Latches

If one is absolutely serious about ultra pure safrole then it can be separated from the eugenol-free sassafras oil by treatment with mercuric acetate [1,2,3,4] which likes that terminal double bond that only safrole has. The Hg(AcO)2 latches on to safrole at that double bond bringing it into solution as a solid sort of like the way that eugenol was. The safrole can then be separated from its still oily buddies by vacuum filtration. Safrole is then regenerated to its normal oily form by treatment with hydrochloric acid (HCI) which flicks the Hg(AcO)2 off the safrole and the safrole double bond reforms. As it so happens, the mercuric acetate also reforms intact so that it can be reused again such as in one of those... 

Anyway, one has the P2P/crap oil, right Right. Next one makes a saturated sodium bisulfite solution by dissolving as much sodium bisulfite as will dissolve in a given amount of water (say, lOOOmL). Now one adds the MD-P2P oil into some of the saturated solution and stirs for 30 minutes. The temperature of the reaction will rise and a big old mass of P2P crystals will form. People often say that the crystals look like chicken fat. Those crystals formed because the bisulfite from the sodium bisulfite latched onto the ketone of the P2P to form a precipitate. And since the P2P is probably the only oil component with a ketone, it is gonna be the only thing of any consequence that crystallizes. 

To do the reaction the chemist places a flask in an ice bath on top of the stirplate and into it is added lOOmL acetonitrile (CH3CN) and 65g anhydrous mercuric nitrate. A small separatory funnel that has 33g of safrole or 24g allylbenzene is placed over the flask so that everything looks just like that of fig. 9. The safrole is then slowly dripped in so that the temperature stays between 20-28 C. A yellow precipitate will form as the mercuric nitrate latches on to the safrole. After the addition is finished, the ice bath is removed and the solution stirred at room temperature for 1 hour. 

Thermal Dispersion. Thermal dispersion level switches are used on appHcations where multiple shifts inhquid characteristics are present. The unit is responsive only to a change in the thermal conductivity of the Hquid and ignores shifts in specific gravity, dielectric, density, temperature, and pressure. Units are used for alarm signal however, pump control maybe obtained using two units with a latching relay. 

Conical ends vary from machined forgings to roll-formed tubing, and clamps vary from machined forgings to bands to which sever roll-formed channels are attached at their centers by spot welding. A hinge may be inserted in the band as a substitute for one of the draw bolts. Latches may also be substituted for draw bolts. 

Fluid-pressure distribution tends to close the valve. For this reason, the smaller manually operated valves have a latching device on the handle, and the larger manually operated valves use worm gearing on the stem. This hydraulic unb ance is proportional to the pressure drop and, with line velocities exceeding 7.6 m/s (25 ft/s), is the principal component in the torque required to operate the valves. Compared with other valves for low-pressure drops, these valves can be operated by smaller hydrauhc cylinders. In this service butterfly valves with insert bodies for bolting between existing flanges with bolts that... 

Container sliips have guides in the hold and on deck which hold boxlike containers or tanks. The tank is latched to a trailer chassis and hauled to shipside. A movable gantiy, sometimes permanently installed on the ship, hoists the tank from the trailer and Towers it into the guides on the ship. This system achieves large savings in labor, but its apphcation is sometimes limited by lack of agreement between ship operators and unions. 

Latch operation production capacities. Useful for beat-sensitive or readily oxidiz-able materials. Solvents can be recovered... 

See comments under Pastes and Sludges Suitable for Latch operation, small capacities. Useful for heat-sensitive or readily oxidiz-able materials. Solvents can be recovered. See comments under Granular solids Not applicable See comments under Granular solids... 

ALLreviations reactors Latch (B), continuous stirred tank (CST), fixed Led of catalyst (FB), fluidized Led of catalyst (FL), furnace (Furn.), multituLular (MT), semicontinuous stirred tank (SCST), tower (TO), tuLular (TU). Phases liquid (L), gas (G), Loth (LG). Space velocities (hourly) gas (GHSV), liquid (LHSV), weight ( VHSV). Not available, NA. To convert atm to kPa, multiply Ly 101.3. 

Wliile racking-out the trolley, it should not be possible to completely withdraw it unless it has reached the isolation position. In the isolation position there must be a holding-on latch arrangement, to prevent an abrupt fall of the trolley from its module. Figure 13.36 illustrates this feature. 

The PLC controller mentioned earlier is used basically for regulating industrial processes or to replace relay controllers (latching) in electrical... 

The operator had tested the system on several occasions, as it was used at every shutdown. However, it was tested in conditions of no stress, and he did not notice that it took a minute or so to operate. The solenoid valve should have been fitted with a latch so that once the switch had been operated, the solenoid valve could not return to its normal position until it was reset by hand. 

The air valve reopened because the solenoid valve in the instrument air line leading to the air valve would not stay in the tripped position. It should have been fitted with a latch. 

Hypervigilance Panic occurs leading to disruption of a person s thoughts. A person may fail to recognize all the alternatives open to him and latch onto a hastily contrived approach that appears to offer and immediate solution. 

Elinke, /. latch pawl catch (door) handle, Elinker, m, clinker, (hard) brick, -pflaster, n, brick paving. 

Rast-gdrung, /. Brewing) arrested fermentation. -klinke, /. catch, detent, pawl, latch, rastlos, a. restless. 

Three-Way Solenoid Valve Latch Type With Manual Reset... 

Check safety latches and guides in telescoping mast for free operation before lowering operation. Keep latches and guides clean and properly lubricated. 

Spiders The component of the elevator that latches onto the hoisted item. 

Grease coat latching mechanism, link arms, and saddle. 

Grease coat link arm wear surfaces, latch lug and bore seat on bottleneck elevators. 

Figure 4-26b. Casing, tubing, and drill pipe elevators, and center latch elevators [10].

Grease coat rod seating area, ball throat and latch mechanism. 

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