Abstract:
Verfahren zur Herstellung von Kohlenstoffmolekularsieben für die Gewinnung von Stickstoff aus Luft, bei dem ein Vorprodukt bei Temperaturen von 800 - 900 °C mit Wasserdampf schwach aktiviert und das schwach aktivierte Produkt bei 750 - 850 °C mit Kohlenstoff abspaltenden Kohlenwasserstoffen behandelt wird, wobei ein handelsübliches, auf der Basis von Kokosnussschalen hergestelltes Kohlenstoffmolekularsieb bei Temperaturen von ca. 800 °C mit Wasserdampf aktiviert wird und anschließenden bei der gleichen Temperatur mit Kohlenstoff abspaltenden.
Abstract:
An adsorbent for separating nitrogen from a mixed gas of oxygen and nitrogen, characterized in that it is a MSC (molecular sieving carbon) satisfying the following formula: (t 95 /t 50 ) 35 wherein &agr; represents a separation ratio of oxygen and nitrogen, t 50 represents the time required for adsorbing 50 % of an equilibrium adsorption amount of oxygen, and t 95 represents the time required for adsorbing 95 % of an equilibrium adsorption amount of oxygen; and a method for separating nitrogen from a mixed gas of oxygen and nitrogen which employs the PSA (pressure swing adsorption) method and uses the absorbent. The method allows the reduction of the amount of an adsorbent used for a given amount of nitrogen generated, which leads to the saving of an equipment cost, the miniaturization of an apparatus and the reduction of a power consumption.
Abstract:
A method of producing an oxide of manganese including reacting, in a first aqueous solution, a manganese salt and an alkali agent to form manganese hydroxide; separating the manganese hydroxide from the first solution; mixing the manganese hydroxide into an aqueous medium to form a manganese hydroxide suspension; mixing the manganese hydroxide suspension with alkali metal hydroxide to form a second aqueous solution; and oxidizing the manganese hydroxide in the second aqueous solution to form an oxide of manganese. The dried oxide of manganese includes birnessite, a maximum of 20% hausmannite, and a maximum of 10% feitknechtite, may further include a maximum of 400 ppm of anions, may have a specific surface area of at least 25 m2/g, and may have an average oxidation state of greater than 3.5.
Abstract:
An adsorbent for nitrogen separation comprising molecular-sieve carbon prepared by the halogenation, dehalogenation followed by micropore adjustment of carbonized coal. The adsorbent can increase the quantity of nitrogen generated per unit quantity thereof, enhance the nitrogen yield, and reduce the nitrogen production cost. An adsorbent for carbon dioxide or methane comprising activated carbon prepared by the halogenation, dehalogenation followed by activation of carbonized coal can adsorb the gas in an increased quantity.
Abstract:
Process for obtaining nitrogen from air or nitrogen-containing gases by pressure exchange adsorption and desorption on two alternately operated adsorbers filled with carbon molecular sieves, whereby air is passed through the adsorber so that the oxygen is adsorbed and enriched nitrogen is obtained, while at the same time the other adsorber is regenerated by pressure relief, whereby in a first carbon molecular sieve layer (on the air intake side) of the two adsorbers, making up 1/20 to 1/2 of the entire carbon molecular sieve layer, a carbon molecular sieve A is inserted serving at the same time to take the residual moisture and for gas separation, and in a second carbon molecular sieve layer (on the air outlet side) a carbon molecular sieve B is inserted serving solely for gas separation, and carbon molecular sieve A has a relative volume of 3.0 to 3.4 while B has a relative volume of 2.3 to 2.95.
Abstract:
Method for purification of ammonia or mixtures of nitrogen and hydrogen, or nitrogen, hydrogen and ammonia, according to which: a) ammonia or a mixture of gases under pressure of from 0.1 to 25 MPa is passed through a column packed with aluminium oxide with a large specific surface area; b) the ammonia or mixture of gases is then passed through a column packed with CaO, NaOH, KOH or an NaOH/KOH melt, separately or in a mixture, at 20 to 70°C and under pressure of from 0.1 to 25 MPa; c) next, the ammonia or mixture of gases is passed through a column packed with activated carbon having a specific area of 100÷3000 m2 /g with sodium, potassium, caesium, magnesium, calcium, strontium, barium or cerium nitrates(V) or nitrates(III) deposited on its surface, separately or in a mixture; the aforementioned steps being realised in a serial process at a gas stream flow rate in the range of 100 dm3/h to 1000 m3/h.
Abstract:
A method for concentrating a single gas component from a gas mixture is disclosed. The method utilizes concentration units and recovery units to concentrate the single gas component which is often at very low concentrations in the gas mixture. This method allows for the recovery of a valuable gas depending upon application such as oxygen and Ar-40.