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A kind of method for preparing methyl acetate

A technology of methyl acetate and dimethyl ether, applied in the field of preparing methyl acetate, can solve the problems of short life, poor catalyst stability, restricted application and the like, and achieve the effects of prolonging life and improving stability

Active Publication Date: 2016-01-06
YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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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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  • A kind of method for preparing methyl acetate
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Examples

Experimental program
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Effect test

Embodiment 1

[0036] 50 g of hydrogen-type mordenite with a silicon-aluminum ratio of 4:1 was calcined at 550° C. for 5 hours in an air atmosphere in a muffle furnace, and a part of the powder samples were pressed into tablets and crushed into 20-40 meshes for activity testing. Weigh 10g of the hydrogen-form 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 blow pyridine into the hydrogen-form mordenite by bubbling pyridine liquid with nitrogen , treated for 2 hours, then purged with nitrogen for 1 hour, then lowered to 250 ° C, introduced carbon monoxide: dimethyl ether: pyridine = 15: 1: 0.001, slowly boosted to reaction pressure 2MPa, controlled reaction space velocity GHSV = 1000h -1 , using gas chromatography to detect and analyze the tail gas online, and calculate the conversion rate of dimethyl ether and the selectivity of methyl acetate. The reaction results are sh...

Embodiment 2

[0038] The experimental procedure is the same as in Example 1, the silicon-aluminum ratio of the hydrogen-type mordenite is changed to 6:1, the adsorption of pyridine on the catalyst is changed to 2,3-dichloro-5-trifluoromethylpyridine, and the pyridine in the raw material gas is changed to 2-fluoropyridine, all the other experimental procedures are consistent with Example 1, and the reaction results are shown in Table 1.

Embodiment 3

[0040] The experimental procedure is the same as in Example 1, the silicon-aluminum ratio of the hydrogen-type mordenite is changed to 60:1, the pyridine adsorbed on the catalyst is changed to 2-iodopyridine, and the pyridine in the raw material gas is changed to 2-bromo with a molar ratio of 1:1. Pyridine and 2-chloropyridine, all the other experimental procedures 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 preparing methyl acetate. According to the method, raw material gas containing pyridine 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 pyridine organic amine absorbed hydrogen-type mordenite molecular sieve catalyst. According to the method, pyridine organic amine absorbed hydrogen-type mordenite molecular sieve is taken as the catalyst, and pyridine organic amine is added into the raw material gas, so that desorption of pyridine 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 present invention relates to a kind of method of preparing methyl acetate, especially the 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 its derivatives such as acetic anhydride and vinyl acetate. At present, acetic acid is mainly industrially produced through the homogeneous methanol carbonylation method of Monsanto and BP. During the reaction process, noble metal catalysts containing Rh or Ir and corrosive CH are used. 3 I and other co-catalysts [J.Catal.245 (2007) 110-123]. Methyl acetate can also be synthesized into ethanol by hydrogenation reduction [ChemSusChem3 (2010) 1192-1199]. Ethanol has a higher octane number than gasoline, can be completely burned in internal combustion engines, and can be used alone or mixed with gasoline as a fuel for automobi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 YANCHANG ZHONGKE (DALIAN) ENERGY TECH CO LTD
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