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Methyl acrylate synthesis method, catalyst and application

A technology of methyl acrylate and catalyst, which is applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of short catalytic activity retention time, poor methyl acrylate yield and selectivity, etc. Improve product selectivity, good economic and social benefits, and improve selectivity

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the yield and selectivity of methyl acrylate are not good in the industrial method of synthesizing methyl acrylate by aldol synthesis reaction, and the problem that the catalytic activity is kept for a short period of time provides a method for synthesizing methyl acrylate Methods, catalysts and applications, namely:

Method used

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  • Methyl acrylate synthesis method, catalyst and application
  • Methyl acrylate synthesis method, catalyst and application

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preparation example Construction

[0068] The preparation method of solid catalyst

[0069] The preparation method of solid base catalyst of the present invention comprises:

[0070] (i) providing a precursor salt solution containing a catalytic amount of an alkali metal element and 50 to 80 parts of a carrier;

[0071] (ii) the solution of the step (i) is mixed with a carrier to obtain a mixture;

[0072] (iii) calcining the mixture in step (ii), preferably at a calcining temperature of 400-600° C., to obtain the solid catalyst.

[0073] The precursor salt is preferably at least one of nitrate, carbonate and acetate.

[0074] Preferably, the alkali metal includes at least one selected from the group consisting of K, Rb and Cs.

[0075] In order to obtain a catalyst with better strength, the catalyst preparation preferably has a drying step after step (ii) and before step (iii). The specific drying process conditions can be reasonably determined by those skilled in the art without having to pay creative e...

Embodiment 1

[0085] 1. Catalyst preparation

[0086] Get 100 grams of cesium carbonate aqueous solution (containing cesium carbonate with Cs 2 O is 12 grams); mix with 60 grams of silica microspheres (microsphere diameter 2.5mm, BET method average pore diameter 22nm, BET method pore volume 1.1ml / g), leave standstill for 24 hours, then vacuum at 50°C Dry for 24 hours, and bake at 500° C. in an air atmosphere for 5 hours to obtain a finished catalyst.

[0087] 2. On-line reduction activation of catalyst and synthesis of methyl acrylate

[0088] Get each 6 grams of three parts of catalyzers, pack respectively in the fixed-bed reactor (inner diameter 16mm long 1500mm) of 3 serial connections, use N 2 After three replacements, the temperature of the three reactors was raised to 400 °C, and N 2 , the flow rate is 1000mL / min, the pressure is 0.08MPa, keep for 12 hours, and the activation is completed.

[0089] The temperature of the three reactors was lowered to 300°C, the pressure was adjust...

Embodiment 2

[0091] 1. Catalyst preparation

[0092] Get 100 grams of cesium carbonate aqueous solution (containing cesium carbonate with Cs 2 O is 12 grams); mix with 60 grams of silica microspheres (microsphere diameter 2.5mm, BET method average pore diameter 22nm, BET method pore volume 1.1ml / g), leave standstill for 24 hours, then vacuum at 50°C Dry for 24 hours, and bake at 500° C. in an air atmosphere for 5 hours to obtain a finished catalyst.

[0093] 2. On-line reduction activation of catalyst and synthesis of methyl acrylate

[0094] Get each 3 grams of six parts of catalyzers, pack respectively in 6 fixed-bed reactors (inside diameter 16mm long 1500mm) of packing into, use N 2 After three replacements, the temperature of the six reactors was raised to 400°C, and N 2 , the flow rate is 1000mL / min, the pressure is 0.08MPa, keep for 12 hours, and the activation is completed.

[0095] The temperature of the 6 reactors was lowered to 300°C, the pressure was adjusted to 0.5MPa, and...

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Abstract

The methyl acrylate synthesis method comprises the steps that under the action of a catalyst, methyl acetate and an aldehyde source are subjected to an aldol synthesis reaction to obtain methyl acrylate, and the aldehyde source is fed in a segmented mode. The invention also provides a preparation method of the solid base catalyst for synthesis of methyl acrylate. The preparation method comprises the following steps: mixing a catalytic amount of alkali metal element precursor salt water solution with the carrier; and roasting to obtain the solid base catalyst. Wherein the alkali metal comprises a Group IA alkali metal element, preferably selected from K, Rb, Cs or a combination thereof; the carrier has an average pore size of 2-50nm by a BET method and a pore volume of 0.2-2ml / g by the BET method. The method is simple, easy to implement and suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a method for synthesizing methyl acrylate, a catalyst and an application. Background technique [0002] The preparation methods of acrylic acid and its esters mainly include propylene oxidation method, acrylonitrile hydrolysis method, ketene method, propane oxidation method and methyl formate method. However, these methods have disadvantages such as serious pollution, high energy consumption, and low product yield. Therefore, it is of great significance to develop green and efficient new production processes. [0003] Lucite Company has proposed a mature α-MMA process, which uses methyl methacrylate from methyl propionate and formaldehyde. But the process route of the Lucite company is not suitable for my country's national conditions. my country's national conditions are a large excess capacity of methyl acetate. However, Lucite's process route is to synthesize methyl methacrylate r...

Claims

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Application Information

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IPC IPC(8): C07C67/343C07C69/54B01J23/04B01J35/10B01J32/00B01J21/08B01J37/16
CPCC07C67/343B01J23/04B01J21/08B01J37/16B01J35/612B01J35/613B01J35/638B01J35/635B01J35/633C07C69/54
Inventor 刘晓曦王海之余强刘仲能
Owner CHINA PETROLEUM & CHEM CORP
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