ПОЛУЧЕНИЕ ОЛИГОМЕРА МОЛОЧНОЙ КИСЛОТЫ

Translated title of the contribution: Preparation of lactic acidoligomer

Research output: Contribution to journalArticle

Abstract

The process of obtaining of lactic acid oligomer as by-product for synthesis of biodegrada-ble polylactide was investigated. Synthesis of oligomer was carried out by azeotropic distillation of water. Aromatic hydrocarbons such as toluene, chlorobenzene, bromobenzene and o-dichloroben-zene were used. They form heteroazeotropes. This allowed to control the volume of distilled water. The time of obtaining of oligomer of lactic acid in presence aromatic hydrocarbons and without them was compare in the article. The reaction of obtaining of oligomer was carried out in a rotary vacuum evaporator and in laboratory distillation installation in presence of catalyst (ZnO in the amount of 1.5% by weight) for reaction assessment. It was shown that the using of azeotropic dis-tillation of water from reaction mass allow to reduce the time of oligomer synthesis compared to standard distillation of water from the lactic acid solution. It implements by reducing of viscosity of reaction mass that improves heat and mass transfer in the reactor. These factors contribute to increase rate of distillation of solution water and water which release in the process of polyconden-sation of lactic acid. The oligomer yield also increases. The actual control of concentrating of the aqueous solution of lactic acid and the oligomer obtaining reaction carried out according to the rate of distillation of the water from the reactor. Also the control was carried out by changing the molecular weight of the oligomer. The molecular weight of the oligomers obtained was determined by gel permeation chromatography. It reached 1600 g/mol. Lactic acid oligomer of a linear struc-ture was obtained under these conditions. IR spectra of the oligomer of lactic acid indicate the simultaneous process of concentration of the lactic acid solution and polycondensation of lactic acid.

Original languageRussian
Pages (from-to)23-28
Number of pages6
JournalIzvestiya Vysshikh Uchebnykh Zavedenii, Seriya Khimiya i Khimicheskaya Tekhnologiya
Volume62
Issue number6
DOIs
Publication statusPublished - 1 Jan 2019

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Oligomers
Lactic acid
Lactic Acid
Distillation
Water
Aromatic Hydrocarbons
Aromatic hydrocarbons
Milk
Molecular weight
Toluene
Gel permeation chromatography
Evaporators
Polycondensation
Byproducts
Mass transfer
Vacuum
Viscosity
Heat transfer
Catalysts

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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title = "ПОЛУЧЕНИЕ ОЛИГОМЕРА МОЛОЧНОЙ КИСЛОТЫ",
abstract = "The process of obtaining of lactic acid oligomer as by-product for synthesis of biodegrada-ble polylactide was investigated. Synthesis of oligomer was carried out by azeotropic distillation of water. Aromatic hydrocarbons such as toluene, chlorobenzene, bromobenzene and o-dichloroben-zene were used. They form heteroazeotropes. This allowed to control the volume of distilled water. The time of obtaining of oligomer of lactic acid in presence aromatic hydrocarbons and without them was compare in the article. The reaction of obtaining of oligomer was carried out in a rotary vacuum evaporator and in laboratory distillation installation in presence of catalyst (ZnO in the amount of 1.5{\%} by weight) for reaction assessment. It was shown that the using of azeotropic dis-tillation of water from reaction mass allow to reduce the time of oligomer synthesis compared to standard distillation of water from the lactic acid solution. It implements by reducing of viscosity of reaction mass that improves heat and mass transfer in the reactor. These factors contribute to increase rate of distillation of solution water and water which release in the process of polyconden-sation of lactic acid. The oligomer yield also increases. The actual control of concentrating of the aqueous solution of lactic acid and the oligomer obtaining reaction carried out according to the rate of distillation of the water from the reactor. Also the control was carried out by changing the molecular weight of the oligomer. The molecular weight of the oligomers obtained was determined by gel permeation chromatography. It reached 1600 g/mol. Lactic acid oligomer of a linear struc-ture was obtained under these conditions. IR spectra of the oligomer of lactic acid indicate the simultaneous process of concentration of the lactic acid solution and polycondensation of lactic acid.",
keywords = "Biodegradable polymers, Lactic acid, Oligolacticacid, Polylacticacid",
author = "Glotova, {Valentina N.} and Ushakova, {Tatyana V.} and Novikov, {Viktor T.}",
year = "2019",
month = "1",
day = "1",
doi = "10.6060/ivkkt.20196206.5859",
language = "Русский",
volume = "62",
pages = "23--28",
journal = "IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA",
issn = "0579-2991",
publisher = "Ivanovo State University of Chemistry and Technology",
number = "6",

