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Method for continuously producing unsaturated aldehyde compound

An aldehyde compound and unsaturated technology, which is applied in the field of continuous production of unsaturated aldehyde compounds, can solve the problems of reducing product yield and increasing process complexity, and achieves the effects of improving product yield, improving raw material utilization rate and reducing side reactions.

Active Publication Date: 2011-06-15
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This production process has improved in terms of energy utilization and product quality, but it needs to be washed to improve product quality, which increases the complexity of the process
Because the above-mentioned processes all use alkaline aqueous solution as a catalyst, in the relatively high-temperature distillation and separation process, the product is mixed with the alkaline catalyst aqueous solution, which is conducive to the occurrence of alkali-catalyzed Cannizzaro reaction and reduces the product yield.

Method used

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  • Method for continuously producing unsaturated aldehyde compound
  • Method for continuously producing unsaturated aldehyde compound
  • Method for continuously producing unsaturated aldehyde compound

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Effect test

Embodiment 1

[0041] A 2% NaOH aqueous solution is used as a catalyst in a tank-type stirred reactor. The condensation reaction temperature is 120°C, and the reaction pressure is 0.4MPa. The process flow is attached Figure 4 Shown: the raw material n-butyraldehyde enters the tank-type stirred reactor A through the pipeline b, and undergoes condensation reaction with the alkali catalyst (2% NaOH) solution at a ratio of 1.5:1. Then the reaction mixture is cooled down to 40°C, and enters the chromatograph B through the pipeline c for static separation. The upper organic phase is octenal containing saturated water and a small amount of unreacted n-butyraldehyde material, and the lower water phase is an aqueous solution containing NaOH catalyst. Part of the water phase is discharged to the wastewater treatment system through the pipeline f, and the remaining water phase is circulated back to the tank-type stirred reactor 1 through the pipeline e for recycling. Concentration is 10% fresh NaOH...

Embodiment 2

[0045] Embodiment 2 technological process sees figure 1 : N-butyraldehyde enters the fixed bed aldehyde condensation reactor 1 at a flow rate of 5000Kg / h for adiabatic condensation reaction, the reaction temperature at the inlet of the reactor is 150°C, the reaction pressure is 0.7MPa, the catalyst is acidic strip hydrogen ZSM-5 zeolite, alumina As a carrier (95% of ZSM-5 zeolite and 5% of alumina in the catalyst), the liquid hourly space velocity is 1h -1 . The reaction liquid enters the unsaturated aldehyde distillation tower 2 from the tower kettle. The unsaturated aldehyde distillation column is a packed column with Pall ring packing and 10 equivalent trays. The operating pressure at the top of the tower is 0.1Mpa, the operating temperature at the top of the tower is 99°C, and the discharge temperature at the bottom of the unsaturated aldehyde distillation tower is 164°C. The top material of the unsaturated aldehyde distillation tower 2 enters the aldehyde recovery towe...

Embodiment 3

[0049] Reaction solution hourly space velocity 1.4h -1 , unsaturated aldehyde distillation tower 2 tower top operating pressure 0.12MPa, tower top operating temperature 96 ℃, tower bottom discharge temperature 172 ℃, other process conditions are the same as embodiment 2. The main logistics flow and composition are shown in Table 3.

[0050] Table 3. Main material flow table of solid catalyst catalyzed aldehyde condensation process

[0051]

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Abstract

The invention provides a method for continuously producing an unsaturated aldehyde compound, which comprises the following steps of: performing aldol condensation reaction and dehydration reaction on an aldehyde compound of general formula (I) in an aldehyde condensation reactor (1) under the catalytic action of an acidic zeolite catalyst to continuously prepare the alpha, beta-unsaturated aldehyde compound; after the reaction solution is separated with the acidic zeolite, performing distillation through an unsaturated aldehyde distillation tower (2) and an aldehyde recovery tower (3) in turnto obtain an unsaturated product, water generated by the reaction and un-reacted aldehyde raw materials respectively; and returning the un-reacted aldehyde raw materials to the aldehyde condensation reactor (1) to recycle. Compared with the traditional liquid alkali catalytic production process, the method is low in equipment corrosion and low in wastewater discharge and environmentally-friendly due to the adoption of the solid catalyst; and in the high-temperature refining process, the contact of the product and the catalyst can be avoided, so unnecessary side reaction is reduced, and raw material utilization rate and product yield are improved.

Description

technical field [0001] The invention relates to a method for continuously producing unsaturated aldehyde compounds through aldol condensation and dehydration reactions of aldehyde compounds; in particular, it relates to a method for continuously producing unsaturated aldehyde compounds through self-condensation and dehydration reactions of aldehyde compounds. Background technique [0002] Two ketone compounds (aldehyde or ketone) undergo an aldol condensation reaction under the action of an acid or basic catalyst to obtain a hydroxy aldehyde or ketone compound. Then, this reaction product is further dehydrated to generate α, β-unsaturated aldehyde compounds, which is an important reaction carried out on a large scale in industry. This unsaturated aldehyde compound is an important chemical intermediate, and the saturated aldehyde or alcohol compound obtained by hydrogenation is the raw material for preparing detergent, plasticizer, desiccant, carboxylic acid and other chemica...

Claims

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Application Information

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IPC IPC(8): C07C45/74C07C47/21C07C47/232
Inventor 陈建伟蒋文张佶璘
Owner SHANGHAI HUAYI ENERGY CHEM
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