Pakikipagtulungan
SINING
BEAUTY AT WELLNESS
CRAFTS
KULTURA AT KASAYSAYAN
LIBANGAN
KAPALIGIRAN
PAGKAIN AT INUMIN
REVERSE ENGINEERING
AGHAM
ISPORTS
TEKNOLOHIYA
MGA WEARABLE
Aviation Gasoline by Catalytic Cracking over Silica-Alumina Gel at 750 °F (Voorhies, US 2,230,552)
Oil vapour passed over a hot silica-alumina gel cracks into gasoline of relatively high octane number. Voorhies (Standard Oil Development, 1941) showed that a light feed cracked at a low temperature, about 750 °F, gives aviation gasoline that needs little or no further refining.
Best result in the patent (Ex. 1, a light crude cut boiling 336-540 °F): 25.9 % of the feed as aviation gasoline (the table says 25.0 %), ASTM octane 81.0 clear and 91.7 with 3 cc of tetraethyl lead per gallon.
Variables: the feed, the temperature and the feed rate. Hotter and faster gives less gasoline and more unsaturates. Source: A. Voorhies Jr., US 2,230,552 (1941). Not given: reactor design, how the catalyst is regenerated, catalyst amounts. Highly flammable vapours. Picture: catalytic cracking units in Louisiana, about 1944 (FSA, public domain).
Dalubhasa
1 day
Mga Tagubilin
1
1
Fill the reactor with silica-alumina gel
Fill the reactor with silica-alumina gel
Pack the reaction zone with a synthetic gel of silica and alumina. Voorhies's gel was silica hydrogel soaked in aluminium nitrate solution, dried, and heated to break down the nitrate and activate it, with a silica to alumina molar ratio of about 12 to 1.
Mga kailangang kasangkapan:
Fixed-bed na tubular reactor
Katalista na gel ng silica-alumina2
2
Choose a light feed
Choose a light feed
The feed should have a mid-boiling point below 600 °F and an aniline point below 155 °F, better below 150 °F; the heavier the feed, the lower its aniline point must be. Kerosene of aniline point 145 °F (Ex. 6) qualifies. A gas oil of aniline point 173 °F (Ex. 5) gave a gasoline of acid heat 34 °F, against 12.5 °F in Ex. 1.
Mga materyales para sa hakbang na ito:
Gaas0.6 volume per volume of catalyst per hourMga kailangang kasangkapan:
Tangke ng langis3
3
Crack at 750 °F in half-hour runs
Crack at 750 °F in half-hour runs
Hold the reaction zone at 750 °F (range 700-800 °F). Pass 0.6 volume of liquid feed per volume of catalyst per hour, in half-hour cracking periods with a regeneration of the catalyst between them. Voorhies does not say how he regenerated it.
Mga kailangang kasangkapan:
Fixed-bed na tubular reactorKatalista na gel ng silica-alumina
Termometro4
4
Fractionate the cracked product
Fractionate the cracked product
Condense and fractionate the cracked products. Take aviation gasoline up to an end point of about 290 to 310 °F. In Ex. 2 the rest split into 8.7 % gas, 37.5 % heavy naphtha boiling 300-400 °F (octane 75.8 clear, usable as a blending agent or solvent) and 25 % gas oil.
Mga kailangang kasangkapan:
Alambike ng paghati-hati
Ikid ng kondensador
TubigTangke ng langis5
5
Variables: feed, temperature, rate
Variables: feed, temperature, rate
Ex. 1 (336-540 °F crude cut, 750 °F, 0.6): 25.9 %, octane 81.0 clear. Ex. 2 (244-507 °F cut, 725 °F, 0.3): 30.8 %, 79.2 clear, 89.5 with 3 cc lead. Ex. 6 (kerosene, 750 °F, 0.6): 20.1 %, acid heat 16 °F. Ex. 7 (gas oil, 850 °F, 1.2): 20.6 %, acid heat 70 °F against 20+ °F at 750 °F (Ex. 4).
Mga kailangang kasangkapan:
Fixed-bed na tubular reactorMga Kinakailangang Kasangkapan
7- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
Ang blueprint na ito ay gumagawa ng
Kaugnay na Blueprint
Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo
CC0 Pampublikong Domain
Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.
Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.