Praxair Technology, Inc.

Union Carbide Corporation

John H Ziemer

Ravindra F Pahade

Michael James Lockett

Vijayaraghavan Srinivasan

Dante Patrick Bonaquist

Walter J Olszewski

Bayram Arman

Arun Acharya

Harry Cheung

Joseph Alfred Weber

James B Wulf

Robert A Beddome

John Keller Howell

Cheryl Ann Engels

Anthony J Kurek, Jr

Mohannad Abdul-Aziz Rashad

A cryogenic air separation system having a main heat exchanger for processing feed air, said heat exchanger having a reversing heat exchanger function in an upward feed airflow countercurrent section and having a desuperheating function in a downward feed air flow cocurrent section.

Cryogenic air separation system with dual section main heat exchanger

A cryogenic rectification method wherein both nitrogen gas and liquid are efficiently produced from air employing one or two columns wherein refrigeration to drive the cryogenic separation is provided by a, preferably closed loop, multicomponent refrigerant fluid refrigeration circuit.

Cryogenic rectification method for producing nitrogen gas and liquid

A downflow heat exchanger, particularly applicable as the main condenser/reboiler of a double column cryogenic air separation plant, wherein liquid distribution for uniform flow is carried out above the vapor passages and the well distributed liquid is passed into the liquid passages, preferably angularly onto the bridge fins, and then down through the liquid passages cocurrently with vapor in adjacent vapor passages.

Downflow plate and fin heat exchanger for cryogenic rectification

A cryogenic rectification system for producing elevated pressure gaseous oxygen wherein pressurized liquid oxygen is vaporized against pressurized working fluid which is then turboexpanded to form a dual phase stream having both vapor and liquid fractions.

Cryogenic rectification system with dual phase turboexpansion

A cryogenic rectification system wherein nitrogen top vapor of a higher pressure column reboils the column to provide additional vapor upflow and liquid downflow reflux for increased column drive and improved oxygen recovery.

Cryogenic rectification system with improved oxygen recovery

A cryogenic rectification method wherein liquid from a top condenser-reboiler is cleaned of higher boiling impurities by passage through an adsorbent bed and returned to the condenser-reboiler, wherein the flow back to the condenser-reboiler is driven by combination with density-reducing vapor.

Air separation process with improved reboiler liquid cleaning circuit

A cryogenic process to efficiently produce large quantities of nitrogen gas at elevated pressure by use of a double column and multiple condenser-reboilers.

Double column multiple condenser-reboiler high pressure nitrogen process

A process to efficiently produce large quantities of elevated pressure nitrogen at a high recovery by the cryogenic separation of air employing two separate columns each of which is equipped with a top condenser and wherein the second column processes a feed stream obtained from the first column.

Dual column high pressure nitrogen process

Low purity oxygen is produced by a process which employs a low pressure column and a medium pressure column, wherein the bottoms of the low pressure column are reboiled against condensing air and the resulting condensed air is fed into both the medium pressure and the low pressure column.

Air boiling process to produce low purity oxygen

Low-purity oxygen is produced by fractional distillation of liquefied air. A gas turbine, powered in part by waste nitrogen from the distillation, supplies energy to compress the feed air. Compressing the waste nitrogen prior to turbine expansion provides an increase in energy efficiency.

Growing community of inventors

Grand Island, NY, United States of America

John H Ziemer