13results about "Absorption purification/separation" patented technology

The application discloses a biomass fermentation process for preparing green methanol, which comprises the following steps: providing a biomass raw material, and fermenting to obtain biogas; obtaining rich-methane gas after crude purification of the biogas; obtaining qualified rich-methane gas after super-precision detoxification of the rich-methane gas; adding medium-pressure steam into the qualified rich-methane gas, and performing a methane steam reforming reaction to obtain a mixed gas; performing PSA treatment on the mixed gas to obtain a resolved gas and a raw material gas; and feeding the resolved gas into a normal-temperature catalytic heat exchange system, and taking the raw material gas as one of raw materials for methanol synthesis to prepare refined methanol. The application realizes full-chain coupling and efficient utilization, combines biomass fermentation, biogas purification and methane steam reforming, and adopts a CO2 circulation technology. The application realizes full-process energy integration: the waste heat in the fermentation process, the waste heat of the PSA resolved gas and the waste water of rectification are utilized to drive the methane steam reforming reaction, the system energy consumption is reduced, and the economic efficiency and sustainability of the system are further improved.

A hydrocarbon isomerization system for an iC4 feed stream that provides for removal of C3s from an isomerization reactor feed stream by the addition of a depropanizer column to remove C3s from the reactor effluent stream after it has passed through a stabilizer column. This configuration prevents a buildup of C3s in the system and provides significant savings by reducing the size of the chloride treaters that are used to remove chlorides from off gas, increasing chlorides recovered to the hydrocarbon feed stream for use in combination with the isomerization catalyst. Significant utility savings are provided as well as a reduction in the amount of perchloroethane (PERC) and adsorbent that are required.

Provided is a method for upgrading a bio-based material, the method including the steps of pre-treating bio-renewable oil(s) and / or fat(s) to provide a bio-based fresh feed material, hydrotreating the bio-based fresh feed material, followed by separation, to provide a bio-propane composition.

The present invention aims to provide a separation apparatus that can relatively improve the purity of ethylene and propylene while relatively reducing the amount of coolant used, as well as a method for separating ethylene and propylene. [Solution] The separation apparatus according to the present invention is a separation apparatus for separating ethylene and propylene from a gas composition containing ethylene, propylene, water and an organic compound, and has a gas-liquid contact region in which the gas composition and a water-absorbing coolant are supplied from opposite directions and brought into countercurrent contact, and has a first separation unit that separates the gas composition into a gas component (A) containing ethylene and propylene and a liquid component (B) containing water, an organic compound and a water-absorbing coolant by countercurrent contact, and has a first return path that returns at least a portion of the liquid component (B) to an intermediate flow region between the upstream end and the downstream end in the flow direction of the water-absorbing coolant in the gas-liquid contact region, and a first cooling unit is interposed in the first return path to cool the returned liquid component (B).

A salt ion membrane may be paired with an absorption device to provide advantaged separation processes comprising: introducing a first aqueous salt stream and a mixed feed stream comprising at least one olefin and at least one paraffin to a salt ion membrane under conditions effective to form at least two phases; obtaining an olefin-rich permeate stream and an olefin-lean retentate stream from the salt ion membrane, in which the olefin-rich permeate stream and / or the olefin-lean retentate stream further comprises a salt ion membrane aqueous salt phase; introducing at least a portion of the olefin-lean retentate stream and a second aqueous salt stream to an absorption device under conditions effective to promote olefin extraction; obtaining an olefin-rich aqueous salt stream from the absorption device; and providing at least a portion of the olefin-rich aqueous salt stream as at least a portion of the first aqueous salt stream.

The application relates to an olefin catalytic cracking reaction product separation method and system, and belongs to the technical field of chemical production. The system comprises a reactor, a separation unit, an impurity removal unit, a light removal column, an ethane removal column, a propane removal column and a rectification unit, the separation unit is used for separating an olefin catalytic cracking reaction product to obtain a first carbon component and a carbon four component; the impurity removal unit removes impurities in the first carbon component to obtain a second carbon component; the light removal column uses the carbon four component as an absorbent to absorb and separate carbon two components and carbon three components in the second carbon component to obtain a third carbon component comprising the carbon two components, the carbon three components and the carbon four components; then the ethane removal column and the propane removal column are used to sequentially separate the carbon two components and the carbon three components in the third carbon component and perform rectification to prepare polymerization-grade ethylene and polymerization-grade propylene. The application has the advantages of simple process, strong operability, low energy consumption and the like, and can meet the long-period operation of the olefin catalytic cracking reaction product separation method.

The present invention provides a method for recovering a conjugated diene-based monomer, comprising the steps of: supplying a feed stream containing a conjugated diene-based monomer to a condensation section to condense it, thereby obtaining a stream containing the condensed conjugated diene-based monomer and a stream containing uncondensed conjugated diene-based monomer; recovering the conjugated diene-based monomer from the stream containing the condensed conjugated diene-based monomer, supplying the stream containing the uncondensed conjugated diene-based monomer to a first absorption tower to bring it into contact with an absorbent, thereby obtaining an absorption solution in which the conjugated diene-based monomer is absorbed into the absorbent; supplying the absorption solution to a stripping column to separate the absorption solution into the absorbent and the conjugated diene-based monomer; circulating a bottom discharge stream from the stripping column containing the separated absorbent to the first absorption column; and circulating an top discharge stream from the stripping column containing the separated conjugated diene-based monomer to the condensation section.

