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Method for purifying 1,3-propylene glycol

A technology of propylene glycol and rectification, which is applied in the biological field, can solve the problems of complex impurities and other problems, and achieve the effects of low cost, increased contact area, and increased effect

Active Publication Date: 2013-07-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the aldehyde content of biological method 1,3-propanediol is not very high, but other impurity components are more complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The fermented liquid treated in this embodiment is the 1,3-propanediol fermented liquid obtained by using glycerol as a substrate and fermented by Klebsiella, and the 1,3-propanediol finished product obtained through a series of separation and purification steps has a purity of 99.56%, platinum-cobalt color is 5 # . After the heating test, the purity of 1,3-propanediol is 96.31wt%, and the chromaticity is 90 # .

[0025] Commodity macroporous powdered activated carbon (120 mesh, specific surface area 1000m 2 / g) Soak in 0.8mol / L hydrochloric acid at room temperature for 5h, then wash with deionized water until neutral, and dry at 100°C for 1.0h to obtain pretreated activated carbon.

[0026]Take 200ml of 1,3-propanediol finished product, add 1.2wt% of pretreated activated carbon, heat to 95°C under stirring at 80r / min, keep the temperature at constant temperature for 0.8h, cool down naturally under stirring, and filter to obtain colorless and transparent 1,3- propyl...

Embodiment 2

[0029] According to the method of Example 1 and the 1,3-propanediol sample, liquid-phase adsorption treatment was carried out with modified activated carbon, and its heating chromaticity was measured. Activated carbon modification conditions are: soak commercial powdered activated carbon (same as in Example 1) with concentrated nitric acid solution for 5.0 h, heat to reflux for 1.5 h, then separate solid from liquid, wash with deionized water until neutral, and vacuum dry at 120°C for 4 h. use.

[0030] Carry out adsorption treatment according to the method and condition of embodiment 1, measure after heating test, adopt the 1 of modified activated carbon adsorption treatment, the purity of 3-propanediol is 99.38%, and heating chromaticity is 20 # .

Embodiment 3

[0032] According to the method of Example 1 and the 1,3-propanediol sample, liquid-phase adsorption treatment was carried out with modified activated carbon, and its heating chromaticity was measured. Activated carbon modification conditions are: soak commercial powdered activated carbon (same as Example 1) with concentrated nitric acid solution for 8.0 hours, heat to reflux for 3.5 hours, then separate solid from liquid, wash with deionized water until neutral, and vacuum dry at 120°C for 5 hours use.

[0033] Carry out adsorption treatment according to the method and condition of embodiment 1, measure after heating test, adopt the 1 of modified activated carbon adsorption treatment, the purity of 3-propanediol is 99.36%, and heating chromaticity is 20 # .

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PUM

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Abstract

The invention discloses a method for purifying 1,3-propylene glycol, in particular to a method for obtaining the heating chroma of 1,3-propylene glycol separated from biological fermentation liquor. The method comprises: after or before rectification, adopting activated carbon as physical adsorbent to absorbing 1,3-propylene glycol while stirring at a certain temperature, so that impurities whichare easy to be subjected to color change caused by heating are absorbed onto the surface of the adsorbent; and then, carrying out solid-liquid separation to obtain the 1,3-propylene glycol with high purity. The method ensures that the heating chroma of the 1,3-propylene glycol is obviously improved, and is used for synthetizing polyester resin with good hue.

Description

technical field [0001] The invention belongs to the field of biotechnology and relates to the refining technology of microbial fermentation products, in particular to a method for purifying 1,3-propanediol, in particular to a method for improving the heating chromaticity of 1,3-propanediol obtained by a biological fermentation method. Background technique [0002] 1,3-Propanediol (1,3-PD) is an important chemical raw material, which is widely used in the manufacture of polyester fibers, polyurethanes, hot melt adhesives, powder coatings, antifreeze agents, packaging materials and organic synthesis intermediates. A wide range of applications, among which the manufacture of high-performance polyester fiber PTT is currently the main application. 1,3-propanediol can be produced through chemical and biological routes, and biotechnology is used to produce 1,3-propanediol, which is characterized by its green chemistry, with mild reaction conditions, easy operation, less by-products...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/76
Inventor 王崇辉
Owner CHINA PETROLEUM & CHEM CORP