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Film dehydrating method of raw materials used for preparing polymethoxyldimethyl ether

A technology of polyoxymethylene dimethyl ether and raw materials, which is applied in the field of film dehydration and pervaporation membrane application in the production of polyoxymethylene dimethyl ether, which can solve problems such as incompetence, and achieve stable product quality and simple process , reduce the effect of side effects

Inactive Publication Date: 2017-03-29
东方红升江苏新能源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patents of BASF and BP clearly stated that this reaction process requires the strict requirement that the water content of raw materials should be ≤0.5-1%. The existing formaldehyde evaporation concentration dehydration technology is no longer capable of meeting this requirement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The membrane dehydration process was carried out with a 37% aqueous formaldehyde solution and a mixture of methylal.

[0025] Mix 400g of formaldehyde aqueous solution containing 37% formaldehyde with 380g of methylal solution containing 99.5% of methylal, use intermittent dehydration device, and use silica ceramic membrane in series (total membrane area is 0.038m 2 ), heat the liquid mixture to 80°C, flow through the membrane surface at a flow rate of 100ml / min, the gauge pressure on the feed liquid side is 0.24MPa, and the absolute pressure on the permeate side is 2000Pa. After 8 hours of dehydration, the moisture content of the mixture was reduced to 4.8% based on formaldehyde.

Embodiment 2

[0027] The membrane dehydration process was carried out with a 50% aqueous formaldehyde solution and a mixture of methylal.

[0028] Mix 500g of formaldehyde aqueous solution containing 50% formaldehyde with 500g of methylal solution containing 99.5% of methylal, use intermittent dehydration device, and use silica ceramic membrane in series (the total membrane area is 0.21m 2 ), the liquid mixture is heated to 110°C, and flows through the membrane surface at a flow rate of 300ml / min. The gauge pressure on the feed liquid side is 0.63MPa, and the absolute pressure on the permeate side is 2000Pa. The moisture of the mixture was reduced to 1.71% based on formaldehyde.

Embodiment 3

[0030] Membrane dehydration process with 85% formaldehyde aqueous solution and methylal mixture

[0031] Mix the formaldehyde aqueous solution containing 85% formaldehyde with the methylal solution containing 99.5% methylal, adopt a continuous dehydration device, and use silica ceramic membranes in series (the total membrane area is 0.038m 2 ), heat the liquid mixture to 100°C, flow through the membrane surface at a flow rate of 2.5ml / min, the gauge pressure on the feed liquid side is 0.4MPa, and the absolute pressure on the permeate side is 1000Pa. The moisture in the formaldehyde-based mixture at the outlet of the membrane dehydration unit was reduced to 0.44%.

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PUM

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Abstract

The invention discloses a film dehydrating method of raw materials used for preparing polymethoxyldimethyl ether. The raw materials comprise a mixture of a formaldehyde solution, methylal and methanol. The mixture flows across the surface of a film in a fluid or steam state, and driven by the water partial pressure of the two sides of the film, water in the mixture selectively penetrates through the separation film. The method is high in efficiency, low in energy consumption, simple in process and convenient to operate.

Description

technical field [0001] The invention relates to a raw material membrane dehydration method for preparing polyoxymethylene dimethyl ether, belonging to the field of pervaporation membrane application (chemical separation technology). Background technique [0002] With the increasing consumption of gasoline and diesel and the continuous emergence of large areas of smog, my country is facing the huge challenge of upgrading gasoline and diesel. Oxygen-containing compounds are used as gasoline and diesel additives, and their oxygen atoms form oxygen-containing intermediates that can promote combustion reactions, improve fuel combustion conditions and reduce pollutant emissions. Among them, polyoxymethylene dimethyl ethers (Polyoxymethylene dimethyl ethers, referred to as PODE or DMM n ) has the characteristics of high cetane number, high oxygen content, low sulfur content, and no aromatics. Polyoxymethylene dimethyl ether with a suitable polymerization degree (n) value is a kind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D61/36C07C41/56C07C43/30C08G65/00
CPCB01D61/362B01D71/02C07C41/56C08G65/00C07C43/30Y02P20/10
Inventor 洪正鹏雷骞冯孝庭张小明韩瑜张文东陈洪林
Owner 东方红升江苏新能源有限公司
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