摘要:
Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein(a) methyl formate is hydrolyzed,(b) the methanol and excess methyl formate are distilled from the hydrolysis mixture obtained,(c) the bottom product of distillation (b), consisting of formic acid and water, is extracted, in a liquid-liquid extraction, with an extractant which in the main takes up the formic acid,(d) the resulting extract phase, consisting of formic acid, the extractant and a part of the water, is subjected to distillation,(e) the top product obtained from this distillation and consisting of all or part of the water introduced into the distillation, and part of the formic acid, is recycled, as vapor, into the lower part of the distillation column of stage (b),(f) the bottom product of distillation stage (d), consisting of the extractant, with or without part of the water, and the greater part of the formic acid, is separated by distillation into anhydrous or substantially anhydrous formic acid and the extractant, and(g) the extractant leaving stage (f) is recycled to the process.
摘要:
A device for controlling the flow rate of a fuel gas/air mixture, and/or the ratio between the fuel gas and air in such a mixture. The device includes a body having an air inlet, a fuel gas inlet, a fuel gas/air mixture outlet, a gas-control passage in the body, with the cross-sectional area of the gas-control passage being variable via a control device for controlling the flow of fuel gas through the device, and an adjustable air-control passage for adjusting the flow of air through the device. The air-control and gas-control passages are configured and disposed in the body in such a way that they cooperate to also form an area within the body where said controlled fuel gas and air flows are combined and mixed.
摘要:
Manufacture of formaldehyde by oxidative dehydrogenation of methanol in the presence of a silver catalyst using methanol obtained from a condensate derived from the evaporation of aqueous reaction mixtures in the synthesis of urea resins and then treated with caustic soda solution under specific conditions of temperature, pressure, residence time and initial formaldehyde concentration. The formaldehyde obtained is a disinfectant, tanning agent, reducing agent and starting material for the manufacture of synthetic resins, adhesives and plastics.
摘要:
The present invention relates to a process for recycling silicone-coated paper by disintegration and new formation of sheets, which comprises carrying out the disintegration in the presence of one or more salts of monophosphoric esters.
摘要:
A device to control a gas-fired appliance as a function of the composition of a gaseous fuel. The device includes a thermal conductivity sensor emitting a measurement signal dependent upon the thermal conductivity of the gaseous fuel. An analyzing unit receives the measurement signal and uses it to develop a control signal dependent upon the composition of the gaseous fuel. A control unit receives the control signal and uses it to control the operating parameters of the gas-fired appliance, in the case of a gas engine particularly the parameters of air/fuel ratio, output and angle of advance. The analyzing unit may include an input interface into which data on the type of gaseous fuel components may be entered, which are used for the generation of the control signal. Preferably the control signal is proportional to the available methane number of the gaseous fuel, whereby the operating parameters of the gas engine are controlled so that the methane number required is adjusted to the methane number available. This leads in particular to an improvement in the knocking behavior of the gas engine.
摘要:
Hydraulic pressure representing engine throttle position is applied to a valve spool having two control surfaces. In opposition to the force of a control spring, a pressure line, which opens to the valve chamber between the two control surfaces, carries regulated line pressure through a flow orifice in a first connecting line and through an aperture stop in a second connecting line. The flow orifice of the first connecting line is arranged in parallel with an aperture of the second connecting line, both the first and second connecting lines being connected directly to the valve chamber.
摘要:
In a method and apparatus for dynamics compression in images or signal series represented by individual amplitude values, input amplitude values EA of the images or signal series are subjected to a local spatial amplitude averaging, to generate locally spatially averaged input amplitude values . Differential function values are then formed based on differences between the input amplitude values EA and the locally spatially averaged input amplitude values , and output amplitude values AA of the images or signal series are generated from the formed differential function values. In forming the differential function, additional differential values are superimposed on the differences formed from the input amplitude values EA and the locally spatially averaged input amplitude values , which additional differential values are formed from the input amplitude values EA and a predefined reference value GA.
摘要:
A case or housing for a clock, particularly for use in moist rooms, has a cup-shaped dome portion with an opening that is closed by a cover glass at the side of the observer and while a rear portion is closed by a back cover. A support plate which is provided in the dome portion divides the case into several inner spaces and bears a clock movement that can include a dial. In order for the case to be suitable for moist rooms, such as bathrooms, communicating with the case inner space which is adjacent the interior face of the cover glass are air circulation passages which communicate with the outside.