37results about How to "Reduce hydrocarbon content" patented technology

An improved production water treatment system and method are disclosed. The treatment apparatus includes a vertically oriented vessel with tangentially disposed injection nozzles including one or more injection nozzles for the introduction of production water and one or more injection nozzles for the introduction of recycled water from the vessel and a sparge gas. The tangential orientation of the injection nozzles creates a cyclonic flow within the vessel for improved sparge gas bubble/hydrocarbon contact. A hydrocarbon-rich layer migrates to the top surface of the liquid in the vessel where it is removed about a center axis of the vessel. The resulting hydrocarbon-lean production water has a sufficiently low hydrocarbon content that it is eligible for more intensive processing, such as with organophillic clay cartridges.

Provided is a particulate sorbent composition comprising a zinc titanate support loaded with a promoter metal in a substantially reduced valence state selected from the group consisting of cobalt, nickel, iron, manganese, copper, molybdenum, tungsten, silver, tin and vanadium, or mixtures thereof , for desulfurizing a cracked gasoline or diesel fuel feed stream in a desulfurization zone by contacting said feed stream in a desulfurization zone with a particulate adsorbent composition and then subjecting the resulting low sulfur content The stream is separated from the sulfided sorbent, which is then regenerated and activated before being recycled back to the desulfurization zone.

A spark-ignition engine capable of reducing the content of hydrocarbon in exhaust gas is provided. When viewed from a direction parallel to a cylinder center axis, given a central virtual line passing a squish area maximum-width section and the center of a combustion chamber recessed section, and one area a and the other area b divided by the central virtual line, an intake valve port or an exhaust valve port is opened in one area of any opposed section of opposed sections of the combustion chamber recessed section. A spark-plug attachment hole is formed in the other area of the opposed section, such that, when viewed from the direction parallel to the cylinder center axis, a spark discharge section at a tip of a spark plug does not overlap the central virtual line.

The invention discloses an inferior diesel pour-point depressing modification method, which comprises the following contents: (1) an inferior diesel material and a powdery hydrofining catalyst are fully mixed in a mixer to obtain a mixed feed of the catalyst and the raw oil; (2) the mixed feed and hydrogen enter a boiling-bed reactor from the bottom of a reactor filled with a mixture of a hydrodewaxing catalyst and a hydro-upgrading catalyst to undergo a hydrogenation reaction; (3) the reaction product is charged out of the top of the boiling-bed reactor and then enters a stable reactor to supplement hydrofining; and (4) the material undergoes solid-liquid separation, and a liquid phase enters a fractionating system so as to obtain a diesel product with high quality, low pour point, low sulfur content and high cetane number. According to the method, the backmixing characteristic of the boiling-bed reactor is fully utilized, and cooling and hydrofining of the hydrodewaxing process and temperature rising of the hydro-upgrading process are reasonably utilized. Therefore, the diesel with low pour point and ultra-low sulfur content is produced, cetane number is raised, hot-spot temperature of the device is reduced, running period is prolonged, and operation expenses are saved.

The present invention provides a composition comprising 10-40 mass! of C_8-30 linear alkanes, up to 20 mass % of C_7-20 aromatic hydrocarbons, at least 90 mass % of which are monoaromatic, and no more than 1 massl in total of oxygen containing compounds; wherein the total amount of C_8-30 alkanes in the composition is 50-95 mass % (and the total amount of C_8-30 alkanes, C_7-20 aromatic hydrocarbons and C_8-30 cycloalkanes is at least 95 massl; and wherein the amounts are based on the mass of the composition. Also provided is a method for producing the composition comprising the step of hydroprocessing a biological feedstock using a catalyst and the step of fractionating the product of the hydroprocessing step.

The invention discloses a coal tar full-fraction fluidized bed-fixed bed combined treatment process. The combined treatment process comprises the following steps: feeding a full-fraction coal tar rawmaterial and an auxiliary agent into a pretreatment tank for mixing; carrying out liquid-solid separation after mixing treatment; a liquid-phase material obtained after separation enters a fluidized bed hydrogenation reaction unit for a hydrogenation reaction; feeding the obtained reaction outflow into a separation tank to be subjected to gas-liquid separation, thus forming a gas-phase material and a liquid-phase material after separation, and then separating the liquid-phase material into a first liquid-phase material and a second liquid-phase material, returning the first liquid-phase material to the pretreatment tank; feeding the second liquid-phase material to a fixed bed hydrogenation reaction unit for hydrogenation reaction; and fractionating the reaction outflow to prepare naphtha,diesel oil and hydrogenated tail oil. The process provided by the invention can realize efficient utilization and long-period operation of coal tar resources.

