SU438265A2 - Process for producing 4,4-dimethyldioxane - Google Patents

Process for producing 4,4-dimethyldioxane Download PDF

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Publication number
SU438265A2
SU438265A2 SU721777284A SU1777284A SU438265A2 SU 438265 A2 SU438265 A2 SU 438265A2 SU 721777284 A SU721777284 A SU 721777284A SU 1777284 A SU1777284 A SU 1777284A SU 438265 A2 SU438265 A2 SU 438265A2
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SU
USSR - Soviet Union
Prior art keywords
dimethyldioxane
saturation
carried out
producing
products
Prior art date
Application number
SU721777284A
Other languages
Russian (ru)
Inventor
А.П. Троицкий
С.К. Огородников
Г.С. Идлис
Ю.М. Блажин
В.М. Закошанский
М.С. Варданян
В.А. Газин
Б.С. Короткевич
Н.А. Скачкова
Л.Д. Пин
Л.М. Шварев
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Предприятие П/Я Р-6913
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Priority to SU721777284A priority Critical patent/SU438265A2/en
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Publication of SU438265A2 publication Critical patent/SU438265A2/en

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Description

Ш т,1.W t, 1.

бочных продуктов и воды помещают в скруббер, в нижнюю часть которого подают газообразный формальдегид, содержащий 90% СН2О. Скорость подачи газа регулируют так, чтобы исключить проскок формальдегида. На выходе из скруббера устанавливают ловушку, залитую сол нокислым гидроксиламином.The by-products and water are placed in a scrubber, in the lower part of which formaldehyde gas is fed containing 90% CH2O. The gas feed rate is adjusted so as to eliminate formaldehyde slip. At the exit from the scrubber, a trap filled with hydroxylamine hydrochloride is placed.

Насыщение водной жидкости ведут при атмосферном давлении. Газ подают в скруббер при 103-105°С. Через 130 мин концентраци  формальдегида в водном слое достигает 35,9 вес. %, а вес насыщенной жидкости возрастает до 360 г.Saturation of the aqueous liquid is carried out at atmospheric pressure. The gas is fed to the scrubber at 103-105 ° C. After 130 min, the formaldehyde concentration in the aqueous layer reaches 35.9 wt. %, and the weight of a saturated liquid increases to 360 g.

В результате насыщени  количество высококип щих побочных продуктов в водной жидкости увеличиваетс  до 26,4 г,т.е. на 14,8 отн. %. Количество диметилдиоксана при этом уменьщаетс  до 14,3 г.As a result of saturation, the amount of high boiling point by-products in the aqueous liquid increases to 26.4 g, i.e. by 14.8 rel. % The amount of dimethyldioxane decreases to 14.3 g.

Пример 2. 250 г водной реакционной жидкости синтеза диметилдиоксана состава , указанного в примере 1, насыщают в скруббере газообразным формальдегидом в течение 115 мин до достил ени  концентрации формальдегида в водном слое, равнойExample 2. 250 g of the aqueous reaction liquid for the synthesis of dimethyldioxane of the composition specified in example 1 is saturated in the scrubber with gaseous formaldehyde for 115 minutes until the concentration of formaldehyde in the aqueous layer is equal to

36,1%. Насыщение ведут при давлении, равном 220-240 мм рт. ст.36.1%. Saturation is carried out at a pressure of 220-240 mm Hg. Art.

Формальдегид подают при температуре на входе в скруббер 70-75°С.Formaldehyde is served at the inlet temperature of the scrubber 70-75 ° C.

В результате оиыта количество высококип щих побочных продуктов и диметилдиоксана в насыщенном водном слое реакционной жидкости не измен етс .As a result, the amount of high boiling point by-products and dimethyldioxane in the saturated aqueous layer of the reaction liquid does not change.

Claims (2)

1.Способ получени  4,4-диметилдиоксана-1 ,3 по основному авт. св. № 296416, отличающийс  тем, что, с целью уменьшени  образовани  высококип щих побочных продуктов и повыи1ени  производительности процесса, насыщение рециркулирующего водного сло  реакционной жидкости синтеза 4,4-днметилдиоксана-1,3 высококонцентрированным газообразным формальдегидом ведут при пониженном давлении .1. The method of obtaining 4,4-dimethyldioxane-1, 3 according to the main author. St. No. 296416, characterized in that, in order to reduce the formation of high-boiling by-products and increase the productivity of the process, saturation of the recycled aqueous layer of the synthesis liquid with 4,4-dn-methyl dioxane-1,3 with highly concentrated formaldehyde gas is carried out under reduced pressure. 2.Способ по п. 1, отличающийс  тем, что насыщение ведут при давлении2. A method according to claim 1, characterized in that the saturation is carried out at a pressure 100-250 мм рт. ст.100-250 mm Hg. Art.
SU721777284A 1972-04-21 1972-04-21 Process for producing 4,4-dimethyldioxane SU438265A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SU721777284A SU438265A2 (en) 1972-04-21 1972-04-21 Process for producing 4,4-dimethyldioxane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU721777284A SU438265A2 (en) 1972-04-21 1972-04-21 Process for producing 4,4-dimethyldioxane

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
SU296416 Addition

Publications (1)

Publication Number Publication Date
SU438265A2 true SU438265A2 (en) 1982-09-23

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SU721777284A SU438265A2 (en) 1972-04-21 1972-04-21 Process for producing 4,4-dimethyldioxane

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SU (1) SU438265A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458922C2 (en) * 2010-05-11 2012-08-20 Общество с ограниченной ответственностью "Научно-производственное объединение ЕВРОХИМ" Method of producing 4,4-dimethyl-1,3-dioxane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458922C2 (en) * 2010-05-11 2012-08-20 Общество с ограниченной ответственностью "Научно-производственное объединение ЕВРОХИМ" Method of producing 4,4-dimethyl-1,3-dioxane

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