11results about "Refining by dialysis" patented technology

The technology relates to the use of a high salinity produced water stream from a gas oil separation plant (GOSP), as a wash water stream for the desalter unit in a GOSP. The produced water stream is pretreated by a sequence of steps and subsequently desalinated by a ultra-high pressure reverse osmosis (UHP-RO) membrane. The UHP-RO produces a permeate stream and a reject stream. A portion of the permeate stream is reused as a wash water stream in the desalter unit of the GOSP.

This invention discloses a device for filtering catalytic oil slurry using ceramic membranes, relating to the field of filtration equipment technology. It includes multiple sets of ceramic membrane mounting assemblies arranged in a ring. Each ceramic membrane mounting assembly includes a ceramic membrane body and an outer cylinder. An upper connecting assembly and a lower connecting assembly are respectively installed at the upper and lower ends of the assembly. The lower connecting assembly is connected to a sinking control assembly. The side wall of the outer cylinder is connected to a filter collection pipe. An upper retainer and a lower retainer are provided between the outer cylinders, with the lower retainer sleeved to the outer cylinder. A rotation mechanism is provided at the center of the upper retainer, and a lifting mechanism is provided on the lower side of the upper retainer. The lifting mechanism drives the lower retainer to move up and down. By lifting the outer cylinder where the ceramic membrane body breaks, and combining this with the sinking control assembly to sink the lower connecting assembly, the ceramic membrane body can be quickly replaced, ensuring the filtration efficiency of the catalytic oil slurry.

The invention provides a CAU-10-pydc membrane, a preparation method thereof and application of the CAU-10-pydc membrane in separation of hexane isomers. The preparation method comprises the following steps: mixing a metal salt, an organic ligand and a deprotonation agent in a solvent, and carrying out homogeneous reaction to obtain a CAU-10-pydc nanocrystal; cAU-10-pydc nanocrystals are dispersed on the surface of a supporting body, the supporting body is added into a reactor containing metal salt, an organic ligand, a deprotonation agent and a solvent to be subjected to a hydrothermal synthesis reaction, a CAU-10-pydc membrane is formed, and the membrane material has high integrity, durability and high compactness. The preparation method of the CAU-10-pydc film is simple and easy to operate, the synthesis condition is mild, the raw materials are green and low in cost, and the preparation method is suitable for large-scale production; when the CAU-10-pydc membrane is applied to separation of hexane isomers, separation of hexane isomers with low octane number and hexane isomers with high octane number can be realized.

The present application relates to a method for separating normal and isomeric alkanes in naphtha by inorganic membrane, which matches the membrane separation process with the actual working condition in industrial application to realize continuous production and directly obtain the purified product. The process first carries out hydrogenation pretreatment on full-range naphtha, then directly enters the membrane separation unit without pressure and temperature adjustment, and then obtains separated normal / isomeric alkane products, and finally enters the subsequent application production unit. The product rich in normal alkanes obtained on the permeation side after membrane separation can be used as high-quality raw material for the subsequent ethylene cracking section, and the product rich in isomeric alkanes obtained on the retentate side can be used as high-quality catalytic reforming or high-quality gasoline raw material. Coupling the membrane separation with the naphtha production process does not introduce the third component, is simple to operate, and has low energy consumption. The present application mainly solves the practical problems in the prior art, such as the difficulty in recovering the adsorbent, the large amount of desorbent, and the high energy consumption in the separation process when the adsorption method is used to separate normal and isomeric alkanes.

This invention relates to the fields of biomass oil processing and liquid hydrocarbon refining technology, and discloses a method for refining crude oil from pyrolysis of Ulva prolifera based on multi-stage membrane separation. The method includes: mixing crude oil from pyrolysis of Ulva prolifera with a n-alkane solvent to perform solvation reconstruction; inducing the precipitation of large-molecule polar impurities by utilizing differences in solubility parameters and performing solid-liquid separation; introducing the resulting degummed hydrocarbon oil into a multi-stage membrane separation system; performing component screening using a modified polytetrafluoroethylene membrane; and applying periodic pressure pulses to the permeate side. This invention utilizes the negative pressure difference generated during the pressure drop phase to drive a reverse flushing action, stripping adsorbates from the membrane interface, maintaining the distribution of hydrophobic components at the interface, and in principle avoiding thermally excited free radical polymerization reactions. This effectively solves the technical obstacle of difficult separation of polar components and hydrocarbon molecules, achieving membrane interface maintenance without downtime, and ensuring the thermodynamic stability of the refined hydrocarbon oil product.

