SU1145649A1 - METHOD OF OBTAINING ISOPRENE - Google Patents
METHOD OF OBTAINING ISOPRENEInfo
- Publication number
- SU1145649A1 SU1145649A1 SU3488433/04A SU3488433A SU1145649A1 SU 1145649 A1 SU1145649 A1 SU 1145649A1 SU 3488433/04 A SU3488433/04 A SU 3488433/04A SU 3488433 A SU3488433 A SU 3488433A SU 1145649 A1 SU1145649 A1 SU 1145649A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- isoprene
- separation
- temperature
- aqueous
- organic layer
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Способ получения изопрена конденсацией изобутилена с водным раствором формальдегида в присутствии в качестве кислотного катализатора серной кислоты при температуре 85-95C и давлении 18-20 ати с разделением продуктов конденсации на водный и органической слои, с последующим выделением из органического слоя 4,4-диметилдиоксана-1,3 и разложением его до изопрена на кальцийфосфатном катализаторе при температуре 370-390C и переработкой водного слоя, включающий нейтрализацию серной кислоты щелочью, упарку части воды, ректификацию упаренного водного слоя от легкокипящих органических продуктов, ректикулируемых на стадию переработки органического слоя, отличающийся тем, что, с целью повышения выхода изопрена, селективности процесса и ликвидации потерь формальдегида, водный слой перед нейтрализацией обрабатывают изобутиленом и/или триметилкарбинолом при температуре 160-200C в присутствии азотсодержащего соединения гексаметилентетрамина или аммиака в количестве 0,56-0,23 мас.% в водном слое с последующим выделением из образующегося при этом органического слоя изопрена.The method of producing isoprene by condensation of isobutylene with an aqueous solution of formaldehyde in the presence of sulfuric acid as an acid catalyst at a temperature of 85-95 ° C and a pressure of 18-20 atm with separation of condensation products into aqueous and organic layers, followed by separation of 4,4-dimethyldioxane from the organic layer 1.3 and its decomposition to isoprene on the calcium phosphate catalyst at a temperature of 370-390C and processing of the aqueous layer, including neutralization of sulfuric acid with alkali, evaporation of a part of water, rectification of one stripped off of water with Owing to low-boiling organic products, rectified at the organic layer processing stage, characterized in that, to increase isoprene yield, process selectivity and eliminate formaldehyde losses, the aqueous layer is treated with isobutylene and / or trimethylcarbinol at a temperature of 160-200C in the presence of nitrogen-containing compounds before neutralization hexamethylenetetramine or ammonia in the amount of 0.56-0.23% by weight in the aqueous layer, followed by separation of isoprene from the resulting organic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU3488433/04A SU1145649A1 (en) | 1982-05-26 | 1982-05-26 | METHOD OF OBTAINING ISOPRENE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU3488433/04A SU1145649A1 (en) | 1982-05-26 | 1982-05-26 | METHOD OF OBTAINING ISOPRENE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1145649A1 true SU1145649A1 (en) | 1999-12-10 |
Family
ID=60540462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU3488433/04A SU1145649A1 (en) | 1982-05-26 | 1982-05-26 | METHOD OF OBTAINING ISOPRENE |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1145649A1 (en) |
-
1982
- 1982-05-26 SU SU3488433/04A patent/SU1145649A1/en active
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