4511-42-6Relevant articles and documents
SYNTHESIS METHOD AND DEVICE FOR RAPIDLY PRODUCING LACTIDE AT HIGH YIELD
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Paragraph 0050-0114, (2021/06/26)
The invention discloses a synthesis method and device for rapidly producing lactide at high yield. The method comprises: adding a single component of lactic acid or two components of lactic acid and catalyst, passing the mixture through a mixer to enter an oligomer preparation system, increasing a residence time through bottom circulation, synthesizing oligomeric lactic acid, and passing a gas-phase component through a rectification system. With the adoption of the device, the lactide is capable of being efficiently synthesized, crude lactide with a yield of 94% to 98% is capable of being obtained.
Method for synthesizing rod-like long L-lactide crystal with high optical purity
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Paragraph 0017-0035, (2019/01/17)
The invention discloses a method for synthesizing a rod-like long L-lactide crystal with high optical purity, namely the method for synthesizing the rod-like long L-lactide crystal with the high optical purity by utilizing a decompression method with lactic acid as a raw material. A synthesis technology of the rod-like long L-lactide crystal with the high optical purity comprises the following conditions: the amount of a certain amount of the lactic acid is 10-50mL, the volume of a proper amount of catalyst stannous octoate is 1-10mL, the gradually rising temperature range from 90 to 190 DEG C, and the pressure of a reduced pressure distillation reaction is minus 0.10MPa to 0.10MPa, and a certain time is 1-10h. A synthesis method of the rod-like long L-lactide crystal with the high opticalpurity comprises the following steps: 1), taking a certain amount of the lactic acid, adding into a three-necked bottle of 250mL, then adding a proper amount of stannous octoate, gradually heating, and performing a reduced pressure distillation reaction for a certain time to obtain a white lactic acid oligomer; 2), gradually heating the white lactic acid oligomer in a device, and performing the reduced pressure distillation reaction for a certain time until no obvious distillate appears, and collecting the distillate, that is a lactide product, wherein the product is a mixture of D-type lactide and L-type lactide.
Continuous lactide synthesis process and apparatus
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Paragraph 0096; 0097; 0104; 0107; 0112, (2018/10/24)
Lock taken bath used for energy intensive processes the synthesis polylactic acid number are disclosed. In the present invention newly developed SnO2 - SiO2 Nano composite catalyst effect using won - based substrate. The catalyst is fast reaction rates (20 ms) and enabling a 94% yield (highest yield temporal) are used to lock taken number tank. Process of the present invention is rapid kinetics and high yield as well as, the commonly used contrast process has numerous advantages. In addition, the fast reaction rates, its processing amount significantly maxims. In addition, the process of the present invention carried out in atmospheric conditions, the high vacuum conditions (20 mmHg) is operated in a more energy efficient during processes currently used are disclosed. Thus, the process of the present invention can reduce costs associated with polylactic acid number tub. (by machine translation)