SU189819A1 - METHOD OF OBTAINING 1,4-DIMETHYL-2,5-DIISOPROPYL BENZENE - Google Patents
METHOD OF OBTAINING 1,4-DIMETHYL-2,5-DIISOPROPYL BENZENEInfo
- Publication number
- SU189819A1 SU189819A1 SU1043953A SU1043953A SU189819A1 SU 189819 A1 SU189819 A1 SU 189819A1 SU 1043953 A SU1043953 A SU 1043953A SU 1043953 A SU1043953 A SU 1043953A SU 189819 A1 SU189819 A1 SU 189819A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- dimethyl
- obtaining
- diisopropyl benzene
- diisopropylbenzene
- propylene
- Prior art date
Links
- MBEBPYJMHLBHDJ-UHFFFAOYSA-N 1,4-dimethyl-2,5-di(propan-2-yl)benzene Chemical compound CC(C)C1=CC(C)=C(C(C)C)C=C1C MBEBPYJMHLBHDJ-UHFFFAOYSA-N 0.000 title description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K Aluminium chloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 6
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 238000005804 alkylation reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000008096 xylene Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Description
Снбсоб получени 1,4-диметил-2,5-диизопропилбензола алкилированием «-ксилола пропиленом в присутствии различных катализаторов , например хлористого алюмини , известен. При этом процесс ведут при 20-95°С и выход продукта составл ет 60«/о от теор.It is known to synthesize 1,4-dimethyl-2,5-diisopropylbenzene by alkylation of α-xylene with propylene in the presence of various catalysts, for example aluminum chloride. The process is carried out at 20-95 ° C and the product yield is 60 "/ o from the theory.
Предлагаемый способ отличаетс от известного тем, что процесс алкилировани ведут при температуре около 0°С, что позвол ет получать 1,4-диметил-2,5-диизонропилбензол с выходом до 920/0 от теор.The proposed method differs from the known one in that the alkylation process is carried out at a temperature of about 0 ° C, which makes it possible to obtain 1,4-dimethyl-2,5-diisopropylbenzene with a yield of up to 920/0 from the theory.
Пример. 2 моль {212,6 г) га-ксилола и 0,2 моль (26,6 г) хлористого алюмини загружают в колбу емкостью 1 л с мешалкой, обратным холодильником и барботером дл подачи газа и помещают в вод ную баню с температурой О-2°С. При этой температуре и сильном перемешивании подают 4 моль (90- 95 л) 96-980/о-ного сухого пропилена со скоростью, равной скорости его поглощени Example. 2 mol {212.6 g) ha-xylene and 0.2 mol (26.6 g) of aluminum chloride are loaded into a 1 liter flask with a stirrer, a reflux condenser and a gas supply sparger and placed in a water bath at a temperature O- 2 ° C. At this temperature and vigorous stirring, 4 mol (90-95 l) of 96-980 /% dry propylene are fed at a rate equal to the rate of its absorption.
реакционной массой. Процесс длитс 1,5- 2 час. После окончани подачи пропилена реакционную массу промывают гор чей водой (60-80°С), охлаждают до 2-5°С, кристаллическую часть отфильтровывают, фильтрат перегон ют из колбы Вюрца с отбором фракции 240-250°С и снова охлаждают. Из алкилата выдел ют 352 г кристаллического 1,4-диметил-2 ,5-диизопропилбензола, что составл ет 92,7(1/0 от теории.reaction mass. The process takes 1.5-2 hours. After the end of the supply of propylene, the reaction mass is washed with hot water (60-80 ° C), cooled to 2-5 ° C, the crystalline portion is filtered, the filtrate is distilled from a Würz flask with a fraction 240-250 ° C and cooled again. From the alkylate, 352 g of crystalline 1,4-dimethyl-2, 5-diisopropylbenzene, which is 92.7 (1/0 of theory), are isolated.
Предмет изобретени Subject invention
Способ получени 1,4-диметил-2,5-диизопропилбензола алкилированием га-ксилола пропиленом в присутствии хлористого алюмини д качестве катализатора, отличающийс тей, lAjo, с целью увеличени выхода целевого продукта, процесс ведут при температуре около О С.The method of producing 1,4-dimethyl-2,5-diisopropylbenzene by alkylation of ha-xylene with propylene in the presence of aluminum chloride as a catalyst, characterized by, lAjo, in order to increase the yield of the target product, the process is carried out at a temperature of about C.
Publications (1)
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SU189819A1 true SU189819A1 (en) |
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