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

A technology of solid catalyst and crotonaldehyde, applied in molecular sieve catalysts, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of complex structure of condensation tower, unfavorable industrial production, and shortened service life and other issues, to achieve the effects of catalyst cost reduction, energy saving, and reduction of steam and electric energy consumption

Inactive Publication Date: 2017-07-14
赵明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: 1 g of silica gel catalyst was loaded into an 8 mm×400 mm quartz glass tube fixed-bed reactor, and the temperature was raised to 350° C. for half an hour under N2 purging at a flow rate of 10 mL / min. Next, acetaldehyde enters the reactor at a mass space velocity of 2 g / g·h for catalytic reaction. At the outlet of the reactor, the conversion of acetaldehyde was 43%, and the selectivity of crotonaldehyde was 94%. The specific experimental results are shown in Table 1.

Embodiment 2

[0030] The difference between embodiment 2 and embodiment 1 is that the catalyst is Al2O3 catalyst, and all the other reaction conditions are the same as embodiment 1. The specific experimental results are shown in Table 1.

Embodiment 3

[0032] The difference between Example 3 and Example 1 is that the catalyst is a ZSM-5 silica-alumina molecular sieve catalyst, and the rest of the reaction conditions are the same as in Example 1. The specific experimental results are shown in Table 1.

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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 ...

Claims

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Application Information

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IPC IPC(8): C07C45/74C07C47/21B01J21/08B01J21/04B01J29/40B01J21/06B01J21/14B01J23/20
CPCC07C45/74B01J21/04B01J21/066B01J21/08B01J21/14B01J23/20B01J29/40
Inventor 赵明
Owner 赵明
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