New process for one-step synthesis of crotonaldehyde from acetaldehyde, and solid catalyst thereof

Abstract

The invention discloses a new process for synthesizing crotonaldehyde from acetaldehyde in one step and a solid catalyst thereof. The new process of the present invention refers to a process in which acetaldehyde is passed through a reactor equipped with a heterogeneous solid catalyst, catalyzed at a certain temperature, and directly condensed and dehydrated in one step to obtain crotonaldehyde. The invention also discloses the components of the solid catalyst used, the solid catalyst includes silicon oxide, aluminum oxide, silicon-alumina molecular sieve catalyst, or, any one of the first three is supported on any one of magnesium, zirconium, titanium, cerium, tantalum , hafnium, scandium and yttrium and other transition metal oxide catalysts. The new process for synthesizing crotonaldehyde described in the present invention is simple in operation, easy to scale up, environmentally friendly, low in energy consumption, high in catalytic activity of the catalyst, and high in utilization rate of raw materials. It is a green process for sustainable synthesis of crotonin, and has good industrial Application prospects.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a new process for one-step synthesis of crotonaldehyde from acetaldehyde and a solid catalyst thereof. Background technique [0002] Crotonaldehyde, also known as crotonaldehyde, is a colorless or light yellow liquid. It is an important intermediate in organic synthesis. It is industrially used to manufacture butyraldehyde, food preservative sorbic acid, synthetic resins, dyes, pesticides, Foaming agent for beneficiation, rubber antioxidant, etc. [0003] In the existing production technology of crotonaldehyde, the method disclosed in the patent application is a two-step method for synthesizing crotonaldehyde from acetaldehyde. The process flow is mainly that acetaldehyde first generates 3-hydroxybutyraldehyde under the action of a homogeneous basic catalyst, and then 3-hydroxybutyraldehyde is dehydrated under acidic conditions to generate crotonaldehyde. "Crotonal ...

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Problems solved by technology

[0004] In the above-mentioned method, no matter alkalis such as inorganic sodium hydroxide or organic tetramethylammonium hydroxide are used as alkaline catalysts to catalyze the condensation of acetaldehyde, a large amount of inorganic or organic alkaline wastewater will be produced, and the wastewater needs to go through complicated processes before being discharged. Only after treatment can it be discharged, which is inconsistent with the concept of environmental protection; the existence of homogeneous alkaline substances will seriously corrode the equipment and shorten the service life, which is not conducive to industrial production

In addition, the two-step process is complicated, the structure of the condensation tower is complicated and the cost is high, the product is complicated, and the separation cost is high

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