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SU106568A1 - The method of obtaining terephthalic acid - Google Patents

The method of obtaining terephthalic acid

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Publication number
SU106568A1
SU106568A1 SU558319A SU558319A SU106568A1 SU 106568 A1 SU106568 A1 SU 106568A1 SU 558319 A SU558319 A SU 558319A SU 558319 A SU558319 A SU 558319A SU 106568 A1 SU106568 A1 SU 106568A1
Authority
SU
USSR - Soviet Union
Prior art keywords
terephthalic acid
catalyst
obtaining terephthalic
xylene glycol
hours
Prior art date
Application number
SU558319A
Other languages
Russian (ru)
Inventor
Р.А. Абрамова
А.И. Куценко
В.И. Любимов
Original Assignee
Р.А. Абрамова
А.И. Куценко
В.И. Любимов
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 Р.А. Абрамова, А.И. Куценко, В.И. Любимов filed Critical Р.А. Абрамова
Priority to SU558319A priority Critical patent/SU106568A1/en
Application granted granted Critical
Publication of SU106568A1 publication Critical patent/SU106568A1/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)

Description

СНоОН + 2NaOH ЮН,С СНрН + 2NaOH НОН/SNOON + 2NaOH YUN, С СНрН + 2NaOH НОН /

NaOOC NcGONa 4Нг CH2ONa + 2Ii2O КаОК,С N aOH/J CZ) f HaOIxa дегидрирующий катализаторNaOOC NcGONa 4Нg CH2ONa + 2Ii2O KaOK, C N aOH / J CZ) f HaOIxa dehydrating catalyst

Предлагаемый .способ позвол ет получать терефта.гевую спслоту с выходом 82,5°/о от теоретического и доста точной степени чистоты (температура плавдиметилового эфира, полученного из нее, 140,5-14Г).The proposed method makes it possible to obtain a tereft-ing spslot with a yield of 82.5 ° / o from the theoretical and sufficient degree of purity (the temperature of the melt-methyl ester obtained from it, 140.5-14 G).

Осуществление способа достигаетс  следующим образом.The implementation of the method is achieved as follows.

Получают натровый алкогол т п-ксиленгликол  путем нагревани  п-ксиленгликол  с едким натром в среде, например, 2-этилгексанола, причем образующа с  по реаклин вода отгон етс  в виде азеотропной смеси. В реакци:)нную ., содержащую алкогол т, внос т едкий натр п катализатор (никель на окиси хрома), массу нагрег ают с обратным холодильником в продолжение 12 часов при температуре 120-180 до прекрагдени  выделени  водорода. Продукт реакции обрабатывают водой и оставшийс  2-этилгексанол отгон ют с вод ным паром. Оставшийс  вод ной раствор отфильтровывают от катализатора и подкисл ют серной кислотой. Выделившиес  кристаллы терефталевой кислоты отжимают на воронке.Sodium p-xylene glycol sodium alcoholate is obtained by heating p-xylene glycol with caustic soda in a medium, for example, 2-ethylhexanol, and the water produced by the reaction is distilled off as an azeotropic mixture. Into the reaction:), containing alcoholate, sodium hydroxide is added to the catalyst (nickel on chromium oxide), the mass is heated under reflux for 12 hours at a temperature of 120-180 until the evolution of hydrogen ceases. The reaction product is treated with water and the remaining 2-ethylhexanol is distilled off with steam. The remaining aqueous solution was filtered from the catalyst and acidified with sulfuric acid. The isolated terephthalic acid crystals are squeezed onto a funnel.

Пример. В х елезный котелок с мешалкой и пр мым холодильником загружают 20 в. ч. п-ксиленгликол , 100 в. ч. 2-этилгексанола и 2,5 в. ч. едкого натра. Воду , образовавшуюс  в результате получени  алкогол та натри , отгон ют при нагревании в виде азеотропной смеси. После этого .пр мой холодильник замен ют на обратный , а в котелок добавл ютExample. A 20-in. Iron kettle with a stirrer and direct fridge is loaded. including n-xylenglycol, 100 volts. including 2-ethylhexanol and 2.5 in. h caustic soda. The water resulting from the preparation of sodium alkoxide is distilled off as a azeotropic mixture when heated. After this, the fresh refrigerator is reversed, and the kettle is added to the kettle.

о в. ч. катал1;зато 1а (промышленный катализатор „Нике.чь на окись хрома) и 12 в. ч. едкого натра. Реакционную массу 11Среме1иивают в течение 12 часон при температуре 130-150 до нрекрагцени  выл .елени  водорода. Продукт )еакпии обрабатывают водой, 2-этилгексанол с в.зд ным паром , оставшийс  водный раствор солей отфильтровывают оч катализатора и подкисл ют серной кислотой . Выде.тивщуюс  терефталевую кислоту отжимают на воронке . Выход -19,0 в. ч. и;1и 82, от теории. Катализатор и 2-этнленгексанол возвращают на с,1едующую операцию.about c. h. catal1; but 1a (industrial catalyst „Nike.ch for chromium oxide”) and 12 volts. h caustic soda. The reaction mass for 11 hours is carried out for 12 hours at a temperature of 130-150 hours before the release of hydrogen. The product is treated with water, 2-ethylhexanol with inhalant vapor, the remaining aqueous salt solution is filtered off with a catalyst and acidified with sulfuric acid. The released terephthalic acid is pressed on the funnel. Exit -19.0 in. hours and; 1 and 82, from the theory. The catalyst and 2-ethnlenhexanol are returned to the second step operation.

Предмет изобретени Subject invention

1.Способ получени  терефталевой кислоты из п-ксиленгликол , о т л и ч а ю щ и и с   тем, ч го, с целью повышени  выхода и получени  чистого продукта, и-ксиленгликоль обрабатьшают едким натром в присутствии своего алкогол та и дегидрирующего катализатора , например, никел , нанесенного на окись хрома.1. A method for producing terephthalic acid from p-xylene glycol, which is designed to increase the yield and obtain a pure product, i-xylene glycol is treated with caustic soda in the presence of its alcoholic and dehydrating catalyst. For example, nickel supported on chromium oxide.

2.Прием выполнени  способа по и. 1, о т л и ч а ю п, и и с   тем, что п-ксиленгликоль примен ют в растворе третичных спиртов или спиртов с заместителем у «-углеродного атома.2. Acceptance of the method according to and. 1, that is, with the fact that p-xylene glycol is used in a solution of tertiary alcohols or alcohols with a substituent at the α-carbon atom.

3.Прием выполнени  способа по пп. 1 и 2, отличающийс  тем, что обработку п-ксиленгликол  провод т при температуре 120- 180°.3. Acceptance of the method according to paragraphs. 1 and 2, characterized in that the treatment of p-xylene glycol is carried out at a temperature of 120-180 °.

SU558319A 1956-09-26 1956-09-26 The method of obtaining terephthalic acid SU106568A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU558319A SU106568A1 (en) 1956-09-26 1956-09-26 The method of obtaining terephthalic acid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU558319A SU106568A1 (en) 1956-09-26 1956-09-26 The method of obtaining terephthalic acid

Publications (1)

Publication Number Publication Date
SU106568A1 true SU106568A1 (en) 1956-11-30

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Family Applications (1)

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SU558319A SU106568A1 (en) 1956-09-26 1956-09-26 The method of obtaining terephthalic acid

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SU (1) SU106568A1 (en)

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