Method for preparing color-stable epsilon-caprolactone

A color-stable, caprolactone technology, applied in organic chemistry and other directions, can solve problems such as affecting the yield of ε-caprolactone, and achieve the effect of solving the color problem, being economical, and simple in processing.

Inactive Publication Date: 2010-07-21
JIANGSU QINGQUAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding strong acid and strong base to the preparation process of caprolactone may promote the polymerization of ε-caprolactone, thereby affecting the yield of ε-caprolactone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add ε-caprolactone 200g in the 500ml reactor with heating, stirring, thermometer, its mass content is 99.67%, acid value is 0.12mgKOH / g, chroma is 50 black Zeng, and moisture content is 0.02%. After heating up to 50°C, 2g of activated carbon was added, and the mixture was stirred and reacted at the same temperature for 1 hour. After removing activated carbon by filtration, the color of ε-caprolactone is less than 10 Hazen; the concentration, moisture and acid value remain unchanged. After 100 g of decolorized ε-caprolactone is placed at room temperature (25° C.) for two weeks, its chromaticity is less than 10 Hazen. Another 100 g was tested after keeping at 95° C. for 4 hours, and its chromaticity was less than 10 Hazen.

Embodiment 2

[0016] Add ε-caprolactone 200g in the 500ml reactor with heating, stirring, thermometer, its mass content is 99.73%, acid value is 0.09mgKOH / g, chromaticity is 20 black Zeng, and moisture content is 0.03%. After heating up to 55°C, 0.2 g of activated carbon was added, and the mixture was stirred and reacted at the same temperature for 2 hours. After removing activated carbon by filtration, the color of ε-caprolactone is less than 10 Hazen; the concentration, moisture and acid value remain unchanged. After 100 g of decolorized ε-caprolactone is placed at room temperature (25° C.) for two weeks, its chromaticity is less than 10 Hazen. Another 100 g was tested after keeping at 95° C. for 4 hours, and its chromaticity was less than 10 Hazen.

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PUM

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Abstract

The invention discloses a method for preparing color-stable epsilon-caprolactone, which comprises the following steps: using activated carbon and epsilon-caprolactone to carry out a contact reaction for 0.1 to 10 hours at the temperature of 25 to 80 DEG C, separating the activated carbon and the epsilon-caprolactone, and then decolorizing the epsilon-caprolactone. The chroma of the epsilon-caprolactone prepared by using the invention is 10 platinum-cobalt Hazen and below, and the color thereof has good stability along with time and temperature.

Description

technical field [0001] The invention relates to a preparation method of ε-caprolactone. Background technique [0002] ε-caprolactone is an important intermediate in organic synthesis. ε-caprolactone can be used to synthesize polycaprolactone for different purposes; polycaprolactone is a kind of polymer material that can be completely biodegradable, it has unique biocompatibility, biodegradability and good permeability, in Materials, environmental protection and medical aspects have been widely used. ε-caprolactone can also be copolymerized or blended with various resins to improve the gloss, transparency and anti-adhesive properties of the product. Such products can be used as agricultural films, adhesives, controlled release of fertilizers and packaging materials. ε-caprolactone can also be used as a strong solvent, showing good solubility to some insoluble resins. [0003] Due to the difficulties in raw material quality, product stability and production safety in the sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D313/04
Inventor 邵建华欧颖崇田甜冷冰汤廷翔
Owner JIANGSU QINGQUAN CHEM CO LTD
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