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Methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether, modification method and application

A methyl acetate, molecular sieve technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as catalyst activity and selectivity reduction, and achieve improved selectivity, reduced production costs, and high selectivity. sexual effect

Inactive Publication Date: 2018-06-15
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem solved by the present invention is: to provide a modification method of a molecular sieve catalyst for the carbonylation of dimethyl ether to produce methyl acetate, and to solve the problem in the prior art that the activity and selectivity of the catalyst decrease with the increase of the reaction temperature

Method used

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  • Methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether, modification method and application
  • Methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether, modification method and application
  • Methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether, modification method and application

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Embodiment 1

[0039] The present embodiment provides the method for modifying the dimethyl ether carbonylation to produce methyl acetate molecular sieve catalyst of the present invention, and the specific steps are as follows:

[0040] Step 1: Add 200g SiO 2 / Al 2 o 3 Powdered hydrogen mordenite molecular sieves with a ratio of 20:1 were calcined at 500°C for 4 hours in a dry air atmosphere.

[0041] Step 2: At 250°C, use N 2 Bubble liquid pyridine through hydrogen mordenite molecular sieves for 2 hours, then N 2 Purge for 2 hours and cool to room temperature.

[0042] Step 3: The sample after pyridine modification is placed in 0.1mol / L Cu(NO 3 ) 2 In salt solution, stir at 50°C for 4 hours, then filter, wash, dry, and finally bake at 500°C for 4 hours in a dry air atmosphere.

[0043] Step 4: At 250°C, use N 2 Bubble liquid pyridine through hydrogen mordenite molecular sieves for 2 hours, then N 2 Purge for 2 hours, cool down to room temperature, and seal for later use. The obtai...

Embodiment 2

[0047] This embodiment provides the method for modifying the molecular sieve catalyst for producing methyl acetate by carbonylation of dimethyl ether of the present invention. Compared with Example 1, only the modification temperature of pyridine in step 2 and step 4 is set to 270°C. The rest of the conditions are the same. The modified catalyst was named MOR-2.

[0048] The activity testing method of catalyst after the modification of this embodiment is with embodiment 1, and test result sees Figure 1a with Figure 1b .

Embodiment 3

[0050] This embodiment provides the method for modifying the molecular sieve catalyst for producing methyl acetate by carbonylation of dimethyl ether of the present invention. Compared with Example 1, only the modification temperature of pyridine in step 2 and step 4 is set to 290°C. The rest of the conditions are the same. The modified catalyst was named MOR-3.

[0051] The activity testing method of catalyst after the modification of this embodiment is with embodiment 1, and test result sees Figure 1a with Figure 1b .

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Abstract

The invention discloses a modification method for a methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether, and solves the problem that in the prior art, the catalyst activity and the selectivity are reduced with the increase of the reaction temperature. The modification method provided by the invention comprises the following steps: firstly, carrying out a reaction onnon-metal modified substances with B acid sites on a 12-membered ring pore channel of a catalyst and selectively modifying the 12-membered ring pore channel, then modifying an 8-membered ring pore channel of the catalyst by adopting a metal modified substance, and carrying out ion exchange on the metal ions of the metal modifying substance and the H+ on the 8-membered ring pore channel to preparethe modified molecular sieve catalyst. The invention also discloses the methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether and an application of the methyl acetate molecular sieve catalyst. The preparation method provided by the invention is simple, the operation is simple and convenient, the methyl acetate molecular sieve catalyst prepared by carbonylation of dimethyl ether can be effectively modified, and high catalytic activity and high selectivity of the catalyst can be maintained at a higher reaction temperature.

Description

technical field [0001] The invention belongs to the technical field of organic chemical synthesis, and specifically relates to a molecular sieve catalyst for producing methyl acetate by carbonylation of dimethyl ether, a modification method and application. Background technique [0002] With the increasing demand for energy, the intensification of oil supply tensions, and the increasing pressure on the global environment, fuel ethanol has attracted widespread attention from all over the world for its cleanness and environmental protection. As an important clean energy, ethanol has a proportion of 10% Mixed with gasoline, fuel ethanol gasoline can reduce the emission of carbon monoxide and hydrocarbons in automobile exhaust, which is of great significance for my country to solve the problem of air pollution and achieve sustainable development. After the rapid growth of global fuel ethanol production from 2006 to 2010, affected by the controversy over food consumption, the grow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/18B01J29/22B01J29/24C07C67/37C07C69/14
CPCB01J29/185B01J29/22B01J29/24B01J2229/186C07C67/37C07C69/14
Inventor 刘亚华李扬王科刘芃叶秋云李文龙
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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