The present application relates to a kind of recycling method of acetylene and ammonia in acetylene reaction tail gas, the acetylene reaction tail gas is discharged with liquid ammonia as solvent and contains acetylene and ammonia in the tail gas of acetylene reaction;The recycling method of the acetylene reaction tail gas includes the following steps: (1) the acetylene reaction tail gas is passed into acetylene absorption system, and the acetylene in the acetylene reaction tail gas is absorbed by acetylene absorbent;(2) the tail gas after being treated in step (1) is passed into ammonia absorption system, and the ammonia in the processed tail gas is absorbed by ammonia absorbent, to obtain the absorption material containing ammonia;(3) the absorption material containing ammonia obtained in step (2) is desorbed in ammonia desorption system to recover ammonia.The recycling method in the application can effectively recover acetylene and ammonia in acetylene reaction tail gas, and make acetylene and ammonia have high recovery rate, solve the safety environmental protection problem existing in tail gas direct discharge or incineration treatment, and also can reduce production cost.

This invention discloses a pretreatment process for dry gas from ethylbenzene production. The steps are as follows: the dry gas from ethylbenzene production sequentially enters a dry gas separator and coalescer, a dry gas water washing tower, a water-washed dry gas cooler, and a water-washed dry gas separator to remove organic amines and / or ammonia carried in the dry gas. The dry gas water washing tower is arranged from bottom to top as a first water washing section, a second water washing section, a third water washing section, ..., N water washing sections, where N≥2. A collection tank is set between two adjacent water washing sections. The bottom plate of the collection tank is equipped with a riser hole and a riser pipe to connect the two adjacent water washing sections. Each water washing section is arranged from bottom to top as a structured packing section and a water washing water distributor. The dry gas water washing adopts a multi-stage water washing process. Each stage of water washing uses a water washing circulation pump to circulate the water washing water. A water washing water filter is installed on the water washing water circulation pipeline of each stage. The water washing water adopts a method of partial circulation, continuous discharge, and continuous water replenishment. Using this invention, the amount of alkaline substances carried in the dry gas of ethylbenzene production feedstock can be effectively removed.

The present invention relates to an improved process and system for purifying a gas, preferably an energy gas, containing aromatic compounds and isolating a fraction of aromatic compounds from said gas. In the process according to the invention, the gas is contacted with a washing liquid in step (a), at a temperature of 15 –250 °C, to obtain a purified gas, which is depleted in aromatic compounds, and a spent washing liquid wherein the aromatic compounds are dissolved. The spent washing liquid is stripped in step (b) with a stripping gas comprising at least 0 vol.% steam, to obtain a stripped washing liquid which is advantageously reused in step (a) and a loaded stripping gas comprising the aromatic compounds. The aromatic compounds are separated from the loaded stripping gas in step (c) by condensation of the steam and / or the aromatic compounds comprised in the loaded stripping gas to obtain an immiscible composition and isolating the aromatic compounds therefrom. The cleared stripping gas which is advantageously reused in step (b).

The application provides a non-water absorbent, a preparation method thereof and a CO2 capture method for dry associated gas in an oil and gas field. The raw material composition of the non-water absorbent comprises 1-40 wt% of an imidazole substance, 0.5-15% of metal organic framework compound nanoparticles and 50-98.5% of an organic solvent; the imidazole substance comprises at least one of imidazole, 1-methyl imidazole and 2-methyl imidazole; the metal organic framework compound nanoparticles comprise at least one of ZIF-8, ZIF-67 and CALF-20; and the organic solvent comprises at least one of ethylene glycol, 1,3-dimethyl-2-imidazolidinone, propylene carbonate, N,N-dimethylacetamide, polyethylene glycol dimethyl ether, isohexadecane, N-methyl pyrrolidone, 1,3-dimethylpropylene urea, dimethyl sulfoxide and sulfolane. The non-water absorbent provided by the application can realize effective separation of CO2 and C 2+ gas hydrocarbons.

The application relates to the field of monomer synthetic chemistry and discloses a continuous preparation process of benzocyclobutene primary product, which comprises a continuous vacuum cracking section and a refrigeration impurity removal section, a temperature rising HCl removal and extraction section, a washing, drying and extractant recovery section. The process solves the defects of low yield of the benzocyclobutene primary product synthesized by the vacuum cracking method, intermittent reaction, the fact that HCl components in the cracking product cannot be effectively recovered, the fact that the product is easy to emulsify in the washing process of the cracking product, and the fact that the alkali solution is large in quantity. The benzocyclobutene primary product prepared by the application can be used as a raw material for preparing electronic-grade benzocyclobutene, and is favorable for solving the current problems in chips, semiconductors and advanced composite materials.