A method and system are provided to recover water and carbon dioxide from combustion emissions. The recovery includes, among other things, electrolysis and carbon dioxide capture in a suitable solvent. The recovered water and carbon dioxide are subject to reaction, such as a catalytic methanation reaction, to generate at least methane.

Integrated systems are provided for the production of higher hydrocarbon compositions, for example liquid hydrocarbon compositions, from methane using an oxidative coupling of methane system to convert methane to ethylene, followed by conversion of ethylene to selectable higher hydrocarbon products. Integrated systems and processes are provided that process methane through to these higher hydrocarbon products.

A process for producing ammonia and a derivative of ammonia from a natural gas feed comprising conversion of natural gas into a make-up synthesis gas; synthesis of ammonia; use of said ammonia to produce said derivative of ammonia, wherein a portion of the natural gas feed is used to fuel a gas turbine; power produced by said gas turbine is transferred to at least one power user of the process, such as a compressor; heat is recovered from exhaust gas of said gas turbine, and at least part of said heat is recovered as low-grade heat available at a temperature not greater than 200 C., to provide process heating to at least one thermal user of the process, such as CO.sub.2 removal unit or absorption chiller; a corresponding plant and method of modernization are also disclosed.

A multi-tubular chemical reactor includes an igniter for the initiation of gas phase exothermic reaction within the gas phase reaction zones of the tubular reactor units.

A process for the preparation of ethylene homopolymers or copolymers in a facility having a high-pressure tubular reactor and a preheater, wherein a reaction fluid introduced into the reactor at a reactor inlet is heated in the preheater and the average velocity of the reaction fluid in the preheater is lower than the average velocity of the reaction fluid in the tubular reactor and the ratio of the average velocity in the tubular reactor to the average velocity of the reaction fluid in the preheater is in the range from 1.5 to 5.

A reactor tank is provided having an enzyme inlet, a heating jacket positioned around the exterior center of the tank, a gas outlet for communicating with a vacuum apparatus to create a vacuum within the reactor tank and for communicating with a condensing unit, a first gas inlet for receiving gas from a feed tank and a first liquid outlet for recirculating the liquid from the first liquid outlet back to the feed tank. The reactor tank further includes a sparged unit and a screen positioned within the tank between the sparged unit and the first liquid outlet, where the sparged unit is connected to the first gas inlet for receiving gas from the feed tank. The reactor tank is utilized in a reactor system further including a condensing unit, vacuum pump or venturi valve, a first feed tank connected to the first gas inlet, a coalescer having at least one circulation pipe and a first circulation pump connected to the first liquid outlet for circulating a portion of the liquid dispelled from the liquid outlet to the coalescer, which after being filtered through coalescer is recirculated through circulation pipe back to the first feed tank.

A method for producing a cyanide including the steps of supplying a hydrocarbon and nitrogen source to an onsite plasma reactor and removing cyanide synthesised inside the onsite plasma reactor to thereby produce the cyanide is disclosed. Also disclosed is a method which includes a monitor for monitoring the cyanide requirement of an onsite cyanide utilising system and supplying the hydrocarbon and nitrogen source in accordance with the cyanide requirement. Additionally, a method for recovering, refining, purifying or treating a metal including the steps of monitoring a cyanide requirement of the method and supplying to the method in a just in time sequence a cyanide synthesised onsite to thereby recover, refine, purify or treat the metal is disclosed.

Systems and processes for rapidly depressurizing a reactor system are disclosed. The systems and processes are particularly useful in the high pressure polymerization of ethylene.

A system for processing fuel to remove sulfur species through the oxidation of the sulfur species is disclosed which includes one or more (and preferably two or more processing units). Additionally, a method of removing sulfur species through the oxidation of the sulfur species is also disclosed. The system and the method rely on the use of aqueous and does not require the removal (through sorption or the like) at each or between each processing unit. Such a configuration for numerous reasons is economically advantageous.

Disclosed are a graphene material production device and a system including the device. The device includes: a first reaction component, a second reaction component and a negative pressure generating component. The first reaction component includes a first reaction chamber and a first material outlet arranged at a bottom of the first reaction chamber. The second reaction component includes a second reaction chamber and a second material inlet. A connecting passage between the first material outlet and the second material inlet is provided with a valve. A suction hole of the negative pressure generating component is provided inside the second reaction chamber. The use of the device in the process of producing a graphene material by a redox method can overcome the problem that the viscous material is difficult to transfer, thereby reducing the production difficulty and effectively improving the production efficiency of graphene materials.