Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for producing high-content and high-optical purity butyl lactate with two-step method

A technology of butyl lactate and optical purity, applied in chemical instruments and methods, organic chemistry, chemical/physical processes, etc., can solve problems such as butyl lactate not mentioned

Active Publication Date: 2010-12-15
XIAOGAN ESUN NEW MATERIAL
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All the published patents do not mention the process of producing butyl lactate by transesterification with lactide and anhydrous butanol as raw materials

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024]The raw material is purchased lactic acid with a content of 88%, and the raw material lactic acid is vacuum distilled by a falling film evaporator. The temperature of the material in the falling film evaporator is maintained at 60°C, and the vacuum degree is maintained at 8000Pa. The monomer content of the concentrated lactic acid is Above 99%. Transfer 500Kg of concentrated lactic acid into the polycondensation tank through a delivery pump, add zinc lactate as a catalyst at a weight ratio of zinc lactate to lactic acid of 5 / 10000, and raise the material from 80°C to 120°C within 2 hours. The vacuum degree is maintained at 5000Pa, and the whole reaction is carried out with stirring. The viscosity of the lactic acid oligomer is detected by an online viscometer. According to the relationship between viscosity and molecular weight, determine whether its molecular weight is between 1000 and 2500. Inside, the oligomeric lactic acid is transported into the depolymerization tan...

example 2

[0026] 500Kg of concentrated lactic acid is transported into the polycondensation tank through a delivery pump, and zinc oxide is added as a catalyst according to the weight ratio of zinc oxide and lactic acid as 10 / 10000. Within 2.5 hours, the material is raised from 80°C to 120°C. The vacuum degree is maintained at 4000Pa, and the whole reaction is carried out with stirring. The viscosity of the lactic acid oligomer is detected by an online viscometer. According to the relationship between viscosity and molecular weight, its molecular weight is determined to be 1600. The oligomeric lactic acid is transported into the depolymerization tank, and zinc oxide is added as a catalyst according to the weight ratio of zinc oxide to lactic acid of 10 / 10000. The whole reaction is carried out under the condition of stirring, and the material is rapidly heated to 185°C, vacuum The temperature is maintained at 1500Pa. After the lactide vapor obtained continuously is condensed, it is enrich...

example 3

[0028] 500Kg of lactic acid purchased with a content of 95% is transported into the polycondensation tank through a delivery pump, and a mixed catalyst is added in a ratio of 10 / 10000 by weight ratio of the catalyst to lactic acid. The mixed catalyst is zinc oxide, tin oxide and butyl titanate according to A mixture with a weight ratio of 1:1:1. Within 2.5 hours, the material was raised from 80°C to 120°C, the vacuum degree was maintained at 5000Pa ~ 4000Pa, the whole reaction was carried out with stirring, and the viscosity of the lactic acid oligomer was detected by an online viscometer. relationship, confirm that its molecular weight is 2000, and the polycondensation is completed, the oligomeric lactic acid is transported into the depolymerization kettle through the height difference and vacuum pressure difference, and the mixed catalyst is added in a ratio of 8 / 10000 according to the weight ratio of the catalyst to the lactic acid, and the mixed catalyst is oxidation A mix...

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 invention relates to a method for producing high-content and high-optical purity butyl lactate with a two-step method through the ester exchange reaction between lactide and butanol. The method comprises the steps of: adding a catalyst in lactic acid for condensation polymerization to obtain a lactic acid low polymer with the molecular weight of 1000-2500; adding the catalyst to the lactic acid low polymer for depolymerization to obtain a crude lactide product; and refining the crude lactide product, and carrying out total reflux reaction on the refined lactide and anhydrous butanol to obtain the butyl lactate. The invention has simple process, the synthesized butyl lactate has the content above 99.5 percent, and the optical purity reaches above 99 percent.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and specifically relates to a method for producing butyl lactate with high content and high optical purity by using lactide and anhydrous butanol as direct raw materials through a two-step transesterification reaction method. Background technique [0002] Butyl lactate has a special fragrance and is an important fine chemical raw material. Because butyl lactate contains asymmetric carbon atoms, it has two optical isomers and is also an important industrial solvent with optical activity. It can be used as nitrocellulose, cellulose acetate, butyrate resin, kauri ester, Manila resin , rosin, shellac, vinyl resin, paint, etc., and also a high-grade solvent for artificial pearls. It is also used as a plasticizer in other industrial fields, used in asymmetric synthesis to synthesize optically active carboxylic acid esters, and widely used in food, wine, chemical, pharmaceutical and o...

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
IPC IPC(8): C07C69/68C07C67/03B01J31/08B01J27/053
Inventor 杨义浒徐杰
Owner XIAOGAN ESUN NEW MATERIAL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com