Method and system for purifying monomers

A monomer and equipment technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc.

Inactive Publication Date: 2012-03-28
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particularly high product purity required for this cannot be achieved with the method detailed in EP-A-1 090 904

Method used

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  • Method and system for purifying monomers
  • Method and system for purifying monomers
  • Method and system for purifying monomers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] A composition comprising approximately 98% by weight 2-hydroxyethyl methacrylate (HEMA) and approximately 50 ppm hydroquinone monomethyl ether was introduced into a short path evaporator. Adjust the pressure in the short path evaporator and the temperature of the vapor so that 440kg / h / m is obtained according to the relation (1) 2 value. The mass flow density of vapor established by evaporating temperature and condensing temperature is 27kg / h / m 2 . Under these conditions, impurities with low boiling points are removed by evaporation, leaving 2-hydroxyethyl methacrylate to be purified in the residue. No significant polymerization of the supplied composition was found in the short path evaporator.

[0101] The residue obtained from said first evaporation process is conducted a second time into a short path evaporator. In this case, adjust the pressure in the short-path evaporator and the temperature of the vapor to meet the requirement of obtaining 112kg / h / m according ...

Embodiment 2

[0103] A composition comprising about 98% by weight 2-hydroxyethyl methacrylate (HEMA) and about 50 ppm hydroquinone monomethyl ether was introduced into a short path evaporator. Adjust the pressure in the short-path evaporator and the temperature of the vapor so that 369 kg / h / m is obtained according to relation (1) 2 value. The mass flow density of vapor established by evaporating temperature and condensing temperature is 32kg / h / m 2 . Under these conditions, impurities with low boiling points are removed by evaporation, leaving 2-hydroxyethyl methacrylate to be purified in the residue. No significant polymerization of the fed composition was found in the short path evaporator.

[0104] The residue obtained from said first evaporation process is conducted a second time into a short path evaporator. In this case, adjust the pressure in the short-path evaporator and the temperature of the steam to meet the requirement of obtaining 296kg / h / m according to relational formula (I...

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Abstract

The present invention relates to a method for purifying monomers, wherein at least part of the monomers present in a starting composition is evaporated and is subsequently condensed, characterized in that at least part of the starting composition is evaporated in a short path evaporator, wherein the mass flow density of the vapors m is selected according to the relation (I), where M is the average molecular mass of the vapors in the short path evaporator in kg / kmol, T is the temperature of the vapors in K, pi is the pressure in the short path evaporator in mbar, and m is the mass flow density of the vapors in kg / (m2.h). The present invention further relates to a system for carrying out the method.

Description

technical field [0001] The present invention relates to a method of purifying monomers. The invention also describes a device for carrying out such a method. Background technique [0002] Monomers are reactive compounds that can be readily polymerized. While this polymerization can in many cases be minimized by adding inhibitors, these compounds can cause discoloration and side reactions. Furthermore, larger amounts of stabilizers may adversely affect the further processing of the monomers in subsequent polymerization reactions, so that some regulations limit the content of stabilizers. Purification of monomers is thus a perennial problem. This is the case in particular for monomers with high boiling points, since they are purified under conditions which inhibit the polymerization only with relative difficulty, ie with large amounts of inhibitors. It is therefore extremely difficult to obtain, inter alia, very reactive monomers with high boiling points in very high purit...

Claims

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Application Information

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IPC IPC(8): C07C67/54C07C69/54C07C51/573C07C57/04B01D3/12B01D3/42
CPCC07C67/54B01D3/42C07C51/573B01D3/12
Inventor D·布罗尔C·毛尔B·劳克斯V·施立普
Owner EVONIK ROEHM GMBH
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