摘要:
A regeneration method of a working solution is herein disclosed in which various by-products which do not participate in the production of hydrogen peroxide and which are present in the working solution in a hydrogen peroxide production process utilizing an anthraquinone method can efficiently be converted into anthraquinones effective as reaction media for the production of hydrogen peroxide.The present invention is concerned with (1) a regeneration method of a working solution wherein at least a part of the unreduced working solution is brought into contact with a catalyst mainly comprising a .gamma.-alumina at a temperature of 40 to 150.degree. C., and (2) another regeneration method of a working solution wherein the working solution is brought into contact with a catalyst mainly comprising a .gamma.-alumina at a temperature of 20 to 150.degree. C. under conditions that a concentration h (mol/liter) of the alkyltetrahydroanthrahydroquinones in the working solution before the catalytic treatment meets the equation(0.0018.times.t-0.0285).times.h
摘要:
A process for producing hydrogen peroxide by subjecting a working solution containing anthraquinones as the reaction medium, to reduction and oxidation alternately, which process is characterized in that (1) the anthraquinones as the reaction medium contained in the working solution are a mixture of an alkyl-substituted anthraquinone and an alkyl-substituted tetrahydroanthraquinone, (2) in the reduction step, the total amount of the alkyl-substituted tetrahydroanthraquinone in the working solution and part or the total amount of the alkyl-substituted anthraquinone in the working solution are reduced, and (3) in the working solution after the reduction step, the content of the alkyl-substituted anthrahydroquinone formed is kept higher than the content of the alkyl-substituted tetrahydroanthrahydroquinone formed.
摘要:
A hydrogenation catalyst for the production of hydrogen peroxide by the hydrogenation of anthraquinones in accordance with a hydrogen peroxide production process utilizing an anthraquinone method. The catalyst includes palladium supported on a carrier. The carrier comprises spherical silica particles, wherein at least 90 wt % of the silica particles have particle diameters of 10 to 100 .mu.m. The silica particles have an average particle diameter of 30 to 60 .mu.m and a pore volume of 0.4 to 1.0 ml/g. The catalyst has desirable activity, strength, service life and selectivity.
摘要:
A method for preparing hydrogen peroxide in accordance with an anthraquinone method, comprising hydrogenating at least one anthraquinone with a hydrogenation catalyst comprising palladium and at least one alkali metal, supported on a silica carrier, wherein the at least one alkali metal is in an amount of 0.1% to 5 wt % based on the weight of the silica carrier.
摘要:
The present invention provides a fixed bed reactor for carrying out a mixed gas/liquid phase reaction, wherein the reactor has a piping structure composed of microchannels, the cross-sectional area of the fixed bed is 0.0001 cm2 to 0.008 cm2 and a single or parallely arranged two or more fixed beds, and the reactor has, in addition to the fixed beds, a gas phase distribution portion, a portion for introducing the gas phase to the fixed bed, a liquid phase distribution portion, a portion for introducing the liquid phase to the fixed bed, a packing material introduction portion and a fluid merging portion, a gas/liquid mixed phase reaction process for carrying out a gas/liquid mixed phase reaction using the fixed bed reactor described above, and further a process for producing hydrogen peroxide in which the reaction is started and stopped in a reducing atmosphere, and the present invention further provides a novel fixed bed gas/liquid mixed phase reactor which makes it possible to carry out gas/liquid mixed phase reactions stably and under steady state conditions by using microchannels.
摘要:
The present invention provides a fixed bed reactor for carrying out a mixed gas/liquid phase reaction, wherein the reactor has a piping structure composed of microchannels, the cross-sectional area of the fixed bed is 0.0001 cm2 to 0.008 cm2 and a single or parallely arranged two or more fixed beds, and the reactor has, in addition to the fixed beds, a gas phase distribution portion, a portion for introducing the gas phase to the fixed bed, a liquid phase distribution portion, a portion for introducing the liquid phase to the fixed bed, a packing material introduction portion and a fluid merging portion, a gas/liquid mixed phase reaction process for carrying out a gas/liquid mixed phase reaction using the fixed bed reactor described above, and further a process for producing hydrogen peroxide in which the reaction is started and stopped in a reducing atmosphere, and the present invention further provides a novel fixed bed gas/liquid mixed phase reactor which makes it possible to carry out gas/liquid mixed phase reactions stably and under steady state conditions by using microchannels.
摘要:
An open medical system for deploying, supporting and organizing medical equipment and medical utilities including a utility connection, and a main assembly having a primary structure having an upper plate and lower plate held in fixed spaced apart relation by a plurality of spacers, the main assembly also having at least one core, with each core having at least one utility outlet, the system having an open space bounded by the upper and lower plates and the inner surfaces of the outlets, which open space is free of utility outlets. Equipment rails are connected between the spacers to support medical equipment. A rotating base assembly may be used to support the system, and to restrict rotation.
摘要:
A component-based utility supply apparatus includes a wall-mounting bracket, a utility distribution unit mounted to the wall mounting bracket and an equipment management rail. The wall mounting bracket includes a longitudinally extending wall mounting flange and a support bracket having an upper supporting flange and a lower supporting flange that are interconnected via a rear wall extending therebetween, the rear wall being attached to the mounting bracket. The utility distribution unit can comprise a fluid (gas) manifold, or a power distribution assembly, or both the gas manifold and the power distribution assembly may be coupled together with the wall mounting bracket and equipment rail to provide a combined power and gas utility configuration. The utility supply apparatus further comprises integrated lighting devices and light transmissive lens panel for supplying light along at least a portion of the utility supply apparatus.
摘要:
A component-based utility supply apparatus includes a wall mounting bracket, a utility distribution unit mounted to the wall mounting bracket and an equipment management rail. The wall mounting bracket includes a longitudinally extending wall mounting flange and at least one longitudinally extending supporting flange. The utility distribution unit can comprise a fluid (gas) manifold, or a power distribution assembly, or both the gas manifold and the power distribution assembly may be coupled together with the wall mounting bracket and equipment rail to provide a combined power and gas utility configuration. The utility supply apparatus further comprises integrated lighting devices and light transmissive lens panel for supplying light along at least a portion of the utility supply apparatus.
摘要:
An open medical system for deploying, supporting and organizing medical equipment and medical utilities comprising a utility connection, and a main assembly having a primary structure having an upper plate and lower plate held in fixed spaced apart relation by a plurality of spacers, the main assembly also having at least one core, with each core having at least one utility outlet, the system having an open space bounded by the upper and lower plates and the inner surfaces of the outlets, which open space is free of utility outlets. Equipment rails are connected between the spacers to support medical equipment. A rotating base assembly may be used to support the system, and to restrict rotation.