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Process method for preparing polyformaldehyde dimethyl ether from methanol

A technology of polyoxymethylene dimethyl ether and process method, which is applied in chemical instruments and methods, sustainable manufacturing/processing, chemical industry, etc., can solve the problems of low yield, and achieve low production cost, good technical effect, and high yield and the effect of high selectivity

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is the low yield of polyoxymethylene dimethyl ether product components of n=3 and n=4 in the prior art, and a new process for synthesizing polyoxymethylene dimethyl ether by methanol is provided method

Method used

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  • Process method for preparing polyformaldehyde dimethyl ether from methanol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Fill 150g in the fixed bed reactor 5, ferromolybdenum catalyst (composed of molybdenum oxide, iron oxide, iron molybdate in molar ratio 5:1:1), fill 150g HZSM-5 molecular sieve (Si / Al=15), purging device with nitrogen, liquid phase methanol is fed into fixed bed reactor 5 after being heated and vaporized and mixed with preheated air, and the volumetric space velocity of air is 4000h -1 , the feed rate of methyl alcohol is 93.75g / h, the operating temperature of fixed bed reactor 5 is 380 ℃, and the pressure is 1MPa; For the mixture of water methanol and polyoxymethylene dimethyl ether (n=1,2,5,6), the feed rates are 62.5g / h and 111.75g / h respectively. The output from the pre-mixing tank 7 enters the reactive distillation column 12, and its operating conditions are that the reaction temperature is 80° C. and the reaction pressure is 1.0 MPa.

[0027] The methylal is discharged from the top of the reactive distillation tower 12 (stream 14), and the operating pressure is ...

Embodiment 2

[0030] Fill 150g in the fixed bed reactor 5, ferromolybdenum catalyst (composed of molybdenum oxide, iron oxide, iron molybdate in molar ratio 5:1:1), fill 300g HZSM-5 molecular sieve (Si / Al=15), purging device with nitrogen, liquid phase methanol is fed into fixed bed reactor 5 after being heated and vaporized and mixed with preheated air, and the volumetric space velocity of air is 4000h -1 , the feed rate of methyl alcohol is 93.75g / h, the operating temperature of fixed bed reactor 5 is 380 ℃, and the pressure is 1MPa; For the mixture of water methanol and polyoxymethylene dimethyl ether (n=1,2,5,6), the feed rates are 62.5g / h and 87.2g / h respectively. The output from the pre-mixing tank 7 enters the reactive distillation tower 12, and its operating conditions are that the reaction temperature is 100° C. and the reaction pressure is 1.0 MPa.

[0031] The methylal is discharged from the top of the reactive distillation tower 12 (stream 14), and the operating pressure is 1 ...

Embodiment 3

[0034] Fill 150g in the fixed bed reactor 5, ferromolybdenum catalyst (composed of molybdenum oxide, iron oxide, iron molybdate in molar ratio 5:1:1), fill 300g HZSM-5 molecular sieve (Si / Al=15), purging device with nitrogen, liquid phase methanol is fed into fixed bed reactor 5 after being heated and vaporized and mixed with preheated air, and the volumetric space velocity of air is 4000h -1 , the feed rate of methanol is 93.75g / h, the operating temperature of the fixed bed reactor 5 is 380°C, and the pressure is 1MPa; For the mixture of water methanol and polyoxymethylene dimethyl ether (n=1,2,5,6), the feed rates are 62.5g / h and 87.2g / h respectively. The output from the pre-mixing tank 7 enters the reactive distillation column 12, and its operating conditions are that the reaction temperature is 120° C. and the reaction pressure is 1.0 MPa.

[0035] The methylal is discharged from the top of the reactive distillation tower 12 (stream 14), and the operating pressure is 1 M...

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Abstract

The invention relates to a process method for preparing polyformaldehyde dimethyl ether from methanol. The process method adopts an oxidation reaction zone and a reaction rectification zone, wherein the oxidation reaction zone comprises a methanol storage tank (1), a preheater (3), a fixed bed reactor (5) and a pre-mixing tank (7); the oxidation reaction zone comprises the following process steps: preheating methanol to be gasified, mixing with preheated air, feeding into the fixed bed reactor, performing catalytic oxidation on a formaldehyde catalyst prepared through methanol oxidization, thereby generating formaldehyde, feeding the formaldehyde into the pre-mixing tank (7), pre-mixing the formaldehyde with methanol and a circulated and recycled mixture inside the pre-mixing tank before being reacted, and further feeding into the reaction rectification zone; the reaction rectification zone comprises a reaction rectification tower (12), three serially connected separation rectification towers and a product storage tank (28) in sequence; the three serially connected separation rectification towers are respectively a first separation rectification tower (17), a second separation rectification tower (22) and a third separation rectification tower (25). The process method has the characteristic that the yields of n=3 and n=4 are high.

Description

technical field [0001] The invention relates to a process for preparing polyoxymethylene dimethyl ether with methanol. Background technique [0002] In recent years, low-carbon has become a major social theme and has gained increasing attention. For example, how to reduce the highly polluting exhaust emissions brought about by the booming automobile manufacturing industry and how to improve the efficiency of fuel oil use has become a research topic of many institutions. [0003] It is generally accepted that oxygenates are very suitable as diesel blending components. At present, many companies and research institutes are investing in finding and screening suitable oxygen-containing compounds, and the screening objects include: acetals, alcohols, carbonates, lipids, ethers, glycol derivatives, etc. For diesel, oxygenated compounds need to have high cetane number, low self-ignition point, and fast ignition. In addition, it should have good miscibility with ordinary diesel o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56
CPCC07C41/56C07C41/58C07C43/30Y02P20/10
Inventor 高晓晨杨为民高焕新顾军民
Owner CHINA PETROLEUM & CHEM CORP
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