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TY - JOUR

T1 - ПОЛУЧЕНИЕ ОЛИГОМЕРА МОЛОЧНОЙ КИСЛОТЫ

AU - Glotova, Valentina N.

AU - Ushakova, Tatyana V.

AU - Novikov, Viktor T.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The process of obtaining of lactic acid oligomer as by-product for synthesis of biodegrada-ble polylactide was investigated. Synthesis of oligomer was carried out by azeotropic distillation of water. Aromatic hydrocarbons such as toluene, chlorobenzene, bromobenzene and o-dichloroben-zene were used. They form heteroazeotropes. This allowed to control the volume of distilled water. The time of obtaining of oligomer of lactic acid in presence aromatic hydrocarbons and without them was compare in the article. The reaction of obtaining of oligomer was carried out in a rotary vacuum evaporator and in laboratory distillation installation in presence of catalyst (ZnO in the amount of 1.5% by weight) for reaction assessment. It was shown that the using of azeotropic dis-tillation of water from reaction mass allow to reduce the time of oligomer synthesis compared to standard distillation of water from the lactic acid solution. It implements by reducing of viscosity of reaction mass that improves heat and mass transfer in the reactor. These factors contribute to increase rate of distillation of solution water and water which release in the process of polyconden-sation of lactic acid. The oligomer yield also increases. The actual control of concentrating of the aqueous solution of lactic acid and the oligomer obtaining reaction carried out according to the rate of distillation of the water from the reactor. Also the control was carried out by changing the molecular weight of the oligomer. The molecular weight of the oligomers obtained was determined by gel permeation chromatography. It reached 1600 g/mol. Lactic acid oligomer of a linear struc-ture was obtained under these conditions. IR spectra of the oligomer of lactic acid indicate the simultaneous process of concentration of the lactic acid solution and polycondensation of lactic acid.

AB - The process of obtaining of lactic acid oligomer as by-product for synthesis of biodegrada-ble polylactide was investigated. Synthesis of oligomer was carried out by azeotropic distillation of water. Aromatic hydrocarbons such as toluene, chlorobenzene, bromobenzene and o-dichloroben-zene were used. They form heteroazeotropes. This allowed to control the volume of distilled water. The time of obtaining of oligomer of lactic acid in presence aromatic hydrocarbons and without them was compare in the article. The reaction of obtaining of oligomer was carried out in a rotary vacuum evaporator and in laboratory distillation installation in presence of catalyst (ZnO in the amount of 1.5% by weight) for reaction assessment. It was shown that the using of azeotropic dis-tillation of water from reaction mass allow to reduce the time of oligomer synthesis compared to standard distillation of water from the lactic acid solution. It implements by reducing of viscosity of reaction mass that improves heat and mass transfer in the reactor. These factors contribute to increase rate of distillation of solution water and water which release in the process of polyconden-sation of lactic acid. The oligomer yield also increases. The actual control of concentrating of the aqueous solution of lactic acid and the oligomer obtaining reaction carried out according to the rate of distillation of the water from the reactor. Also the control was carried out by changing the molecular weight of the oligomer. The molecular weight of the oligomers obtained was determined by gel permeation chromatography. It reached 1600 g/mol. Lactic acid oligomer of a linear struc-ture was obtained under these conditions. IR spectra of the oligomer of lactic acid indicate the simultaneous process of concentration of the lactic acid solution and polycondensation of lactic acid.

KW - Biodegradable polymers

KW - Lactic acid

KW - Oligolacticacid

KW - Polylacticacid

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U2 - 10.6060/ivkkt.20196206.5859

DO - 10.6060/ivkkt.20196206.5859

M3 - Статья

VL - 62

SP - 23

EP - 28

JO - IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA

JF - IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA

SN - 0579-2991

IS - 6

ER -