摘要:
A dialdehyde, trialdehyde or tetraldehyde or at least two thereof as aldehyde are hydrogenated by bringing into contact at least: the aldehyde; a catalyst comprising at least one metal selected from the group consisting of nickel, cobalt and copper in chemically bound and/or elemental form; hydrogen; at a gas pressure in the range from 5 to 350 bar and a temperature in the range from 40 to 300° C.
摘要:
are prepared by single-stage reaction of alkoxydihydropyrans of the formula (II) with water and hydrogen in the presence of a catalyst comprising oxides of nickel, zirconium and copper. In the formulae (I) and (II), R, R′, R″, R′″ can be identical or different and are each hydrogen or a linear or branched saturated hydrocarbon radical having from 1 to 20 carbon atoms in which the hydrocarbon chain may contain O, S and N as heteroatoms and which may be monosubstituted or polysubstituted by hydroxy, thiol or amino groups or halogens.
摘要:
Disclosed is a light that includes a light emitting device having at least one downlight and at least one sidelight. The light also includes a power source configured to provide power to the at least one downlight and the at least one sidelight. In example embodiments, a power system utilizing the power source may include a controller configured to control power flowing from the power source to the at least one downlight and the at least one sidelight and using a timer configured to control how long power will be provided. The light may further include at least one solar cell configured to recharge the power source, and a switch operably connected to the power system so then when the switch is operated the power system routes power to at least at least one downlight and the at least one sidelight.
摘要:
The present invention relates to a process for preparing 1,2-propanediol, in which a glycerol-containing stream, especially a stream obtained on the industrial scale in the production of biodiesel, is subjected to a low pressure hydrogenation.
摘要:
The present invention relates to a process for preparing 1,2-propanediol, in which a glycerol-containing stream, especially a stream obtained on the industrial scale in the production of biodiesel, is subjected to a low pressure hydrogenation.
摘要:
A guide rod assembly for a Jacquard loom is described which is narrower (10 mm or less), instead of 13 mm of conventional guide rods. This reduction in width is attained reducing the overall height of the magnet system integrated in the guide rod. The magnet system has a support member in the form of an iron core with an elongated or oval cross-section, with an excitation coil wound around the iron core. Pole strips are in contact with both front faces of the iron core. The respective top surfaces of the pole strips are spaced apart by less than 13 mm.
摘要:
An electrical switch for an electric device is provided, including a contact system including at least one electrical power supply line, an electronic control circuit and an electrical connection element arranged between at least one contact face of the control circuit and the power supply line. The electrical connection element has at least one metal pin that is fixed in an electrically non-conductive fixing element such that the pin is aligned with respect to the contact face and the power supply line, and such that the pin protrudes from the fixing element on both sides thereof to contact the contact face and the power supply line.
摘要:
For time zone conversion an analog radio clock is provided with a switch device (31), preferably a rotary switch, through which an hour correction value is continuously provided. The UTC-Time received from a time signal transmitter is corrected corresponding to this hour value in a differential establishing step (33). Additionally the analog radio clock is provided with the possibility, to decode whether the time signal transmitter transmitted information is at that instant in a summer or winter time period. Insofar as summer time is decoded, the correction value from the switch device (31) is automatically increased by a value of 1. The output signal from the differential establishing step (33) is employed for step control of the analog radio clock, which thus automatically indicates the instantaneous correct local time upon corresponding setting of the switch device (31).
摘要:
A guide rocker (5) for actuating and for controlling displacement of a slide cover of a sun roof for motor vehicle, which is characterized by being formed as a laminar, usable on both side, form-stable sandwich structure of several plates of different materials. At least one reinforcing plate (16), formed of a punched-out sheet metal, tightly abuts one side surface of a plastic rocker body (15) having a guide slot (11) for receiving a guide pin (10) secured in the rear slide block (9) of the sliding cover (1). The reinforcing plate has a slot (17), which corresponds to the guide slot (11) but has a larger slot width and in which is form-locking received an edge projection that surrounds the guide slot (11), projects outwardly from the rocker body (15), and is formed as one piece therewith.
摘要:
A process for purifying crude pyrroles obtained in the preparation of pyrroles of the general formula I ##STR1## where R is hydrogen or a C.sub.1 -C.sub.6 -alkyl radical, which comprises treating the mixture containing the crude pyrrole with an acid or an activated carboxylic acid derivative and removing the pyrrole from the mixture by distillation at reduced pressure and at a bottom temperature of up to 160.degree. C.