Separation of a component contained in a gas, by desublimation is carried out in a separator outfitted with a plurality of tube coils interposed so that turns of one coil are disposed between turns of another coil. The coils are connected in parallel so that coolant can be passed in timed sequence, successively through the coils, changing the coils used for cooling in accordance with build up of sublimate on the turns to maintain in cooling service coils not bearing excessive sublimate. The turn...

An improved fractional divider that comprises an integer value storage means containing the integer part of the division value `K` connected to the input of a programmable counter means that is configured for a count value of `K` or `K+1` depending upon the state of a count control signal and generates the output signal as well a terminal count signal which is connected to an enable input of a fractional accumulator means that produces the count control signal on an addition overflow and has a f...

A fractional calculator (10) has a keyboard (12) with numeral keys (18) and denominator keys (20). Through use of the numeral keys (18) and the denominator keys (20), fractional inputs may be entered into the calculator and calculations carried out on the inputs through use of function keys (22). A decimal/U.S. toggle key (26) allows the calculator to be used in either a conventional decimal mode or a fractional mode. When the calculator is used in a fractional mode, key (30) is used to differen...

Process and apparatus are provided for the recovery of low, medium and high boiling components from feed streams containing same wherein reboiler fouling, gumming and the like are minimized, via the control of fractionator reboiler temperatures.

A microprocessor-based system generates an electronic document based on a set of microprocessor-readable instructions organized in logical units known as instruction nodes. Each instruction node includes at least one microprocessor-readable instruction. If an instruction node is eligible for caching, it is associated with a cache key value, which is compared with a cache key value that is stored in a cache memory and that is associated with a data item. If the cache key value associated with the...

A fractional filtration apparatus, used for obtaining cutting oils fractionally cleaned by using one filtration apparatus so as to reuse the separated cutting oils in accordance with the types of machining operations, includes a plurality of liquid tanks for fractionally storing the cleaned cutting oils, a filtration target cutting oil storage tank for temporarily storing a filtration target cutting oil charged through a charge port, rotatably driven filtration drums, dividing the liquid level o...

A crystallisable component, for example paraxylene, is separated from solution by chilling, separating crystals, washing them, chilling the mother liquor in the presence of wash liquid, separating further crystals and washing them. The invention enables concentrated solutions to be handled easily by keeping the proportions of crystals at each crystallisation stage low without requiring two separations of wash liquid from mother liquor.

A frequency divider for dividing a frequency in the ratio or fraction whose numerator is 2 and whose denominator is an odd number which comprises a counter circuit for counting input clock pulses; a device connected to the output terminal of the counter circuit so as to deliver a reset signal to the counter circuit when it counts a prescribed number of clock pulses; and a device for supplying a polarity-reversed clock pulse to the counter circuit upon receipt of the reset signal.

A relatively small value of current is obtained in an integrated circuit by separating a larger current into two or more parts. The circuit includes two transistors and at least two strings of the same number of series connected diodes. Currents in a fixed ratio to one another are applied in the forward direction to the two strings of diodes and the voltages thereby obtained are applied to the respective base electrodes of the transistors. The larger current is applied in parallel to the emitter...

In the fractional distillation of multicomponent mixtures where freezing of a component is encountered in the overhead condensing section and/or product decomposition is encountered at reboiling temperatures, these problems are obviated by carrying out the distillation in the presence of an added inert liquid which is somewhat more volatile than the component having a tendency to freeze. In one embodiment, the reaction effluent obtained in the production of thiophenol is subjected to fractional ...