E.i. Dupont De Nemours and Company

Invista North America S.a.r.l.

Benny E Blackwell

Sourav Kumar Sengupta

Mehrdad Mehdizadeh

Theodore Augur Koch

Karl Robert Krause

Carmo Joseph Pereira

Gregory S Kirby

Luis Alberto Chu

Steven Lamar Grise

Wayne B Ely

Zeru Berhane Tekie

Monroe Davis

Robert Joseph Flowers

Cynthia K Fallon

The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of pH and stripping in combination with reboiler or evaporators reduces hydrogen sulfide concentration. The ammonium salt is produced as an aqueous solution, which may crystallized to form a solid product. The ammonium salt solution or solid may be used as a fertilizer.

Process for scrubbing ammonia from acid gases comprising ammonia and hydrogen sulfide

Elevated temperature, gas-phase, catalyzed processes for preparing HCN in which induction heating is used as a source of energy, and novel apparatus for carrying out said processes.

Induction-heated reactors for gas phase catalyzed reactions

This invention relates to improvements in processes and catalysts for elevated temperature, gas phase, catalyzed reactions in general; it is particularly illustrated by reference to the manufacture of hydrogen cyanide.

Gas phase catalyzed reactions

An improved induction heated reactor apparatus involving a reaction zone with inlet and outlet and containing an array of electrically conductive catalyst entities (susceptor entities) comprising pellets, rings, or rods containing a core externally coated with a substantially uniform and complete catalyst metal (e.g., platinum, platinum-iridium alloy, or platinum-rhodium alloy) wrap, coating, or surface impregnated, or containing the catalyst metal as a foam which are inductively heated to produce chemical product from a catalytic reaction. Such an apparatus is particularly useful in the catalytic generation of HCN at elevated temperatures.

Induction heated reactor apparatus

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Newark, DE, United States of America

Benny E Blackwell