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Method for making methyl acetate through carbonylation of dimethyl ether and the modified molecular sieve catalyst and modification method thereof

A technology of methyl acetate and molecular sieve, which is applied in molecular sieve catalysts, physical/chemical process catalysts, catalyst protection, etc., to achieve the effects of improving conversion rate, prolonging life, and inhibiting side reactions of carbon deposition

Active Publication Date: 2017-01-11
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

[0006] In order to solve the problems of the existing synthesis process, the present invention uses a special modification method to obtain a modified molecular sieve catalyst for the carbonylation of dimethyl ether to methyl acetate with long life, high catalytic activity and high stability, and then provides dimethyl ether The process of producing methyl acetate by carbonylation of ether is of great significance to the realization of the above-mentioned synthetic ethanol process route

Method used

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  • Method for making methyl acetate through carbonylation of dimethyl ether and the modified molecular sieve catalyst and modification method thereof
  • Method for making methyl acetate through carbonylation of dimethyl ether and the modified molecular sieve catalyst and modification method thereof
  • Method for making methyl acetate through carbonylation of dimethyl ether and the modified molecular sieve catalyst and modification method thereof

Examples

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Effect test

Embodiment 1

[0037] 200 g of hydrogen-type mordenite molecular sieves with a silicon-aluminum ratio of 7:1 were calcined at 500° C. for 4 hours in a dry air atmosphere. Take 10 g of the powder sample, press it into tablets, and crush it into 12-20 mesh granule samples for the test of dimethyl ether carbonylation activity. Weigh 3.0 g of the sample and put it into a stainless steel reaction tube with an inner diameter of 20 mm and activate it at 400 °C under normal pressure and nitrogen atmosphere for 2 hours, the nitrogen flow rate is 100 mL / min, then cool down to 280 °C, and use nitrogen bubbles to modify the liquid The substance methyl acetate causes chemical adsorption to occur on the hydrogen-type mordenite molecular sieve, the nitrogen flow rate is controlled to 200mL / min and the adsorption time is 2 hours, the flow rate of methyl acetate is controlled to 0.05mL / min, and then nitrogen is purged with the same flow rate hours, and then lowered the temperature to 230°C, and the modified ...

Embodiment 2

[0040] The implementation steps are the same as in Example 1, except that the modified substance methyl acetate is replaced by methyl alcohol, and the modified catalyst is called MOR-2. The activity test results of the modified catalyst are shown in Figure 1a and Figure 1b .

Embodiment 3

[0042] The implementation steps are the same as in Example 1, except that the modified substance methyl acetate is replaced by ethyl acetate, and the modified catalyst is called MOR-3. The activity test results of the modified catalyst are shown in Figure 1a and Figure 1b .

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Abstract

The invention discloses a method for making methyl acetate through carbonylation of dimethyl ether and the modified molecular sieve catalyst and modification method thereof. The modification method is to pass the modified substance that is diluted by the diluent gas through the reactor filled with hydrogen type zeolite molecular sieve catalyst at an adsorbent temperature of 100-400 oC under normal pressure condition, so that the modified substance can have chemisorption on the hydrogen type zeolite molecular sieve catalyst to obtain modified molecular sieve catalyst; the modified substance can be liquid modified substance and / or gaseous modified substance. The modified molecular sieve catalyst can be obtained by using the modification method in which the modified molecular sieve catalyst for making methyl acetate through carbonylation of dimethyl ether can be obtained. The method for making methyl acetate through carbonylation of dimethyl ether is to pass the raw gas consisting of dimethyl ether, carbon monoxide and hydrogen through the reactor filled with the modified molecular sieve catalyst for reaction to obtain the methyl acetate. Through the modification of hydrogen type zeolite molecular sieve catalyst by the modified substance, the method can effectively inhibit the side-reaction of carbon deposit and greatly prolong the service life.

Description

technical field [0001] The invention belongs to the technical field of organic chemical synthesis, and more specifically relates to a method for preparing methyl acetate by carbonylation of dimethyl ether, a modified molecular sieve catalyst and a modification method thereof. 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 co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J33/00C07C67/37C07C69/14
CPCB01J31/26B01J33/00B01J2229/26B01J2229/34C07C67/37C07C69/14
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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