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Method used for producing methyl acetate

A technology of methyl acetate and dimethyl ether, which is applied in the field of preparing methyl acetate through carbonylation of dimethyl ether, can solve the problems of short life, poor catalyst stability, and restricted application, and achieve the effect of prolonging life and improving stability

Active Publication Date: 2014-07-02
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

However, under the reaction conditions, the pyridine adsorbed in the mordenite will slowly desorb, and the carbon deposition of the zeolite molecular sieve will also slowly increase, resulting in a gradual decline in catalyst activity, poor catalyst stability and short life, which seriously restricts its use in large-scale applications. Application in large-scale industrial production

Method used

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  • Method used for producing methyl acetate
  • Method used for producing methyl acetate
  • Method used for producing methyl acetate

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 50g of hydrogen-type mordenite with a silicon-to-aluminum ratio of 4:1 was calcined at 550°C in an air atmosphere of a muffle furnace for 5 hours, and a part of the powder samples were taken into tablets and crushed into 20-40 meshes for activity testing. Weigh 10g of the hydrogen-type mordenite sample, put it into a stainless steel reaction tube with an inner diameter of 8.5mm, activate it with nitrogen at normal pressure and 300°C for 1 hour, and then bubbling with nitrogen Liquid, will Blow into the hydrogen-type mordenite, treat for 2 hours, then purge with nitrogen for 1 hour, then drop to 250°C, and pass in carbon monoxide: dimethyl ether: Slowly increase the pressure to the reaction pressure of 2MPa, control the reaction space velocity GHSV=1000h -1 , Use gas chromatography to detect and analyze the tail gas online, calculate the conversion rate of dimethyl ether and the selectivity of methyl acetate, the reaction results are shown in Table 1.

Embodiment 2

[0042] The experimental procedure is the same as in Example 1. The silicon-to-alumina ratio of the hydrogen mordenite is changed to 6:1, and the alicyclic organic amine pre-adsorbed on the catalyst is changed to Alicyclic organic amine in the feed gas is replaced by The remaining experimental steps are consistent with Example 1, and the reaction results are shown in Table 1.

Embodiment 3

[0044] The experimental procedure is the same as in Example 1. The silicon-aluminum ratio of the hydrogen mordenite is changed to 60:1, and the alicyclic organic amine pre-adsorbed on the catalyst is changed to The alicyclic organic amine in the feed gas is replaced with a molar ratio of 1:1 The remaining experimental steps are consistent with Example 1, and the reaction results are shown in Table 1.

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Abstract

The invention provides a method used for producing methyl acetate. According to the method, raw material gas containing alicyclic organic amine, dimethyl ether, carbonic oxide, and optionally selected hydrogen passes through a reaction reactor filled with a hydrogen-type mordenite molecular sieve catalyst so as to prepare methyl acetate, wherein the hydrogen-type mordenite molecular sieve catalyst is alicyclic organic amine absorbed hydrogen-type mordenite molecular sieve catalyst. According to the method, alicyclic organic amine absorbed hydrogen-type mordenite molecular sieve is taken as the catalyst, and alicyclic organic amine is added into the raw material gas, so that desorption of alicyclic organic amine in reaction processes can be made up stably, stability of the catalyst is increased, and service life of the catalyst is prolonged.

Description

Technical field [0001] The invention relates to a method for producing methyl acetate, in particular to a method for preparing methyl acetate through carbonylation of dimethyl ether. Background technique [0002] Methyl acetate is an important organic chemical raw material and solvent. Methyl acetate can be used to synthesize acetic acid and derivatives of acetic acid such as acetic anhydride and vinyl acetate. At present, acetic acid is mainly produced industrially through the homogeneous methanol carbonylation method of Monsanto and BP. In the reaction process, noble metal catalysts containing Rh or Ir and corrosive CH are used. 3 I and other promoters [J. Catal. 245 (2007) 110 ~ 123]. Methyl acetate can also be reduced to synthesize ethanol by hydrogenation [ChemSusChem 3(2010) 1192-1199]. Ethanol has a higher octane number than gasoline, and can be completely burned in internal combustion engines. It can be used alone or mixed with gasoline as a fuel for automobiles. Now et...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/37
CPCC07C67/37C07C69/14
Inventor 倪友明朱文良刘红超刘勇刘中民孟霜鹤李利娜刘世平周慧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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