Abstract: A method and apparatus are provided for producing a product comprising a carbide compound, such as for example silicon carbide. A reactor is provided which has a chamber defined therein which is divided into a combustion zone and a reaction zone. A combustible mixture is injected into the combustion zone in a direction generally toward the reaction zone, and is accordingly combusted in the combustion zone. At least one reactant (i.e. silane) is injected at the boundary between the zones into the reactor chamber in a direction generally parallel to the longitudinal axis of the chamber so as to react to form raw product comprising the carbide compound.

Abstract: A shell and tube heat exchanger is disclosed in which the distribution of the fluid on the shell is substantially improved by the positioning of flow-restrictive disks on the tubes near the inlet and outlet regions of the exchanger. Positioning of the disks in other regions of the exchanger is also disclosed in order to create turbulence and increased beat transfer.

Abstract: A method is provided for increasing reactant concentrations for the polymerization of PPS without creating a deterioration of the molecular weight of the resultant polymer by venting excessive by-product water during the polymerization reaction.

Abstract: The present invention provides a nonwoven composite and a process for making a nonwoven composite suitable for making shoe counters comprising: (1) dispersing an effective amount of a thermoplastic resin throughout the interstitial space of a nonwoven fabric having two fabric surfaces wherein the first fabric surface has a velvety or felt texture and the second fabric surface has a fused surface thereby forming a thermoplastic resin-loaded nonwoven fabric; thereafter heating said thermoplastic resin-loaded fabric in a manner which impregnates said thermoplastic resin onto the nonwoven fabric thus forming said nonwoven composite with one velvety or felt surface substantially free of thermoplastic resin in the absence of buffing.

Abstract: A process for preparing arylene sulfide polymers by contacting a sulfur source, a cyclic organic amide, and a dihaloaromatic compound to form a polymerization mixture, polymerizing the polymerization mixture and recovering the arylene sulfide polymer wherein the process is conducted in the presence of titanium dioxide.

Abstract: Films and fibers are prepared from arylene sulfide resins comprising first recurring units consisting of aromatic structures having the form: ##STR1## and second recurring units including units selected from aromatic structures having the form: ##STR2##

Abstract: According to this invention, improved results in terms of molecular weight and percent yield of aromatic sulfide/sulfone polymers are achieved by the employment of a low level modifying agent within a specific range in the polymerization reaction mixture. The modifying agent employed is a salt of an amino carboxylic acid. The salt can be employed as an already existing salt of an amino carboxylic acid or can be formed in situ by employing either an amino carboxylic acid and a base; or a lactam and a base.

Abstract: The present invention provides crosslinked ampholytic copolymers that are highly absorbent to aqueous electrolyte solutions.

Abstract: The present invention provides crosslinked ampholytic copolymers that are highly absorbent to aqueous electrolyte solutions.