Naphtha vapor pressure

In conjunction with a catalytic cracking unit since the raw catalytic naphtha is rich in propylene and butylenes which are used as alkylation unit feedstocks. As in No. 1 above, a secondary consideration is the reduction of the naphtha vapor pressure. 

Ground turbine fuels are not subject to the constraints of an aircraft operating at reduced pressures of altitude. The temperature of fuel in ground tanks varies over a limited range, eg, 10—30°C, and the vapor pressure is defined by a safety-handling factor such as flash point temperature. Volatile fuels such as naphtha (No. 0-GT) are normally stored in a ground tank equipped with a vapor recovery system to minimise losses and meet local air quaUty codes on hydrocarbons. 

Gas plants are integrated tower systems intended to recover LPG range material and separate it from naphtha products. This stabilizes the naphtha and reduces its vapor pressure. The LPG material may either be saturate gases going to LPG or unsaturates going to further processing. Gas plants on preflash and atmospheric crude processing units are saturate gas plants. Gas plants on FCC units are unsaturate gas plants. Coker and visbreaker gas plants are somewhere between the two. 

Two sources of absorption oil are normally utilized in this tower. The first is the hydrocarbon liquid from the main fractionator overhead receiver. This stream, often called wild, or unstabilized, naphtha, enters the absorber a few trays below the top tray. The second absorbent is cooled debutanized gasoline, which generally enters on the top tray. It has a lower vapor pressure and can be considered a trim absorbent. The expression lean oil generally refers to the debutanized gasoline plus the unstabilized naphtha from the overhead receiver. 

A tank containing 1500 m3 of naphtha is to be blended with two other hydrocarbon streams to meet the specifications for gasoline. The final product must have a minimum research octane number (RON) of 95, a maximum Reid Vapor Pressure (RVP) of 0.6 bar, a maximum benzene content of 2% vol and maximum total aromatics of 25% vol. The properties and costs of the three streams are given in the Table 3.5. 

Ethylene Cyanohydrin or /3-Hydroxypropio-nitrile, HO.CH8.CH2.CN mw 71.08, N 19.71% poisonous straw-colored Uq, sp gr 1.0404 at 25°/4, fr p -46°, bp 227-28°(dec), vapor pressure 20mm at 117 miscible with w, acet, ethanol, chlf, methyl-ethyl ketone si sol in eth insol in benz, CC14 naphtha. It can be prepd by interaction of ethylene oxide with... 

Separating water from an oil emulsion is best done by an entrainer added as a diluent to the oil. For example, the diluent added to the oil emulsion is a naphtha fraction having an effective vapor pressure equal to that of octane. This naphtha is added to the oil, and as much water as possible is separated the oil emulsion layer which is not broken contains the added naphtha. 

Catalytic Activity Measurement. The reaction was carried out in a stainless steel microflow reactor. In each run, 2 g catalyst was placed in the reactor and heated to 520 °C under a nitrogen stream. The nitrogen stream was replaced by a light naphtha vapor fed by a micro plunger pump. The reaction was carried out at 520 °C, under various pressures and WHS Vs without any hydrogen addition. The products were analyzed periodically by gas chromatography. The properties of the light naphtha are shown in Table I. 

A 1-m square thin plate of solid naphthalene is oriented parallel to a stream of air flowing at 20 m/s. The air is at 330 K and 101.3 kPa. The naphthalene remains at 290 K at this temperature the vapor pressure of naphtha-... 

Whenever the debutanizer pressure reached 130 psig, the reboiler pressure exceeded the hot-oil pressure. The relatively low-boiling naphtha then flowed into the hot oil and flashed. This generated a large volume of vapor that then backed hot oil out of the reboiler. The naphtha vapors passed on into the main fractionator and flooded this tower. Thus, the cause of the gas plant instability was neither a process design error, instrument malfunction, nor pumping deficiency. It was a quite ordinary reboiler tube failure. 

Colorless liquid with a strong disagreeable skunk-like odor vapor pressure 440 torr at 20 C (68 F) density 0.839 at 20 C (68 F) boils at 36°C (96.8°F) freezes at —148°C (-234.4°F) slightly soluble in water (0.68 g/ 100 mL), soluble in alcohol, ether and petroleum naphtha. 

Petroleum distillates (petroleum naphtha, petroleum ether) Vapors irritating to eyes and respiratory tract. A CNS depressant. If n-hexane, benzene, or other toxic contaminants are present, those hazards should be addressed. See also p 219. 1100 ppm [LEL] 1 4 0 (petroleum ether) Colorless liquid. Kerosene-like odor at levels below the TLV serves as a warning property. Highly flammable. Vapor pressure Is about 40 mm Hg at 20°C (68°F). 

Chem. Descrip. Mixt. of high boiling aromatics, ketones and esters Uses Surf, additive to counteract surface defects, leveling agent for solv.-based coatings, chlorinated rubber systems, silk screen inks Properties Water-wh. liq. aromatic odor sp.gr. 0.86 dens. 7.16 vapor pressure 3 mm Hg flash pt. 43 C ref. index 1.470 <1.0%. in naphtha/ 2,6 dimethyl-4-hepanone/dipentene (14/5/1)... 

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