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Method for preparing methyl acetate by carbonylating dimethyl ether

A technology for methyl acetate and dimethyl ether, which is applied in the field of preparing methyl acetate by carbonylation of dimethyl ether, can solve problems such as rapid catalyst deactivation, and achieve the effects of inhibiting carbon deposition, maintaining stable activity and improving stability

Active Publication Date: 2009-12-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Volkova [Catalysis Letters 80 (2002) 175] reported the carbonylation process of dimethyl ether catalyzed by a Rh-containing heteropolyacid catalyst. The product is mainly methyl acetate, but the catalyst deactivates quickly

Method used

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  • Method for preparing methyl acetate by carbonylating dimethyl ether
  • Method for preparing methyl acetate by carbonylating dimethyl ether
  • Method for preparing methyl acetate by carbonylating dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 100g NaMOR (Si / Al=5.6) to 1.5L, 1mol / L NH 4 NO 3 solution, kept at 90°C for 3 hours, then filtered, washed with 1L deionized water, and dried. Repeat the above exchange process 3 times. After the last exchange, it was dried at 110° C. for 12 hours, and then calcined at 500° C. for 6 hours in an air atmosphere in a muffle furnace to obtain a powdered catalyst. A part of the powder sample was pressed into flakes, pulverized, sieved to 40-60 mesh, used for activity test, and recorded as #1 catalyst.

Embodiment 2

[0032] Add 10g #1 catalyst to 300ml, 2mol / L HNO 3 The solution was treated at 80°C for 10 hours under vigorous stirring. Then it is filtered, washed with 2L of deionized water, dried at 110°C for 12 hours, and baked in a muffle furnace at 500°C for 6 hours. A part of the powder sample was pressed into flakes, crushed, sieved to 40-60 mesh, and used for activity test, which was recorded as #2 catalyst.

Embodiment 3-4

[0034] HNO used to treat #1 3 The concentration is 4mol / L and 8mol / L successively, and all the other preparation conditions are the same with embodiment example 2. And recorded as #3 and #4 catalysts in turn.

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Abstract

The invention discloses a catalyst modification method for preparing methyl acetate by carbonylating dimethyl ether. The method is applied to the reaction process in which the dimethyl ether reacts with the carbon monoxide to high selectively form methyl acetate in the presence of an acid molecular sieve catalyst, particularly a mordenite molecular sieve. Pyridine organic amines are utilized to modify the mordenite molecular sieve and modify a channel structure and the acidity of the molecular sieve, thereby effectively inhibiting carbon deposition and greatly improving the stability of catalysts. The use of the catalysts by the method can catalyze the carbonylation of dimethyl ether to obtain methyl acetate under mild conditions. The conversion rate of dimethyl ether is between 10 and 60percent, the selectivity of the methyl acetate is over 99 percent, and the activity of the catalysts is kept steady after the reaction is performed for 48 hours.

Description

technical field [0001] The invention relates to a reaction process and a catalyst modification method for producing methyl acetate by catalyzing the carbonylation of dimethyl ether with solid molecular sieves under mild conditions; it is a process for producing methyl acetate by catalyzing the carbonylation of dimethyl ether; the catalyst used It is H-type mordenite and H-type mordenite adsorbed by pyridine organic amines. Background technique [0002] Acetic acid is an important organic chemical raw material for the production of vinyl acetate, cellulose acetate, acetic anhydride, etc. Its global annual output has exceeded 10 million tons. At present, the production process of acetic acid in industry mainly uses Monsanto [GB 1,277,242] and BP [EP 0,849,248] methods, using precious metal Rh or Ir as catalyst, CH 3 I is used as a cocatalyst, and it is realized by methanol carbonylation under homogeneous conditions. However, due to the strong corrosiveness of methyl iodide,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/37B01J31/02
Inventor 申文杰刘俊龙黄秀敏薛会福李勇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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