Process for preparing benzaldehyde by methylbenzene liquid phase oxidation

A liquid-phase oxidation and benzaldehyde technology, which is applied in the preparation of carbon-based compounds, the preparation of organic compounds, and the separation/purification of carbonyl compounds, etc., can solve the problem that tolualdehyde is not suitable for use, the output and yield are low, and the demand is not met. It is easy to obtain and cheap, less by-products, and enhance the mixing effect.

CN107032969AInactive Publication Date: 2017-08-11QINZHOU UNIV
4 Cites 4 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-08-11
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a process for preparing benzaldehyde by methylbenzene liquid phase oxidation. The process comprises a step 1) of reaction section; a step 2) of separation section; wherein final main product benzaldehyde is extracted from a tower top of a rectifying tower 3, the purity reaches 97% or above, and a small number of other mixed ingredients flow out of a tower reactor of the rectifying tower; and a step 3) of tail gas treatment section.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a process for preparing benzaldehyde by liquid-phase oxidation of toluene. Background technique

[0002] The molecular formula of benzaldehyde is C 7 h 6 O, the color is generally yellow or colorless, it is an oily liquid, it is highly volatile, has high refraction, and the smell is bitter almond, often called bitter almond oil, flammable, It has an aromatic smell when burned. Benzaldehyde is an important aromatic aldehyde in industry and exists in nature in the form of glucose. It is miscible with many organic solvents such as ethanol, ether, benzene and chloroform. Benzaldehyde is non-toxic, and its vapor is very mild and has the function of anesthesia. Benzaldehyde is easily oxidized to benzoic acid by oxygen in the air, and it can accelerate the self-oxidation of benzaldehyde in alkaline environment. Inhibitors such as phenols, cyanide, sulfur, iodine ...

Examples

Embodiment

[0037] A kind of technology that benzaldehyde is prepared by liquid-phase oxidation of toluene comprises following processing steps:

[0038] 1) Reaction section:

[0039] The raw material toluene enters the heater through the pump to heat up and then enters the oxidation reaction tower, and the oxygen enters the oxidation reaction tower after being compressed by the compressor to carry out the air liquid phase oxidation reaction of toluene;

[0040] 2) Separation section: the material components from the oxidation reaction tower flow into the flash tank, and part of the light components are flashed out from the top of the flasher. The light components include partially reacted water and unreacted toluene and oxygen;

[0041] Other components then flow out from the bottom of the flasher into the rectification tower 1 for separation. The rectification tower 1 is a rectification tower with 17 trays, fed from the 7th tray, and the rectification tower 1 top The separated componen...