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4430719 Calcination control system
New Patents
molecular weight C3-C8 hydrocarbons are injected into the reservoir and the production well is cyclically throttled. The production well flow rate is restricted until the bottom-hole pressure of the well has increased to an amount of about 30% to about 90% of the fluid injection pressure at the injection well. Thereafter, the production well is opened and oil is recovered therefrom as the bottom-hole pressure declines. The throttled production cycle may be repeated at appropriate intervals during the process.
4430256 REVERSE THERMODYNAMIC CHEMICAL BARRIER FOR NUCLEAR WASTE OVER-PACK OR BACKFILL Ro Rustum
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In a system for the separation of sour gases especially hydrogen sulfide and carbon dioxide from a raw gaseous mixture e.g., hydrogen-containing in order to form a purified gaseous mixture, comprising scrubbing the gaseous mixture in a first scrubbing stage with a physical scrubbing liquid e.g., methanol having a higher absorbability for hydrogen sulfide than for carbon dioxide, withdrawing from the scrubbing stage a first stream of scrubbing liquid loaded with hydrogen sulfide and carbon dioxide, and regenerating the loaded scrubbing liquid to form (a) a gaseous phase containing hydrogen sulfide, and (b) regenerated scrubbing liquid, the improvement of scrubbing said gaseous phase containing hydrogen sulfide in a second scrubbing stage with a stream of scrubbing liquid capable of absorbing additional H2S, e.g., a CO2depleted stream from an H2S enrichment column; and subjecting resultant second stream of scrubbing liquid loaded with hydrogen sulfide to a separation stage, preferably rectification, to form a bottoms of regenerated scrubbing liquid and an overhead of a gaseous phase rich in hydrogen sulfide irrespective of whether the raw gaseous mixture has a very low H2S concentration.
4430719 Radioactive waste is stored surrounded by an overpack or backfill containing non-radioactive ions of the same radioactive elements as in the waste form. In place of an overpack of the actinides, there can be used an overpack of the chemically similar lanthanides. Thus, there can be used in the overpack cesium and strontium containing aluminosilicates and cesium, strontium and lanthanide aluminates and silicates.
CALCINATION CONTROL SYSTEM Robert M Pearson assigned to Aluminum & Chemical Corporation
•~-~ ~
Kaiser
~
4430316 SCRUBBING SYSTEM YIELDING HIGH CONCENTRATION OF HYDROGEN SULFIDE Gerhard Ranke, Horst Weiss, Pfederal Republic Of Germana assigned to Linde Aktiengesellschaft
CON,M~_
Nuclear magnetic resonance (nmr) is employed for the control of heat-input or feed rate of calcination and/or drying facilities. The residual volatile material content of the heat-treated material is monitored by nmr and the results obtained from the monitoring are employed to adjust the heat-input or feed rate to avoid overdrying or calcining of the heat-treated material. A computer, such as a microprocessor, may be utilized in combination with the nmr apparatus to provide instantaneous process control.
molecular weight C3-C8 hydrocarbons are injected into the reservoir and the production well is cyclically throttled. The production well flow rate is restricted until the bottom-hole pressure of the well has increased to an amount of about 30% to about 90% of the fluid injection pressure at the injection well. Thereafter, the production well is opened and oil is recovered therefrom as the bottom-hole pressure declines. The throttled production cycle may be repeated at appropriate intervals during the process.
4430256 REVERSE THERMODYNAMIC CHEMICAL BARRIER FOR NUCLEAR WASTE OVER-PACK OR BACKFILL Ro Rustum
/4 ~.
X//,
.,~ , " - ~ / /, ~ / /. ~/ / _ /,'..\"
\Y/ANt
v
In a system for the separation of sour gases especially hydrogen sulfide and carbon dioxide from a raw gaseous mixture e.g., hydrogen-containing in order to form a purified gaseous mixture, comprising scrubbing the gaseous mixture in a first scrubbing stage with a physical scrubbing liquid e.g., methanol having a higher absorbability for hydrogen sulfide than for carbon dioxide, withdrawing from the scrubbing stage a first stream of scrubbing liquid loaded with hydrogen sulfide and carbon dioxide, and regenerating the loaded scrubbing liquid to form (a) a gaseous phase containing hydrogen sulfide, and (b) regenerated scrubbing liquid, the improvement of scrubbing said gaseous phase containing hydrogen sulfide in a second scrubbing stage with a stream of scrubbing liquid capable of absorbing additional H2S, e.g., a CO2depleted stream from an H2S enrichment column; and subjecting resultant second stream of scrubbing liquid loaded with hydrogen sulfide to a separation stage, preferably rectification, to form a bottoms of regenerated scrubbing liquid and an overhead of a gaseous phase rich in hydrogen sulfide irrespective of whether the raw gaseous mixture has a very low H2S concentration.
4430719 Radioactive waste is stored surrounded by an overpack or backfill containing non-radioactive ions of the same radioactive elements as in the waste form. In place of an overpack of the actinides, there can be used an overpack of the chemically similar lanthanides. Thus, there can be used in the overpack cesium and strontium containing aluminosilicates and cesium, strontium and lanthanide aluminates and silicates.
CALCINATION CONTROL SYSTEM Robert M Pearson assigned to Aluminum & Chemical Corporation
•~-~ ~
Kaiser
~
4430316 SCRUBBING SYSTEM YIELDING HIGH CONCENTRATION OF HYDROGEN SULFIDE Gerhard Ranke, Horst Weiss, Pfederal Republic Of Germana assigned to Linde Aktiengesellschaft
CON,M~_
Nuclear magnetic resonance (nmr) is employed for the control of heat-input or feed rate of calcination and/or drying facilities. The residual volatile material content of the heat-treated material is monitored by nmr and the results obtained from the monitoring are employed to adjust the heat-input or feed rate to avoid overdrying or calcining of the heat-treated material. A computer, such as a microprocessor, may be utilized in combination with the nmr apparatus to provide instantaneous process control.