Abstract:
The invention relates to a valve having a balancing function for a fluid distribution system. A valve closing member is movable between a closed position and a fully opened position. An actuation device is provided for changing the position of the valve closing member. A control unit is provided and comprises an electronic memory adapted to receive and store an opening limitation value, said opening limitation value being representative of a selected intermediate position between said closed position and said fully opened position of the valve closing member, wherein the control unit controls the actuation device to limit the movement of the valve closing member to positions from said closed position to said selected intermediate position. The invention also relates to a valve system and to a method of operating a valve.
Abstract:
A process for manufacturing epoxy monomers and/or epoxides in high yields and useful quality and chemical stability by dehydrochlorination of the corresponding chlorohydrins with an alkaline agent, producing the corresponding side product dry salt in a high purity, characterized in that the process comprises the following steps: a. Reaction of the chlorohydrins with the alkaline agent to form corresponding epoxides and the corresponding precipitated chloride salt; b. Dehydration, and optionally completing the reaction, of the reaction mixture of step (a), by use of an azeotropic agent, added to step (b) or generated in situ in step (a), resulting in the producing of a dehydrated reaction mixture; c. Separating the resulting chloride salt by filtration from the dehydrated reaction mixture (b) and d. Isolating the epoxide from the filtered liquid fraction.
Abstract:
The invention relates to a valve having a balancing function for a fluid distribution system. A valve closing member is movable between a closed position and a fully opened position. An actuation device is provided for changing the position of the valve closing member. A control unit is provided and comprises an electronic memory adapted to receive and store an opening limitation value, said opening limitation value being representative of a selected intermediate position between said closed position and said fully opened position of the valve closing member, wherein the control unit controls the actuation device to limit the movement of the valve closing member to positions from said closed position to said selected intermediate position. The invention also relates to a valve system and to a method of operating a valve.
Abstract:
A process for manufacturing epoxy monomers and/or epoxides in high yields and useful quality and chemical stability by dehydrochlorination of the corresponding chlorohydrins with an alkaline agent, producing the corresponding side product dry salt in a high purity, characterized in that the process comprises the following steps: a. Reaction of the chlorohydrins with the alkaline agent to form corresponding epoxides and the corresponding precipitated chloride salt; b. Dehydration, and optionally completing the reaction, of the reaction mixture of step (a), by use of an azeotropic agent, added to step (b) or generated in situ in step (a), resulting in the producing of a dehydrated reaction mixture; c. Separating the resulting chloride salt by filtration from the dehydrated reaction mixture (b) and d. Isolating the epoxide from the filtered liquid fraction.
Abstract:
The present invention pertains to a process for preparing a product rich in epichlorohydrin, comprising the steps of: a) reacting a mixture of dichlorohydrin and a base at a temperature in the range of 0-40° C. during a period of time in the range from 1 second to 180 minutes, wherein the base is present in a less than stoichiometric amount, to obtain a reaction mixture comprising epichlorohydrin and brine; b) subjecting at least part of the reaction mixture to a separation step to form a product fraction which is rich in epichlorohydrin and a brine fraction which is lean in epichlorohydrin; c) subjecting at least part of the brine fraction to a purification step to yield a purified brine. It has been found that the process according to the invention allows the manufacture of epichlorohydrin from dichlorohydrin on an industrial scale at high yield, while at the same time providing a brine with a low total organic carbon content without extensive separation being necessary.
Abstract:
Process for producing a chlorohydrin by reaction between a multihydroxylated-aliphatic hydrocarbon, an ester of a multihydroxylated-aliphatic hydrocarbon, or a mixture thereof, and a chlorinating agent, according to which the multihydroxylated-aliphatic hydrocarbon, the ester of a multihydroxylated-aliphatic hydrocarbon, or the mixture thereof used contains at least one solid or dissolved metal salt, the process comprising a separation operation to remove at least part of the metal salt.
Abstract:
Process for preparing an epoxide, wherein halogenated ketones are formed as by-products and there is at least one treatment intended to remove at least part of the halogenated ketones formed.
Abstract:
Process for producing a chlorohydrin by reaction between a multihydroxylated-aliphatic hydrocarbon, an ester of a multihydroxylated-aliphatic hydrocarbon, or a mixture thereof, and a chlorinating agent, according to which the multihydroxylated-aliphatic hydrocarbon, the ester of a multihydroxylated-aliphatic hydrocarbon, or the mixture thereof used contains at least one solid or dissolved metal salt, the process comprising a separation operation to remove at least part of the metal salt.
Abstract:
A method of preparing dichloropropanol using glycerol. The method includes: chlorination of glycerol including a plurality of chlorination reaction stages using a catalyst; and a water-removing stage performed between the reaction stages, independently of the reaction stages.
Abstract:
Process for manufacturing a chemical: chlorohydrins, epoxides, diols, diols derivatives, epoxy derivatives or mixtures thereof, in an industrial plant, comprising a step of chemical reaction for manufacturing the chemical and at least one step selected from the group consisting of storage, supply, removal, transfer, chemical treatment and physical treatment of compounds used or produced in such process, in which at least one aqueous effluent is generated, this aqueous effluent containing at least one of overhead waters, surface waters, ground waters, waters from drinking water distribution networks, waters from industrial water distribution networks, plant cleaning waters, or waters used for heating and cooling the plant, this aqueous effluent containing at least one compound other than water and exhibiting at least one of the following features, a water solubility at 25° C. greater than or equal to 0.01 g/kg of water and a boiling point at 1013 mbar, greater than or equal to −100° C., in which at least one part of the generated aqueous effluent is collected, and in which at least one portion of the collected aqueous effluent is recycled in the manufacturing process.