摘要:
To provide a process for safely producing a perfluoroacyl peroxide with good productivity.By supplying a perfluoroacyl halide-containing organic solvent solution, an aqueous solution of hydrogen peroxide or a metal peroxide, and an aqueous basic alkali metal compound solution to a tubular reactor to allow them to react with one another, in a flow rate ratio of, as represented by molar ratio of the compounds in the solutions, from 1.00 to 1.35 of the basic alkali metal compound and from 0.60 to 40 of hydrogen peroxide or the metal peroxide per 1 of the perfluoroacyl halide, the yield of a perfluoroacyl peroxide based on the material perfluoroacyl halide can be remarkably improved as compared with conventional technique.
摘要:
A conduit structure for molten glass, a conduit system for molten glass, a vacuum degassing apparatus and a method for vacuum-degassing molten glass by use of the vacuum degassing apparatus, which are capable of effectively removing components eluted from a refractory brick forming a conduit for molten glass, foreign substances generated in the interface between molten glass and a platinum wall surface forming a conduit for molten glass, a bubble remaining in a surface layer of molten glass, a glass material denatured by volatilization, and the like, are provided.A conduit structure for molten glass, which is formed of a hollow pipe made of platinum or a platinum alloy, includes a double-pipe structure disposed in at least a downstream portion of the conduit structure, the double-pipe structure being formed of an inner pipe and an outer pipe; the inner pipe having an upstream end and a downstream end formed as open ends; the outer pipe having a downstream end formed as a closed end in a region located in a gap between the inner pipe and the outer pipe and as an open end in a region located in the inner pipe in the double-pipe structure; the conduit structure having an upstream end formed as an open end; and the outer pipe having an opening formed in a portion close to the downstream end thereof.
摘要:
The present invention provides methods for labeling One or two oxygen atom(s) in a carboxyl group of a carboxyl-containing compound with an oxygen isotope selected from oxygen-17 (17O) or oxygen-18 (18O). The methods of the present invention are characterized in that an activated ester of the carboxyl-containing compound (carboxylic acid) is reacted with H217O or H218O in the presence of an activator. In the methods of the present invention, the reaction between the activated ester of a carboxylic acid and H217O or H218O can be allowed to proceed without including drastic conditions such as strongly acidic conditions or alkaline hydrolysis because an activator is used.
摘要翻译:本发明提供了将含羧基化合物的羧基中的一个或两个氧原子与选自氧-17(0-4O)或氧-18( <00> O)。 本发明的方法的特征在于,含羧基化合物(羧酸)的活化酯与H 2 O 2 O或H 2 在活化剂存在下进行反应。 在本发明的方法中,羧酸的活化酯与H 2 O 3或H 2 O 2的反应, 由于使用活化剂,可以不包括强酸性条件或碱性水解等剧烈条件进行18 O。
摘要:
A hatchback door structure for vehicles which includes an inner panel arranged on an inner side of a vehicle; and an outer panel arranged on an outer side of the vehicle, wherein the inner panel includes a frame which has a shape outlining an outer shape of the hatchback door, and a pair of stiffening ribs which is integrally formed with the frame and extends approximately in a V-shape to both side portions of the frame from a bottom side of the frame. Further, the inner panel is integrally formed by press-forming and includes a discrete lateral beam which is fixed and extends between jointing portions of the side portions of the frame and stiffening ribs, wherein, the discrete lateral beam is formed by press-forming, and a window frame on which a window glass is fixed is formed in an upper portion of the frame.
摘要:
A structure for attaching a striker, having an attachment bracket including a base fastened to a panel, and a protruding portion joined to the base. The protruding portion extends in a direction different from a direction in which the base is arranged. The striker may have a swelling portion which swells in a direction going away from the base, and is attached to the protruding portion. The structure may include a cover member for covering an outside of the attachment bracket, and a work hole for adjusting the position of the striker is formed in the cover member. Typically, the striker has a base plate and a striker main portion. The base plate is selectively approachable to and retreatable from the attachment bracket via screw members which are inserted through a through hole provided in the protruding portion of the attachment bracket and are adjustably screwed into the base plate.
摘要:
A thin Co--Fe--Ni magnetic film comprising from 40% to 70% by weight of cobalt, from 20% to 40% by weight of iron, and from 10% to 20% of nickel, and having a crystal structure of a mixed crystal with an .alpha. phase of a body-centered cubic structure and a .gamma. phase of a face-centered cubic structure.
摘要:
Dextransucrase synthesis of dextran from sucrose is inhibited by a novel homocitric acid oligoriboside derivative and its nontoxic salts. The new derivative is obtained by fermentation of certain Streptomyces sp. such as Streptomyces sp. MF 980-CF1 (FERM-P5430; ATCC 31820) and is useful in the prevention of dental caries.
摘要:
A core-shell silica having a high sphericity and a narrow particle distribution and a method for easily producing the core-shell silica which includes dispersing substantially non-porous silica core particles having a sphericity of at least 0.8 and a coefficient of variation of at most 0.2 in a dispersion medium containing an alcohol and water in the presence of a surfactant to prepare a dispersion; adding a silica material to the dispersion and reacting the silica material under a condition of pH of from 8 to 13 to form a shell precursor containing silica and the surfactant on the surface of each silica core particle; and removing the surfactant from the shell precursor to form a porous shell.
摘要:
The present invention provides methods for labeling One or two oxygen atom(s) in a carboxyl group of a carboxyl-containing compound with an oxygen isotope selected from oxygen-17 (17O) or oxygen-18 (18O). The methods of the present invention are characterized in that an activated ester of the carboxyl-containing compound (carboxylic acid) is reacted with H217O or H218O in the presence of an activator. In the methods of the present invention, the reaction between the activated ester of a carboxylic acid and H217O or H218O can be allowed to proceed without including drastic conditions such as strongly acidic conditions or alkaline hydrolysis because an activator is used.