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Method and apparatus for recovering N-t-butyl acrylamide

A technology of tert-butylacrylamide and tert-butylacrylamide sulfonic acid, applied in the separation/purification of carboxylic acid amide, organic chemistry, etc., can solve the problems of increasing production costs and achieve the effect of improving appearance

Inactive Publication Date: 2016-04-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods not only do not produce economic benefits, but also increase production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 50g of AMPS production plant mixed waste residue is recovered according to the method of the present invention. The mass percentage of AMPS in the waste residue is 7%, the mass percentage of N-tert-butylacrylamide is 86%, and also contains a small amount of other impurities. The waste residue was added to a three-necked flask, and then 100 g of water and 5 g of activated carbon were added, stirred for 5 min, and then filtered. The filtrate was added to a glass distillation flask, the lower part of the distillation flask was heated with a water bath, the upper part and the vacuum distillation pipeline were heated with an electric wire, and the stirring was started. The temperature in the glass retort was then maintained at 90°C. At the same time, the temperature in the collection bottle was set to 15°C. Turn on the vacuum system to keep the pressure in the recovery unit at 10kPa. The recovery process lasted for a total of 2 hours. The contents of the collection bottl...

Embodiment 2

[0026] A recovery method similar to that of Example 1 was used, except that the temperature of the distillation flask and pipeline was set at 70° C., the recovery process lasted 4 hours, and the vacuum system pressure was 10 kPa. A total of 37g of the product obtained after drying the material in the collection bottle was mainly composed of N-tert-butylacrylamide, and the purity was 99.7% according to liquid chromatography analysis.

Embodiment 3

[0028]A recovery method similar to that of Example 1 was used, except that the recovery process lasted 5 hours, and the vacuum system pressure was 15 kPa. A total of 37.5 g of the product obtained after drying the material in the collection bottle was mainly composed of N-tert-butylacrylamide, and the purity was 99.6% according to liquid chromatography analysis.

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Abstract

The present invention relates to a method for recovering N-t-butyl acrylamide. The method comprises: mixing waste residue obtained after 2-acrylamide-2-methylpropanesulfonic acid production, a solvent and an adsorbent, filtering, carrying out vacuum heating on the filtrate, continuously heating the remaining solid after evaporating the solvent so as to sublime the remaining solid, and recovering the sublimed product to obtain the N-t-butyl acrylamide, wherein the vacuum heating is performed at a temperature of 40-120 DEG C under a pressure of 1-50k Pa, and the purity of the recovered N-t-butyl acrylamide is more than or equal to 99.5%. The present invention further provides a recovery apparatus for the method, wherein the recovery apparatus comprises a heatable separation container for heating the waste residue obtained after the 2-acrylamide-2-methylpropanesulfonic acid production, a temperature-adjustable collection container for collecting the sublimed N-t-butyl acrylamide, and a vacuum system.

Description

technical field [0001] The invention relates to a method for recovering N-tert-butylacrylamide from the waste residue of producing tert-butylacrylamide sulfonic acid, and a corresponding recovery device. Background technique [0002] N-tert-butylacrylamide (molecular formula C 7 h 13 NO, English name N-tert-Butylacrylamide) is a hydrophobic monomer with amide groups, which can be used for the synthesis of hydrophobically associated water-soluble polymers. Hydrophobically associated water-soluble polymers refer to water-soluble polymers with a small amount of hydrophobic groups on the molecular chain, which makes the solution properties show unique rheological properties. Because it has both hydrophilic segments and hydrophobic groups, it can be regarded as A polymeric surfactant. The microdomains formed by hydrophobic groups can be regarded as micelles formed by surfactants, so there is a critical micelle concentration in a certain range of polymer concentration. Above th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/24C07C233/09
Inventor 李斗星齐兰芝黄凤兴张明森穆晓蕾贾春革
Owner CHINA PETROLEUM & CHEM CORP
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