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Method for preparing methyl formate and co-producing dimethyl ether

A technology of methyl formate and dimethyl ether, which is applied in the field of preparation of methyl formate, can solve the problems of strict raw material purity, difficulty in forming scale effect, pollution, etc., and achieve high market economic value, not easy to oxidize and deactivate, atomic High economical effect

Active Publication Date: 2018-07-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst used in this process is generally sodium methoxide, which is easily hydrolyzed by water to form insoluble sodium formate, causing pollution and blockage, and the separation of the catalyst is difficult. Sensitive, the purity requirements of raw materials are very strict
In view of the above reasons, the production scale of a single set of this process route is generally within 100,000 tons / year, and it is difficult to form a scale effect
In addition, the process needs to go through gas production, water gas shift and pressure swing adsorption to obtain carbon monoxide. The investment is very high, which is not conducive to the use of small and medium-sized enterprises.

Method used

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  • Method for preparing methyl formate and co-producing dimethyl ether
  • Method for preparing methyl formate and co-producing dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 50g of hydrogen-type MCM-22 molecular sieve catalyst with a silicon-aluminum ratio (Si:Al)=40:1 was calcined at 550°C for 5 hours in the air atmosphere of a muffle furnace, and a part of the powder sample was taken to be pressed into tablets and crushed into 20-40 mesh , for activity testing. Weigh 10 g of the hydrogen-type MCM-22 molecular sieve catalyst sample, put it into a stainless steel reaction tube with an inner diameter of 8.5 mm, activate it with nitrogen at normal pressure and 550 ° C for 4 hours, then drop it to the reaction temperature (T) = 90 ° C, pass The molar composition of the raw material is 100% methylal, reaction pressure (P)=0.1MPa, methylal mass space velocity (WHSV)=3h -1 , using gas chromatography to analyze the product. After the reaction was stable, the conversion rate of methylal and the selectivity of the product were calculated. The reaction results are shown in Table 1.

Embodiment 2

[0038] The catalyst in Example 1 was replaced with a hydrogen-type ferrierite molecular sieve with a silicon-aluminum ratio (Si:Al)=10:1, except that the reaction temperature was changed to T=150°C, the reaction pressure was changed to P=2MPa, and the methylal Change mass airspeed to WHSV=0.5h -1 , all the other experimental procedures are consistent with Example 1, and the reaction results are shown in Table 1.

Embodiment 3

[0040] The catalyst in Example 1 is replaced by a hydrogen-type ZSM-5 molecular sieve with a silicon-aluminum ratio (Si:Al)=150:1, except that the reaction temperature is changed to T=60° C., and the molar composition of the raw materials is changed to 20% methylal and 80% nitrogen mixture, the reaction pressure is changed to P=1MPa, the mass space velocity of methylal is changed to WHSV=0.01h -1 , 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 application provides a method for preparing methyl formate and co-producing dimethyl ether, which comprises disproportionating raw materials containing methylal through a reactor loaded with a solid acid catalyst to prepare methyl formate and co-producing dimethyl ether. In the method of the present application, the requirement for the purity of the raw material methylal is not high, the catalyst has a long service life, the reaction conditions are mild, the atom economy is high, continuous production is possible, and the method has the potential for large-scale industrial application.

Description

technical field [0001] The application relates to a preparation method of methyl formate. Background technique [0002] In C1 chemistry, after methane chemistry, synthesis gas chemistry and methanol chemistry, methyl formate has gradually developed into a new C1 chemical starting point in recent years because of its economical and effective large-scale production and many downstream products. Raw materials and structural units. Starting from methyl formate, formic acid, acetic acid, ethylene glycol, methyl propionate, methyl acrylate, methyl glycolate, N-formylmorpholine, N-methylformamide, N,N-dimethyl Many C1 chemical and chemical products such as methyl formamide. [0003] At present, the technologies for synthesizing methyl formate include: methanol carbonylation method, methanol catalytic dehydrogenation method, methanol oxidative dehydrogenation method, carbon dioxide and methanol hydrogenation condensation method, synthesis gas direct synthesis method, etc. Among t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C27/00C07C41/28C07C43/04C07C67/475C07C69/06
Inventor 倪友明朱文良刘勇刘红超刘中民李利娜刘世平周慧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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