SU126421A1 - Method of producing terephthalic acid dimethyl ester - Google Patents

Method of producing terephthalic acid dimethyl ester

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Publication number
SU126421A1
SU126421A1 SU604754A SU604754A SU126421A1 SU 126421 A1 SU126421 A1 SU 126421A1 SU 604754 A SU604754 A SU 604754A SU 604754 A SU604754 A SU 604754A SU 126421 A1 SU126421 A1 SU 126421A1
Authority
SU
USSR - Soviet Union
Prior art keywords
terephthalic acid
dimethyl ester
acid dimethyl
producing terephthalic
para
Prior art date
Application number
SU604754A
Other languages
Russian (ru)
Inventor
Качман Эвальд
Original Assignee
Имгаузен-Фабрик
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Имгаузен-Фабрик filed Critical Имгаузен-Фабрик
Priority to SU604754A priority Critical patent/SU126421A1/en
Application granted granted Critical
Publication of SU126421A1 publication Critical patent/SU126421A1/en

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Description

Известен способ получени  ди.метилового эфира терефталевой кислоты путем переэтерификации полиэфиров терефталевой кислоты и гликол  метиловым спиртом.A known method for producing terephthalic acid dimethyl ester is obtained by transesterification of terephthalic acid polyesters and glycol with methyl alcohol.

Однако получаемый при этом продукт не обладает достаточной степенью чистоты.However, the resulting product is not sufficiently pure.

Описываемый способ получени  диметилового эфира терефталевой кислоты позвол ет выделить продукт более чистый и дает возможность использовать отходы производства терефталевой кислоты.The described method of producing terephthalic dimethyl ester allows the product to be isolated more purely and makes it possible to use waste products from terephthalic acid.

Особенность способа заключаетс  в том, чго указанные отходы подвергают этерификаций в присутствии продуктов окислени  воздухом параксилола и (или) метилового эфира паратолуиловой кислоты.The peculiarity of the method is that these wastes are esterified in the presence of para-xylene and / or para-toluic acid methyl ester oxidation products.

Пример. 200 г технического продукта окислени  смеси параксилола и метилового эфира паратолуиловой кислоты подвергают этерификаций , под давлением обычным способом метанолом совместно с 50 г технических отходов производства полиэфиров терефталевой кислоты.Example. 200 g of the technical product of the oxidation of a mixture of para-xylene and para-toluic acid methyl ester is subjected to esterification, under pressure in the usual way with methanol together with 50 g of technical waste from the production of terephthalic polyesters.

Из полученного продукта этерификаций выдел ют 128,5 г диметилового эфира терефталевой кислоты с т. пл. 140,3°, в то врем  как при этерификаций исходного продукта без присадки получают только 83 г диметилового эфира терефталевой кислоты.From the obtained esterification product, 128.5 g of terephthalic acid dimethyl ester with a m.p. 140.3 °, while esterifying the starting product without an additive, only 83 g of terephthalic acid dimethyl ester is obtained.

Таким образом, добавка продукта окислени  смеси параксилола и метилового эфира паратолуиловой кислоты позвол ют дополнительно получить 45,5 г диметилового эфира терефталевой кислоты с достаточной степенью чистоты.Thus, the addition of the oxidation product of a mixture of para-xylene and para-toluic acid methyl ester allows an additional 45.5 g of terephthalic acid dimethyl ester to be obtained with a sufficient degree of purity.

Предмет изобретени Subject invention

Способ получеии  диметилового эфира терефталевой кислоты путем переэтерификации полиэфиров терефталевой кислоты и гликол  метиловым спиртом, отличающийс  тем, что, с целью упрощени  процесса, повышени  чистоты конечного продукта и возможности использовани  отходов, последние подвергают этерификации в присутствии продуктов окислени  воздухом параксилола и (или) метилового эфира паратолуиловой кислоты.The method of obtaining dimethyl ester of terephthalic acid by transesterification of terephthalic acid polyesters and glycol with methyl alcohol, characterized in that, in order to simplify the process, increase the purity of the final product and the possibility of using wastes, the latter is subjected to esterification in the presence of para-xylene and / or methyl ether products paratoluic acid.

SU604754A 1958-07-26 1958-07-26 Method of producing terephthalic acid dimethyl ester SU126421A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU604754A SU126421A1 (en) 1958-07-26 1958-07-26 Method of producing terephthalic acid dimethyl ester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU604754A SU126421A1 (en) 1958-07-26 1958-07-26 Method of producing terephthalic acid dimethyl ester

Publications (1)

Publication Number Publication Date
SU126421A1 true SU126421A1 (en) 1959-11-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU604754A SU126421A1 (en) 1958-07-26 1958-07-26 Method of producing terephthalic acid dimethyl ester

Country Status (1)

Country Link
SU (1) SU126421A1 (en)

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