1 is connected with the crude propionaldehyde inlet, and the pressurized rectification The top of the tower is provided with a steam outlet 11, the bottom of the tower is provided with a discharge port 12, the discharge port is provided with a valve 7, and the discharge port 12 is connected to the product tank 4 through a transport pipe, and a tower is arranged between the discharge port 12 and the product tank 4. Bottom condenser 6;

[0023] The steam outlet 11 is connected to the inlet of the tower top condenser 2 through a transport pipe, and the outlet of the tower top condenser 2 is connected to the inlet of the reflux device 3 through a transport pipe, and the outlet of the reflux device 3 is respectively connected to the raffinate tank 5, The rectification tower...

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Abstract

The invention discloses a method for purifying propionaldehyde. The method comprises the following steps: (1) delivering crude propionaldehyde into a pressurized rectifying tower, heating the pressurized rectifying tower to form the azeotropy of the propionaldehyde and water, and separating a gas-phase substance from a tower top; (2) condensing the gas-phase substance obtained from the tower top into a liquid-phase substance through a tower top condenser, and delivering into a reflux device; (3) detecting the propionaldehyde content of the reflux device, delivering liquid with the propionaldehyde content less than or equal to 93% into a raffinate pot, and delivering the liquid with the detected propionaldehyde content more than 93% back to the pressurized rectifying tower to rectify again; (4) repeating the step (1)-step (3) for 2-5 times, and then discharging the liquid inside the pressurized rectifying tower; and (5) feeding the discharged liquid into a refined propionaldehyde pot to obtain the propionaldehyde with purity higher than 99.9% in the refined propionaldehyde pot. According to the method, the azeotropy of the propionaldehyde and the water is formed in the pressurized rectifying tower, the moisture is gradually evaporated to retain the propionaldehyde with higher purity, and the propionaldehyde with the purity as high as 99.9% can be finally obtained through circulating rectification.

Description

technical field [0001] The invention relates to the field of purification of chemical products, in particular to a method and device for purification of high-purity propionaldehyde. Background technique [0002] Propionaldehyde can be used as a raw material for the production of propanol and propionic acid. At the same time, propionaldehyde is also widely used in the production of monomers of aliphatic hydrocarbons, polyoxides, amines, etc. It is also used as a processing aid for plastics and rubber, and it is also a raw material for medicine , Fuel additives, polymer chain transfer agents and emulsion stabilizers. [0003] Among the preparation methods of propionaldehyde, low-pressure oxo-synthesis method is the main method and development direction at present. The moisture content in propionaldehyde produced by low-pressure oxo-synthesis method is about 8~10%, while ordinary rectification method can only purify The mass fraction of propionaldehyde is about 98%. Therefore...

Claims

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Application Information

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IPC IPC(8): C07C47/02C07C45/78C07C45/84
CPCC07C45/84C07C45/78C07C47/02
Inventor 林毓勇贾露露李刚王涛汤雯
Owner 南京荣欣化工有限公司
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