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Production method of dibutoxymethane, diethoxymethane, dipropoxymethane or dipentyloxymethane

A technology of diethoxymethane and dipropoxymethane, which is applied in the field of dibutoxymethane, can solve the problems of increasing production costs, decreasing product purity, and unreachable

Active Publication Date: 2014-08-06
李云勇 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dibutoxymethane, diethoxymethane, dipropoxymethane and dipentoxymethane produced by traditional methods need to pass through more than two rectification towers to improve their purity, but the water content is generally About 1000ppm, unable to meet the requirement of less than 100ppm
If it is necessary to reduce the water content, it is necessary to use a dehydrating agent, and the addition of a dehydrating agent not only increases the production cost, but also leads to a decrease in the purity of the product

Method used

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  • Production method of dibutoxymethane, diethoxymethane, dipropoxymethane or dipentyloxymethane

Examples

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Embodiment 1 2

[0020] The production method of embodiment 1 dibutoxymethane

[0021] Put formaldehyde and butanol into the mixing tank at a ratio of 5:1, heat to 70°C, then add the acid catalyst to the reactor at a certain rate, and raise the temperature to 180°C, the gas continuously escapes from the reactor and enters the reactor The connected rectification tower; the system is evacuated, the pressure is controlled at -0.09MPa, and the dibutoxymethane product with a concentration of 95.0% is obtained at the bottom of the rectification tower. The top of the distillation tower is water and a small amount of organic matter, which is discharged into the wastewater treatment system. The whole production method is continuous production, no need to add dehydrating agent during the production process.

Embodiment 2 2

[0022] The production method of embodiment 2 dipentoxymethane

[0023] Paraformaldehyde and amyl alcohol are added into the mixing tank at a ratio of 1:5, heated to 160°C, then added to the reactor at a certain rate, acid catalyst is added to the reactor, and the temperature is raised to 200°C, the gas continuously escapes from the reactor and enters the reactor. The rectifying tower connected to the reactor; the system is evacuated, the pressure is controlled at -0.09MPa, and the concentration of 99.5% dipentoxymethane product is obtained at the bottom of the rectifying tower. The top of the distillation tower is water and a small amount of organic matter, which is discharged into the wastewater treatment system.

Embodiment 3 2

[0024] The production method of embodiment 3 diethoxymethane

[0025] Paraformaldehyde and ethanol are added into the mixing tank at a ratio of 1:4, heated to 145°C, then added to the reactor at a certain rate, and acid catalyst is added to the reactor, and the temperature is raised to 160°C, the gas continuously escapes from the reactor and enters the reactor The connected rectification tower; the system is evacuated, and the pressure is controlled at -0.06MPa, and a diethoxymethane product with a concentration of 97.8% is obtained at the bottom of the rectification tower. The top of the distillation tower is water and a small amount of organic matter, which is discharged into the wastewater treatment system.

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Abstract

The invention provides a production method of dibutoxymethane, diethoxymethane, dipropoxymethane or dipentyloxymethane. The production method comprises the following steps of 1, taking formaldehyde or a formaldehyde derivative, mixing the formaldehyde or formaldehyde derivative and an alcohol raw material, and pre-heating the mixture to a temperature of 70-160 DEG C, 2, feeding the pre-heated mixture into a reactor, adding an acid catalyst into the reactor, carrying out heating until an alcohol-acid condensation reaction occurs and the materials in the reactor vaporize, and 3, releasing the produced gas from the reactor, directly feeding the gas into a rectifying tower communicated with the reactor, carrying out rectification, and taking out the product on the bottom of the rectifying tower, wherein the internal pressure of the rectifying tower is less than zero. The production method only adopts a rectifying tower-based treatment process, does not additionally use a dehydrating agent, and can produce a dibutoxymethane equimolecular quantity conditioning agent having water content less than 100ppm and purity more than 95%. The production method has simple processes and short production time, obviously reduces energy consumption and is suitable for industrial production.

Description

technical field [0001] The invention relates to a production method of dibutoxymethane, diethoxymethane, dipropoxymethane and dipentoxymethane. Background technique [0002] Dibutoxymethane, diethoxymethane, dipropoxymethane and dipentoxymethane are widely used in industry, not only as solvents in organic synthesis, solvents in batteries, fuel additives, etc. It can also be used as a reagent for organic reactions. [0003] Polyoxymethylene, also known as polyoxymethylene, is a main chain containing (–CH 2 -O-) chain link linear polymer. In order to obtain a polyoxymethylene resin with a suitable molecular weight, such as a product with a melt index of 9.0g / 10min (its number-average molecular weight is generally 180000-220000g / mol), it is necessary to use a molecular weight regulator to adjust the molecular weight of the product during the polymerization process. regulation. Dibutoxymethane, diethoxymethane, dipropoxymethane and dipentoxymethane are all very suitable as m...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56C07C41/50
CPCC07C41/56C07C41/58C07C43/30
Inventor 李云勇周涛程晔华
Owner 李云勇
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