SU679525A1 - Silica gel treatment method - Google Patents
Silica gel treatment methodInfo
- Publication number
- SU679525A1 SU679525A1 SU762425023A SU2425023A SU679525A1 SU 679525 A1 SU679525 A1 SU 679525A1 SU 762425023 A SU762425023 A SU 762425023A SU 2425023 A SU2425023 A SU 2425023A SU 679525 A1 SU679525 A1 SU 679525A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- silica gel
- treatment method
- gel treatment
- vacuum
- air
- Prior art date
Links
Landscapes
- Silicon Compounds (AREA)
Description
Изобретение относитс к способам термической обработки силикагел и может быть использовано дл глубокой осушки мономеров и различных органических жидкостей . Известен способ термической обработ ки си икагел нагревани его в вакууме при 5ОО С в течение 36 ч и давле ™ 1 НИИ 10 -10 мм рт. ст. LIJ. Недостатком данного способа вл етс неудовлетворительна влагопоглощающа способность силикагел , котора оцениваетс по величине полимеризащш или прививки осушенного им мономера (так радиационна прививка стирола составл ет всего лишь 10-12%), Целью изобретени вл етс повышение влагопоглощающей способности силикагел Поставленна цель достигаетс путем предварительного нагревани си икагел на воздухе при 700-850 С в течение 67 ч, а затем в вакууме при давлении рт. ст. и температуре 5ОО С в течение 15-2О ч. Отличительными признаками способа вл етс предварительна обработка силикагел на воздухе при температуре 7ОО85О С, а также то, что нагревание в вакууме осуществл ют в течение 1 5-2О ч. При такой обработке из силикагел удал етс вс физически адсорбированна (молекул рна ) вода и больша часть хемосорбирова1гаой воды: удал ютс все внутриглобул рные ОН-грутты и значительна часть поверхностных ОН-групп (остаетс около 1,5 54 ОН-св зей на 100 А поверхности силикагел ). Пример 1. Силнкагель марки кем 6п с размером частиц 0,25-0,5 мм прокаливают на воздухе в муфельной печи при 70О°С в течение 6 ч, а затем нагревают в вакууме при давлении 1О мм СТ. в течение 15ч при температуре 500°С. Обработанный таким образом силикагель примен ют дл глубокой осушки мономеров: винил-н-бутилового эфира, изобутилвинилового эфира, oLr-метилстирола , изобутилена и стирола.The invention relates to methods for the heat treatment of silica gel and can be used for the deep drying of monomers and various organic liquids. The known method of heat treatment of silica gel is heating it in vacuum at 5OO C for 36 h and pressure ™ 1 of the Scientific Research Institute 10 -10 mm Hg. Art. LIJ. The disadvantage of this method is the unsatisfactory absorption of silica gel, which is estimated by the amount of polymerization or grafting of the monomer dried by it (so radiation grafting of styrene is only 10-12%). The aim of the invention is to increase the moisture absorption capacity of silica gel. Icagel in air at 700-850 C for 67 h, and then in vacuum at a pressure of Hg. Art. and a temperature of 5OO C for 15-2O h. A distinctive feature of the method is the pretreatment of silica gel in air at a temperature of 7OO85O C, as well as the fact that heating in vacuum is carried out for 1 5-2O h. Physically adsorbed (molecular) water and most of the chemisorbing water are completely removed: all intra-globular OH-grubs are removed and a large part of the surface OH-groups (about 1.5 54 OH-bonds per 100 A of silica gel surface remain). Example 1. Silnkagel brand someone 6p with a particle size of 0.25-0.5 mm calcined in air in a muffle furnace at 70O ° C for 6 h, and then heated in vacuum at a pressure of 1O mm ST. for 15 hours at a temperature of 500 ° C. The silica gel thus treated is used for the deep drying of the monomers: vinyl n-butyl ether, isobutyl vinyl ether, oLr-methylstyrene, isobutylene, and styrene.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU762425023A SU679525A1 (en) | 1976-12-01 | 1976-12-01 | Silica gel treatment method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU762425023A SU679525A1 (en) | 1976-12-01 | 1976-12-01 | Silica gel treatment method |
Publications (1)
Publication Number | Publication Date |
---|---|
SU679525A1 true SU679525A1 (en) | 1979-08-15 |
Family
ID=20684718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU762425023A SU679525A1 (en) | 1976-12-01 | 1976-12-01 | Silica gel treatment method |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU679525A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5650129A (en) * | 1994-05-03 | 1997-07-22 | Korea Atomic Energy Research Institute | Light weight silica balls with a dense outer layer and method of making the same |
-
1976
- 1976-12-01 SU SU762425023A patent/SU679525A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5650129A (en) * | 1994-05-03 | 1997-07-22 | Korea Atomic Energy Research Institute | Light weight silica balls with a dense outer layer and method of making the same |
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