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Method for preparing 2-alkoxy propylene

A technology of alkoxypropene and dialkoxypropane, which is applied in the field of preparation of 2-alkoxypropene, can solve the problems of difficult separation, increase, and many side reactions, achieve high conversion rate of cracking reaction, reduce three wastes, highly selective effect

Active Publication Date: 2020-05-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the whole, the advantages of the gas phase cracking method are that the reaction conversion rate is high and the operation is simple; the disadvantage is that the reaction requires high temperature, often requiring a temperature above 300°C, resulting in many side reactions, difficult separation, and increased requirements for equipment.

Method used

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  • Method for preparing 2-alkoxy propylene
  • Method for preparing 2-alkoxy propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In a tower reactor with a length of 1m and a diameter of 0.02m, catalyst A is filled from the bottom of the tower to 1 / 3, with a filling mass of 60g, and 1 / 3 to 2 / 3 is filled with catalyst A and alkali at a mass ratio of 1:1 60g of the mixture of the mixed carrier, 2 / 3 to the top of the tower is filled with 60g of basic carrier, and 180g of catalyst and carrier are filled together. The raw material 2,2-dimethoxypropane is fed from the bottom of the tower through a flow meter at a flow rate of 90g / h. The temperature at the bottom of the tower is controlled at 280°C and the pressure is 0.2MPaG. The gas collected at the top of the tower is cooled and rectified , 59.81 g / h (reaction conversion rate 98.25%, selectivity 97.70%, yield 95.99%) product 2-methoxypropene was collected. The reaction was carried out continuously for 3000h, and no catalyst deactivation was found.

Embodiment 2

[0043] In a tower reactor with a length of 1m and a diameter of 0.02m, catalyst B is filled from the bottom of the tower to 1 / 3, the filling mass is 40g, and 1 / 3 to 2 / 3 is filled with catalyst B and The mixture of basic carriers is packed, the filling mass is 100g, the basic carrier is filled from 2 / 3 to the top of the tower, the filling mass is 40g, and the catalyst and carrier are filled with 180g. The raw material 2,2-dimethoxypropane is fed from the bottom of the tower at a flow rate of 70g / h through a flow meter. The temperature at the bottom of the tower is controlled at 270°C and the pressure is 0.3MPaG. The gas collected at the top of the tower is cooled and rectified , Collected 45.29g / h (reaction conversion rate 97.19%, selectivity 96.15%, yield 93.45%) product 2-methoxypropene. The reaction was carried out continuously for 3500h, and no catalyst deactivation was found.

Embodiment 3

[0045] In a tower reactor with a length of 1m and a diameter of 0.02m, catalyst A is filled from the bottom of the tower to 1 / 3, the filling mass is 60g, and 1 / 3 to 2 / 3 is filled with catalyst A and The mixture of basic carriers is packed, the filling mass is 60g, the basic carrier is filled from 2 / 3 to the top of the tower, the filling mass is 60g, and the catalyst and carrier are filled with 180g. The raw material 2,2-diethoxypropane is fed from the bottom of the tower at a flow rate of 90g / h through a flow meter. The temperature at the bottom of the tower is controlled at 300°C and the pressure is 0.25MPaG. The gas collected at the top of the tower is cooled and rectified , collected 53.74g / h (reaction conversion rate 99.46%, selectivity 92.15%, yield 91.65%) product 2-ethoxypropene. The reaction was carried out continuously for 3000h, and no catalyst deactivation was found.

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Abstract

The invention relates to a method for preparing 2-alkoxy propylene. The method comprises the following steps of: in the presence of a modified Y-type molecular sieve catalyst and an alkaline carrier,carrying out a cracking reaction on a raw material that is 2,2-dialkoxy propane in a tower reactor; collecting the 2-alkoxy propylene at the tower top of the tower reactor. The filling mode of the modified Y-type molecular sieve catalyst and the alkaline carrier in the tower reactor is as follows: the tower reactor is equally divided into three sections according to the length, and filled with themodified Y-type molecular sieve catalyst, a mixture of the modified Y-type molecular sieve catalyst and the alkaline carrier, and the alkaline carrier respectively from bottom to top. The method hasthe advantages of high cracking reaction conversion rate, high selectivity and few byproducts; the service life of the catalyst is long, and the catalytic activity is not obviously reduced after 3000hours or more; in addition, the catalyst can be regenerated, so that the consumption of the catalyst is reduced, the generation of three wastes is reduced, and the method is a green and environment-friendly new method for synthesizing the 2-alkoxy propylene.

Description

technical field [0001] The invention relates to a method for preparing 2-alkoxypropene. Specifically, a modified acidic Y-type molecular sieve and a basic carrier are mixed as a catalyst, and 2,2-dialkoxypropane is used as a raw material. Carrying out cracking reaction under certain temperature and pressure to synthesize 2-alkoxypropene is a new green method. Background technique [0002] 2-Alkoxypropene is an important chemical raw material. Its chemical properties are very active. This is because its molecule contains two functional groups: a double bond and an ether bond, so that it has both the general properties of olefins and ethers. 2-Alkoxypropene has a wide range of uses, and is often used as a solvent and auxiliary agent in the coating, textile and leather industries; it is also commonly used as a key intermediate in the synthesis of medicine, food and feed; Protecting agent for group and amino group, and used in sugar chemistry as protecting agent, cyclizing agen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/18C07C43/15B01J29/08B01J31/26B01J23/04
CPCC07C41/18B01J29/084B01J23/04B01J31/26B01J2229/37B01J2229/42C07C43/15Y02P20/584
Inventor 杨宗龙张涛吕英东林龙刘英瑞郭劲资张旭程晓波王延斌朱龙龙李莉宋军伟翟文超黎源
Owner WANHUA CHEM GRP CO LTD
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