Supercharge Your Innovation With Domain-Expert AI Agents!

Method for producing lactide from lactic acid

一种丙交酯、乳酸的技术，应用在有机化学等方向，能够解决不清楚成本效益等问题

Inactive Publication Date: 2016-09-07
HYUNDAI MOTOR CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, even with the aforementioned advances, it remains unclear whether these methods can produce high-yield and cost-effective processes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing lactide from lactic acid
  • Method for producing lactide from lactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1，2

[0040] The chamber-scale reactor used in the examples was figure 1 In the example description. The reactor is about 5 cm wide and about 5 cm high. A transfer line is attached to the top of the reactor.

[0041] The bottom part of the reactor is filled with liquid D-type lactic acid, and a zinc oxide catalyst is injected into the liquid lactic acid. The reactor was equipped with a three-way valve at the bottom to supply liquid lactic acid to the reactor. Nitrogen carrier gas was also supplied to the reactor through a line connected to a tee. The entire assembly was placed in a heating mantle and heated to maintain the desired reactor temperature. Lactide and other by-products produced by the catalyst reaction in the reactor are evaporated.

[0042] The catalyst added to the liquid lactic acid was zinc oxide (ZnO), which was added in amounts of 0.5% by weight (Example 1) and 1.0% by weight (Example 2), based on the liquid lactic acid. Subsequently, the unreacted lactic aci...

Embodiment 3

[0050] 3000 g of D-type lactide produced in Example 1 was introduced into a reactor equipped with a stirrer, and heated to 300° C. under a nitrogen atmosphere. 0.9 g of stannous octoate and 1.8 g of 1-hexanol were introduced thereinto. Subsequently, the reaction was performed at a temperature of 180° C. for 2 hours, and the polymer was recovered from the reactor. The crushing process was carried out to obtain D-type polylactic acid with a weight average molecular weight of about 150,000 g / mol.

[0051] Invention effect

[0052] The method of the present invention has the advantage that compared with the conventional production method, D-lactide can be obtained through a simple method with high yield. Therefore, the production cost of finally obtaining D-type polylactic acid from D-type lactide can be reduced.

[0053] The method of the present invention also has the advantage that the asymmetric carbon atoms in the product lactide are mainly in the same absolute configura...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention provides a method for producing D-type lactide from liquid D-type lactic acid, and a method for producing D-type polylactic acid with a weight average molecular weight of about 50,000-20,000 g / mol from the produced D-type lactide. The advantage of the method of the present invention is that, compared with conventional manufacturing methods, D-type lactide can be obtained by a simple method with a high yield. Therefore, the manufacturing cost of finally obtaining D-type polylactic acid from D-type lactide can be reduced.

Description

technical field [0001] The present invention relates to a method for producing high-yield lactide from D-lactic acid monomer produced by fermentation. Background technique [0002] From the 20th century to the present, rapid industrialization has fueled the consumption of fossil fuels, especially oil, and the growing demand for oil is driven by rapid industrialization and population growth. However, petroleum is not renewable, but a natural resource with finite reserves that is quickly depleted. In addition, carbon dioxide emissions through the combustion of fossil fuels appear to be a major cause of global warming. In this regard, improvements in energy efficiency and interest in alternatives to petroleum have increased to reduce carbon dioxide emissions. [0003] Plant-derived biomass polymers (biomass polymers) are prepared chemically or biologically from renewable plant resources such as corn, soybeans, sugar cane, and wood, and have a lower environmental impact by red...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07D319/12
CPCC07D319/12C07C59/08
Inventor 洪采焕金时焕徐知延韩道锡
Owner HYUNDAI MOTOR CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com