55results about How to "Catalyst content reduction" patented technology

An apparatus and method for producing fatty acid alkyl esters from fatty acids derived from vegetable oils and animal fats with an alkaline solution dissolved in stoichiometric or near-stoichiometric levels of a monoalkyl alcohol to form a mixture. The method further comprises emulsifying the mixture as a means to reach a completed chemical reaction state in a reactor section, wherein the oils or fats are transesterified into fatty acid alkyl esters. The transesterification occurs when the natural boundary surfaces of the immiscible mixture are enlarged by ultrasonic cavitation in the reaction section and the transesterification is performed at, or near atmospheric pressure. The method finally includes, after reaching the chemical reaction state, separating residues from the fatty acid alkyl ester in a gravitational phase separation section.

A separation method for a slurry bed fischer-tropsch synthesis heavy product and a catalyst is characterized in that the fischer-tropsch synthesis heavy product from a slurry bed reactor and the magnetic fischer-tropsch synthesis catalyst, after degassing, enter the lower part of a separator, the catalyst and the fischer-tropsch synthesis heavy product are preliminarily separated by gravity settling to obtain concentrated slurry rich in the catalyst in the lower part of the separator, the concentrated slurry is cycled to the slurry bed reactor, and obtained diluted slurry enters into a magnetic separator zone on the upper part of the separator; in the magnetic separator zone, the catalyst is adsorbed by magnetic force in a magnetic field zone, when the amount of the catalyst adsorbed in the magnetic field zone reaches a set amount, the magnetic field is removed, the catalyst sinks by gravity to a flow guide pipe, flows to the bottom of the separator along the flow guide pipe, and is is cycled to the slurry bed reactor; after the magnetic separation, the catalyst is further separated from the fischer-tropsch synthesis heavy product containing less catalyst by a filter element, and is discharged out of the separator, and the filtered catalyst is cycled to the slurry bed reactor.

The present invention provides an aliphatic polycarbonate production method which, using carbon dioxide and an epoxide, easily produces aliphatic polycarbonates having a low metal catalyst content.The invention relates to an aliphatic polycarbonate production method which includes a step of polymerization by reacting carbon dioxide with an epoxide in the presence of a metal catalyst; and a step of treating a polymer obtainable in the polymerization step with a surfactant. High-purity aliphatic polycarbonate having a low metal catalyst content can be easily provided by the aliphatic polycarbonate production method of the invention.

Device for treatment of a gas flow including at least one body (3), at least one first opening (4, 4') for entrance of an incoming gas flow to the body (3) and at least one second opening (5, 5') for the exit of an outgoing gas flow from the body (3). The body (3) is provided with a plurality of gas flow passages (11a, 11b) arranged to permit heat exchange between the gas flows in adjacent passages. The device has at least one distribution section (26, 26') in communication with the first opening (4, 4') and with the gas flow passages (11a, 11b) to distribute the incoming gas flow to the gas flow passages (11a, 11b), and at least one gas flow passage section (27, 27') including the gas flow passages (11a, 11b), which passage section (27, 27') primarily is adapted to permit heat exchange and to cause a conversion in the composition of the gas.

An electrode for an electrochemical system, such as a fuel cell, is formed by an active layer including: pores; at least one catalyst; at least one ionomer; and electrically-conductive particles. The catalyst content per pore ranges between 30 and 500 mg / cm3 with respect to the pore volume.

The invention discloses a catalytic conversion method for preparing propylene and high-octane value gasoline. Crude oil contacts a catalyst rich in mesoporous zeolite and with coarse particle size distribution for reaction; and reaction temperature, weight hourly space velocity and the weight ratio of the catalyst to the crude oil are sufficiently proper for preparing a reaction product comprising 12 to 60 percent of catalytic wax oil based on the weight of the crude oil in the reaction, wherein the weight hourly space velocity is 25 to 100 h<-1>; the reaction temperature is 450 to 600 DEG C;and the weight ratio of the catalyst to the crude oil is 1 to 30. The invention provides the catalytic conversion method based on the prior art, which particularly has the advantages of greatly reducing dry gas yield and coke yield at the same time of converting the heavy crude oil into the high-octane value gasoline and the propylene so as to realize the high-efficiency utilization of oil resources.

The invention provides a preparation method of a lactic and glycolic acid. The method comprises a catalyst containing three compounds of a catalytic induction system. The catalyst catalyzes and induces ring cleavage copolymerization between diglycolide and lactide to synthesize lactic and glycolic acid. The monomer to catalyst (mol ratio) is at 20,000 to 500,000 and the reaction temperature is 100 to 220 DEG C for 1 to 200 hours with inert gas protection or in vacuum. The invention has the advantages of high transformation ration, low catalyst contents of products, high molecular weight, narrow molecular weight disposition, good heat stability, small degradation of high temperature molten, good uniformity of materials, and is provided with excellent biological degradability and biologicalcompatibleness. The lactic and glycolic acid prepared by the invention can be widely used for surgical operation suture, internal fixation of fracture, tissue repair, plastic surgery, anti-organic conglutination, medical slow release, organic engineering, etc.

The invention relates to a catalyst separating device and a method in the furfuryl alcohol production. The device comprises a furfuryl alcohol coarse product storage tank, a disk settling centrifuge, and a three-column filter centrifuge, wherein the furfuryl alcohol coarse product storage tank, the disk settling centrifuge, a recovery tank, a pulp pump and the three-column filter centrifuge sequentially connected through a pipe, and an clear liquid outlet of the disk settling centrifuge is connected to a distillation tower; and a residue liquid outlet of the disk settling centrifuge is connected to the recovery tank. A liquid outlet of the three-column filter centrifuge is connected to the furfuryl alcohol coarse product storage tank. The method includes (1) separating catalyst-carried furfuryl alcohol coarse product through the disk settling centrifuge, and allowing clear liquid to flow into the distillation tower; (2) separating the residue liquid in the three-column filter centrifuge, and discharging the filter residue; and (3) refluxing the filtrate into the furfuryl alcohol coarse product tank, and separating in the disk settling centrifuge again. Compared with the conventional method, the inventive method has high removal rate for removing catalyst from furfuryl alcohol coarse product (increased by about 30-60%), reduced catalyst content in distillation drainage, reduced environment pollution, shortened process route and reduced energy consumption.

The invention discloses a water disposing device, which comprises the following parts: photocatalytic water processor (1) with pipe connecting valve sequently, jet pump (13), film separator (18) and ejector (24), wherein the photocatalytic water processor (1) consists of reactor (2) and water collector (8); the cylinder-shaped baffle (6) separates reactor (2) into reacting area and separating area; the case support (25) and baffle support (26) are fixed among spherical closure head (10) of water collector, hopper-shaped closure head (7) of reactor and cylinder-shaped baffle (6); the baffle (5) is set between cylinder-shaped baffle (6) and square case (3); the tipping plate settler (4) is set between baffle (5) and square case (3); the steel rack (28) with ultraviolet lamp (11) is assembled on the top of water collector (8); the outlet pipe of ejector (24) possesses triplet to correlate the flow with inlet pipe on the side.