In an embodiment is provided a process to re-refine used oil that includes introducing a used oil and a solvent to a separation unit under separation conditions selected to produce a purified oil product, the separation unit comprising a porous membrane, a semiporous membrane, or both; and separating the used oil to obtain an effluent comprising a purified oil product. In another embodiment is provided an apparatus for re-refining used oil that includes a separation unit comprising a porous or semiporous membrane; a used oil feed coupled to an inlet of the separation unit; and an inlet of a diffusate collection unit coupled to an outlet of the separation unit. In another embodiment is provided a composition generated from a membrane separation process that includes a base oil, the composition having a soot content of about 0.05% or less.

The present application relates to a method for separating C5 / C6 alkane isomers, in particular to a method for separating C5 / C6 alkane isomers by using multi-channel hollow fiber MFI molecular sieve membrane. The present application provides a method for separating C5 / C6 alkane isomers by using multi-channel hollow fiber MFI molecular sieve membrane, which comprises the following steps: feeding a fluid containing C5 / C6 alkane isomers into a MFI membrane assembly for separation to obtain normal alkane and isomeric alkane, wherein the MFI membrane assembly comprises several multi-channel hollow fiber MFI molecular sieve membranes, and the several multi-channel hollow fiber MFI molecular sieve membranes are prepared by batch integrated production.

The main purpose of the present invention is to prevent the deterioration in reaction yield in a conversion reaction from a raw material gas comprising hydrogen and carbon oxide to a liquid fuel. A liquid fuel production system according to an embodiment of the present invention is provided with: a liquid fuel synthesis unit which allows a conversion reaction from a raw material gas containing at least hydrogen and carbon oxide to a liquid fuel to proceed; a raw material gas supply unit which supplies the raw material gas into the liquid fuel synthesis unit; and a raw material gas circulation unit which re-supplies a remaining portion of the raw material gas, which contains an unreacted portion of the hydrogen, an unreacted portion of the carbon oxide and an acidic by-product of the conversion reaction, from the liquid fuel synthesis unit into the raw material gas supply unit. In the liquid fuel production system, the raw material gas supply unit includes: a mixing unit which mixes an amine compound with the remaining portion of the raw material gas in the presence of water vapor; and a water removal unit which removes a neutralization product between the amine compound and the acidic by-product together with condensed water of the water vapor.

The invention relates to a covalent triazine membrane for efficient separation of aromatic hydrocarbon-alkane as well as a preparation method and application of the covalent triazine membrane. Wherein the covalent triazine membrane is prepared by a sol-gel method, and a monomer blending strategy is utilized, and a rigid arene-philic three-dimensional structure is introduced, so that the structure and the chemical performance of a compact triazine framework membrane are adjusted. When the covalent triazine membrane is applied to dearomatization of diesel oil, the covalent triazine membrane is subjected to three-stage membrane separation, so that the obvious enrichment of aromatic hydrocarbon from 50% to 85.9% is realized. Compared with the prior art, the covalent triazine membrane prepared by the invention has high hydrocarbon solvent flux and high aromatic hydrocarbon-alkane selectivity, and has important significance on design and preparation of an aromatic hydrocarbon-alkane separation membrane and development of a membrane-based diesel dearomatization technology.

A process including converting, in one or more cross-flow filtration separation units, a slurry catalyst containing solid particles and a petroleum-based oil liquid carrier to a slurry catalyst comprising solid particles and a renewable-based liquid carrier. The slurry catalyst containing solid particles and the renewable-based liquid carrier includes less than about 5 wt. % of the petroleum-based oil liquid carrier.

A process including converting, in one or more cross-flow filtration separation units, a slurry catalyst containing solid particles and a petroleum-based oil liquid carrier to a slurry catalyst comprising solid particles and a renewable-based liquid carrier. The slurry catalyst containing solid particles and the renewable-based liquid carrier includes less than about 5 wt. % of the petroleum -based oil liquid carrier.