摘要:
A process for the production of thionaphthene by dissociation of thionaphthene sulfonic acid such as obtained, for example, in the partial sulfonation of naphthalene fractions of coal tar, characterized in that the density of the reaction mixture is maintained essentially constant during the entire duration of the dissociation reaction and the thionaphthene formed is not removed by azeotropic distillation; a product of high purity is obtained in high yield in a substantially reduced reaction time.
摘要:
In a process for obtaining substantially sulfur free pure naphthalene from bituminous coal tar and thionaphthene as a by-product, a de-phenolized thionaphthene-containing naphthalene fraction from oxidative purification is extracted with concentrated sulfuric acid and acetic acid anhydride in benzene. The thionaphthene is converted into its sulfonic acid derivative and water washed from the benzene-naphthalene mixture. The benzene is distilled leaving pure naphthalene. The sulfonic acid group is cleaved from the thionaphthene with superheated steam to yield thionaphthene.
摘要:
This invention relates to a plasticized coal tar pitch comprising a mixture consisting essentially of about 50 to about 80 weight percent of a coal tar pitch having a softening point of about 40.degree. to about 75.degree. C. (Kramer-Sarnow); and about 50 to about 20 weight percent of a coal tar fraction rich in crystals and having a boiling point of about 350.degree. C. to about 450.degree. C. The mixture is suitable for blending with crude oil bitumen for producing a binder suitable for application to roadways.
摘要:
A system for switching data packets through a multiple (m) input, multiple (n) output switching device providing switching having a fast one-cycle throughput. A respective switching device behaves like an output queued switch from a set of distributed output queues reading the incoming input control information from the plurality of input ports (IP) and compresses the information in a form which allows an easy association with a respective output port (OP) to which an individual input port is temporarily mapped.
摘要:
A circuit for checking the memory array address and contents is described. The circuit consists of at least one write address counter (120) and at least one read address counter (130). Before a data word is read into the array, each of its check bits are XORed with one bit of the address location at which the word is to be written. On reading out the word, the check bits are again XORed with the bits of the address location to restore their original value and the parity of the data word is checked. If the parity is found to be incorrect then it is known that an error has occurred either on reading in or reading out and the appropriate action can be taken.
摘要:
The axially movable pressure plate of a friction clutch for motor vehicles is non-rotatably secured to the housing by a set of leaf springs each of which has an end portion overlying that surface of the pressure plate which faces away from the clutch plate. The end portion of each leaf spring has an opening in register with the open end of a blind bore in the surface of the pressure plate. Such end portions of the leaf springs are permanently fastened to the pressure plate by tubular connecting elements having (a) enlarged end portions overlying those sides of the leaf springs which face away from the pressure plate and (b) main portions which extend through the respective openings and into the registering blind bores and are radially expanded into pronounced frictional engagement with the pressure plate. The plastically deformable material of the main portions of the connecting elements is expanded by an extractible tool or by discrete spreading pins which are driven into open-ended sockets of the connecting elements and remain therein to maintain the main portions in radially expanded condition. The connecting elements contribute to a reduction of the overall weight of the friction clutch, to a reduction of the dimensions of the clutch, as considered in the axial and radial directions, to a reduction of the weight of the clutch, and to greater reliability of the connections between the leaf springs and the pressure plate and hence to greater safety of the clutch.
摘要:
In order to provide an electrocoating plant for coating workpieces, in particular vehicle bodies, comprising at least one immersion bath, in which at least one electrode is disposed, a conveying device, which brings the workpieces into the immersion bath and out of the immersion bath again, and a power supply device, which generates from an a.c. input voltage an output voltage, in particular a d.c. output voltage, one output potential of which is applied to at least one of the workpieces to be coated and the other output potential of which is applied to at least one of the electrodes disposed in the immersion bath, which enables an individual output potential to be applied to each workpiece in a simple manner, it is proposed that the power supply device comprise at least one current control unit which moves together with a workpiece associated with the current control unit through at least one section of the electrocoating plant and provides the output potential for the workpiece associated with the current control unit.
摘要:
A system for switching data packets through a multiple (m) input, multiple (n) output switching device providing switching having a fast one-cycle throughput. A respective switching device behaves like an output queued switch from a set of distributed output queues reading the incoming input control information from the plurality of input ports (IP) and compresses the information in a form which allows an easy association with a respective output port (OP) to which an individual input port is temporarily mapped.
摘要:
A pulley which can be driven by the output element of the engine in a motor vehicle to transmit torque to one or more endless belts or chains has a rotary input member, a rotary output member and a damper which yieldably opposes rotation of the input and output members relative to each other about a common axis and is at least partially confined in an annular chamber defined by at least one of the input and output members. The chamber can further receive a friction bearing which operates between the input and output members, as well as a vibration absorbing device. Such device can have a mass which is adjacent a flange of one of the input and output members and one or more energy storing elements acting in the circumferential direction of the pulley.
摘要:
A friction clutch wherein the diaphragm spring is installed between two annular seats which are carried by the clutch cover. At least one side of the spring has a set of radially extending reinforcing projections each of which extends in part into the annular main (outer) section and into one of the radially inwardly extending prongs. The respective seat has recesses for intermediate portions of such projections. The diaphragm spring is made of special spring steel and the recesses can be formed by deformation of and/or removal of material from the respective seat or seats.