Abstract: Method and apparatus are provided for collecting reaction product solids entrained in a gaseous outflow from a reaction situs, wherein the gaseous outflow includes a condensable vapor. A condensate is formed of the condensable vapor on static mixer surfaces within a static mixer heat exchanger. The entrained reaction product solids are captured in the condensate which can be collected for further processing, such as return to the reaction situs. In production of silicon imide, optionally integrated into a production process for making silicon nitride caramic, wherein reactant feed gas comprising silicon halide and substantially inert carrier gas is reacted with liquid ammonia in a reaction vessel, silicon imide reaction product solids entrained in a gaseous outflow comprising residual carrier gas and vaporized ammonia can be captured by forming a condensate of the ammonia vapor on static mixer surfaces of a static mixer heat exchanger.

Abstract: Method and apparatus are provided for collecting reaction product solids entrained in a gaseous outflow from a reaction situs, wherein the gaseous outflow includes a condensable vapor. A condensate is formed of the condensable vapor on static mixer surfaces within a static mixer heat exchanger. The entrained reaction product solids are captured in the condensate which can be collected for further processing, such as return to the reaction situs. In production of silicon imide, optionally integrated into a production process for making silicon nitride caramic, wherein reactant feed gas comprising silicon halide and substantially inert carrier gas is reacted with liquid ammonia in a reaction vessel, silicon imide reaction product solids entrained in a gaseous outflow comprising residual carrier gas and vaporized ammonia can be captured by forming a condensate of the ammonia vapor on static mixer surfaces of a static mixer heat exchanger.

Abstract: A method of forming a slip cast article is disclosed. The slip cast article is formed in a casting volume of a forming mold, which mold has a portion thereof formed of a meltable organic material. The vehicle of the casting slip used to form the article is drawn off to a level which provides a consolidated casting in the casting volume which contains sufficient vehicle that the casting is resistant to shrinkage. The consolidated casting and the organic mold portion are then surrounded with a porous, liquid drawing media. A high humidity of the vehicle of the casting slip is maintained about the consolidated casting surrounded by the porous, liquid drawing media. The consolidated casting and surrounding liquid drawing media are heated while the high humidity of the vehicle is maintained to a temperature which causes the meltable organic material to melt. The porous, liquid drawing media then draws the melted material away from the consolidated casting.

Abstract: A method of forming a slip cast article is disclosed. The slip cast article is formed in a casting volume of a forming mold which has a portion thereof formed of a dissolvable organic material which has binder properties. A casting slip is cast into the casting volume. The vehicle of the casting slip is drawn off to a level which provides a consolidated casting in the casting volume containing sufficient vehicle that the casting is resistant to shrinkage. The consolidated casting and the organic mold portion are placed in a solvent for the mold portion so that it may be dissolved. The solvent for the mold portion is one which is miscible with the vehicle of the casting slip. The consolidated casting is maintained in the solvent after the organic mold portion has been dissolved so that the dissolved organic material previously forming the mold portion may penetrate into the consolidated casting.