The invention discloses a process apparatus and method of nitrogen-containing natural gas dual-column cryogenic denitrification. The process apparatus comprises a denitrification cold box and a high-pressure denitrification column connected through a pipeline; a bottom outlet of the high-pressure denitrification column, the denitrification cold box and the high-pressure denitrification column areconnected in sequence; an upper outlet of the high-pressure denitrification column, a heat exchanger, the denitrification cold box and a low-pressure denitrification column are connected in sequence;a top outlet of the low-pressure denitrification column, the denitrification cold box, an ammonia compressor, a cooler, the denitrification cold box and a top feed port of the low-pressure denitrification column are connected in sequence; a bottom outlet of the low-pressure denitrification column, a fourth throttle valve, the denitrification cold box, a product gas compressor and the cooler are connected in sequence. Compared with the prior art, the process apparatus and method have the advantages the hydrocarbon content in nitrogen is greatly decreased, the purity of removed nitrogen is >/=99% by mol; cold is provided for the system after throttling of denitrified liquid hydrocarbon, external coolant circulation is canceled, and energy consumption of the apparatus is decreased.

The invention discloses a production method of high-quality low-pour-point diesel. The production method comprises the following steps: (1) adequately mixing a poor-quality diesel raw material with a powdery hydrorefining catalyst in a mixer, so as to obtain a mixed fed material of the catalyst and the raw material diesel; (2) introducing the mixed fed material and hydrogen into a boiling-bed reactor from the bottom of a reactor filled with a hydrodewaxing catalyst, and carrying out hydrogenation reaction; (3) after the reaction of the material containing the powdery hydrorefining catalyst, discharging the material from the top of the boiling-bed reactor, introducing the material into a stable reactor, and carrying out supplementary hydrorefining; and (4) filtering the powdery hydrorefining catalyst from generated diesel, and introducing the diesel into a fractionating system, so as to obtain the high-quality low-pour-point diesel product. By virtue of the method, the yield and cetane number of the diesel are increased when low-pour-point and ultralow-sulfur diesel is produced, the hot-spot temperature of a device is reduced, and the operation cycle is prolonged; and besides, the consumption of cold hydrogen or the fuel gas of a heating furnace is reduced, so that the operation cost is saved.

The invention discloses an acid hydrocarbon separation and recycling device of a sulfuric acid alkylation system. The acid hydrocarbon separation and recycling device comprises a reactor, a storage tank, a primary settling tank, a secondary settling tank and a hydrocarbon compressor, wherein the primary settling tank is connected with the reactor through a first pipeline and a second pipeline respectively; the outlet end at the upper end of the primary settling tank is connected with the inlet end at the upper end of the secondary settling tank through a third pipeline; the outlet end at the upper end of the secondary settling tank is connected with the input end of the hydrocarbon compressor through a fourth pipeline; the outlet end at the lower end of the secondary settling tank is connected with the storage tank through a fifth pipeline; the output end of the hydrocarbon compressor is connected with the reactor through a sixth pipeline. By adopting the technical scheme of the invention, acid hydrocarbon can be separated, a good separation effect can be achieved, stability and reliability are achieved, consumption of the device is reduced, the cost is lowered, and the security ofthe storage tank is also ensured.

The invention discloses an efficient hydro-upgrading method for poor diesel fuel. The method comprises the following steps of (1) fully mixing the raw material of poor diesel fuel and a powdery hydrorefining catalyst in a mixer to obtain a mixed feeding material; (2) enabling the mixed feeding material and hydrogen to enter a boiling-bed reactor from the bottom part of a reactor filled with a hydrodewaxing catalyst, a hydro-upgrading catalyst and an isomerization-visbreaking catalyst, so as to implement the hydrogenation reaction; (3) discharging the reaction product comprising the powdery hydrorefining catalyst from the top part of the boiling-bed reactor, enabling the reaction product to enter the stable reactor to supplement hydrorefining; and (4) implementing solid liquid separation on the material, and enabling the liquid phase to enter a fractionating system to obtain a high-quality diesel fuel product. The characteristic of backmixing of the boiling-bed reactor is fully utilized, the temperature drop in the process of hydrodewaxing and the temperature rise in the processes of hydrorefining and hydro-conversion are reasonably utilized, the diesel fuel with low condensation point, ultralow sulfur and high cetane number is produced while the high yield of the diesel fuel is guaranteed, the hot-spot temperature of the device is reduced, and the running period is prolonged.