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

Continuous production process of ultra-pure methyl lactate

A methyl lactate and production process technology, applied in the continuous production process of ultra-high-purity methyl lactate, can solve the problems of complex reaction process and low lactic acid utilization rate, and achieve high product purity, high reactant utilization rate, and design reasonable effect

Active Publication Date: 2021-11-05
FUZHOU UNIV +1
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of methyl lactate obtained by this method is above 99.5%, and the optical purity can reach above 99%, but this process involves lactic acid polycondensation and depolymerization, the reaction process is complicated, and the utilization rate of lactic acid is low

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
  • Continuous production process of ultra-pure methyl lactate
  • Continuous production process of ultra-pure methyl lactate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment one: if figure 1 As shown, the production process includes the following steps:

[0052] 1. The raw material lactic acid is sent to pretreatment tower 1 at a rate of 1750kg / h for vacuum distillation, which contains 72.03% lactic acid, 17.07% water and 10.9% polylactic acid; pretreatment tower 1 adopts Sulzer Mellapak structured packing, theoretical board The number is 30, the tower top pressure is 2 KPa, the temperature is 17.5 ° C, the reflux ratio is 4, and the theoretical plate number from the feed position to the tower kettle is 15; is 1480.89kg / h), in which the water content is 2%, the lactic acid content is 85.12%, and the polylactic acid content is 12.88%, which is sent to the fixed bed reactor 2.

[0053] 2. Methanol is passed into the first fixed-bed reactor 2 filled with acidic ion exchange resin HND-8 at a flow rate of 1792kg / h, the alkyd-acid ratio is 4:1, the reaction temperature is 70°C, and the residence time is 30 min. The chemical reaction ...

Embodiment 2

[0060] Embodiment two: if figure 2 As shown, the production process includes the following steps:

[0061] 1. The raw material lactic acid is sent to the pretreatment tower 8 at a rate of 1750 kg / h for vacuum distillation, which contains 72.03% lactic acid, 17.07% water and 10.9% polylactic acid. Pretreatment tower 8 adopts Sulzer Mellapak structured packing, the number of theoretical plates is 30, the pressure at the top of the tower is 2 KPa, the temperature is 17.5°C, the reflux ratio is 4, and the number of theoretical plates from the feed position to the bottom of the tower is 15. The dehydrated lactic acid extracted from the pretreatment tower tank (the output rate is 1480.89 kg / h), in which the water content is 2%, the lactic acid content is 85.12%, and the polylactic acid content is 12.88%, is sent to the first fixed-bed reactor 9.

[0062] 2. Methanol is passed into the first fixed-bed reactor 9 filled with acidic ion exchange resin HND-8 at a flow rate of 1792 kg / h...

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 continuous production process of ultra-pure methyl lactate, which comprises the steps of lactic acid pretreatment, methyl lactate synthesis, light and heavy component separation, methanol separation and recovery, water removal, impurity removal, refining and the like, ultra-pure methyl lactate is produced by using a technology of combining a fixed bed reactor and rectification separation, the product purity is greater than 99.99%, and the unreacted lactic acid and methanol can be recycled. The process solves the problems of low conversion rate, equipment corrosion, environmental pollution and the like in the existing esterification reaction process, realizes continuous production of methyl lactate, and has the advantages of high conversion rate, high reactant utilization rate, no pollution and high product purity.

Description

Technical field: [0001] The invention belongs to the technical field of organic chemical industry, in particular to a continuous production process of ultra-high-purity methyl lactate. Background technique: [0002] Methyl lactate is a hydroxycarboxylate compound, a colorless liquid, non-toxic, non-volatile, good solubility, and biodegradable. It is a "green solvent" with great development value and application prospects. ", are widely used in medicine, resin coatings, adhesives, cleaning agents, dry cleaning fluids and printing inks and other fields. Methyl lactate can be used alone or as a formula for cleaning solvents. It is used for cleaning various precision machinery and cleaning before surface coating. It is a substitute for ODS (Ozone Depleting Substance) solvent-based cleaning agent. Widely used in the electronics industry, it can be used to clean various optical discs, liquid crystal displays, magnetic heads, chips, circuit board substrates, and modules; it can al...

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): C07C67/08C07C67/54C07C69/68
CPCC07C67/08C07C67/54C07C69/68
Inventor 黄智贤陈宇钱贵菊邱挺刘征叶长燊钱俊王红星喻军
Owner FUZHOU UNIV
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