Method for purifying 1,3-propylene glycol

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...