摘要:
Oxygenated compounds are prepared by reacting olefinically unsaturated compounds with carbon monoxide and hydrogen in the presence of a hydroformylation catalyst with suppression of the olefin hydrogenation side reaction if an acid is used in the reaction mixture. Typically, o-phthalic acid suppresses the formation of hexane and n-propanol, respectively, when 1-hexene and allyl alcohol are hydroformylated.
摘要:
The resiliently coated metallic finger seal described herein is formed of two metallic seal members being fixed together at one end with fingers projecting rearwardly therefrom. The fingers on each member are offset so that the slits of each metallic seal member are not aligned. The fingers of the two members are then encapsulated by a resilient coating material, such as a room temperature vulcanizing silicone rubber. The seal means is described as annular and can be constructed of one piece or a plurality of sections. In constructing the seal means the metallic seal members are cleaned, primed where it is desired to have the resilient coat permanently affixed, and the resilient coat is then applied. The resilient coat does not cover the entire fingers so that the proper flexibility at the hinge location will reamin. After curing of the resilient coating material a heat reflecting and lubricating material is placed thereon.
摘要:
A vapor phase process for preparing allylic alcohols which comprises reacting an allylic ester of a lower alkyl carboxylic acid with a lower alkanol in the presence of a zeolite transesterification catalyst.
摘要:
A process comprising (1) hydroformylation of allyl acetate or 1-propenyl acetate to form isomeric acetoxybutyraldehydes, and (2) recycle of the mixture obtained by dehydroformylation of at least a portion of the acetoxybutyraldehyde isomers as feedstock in (1).
摘要:
The temperature requirements for hydrolysis of a non-phenolic haloaromatic compound by a concentrated aqueous hydroxide solution are lowered by the presence of a phenolic compound.
摘要:
A process for preparing diols which comprises reacting diol esters with a lower alkanol in the presence of a transesterification catalyst comprising magnesia.
摘要:
An apparatus for protecting a floatation device includes an elongate body, the elongate body including a closed front end and an open back end, a securing mechanism removably attached to the open back end of the elongate body wherein the securing mechanism is configured to secure a floatation device in the elongate body. The apparatus for protecting a floatation device is useful for protecting a floatation device such as a pontoon on a watercraft. The apparatus for protecting a floatation device slides over the front end of the pontoon and is secured by a securing mechanism at the rear end of the pontoon to prevent the pontoon from coming into direct contact with rocky shores and docks.
摘要:
A milling cutter for cutting a workpiece in both right and left-handed rotary directions is provided that comprises a rotatable cutter body having at least one pair of right and left-handed insert seats disposed on its periphery, an indexable wedge for each pair of right and left-handed insert seats, and a mounting screw for each of the wedges for securing the wedges in a clamping position with respect to a right or left-handed insert seat. Each of the wedges may be used to secure an insert in the right or left-handed seat of its respective seat pair by loosening or removing the mounting screw, and turning the wedge 180.degree.. Each wedge includes a front end for wedgingly engaging an insert in either the right or left-handed seat, and a back end for wedgingly engaging an opposite surface of the unused insert seat in order to more securely clamp the insert in place. The back end of each wedge includes an offset portion that is receivable in and semi-complementary in shape to the unused insert seat for still more stability.
摘要:
An improved method for compression molding of typically brittle ceramic materials comprising uranium dioxide which enhances their compacting and cohering properties in the manufacture of nuclear fuel products. The uranium dioxide is mixed with a fugitive binder comprising a high molecular weight acrylic acid polymer and ammonium bicarbonate. The mixture is then pressed and sintered to expel the binder and to give a fissionable nuclear fuel pellet.
摘要:
A corrutherm expansion fixture is provided for supporting a part in a desired configuration during a brazing operation. The fixture includes a discontinuous corrugated ring formed from material which is expansible when subjected to high temperature. The fixture also includes a continuous inner ring and a discontinuous outer ring between which the corrugated ring is disposed. The inner ring resists inward movement of the corrugated ring when expansion force is exerted by the corrugated ring. The outer ring supports the part to be brazed and transmits the expansion force to the part to retain it in the desired configuration as the force is exerted on the outer ring by the corrugated ring.