Praxair Technology, Inc.

Mark J Roberts

Dante Patrick Bonaquist

Neil Mark Prosser

Harry Cheung

Robert A Beddome

Henry Edward Howard

Arun Acharya

John Henri Royal

Thomas John Bergman, Jr

James R Dray

Carl Joseph Heim

Alfred M Czikk

Paul Louis Just

James Brian Mize

A cooling system includes a unit for processing product to be cooled or frozen. A secondary refrigeration loop is connected to this unit and introduces a refrigerant at or near atmospheric pressure into the unit. The secondary refrigeration loop may be open or closed. The secondary loop includes a secondary heat exchanger for cooling the refrigerant. A primary, closed refrigeration loop, operating at a pressure of not less than 2 atmospheres, includes a forward flow path which comprises a primary refrigerant compressor for producing compressed primary refrigerant, a primary heat exchanger for receiving and cooling the compressed primary refrigerant and an expander for further cooling and transferring the compressed refrigerant to the secondary heat exchanger to enable cooling of the secondary refrigerant. The primary loop further includes a return flow path from the secondary heat exchanger to the primary refrigerant compressor and to the primary heat exchanger. The primary heat exchanger thereby provides heat exchange from the return flow path to the forward flow path to accomplish a cooling action.

Cooling system employing a primary, high pressure closed refrigeration

A cryogenic air separation system which improves argon recovery wherein vapor from the argon column top condenser is turboexpanded to generate refrigeration and is then passed into the lower pressure column.

Cryogenic rectification system with enhanced argon recovery

A cryogenic rectification system for producing large quantities of elevated pressure nitrogen employing an additional column operating at a pressure intermediate to that of higher and lower pressure columns, thereby optimizing nitrogen recovery by improving the flexibility of refrigeration production.

Cryogenic rectification system for producing elevated pressure nitrogen

A cryogenic rectification system wherein feed partially traverses the primary heat exchanger, thereafter is turboexpanded, and then traverses another portion of the primary heat exchanger reducing the temperature differences between approaching streams within the primary heat exchanger and thus the cycle irreversibilities resulting in lower power requirements.

Cryogenic rectification system with intermediate temperature

A cryogenic rectification system wherein nonproduct fluid from a cryogenic rectification plant is compressed and mixed with incoming feed at an intermediate temperature, and the resulting mixture passed into the cryogenic rectification plant enabling production of product with improved recovery especially at elevated pressure.

Cryogenic rectification system with improved recovery

A cryogenic rectification system wherein compressed feed is further compressed in a compressor coupled to a turboexpander and turboexpanded through the turboexpander to drive the compressor, and a portion of the feed which does not undergo turboexpansion is condensed against liquid oxygen in a product boiler.

Cryogenic rectification system with liquid oxygen boiler

A single column lower pressure cryogenic rectification system wherein nitrogen top vapor is condensed against column bottoms, elevated in pressure, and vaporized against elevated pressure fluid to achieve simultaneously high purity and high pressure nitrogen gas product.

Single column cryogenic rectification system for producing nitrogen gas

A direct sequenced three column cryogenic rectification system wherein material flow is unidirectional from higher to lower pressure through the system enabling high recovery of each of the three major components of feed air.

Triple column cryogenic rectification system

A cryogenic rectification system for producing elevated pressure product wherein the lower pressure column of a two column system is operated at elevated pressure and nitrogen-containing fluid taken from the upper portion of the lower pressure column is used to generate plant refrigeration and to regenerate feed purifier adsorbent beds thus avoiding the need for any feed expansion.

Growing community of inventors

Grand Island, NY, United States of America

Mark J Roberts