摘要:
A process for preparing a compound of formula (I): comprises reacting a 1,4-diketone of the formula (II): with a primary amine of the formula (III): wherein R 1 and R 2 may be the same or different and are selected from any one or more of H; C 1 -C 6 alkyl which may be straight or branched, substituted or unsubstituted with a halogen group; C 1 -C 6 alkoxy group; or R 1 and R 2 together represent an alkylidene group of the formula CR a R b wherein R a and R b may be the same or different and are selected from any one or more of a C 1 -C 11 alkyl group, and R 3 is selected from any one or more of a C 1 -C 6 alkyl group, in the presence of a catalyst, the catalyst comprising a salt wherein the salt comprises an amine salt or an inorganic salt of an organic acid.
摘要:
Apparatus (11) for rapid discharge of one or more fire extinguishing agent(s) comprises a sealed container (13) forming an interior volume (15) in communication with a rapidly opening valve assembly (17). The interior volume contains fire extinguishing agent(s), super-pressurised by a gas such as nitrogen. A portion of the nitrogen is dissolved into the fire extinguishing agent(s). When an incident is detected which requires the discharge of the fire extinguishing agent(s) the valve (17) is opened. Opening the valve (17) causes rapid dissolution of the nitrogen from the fire extinguishing agent(s), forming a two-phase mixture (like a foam or mousse) which substantially fills the volume (15) and causing the discharge of fire extinguishing agent(s) from the valve assembly (17). Because the two phase mixture is used to discharge the fire extinguishing agent(s), and this two phase mixture substantially fills the interior volume (15), the fire extinguishing agent(s) will be discharged irrespective of the orientation of the canister (13) and the position of the valve assembly (17).
摘要:
The invention relates to an apparatus and method for supplying content to user devices in a communication system. In a described embodiment a content proxy is provided, which receives content from a broadcast distribution network, acting as a broadcast overlay network, and provides the content to a base station. Thus content can be broadcast to the user device by the base station without requiring backhaul communication system resources to be allocated to the user. The communication with the user device may utilize shared channels. The content proxy and/or the base station may be provided with memory that enables playback of content on demand. Additionally or alternatively, the content proxy and/or the base station may be provided with memory for storing content originating at the user device prior to forward transmission through the communication system at a lower data rate than the data rate at which it was received from the user device and/or being multiplexed with other user data.
摘要:
A fire and explosion suppression system comprises a source (5) of high pressure water which is fed to a misting nozzle (13) at one input of a mixing unit (6), and a source (14) of high pressure inert gas, such as nitrogen, which is fed along a pipe (20) to another input of the mixing unit (6). Inside the mixing unit (6), water mist, in the form of an atomised mist of very small droplet size is mixed with the pressurised gas and exits the mixing unit (6) at high pressure and high velocity along a pipe (22) and is thence discharged through spreaders (26, 28). The source (5) of the water is pressurised by a feed (30) from the source of pressurised inert gas. The mass flow rate of the water will therefore reduce as the pressure of the gas decays. This tends to maintain the ratio of the mass flow rate of the water to the mass flow rate of the gas constant. This is found to produce and maintain an advantageous distribution of droplet size in the discharged mist. A control unit (10) adjusts a metering valve (7) in dependence on the mass flow rate or the pressure of the gas in order to adjust the ratio as necessary to maintain its value constant.
摘要:
A process and apparatus for separating fluids of different density, primarily gas, oil and water from an oil well production flow (12), including a rotary separation turbine (11) separating at least the gas phase, but preferably also the liquid phases, and preferably returning water (16) to the separation step to increase the water cut of the mixture being separated.
摘要:
There is disclosed apparatus for the growth of a biological material in a liquid and comprising a body mounted for rotation in a vessel containing the liquid, said body comprising a medium having an internal structure of interconnected voids which provide an environnement for the growth and support of biomass.
摘要:
A fire extinguisher comprises a container (10) containing water (16) which is pressurised by relatively high pressure carbon dioxide within a space (18). Because of its solubility in water, a substantial amount of carbon dioxide is held in the water in solution. When a valve arrangement (14) opens, the gas pressure within the container ejects the water through an outlet (15), initially in the form of relatively large droplets which, because of their size, are optimally projected towards the seat of the fire. However, as the droplets are projected towards the fire, the carbon dioxide dissolved in each droplet comes out of solution and breaks the droplets up into smaller droplets, thus very significantly increasing the fire extinguishant capability of the water. The water may include phosphates and/or citrates for increasing the solubility of the carbon dioxide in the water and may also include an anti-freeze agent and a surfactant.
摘要:
A one pot process for preparing l-(aminomethyl)-cyclohexaneacetic acid or pharmaceutically acceptable salts thereof comprises the steps of hydrolysing 1-cyanocyclohexaneacetic acid ethyl ester with a potassium, sodium or lithium hydroxide to form a salt of 1-cyanocyclohexaneacetic acid; in-situ hydrogenating the salt of 1-cyanocyclohexaneacetic acid in the presence of a catalyst to form the salt of l-(aminomethyl)-cyclohexaneacetic acid; and isolating l-(aminomethyl)-cyclohexaneacetic acid.
摘要:
Connection means comprising a main housing, a connector and a carrier body, said carrier body comprising a partial cylindrical surface on which said connector is accessible for making connection, said carrier body being rotatable relative to said main housing, said carrier body being mounted on said main housing with said partial cylindrical surface maintaining a substantially constant separation with said main housing during the course of rotation, said connector being rotatable between first and second angular positions about the axis of rotation.
摘要:
A fire and explosion suppression system comprises a source (5) of high pressure water which is fed to a misting nozzle (13) at one input of a mixing unit (6), and a source (14) of high pressure inert gas, such as nitrogen, which is fed along a pipe (20) to another input of the mixing unit (6). Inside the mixing unit (6), water mist, in the form of an atomised mist of very small droplet size is mixed with the pressurised gas and exits the mixing unit (6) at high pressure and high velocity along a pipe (22) and is thence discharged through spreaders (26, 28). The source (5) of the water is pressurised by a feed (30) from the source of pressurised inert gas. The mass flow rate of the water will therefore reduce as the pressure of the gas decays. This tends to maintain the ratio of the mass flow rate of the water to the mass flow rate of the gas constant. This is found to produce and maintain an advantageous distribution of droplet size in the discharged mist. A control unit (10) adjusts a metering valve (7) in dependence on the mass flow rate or the pressure of the gas in order to adjust the ratio as necessary to maintain its value constant.