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Preparation process for preparing polyoxymethylene dimethyl ether by taking methanol as raw material

A polymethoxy dimethyl ether and a preparation process technology are applied in the production field of diesel fuel additives and can solve the problems of low utilization rate of raw materials, difficulty in separation, unstable operation of devices and the like

Pending Publication Date: 2020-11-24
CHENGDU ZHONGKE CATALYSIS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disclosure utilizes multiple cycles, combined with a one-step refining process route, to solve the problems of difficult separation caused by condensation product impurities, easy blockage of pipelines, large amount of dilute aldehyde, difficult recovery, low raw material utilization rate, and unstable operation of the device

Method used

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  • Preparation process for preparing polyoxymethylene dimethyl ether by taking methanol as raw material
  • Preparation process for preparing polyoxymethylene dimethyl ether by taking methanol as raw material
  • Preparation process for preparing polyoxymethylene dimethyl ether by taking methanol as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] A kind of preparation technology that takes methanol as raw material to prepare polyoxymethylene dimethyl ether, comprises the steps:

[0108] (1) Formaldehyde production unit

[0109] In the formaldehyde oxidation reactor R0101, after the mixture of methanol (stream 1) and methanol recycle stream (recycle stream 16) evaporates, it is mixed with air and enters. Under the action of iron molybdenum oxidation catalyst, formaldehyde is generated at 260 ° C under normal pressure, and then Enter the formaldehyde absorption tower T0101, and the circulating water stream (stream 2) obtained by the chain-end raw material production unit is under the action of the formaldehyde absorption tower T0101 to obtain a concentrated formaldehyde aqueous solution (stream 5) with a concentration of 55.00%.

[0110] (2) Chain growth raw material production unit

[0111] The concentrated formaldehyde aqueous solution (stream 5) obtains the concentrated formaldehyde aqueous solution (stream 6)...

Embodiment 2

[0129] A kind of preparation technology that takes methanol as raw material to prepare polyoxymethylene dimethyl ether, comprises the steps:

[0130] (1) Formaldehyde production unit

[0131] In the formaldehyde oxidation reactor R0101, after the mixture of methanol (stream 1) and methanol recycle stream (recycle stream 16) evaporates, it is mixed with air and enters. Under the action of iron molybdenum oxidation catalyst, formaldehyde is generated at 350 ° C under normal pressure, and then Enter the formaldehyde absorption tower T0101, and the circulating water stream (stream 2) obtained by the chain-end raw material production unit absorbs formaldehyde in the formaldehyde absorption tower T0101 to obtain a concentrated formaldehyde aqueous solution (stream 5) with a concentration of 60.00%.

[0132] (2) Chain growth raw material production unit

[0133] Concentrated formaldehyde aqueous solution (stream 5) is evaporated and concentrated to 78% by thin-film evaporator T0501 ...

Embodiment 3

[0145] A kind of preparation technology that takes methanol as raw material to prepare polyoxymethylene dimethyl ether, comprises the steps:

[0146] (1) Formaldehyde production unit

[0147] In the formaldehyde oxidation reactor R0101, after the mixture of methanol (stream 1) and methanol recycle stream (recycle stream 16) is evaporated, it is mixed with air and enters. Under the action of iron-molybdenum oxidation catalyst, formaldehyde is generated at 300°C and normal pressure and enters formaldehyde The absorption tower T0101, together with the circulating water stream (stream 2) obtained from the chain-end raw material production unit absorbs formaldehyde in the formaldehyde absorption tower T0101 to obtain a concentrated formaldehyde aqueous solution (stream 5) with a concentration of 65.00%.

[0148] (2) Chain growth raw material production unit

[0149] The concentrated formaldehyde aqueous solution (stream 5) is passed into the paraformaldehyde cyclization reactor R0...

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Abstract

The invention relates to a preparation process for preparing polyoxymethylene dimethyl ether (PODE) by using methanol as a raw material, which comprises the following steps: by using methanol and methylal as raw materials, carrying out catalytic oxidation to prepare concentrated formaldehyde with the concentration of 50% or above; dehydrating the concentrated formaldehyde to prepare a chain extension raw material; preparing a chain-terminated raw material methylal with the water content of less than 0.5% through reactive distillation by taking a chain extension raw material byproduct dilute aldehyde and a light-boiling circulating material flow of a separation unit as raw materials; after the chain extension raw material and the chain-terminated raw material are subjected to a condensationreaction, converting formaldehyde, water, formic acid and methyl formate of a condensation product polyoxymethylene dimethyl ether crude product into methanol through catalytic refining by one-step multi-effect refining; and separating the refined product to obtain PODE<3-6>. By adopting the preparation process, the utilization rate of methanol and dilute aldehyde can be effectively improved, multi-element azeotropic impurities are removed, the product quality is improved, and the stability of a device is improved.

Description

technical field [0001] The disclosure relates to the production field of a diesel additive, in particular to a device and a process for preparing polyoxymethylene dimethyl ether from methanol as a raw material. Background technique [0002] Polyoxymethylene dimethyl ether (PODE), as a green and high-efficiency diesel additive, can improve fuel utilization, reduce diesel engine exhaust pollutant emissions, and reduce harmful exhaust emissions from the source. Only need to mix 10%~20% PODE in diesel 3-8 , can significantly reduce the cold filter point of diesel oil, effectively improve the quality of diesel combustion, and reduce the emission of harmful gases such as NOx and particulate matter in the tail gas. Add 20% (volume fraction) of PODE to diesel 3-4 , The emission of soot particles from the combustion of mixed fuels has been reduced by 50%. It is worth noting that when polyoxymethylene dimethyl ether is blended into diesel, it does not require any structural modific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/48C07C43/30C08G2/08C08G2/06
CPCC07C41/48C08G2/08C08G2/06C07C43/30Y02P20/10
Inventor 雷骞陈洪林邓聪迩张小明洪正鹏冯孝庭
Owner CHENGDU ZHONGKE CATALYSIS TECH CO LTD
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