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SU405864A1 - METHOD FOR OBTAINING METACRYLIC ACID - Google Patents

METHOD FOR OBTAINING METACRYLIC ACID

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Publication number
SU405864A1
SU405864A1 SU1716543A SU1716543A SU405864A1 SU 405864 A1 SU405864 A1 SU 405864A1 SU 1716543 A SU1716543 A SU 1716543A SU 1716543 A SU1716543 A SU 1716543A SU 405864 A1 SU405864 A1 SU 405864A1
Authority
SU
USSR - Soviet Union
Prior art keywords
obtaining
mma
yield
metacrylic acid
mac
Prior art date
Application number
SU1716543A
Other languages
Russian (ru)
Inventor
Л. А. Морозов Р. П. Иванова В. В. Лепилина
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 filed Critical
Priority to SU1716543A priority Critical patent/SU405864A1/en
Application granted granted Critical
Publication of SU405864A1 publication Critical patent/SU405864A1/en

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

Description

II

Изобретение относитс  к способу полу-чени  мета1криловой кислоты высокой чистоты, .наход щей ширакое применение в хи.мической и иолиме.рной Промышленности.The invention relates to a process for the preparation of high purity methacrylic acid, which is applicable to widespread use in the chemical and polymer industry.

Известен способ пол чени  метакриловой кислоты омылеНИем .метил-метакрилата (ММА) водным раствором .щело и, -вз той в избы1 ке, с последующим отодкислением сер«ой кислотой и лерегавкой полученной .«ета.К1риловой 1К1И1СЛОТЫ (МАК). Выход сьирото продукта 64%, выход чистого продукта 52%..The known method for the preparation of methacrylic acid by the hydration of methyl methacrylate (MMA) with an aqueous solution of alkali and, in excess, followed by acidification with sulfuric acid and lerebavka obtained by ethe. Cyrilic 1K1I1 SLOT (MAC). Yield of product Siro 64%, the yield of pure product 52% ..

Недостат1ком известного способа  вл етс  низкий выход чистого продукта, так как МАК образует азеотрои с водой.A disadvantage of the known method is the low yield of the pure product, since MAA forms azeotroi with water.

С целью (повышени  выхода целевого продукта исходный чметилметакрилат берут в 0,25-1,0-мольном из,бытке от стехиометрии.In order to (increase the yield of the target product, the initial chmethyl methacrylate is taken in 0.25-1.0 molar from, the cattle from stoichiometry.

Выход сырого продукта 93-98%, выход чистого тродукта 90-95%. Содержание основного вещества ие менее 99,9%. При использоваиии избытка ММА он не омыл етс  до конца.The yield of crude product 93-98%, the yield of pure products 90-95%. Content of the main substance is not less than 99.9%. When using excess MMA, it is not washed completely.

Избыто1К ММА обеспечивает более полное выделение МАК из водного сло  и более: полное удаление воды .при лерегонке сырого продукта , так как ММА образует азеотроп с водой (86% ММА 1И 14% воды), .кий щей при более НИзкой температуре (83°С), чем азеотрол МАК с водой (99°С).The excess of 1K MMA provides a more complete isolation of MAC from the aqueous layer and more: the complete removal of water during the distillation of the crude product, since MMA forms an azeotrope with water (86% MMA 1 and 14% water), which occurs at a lower temperature (83 ° С ) than azeotrol MAC with water (99 ° C).

Отпон ММА используют в повторном синтезе без дополнительной очистки. Процесс может быть  бпрерьшным.Otpon MMA is used in re-synthesis without further purification. The process may be prioritized.

10ten

1515

2020

Прим,ер. В реактор загружают 250 г ММА, стабилизированного 0,08 г гидрохинона, при перемешивании добавл ют 800 г 10%-1ногоExample. 250 g of MMA stabilized with 0.08 g of hydroquinone are loaded into the reactor, and 800 g of 10% -1 is added with stirring.

25 раствора NaOH, выдерживают 1 час без нагреваии , 1прили(в.ают 254 г серной (КИСЛОТЫ, пе1ремвшивают 20 мин, МАК в смеси с .ММА отдел ют от водного раствора де- ,кантацией и МАК выдел ют в чистом виде25 NaOH solution, incubated for 1 hour without heating, 1prily (254 g sulfuric acid is added (ACIDS, held for 20 minutes, MAK mixed with MMA is separated from the aqueous solution by de-cantation and MAC is isolated in pure form

30 путем ректифи кации. Получают 156,5 г (91,0%) 3430 by rectification. 156.5 g (91.0%) are obtained 34

МАК, содержащей 99,9%ooHOiBHoro вещества. омылеанем метилметакрилата водным раствоВ таблице приведены результаты синтеза МАК ром щелочи с последующим подкислением по стади м.серной кислотой и перегонкой выделенногоMAC containing 99.9% ooHOiBHoro substance. The solution of methyl methacrylate with an aqueous solution is shown. The table shows the results of the synthesis of MAC rum alkali, followed by acidification according to the m-sulfuric acid stage and the distillation of the isolated

П р е д .1 е т « 3 о б р е т е н и  5 повышени  выхода цел1евого продукта, исходСпособ получени  Метакриловой кислоты пом избытке от стехио 1етри«.Preferably, 1 e о 3 o b e te n and 5 increase the yield of the desired product, from the method of producing methacrylic acid from excess stoichio 1 ″.

405864 405864

продукта, отличающийс  тем, что, с цельюproduct, characterized in that

ный метилметакрилат берут в 0,25-1,0-.мольNy methyl methacrylate is taken in 0,25-1,0-mol.

SU1716543A 1971-11-19 1971-11-19 METHOD FOR OBTAINING METACRYLIC ACID SU405864A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU1716543A SU405864A1 (en) 1971-11-19 1971-11-19 METHOD FOR OBTAINING METACRYLIC ACID

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU1716543A SU405864A1 (en) 1971-11-19 1971-11-19 METHOD FOR OBTAINING METACRYLIC ACID

Publications (1)

Publication Number Publication Date
SU405864A1 true SU405864A1 (en) 1973-11-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
SU1716543A SU405864A1 (en) 1971-11-19 1971-11-19 METHOD FOR OBTAINING METACRYLIC ACID

Country Status (1)

Country Link
SU (1) SU405864A1 (en)

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