# US 11,306,262 B2 · Pretreatment method and system for fraction oil for production of alkylbenzene > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,262 B2 - Document ID: US11306262B2 - Status: Granted - Kind: B2 - Application number: 17/044,196 - Filed: 2019-06-11 - Published: 2021-02-25 - Granted: 2022-04-19 - Earliest claimed: 2018-06-29 - Assignees: Inner Mongolia Yitai Coal-based New Materials Research Institute Co., Ltd. - Applicants: Inner Mongolia Yitai Coal-based New Materials Research Institute Co., Ltd. - Inventors: Zhen Qian; Jingwei Wu; Xiaolong Zhang; Jingquan Zhang; Juncheng Li; Qinge Jian - Web page: https://patentgrep.com/patent/US11306262B2 ## CPC - C10G 53/12: including at least one alkaline treatment step - B01D 11/04: of solutions which are liquid - B01D 11/0426: {Counter-current multistage extraction towers in a vertical or sloping position} - B01D 11/0488: {Flow sheets} - B01D 11/0492: {Applications, solvents used} - B01D 17/0214: {with removal of one of the phases} - C10G 19/02: with aqueous alkaline solutions - C10G 21/16: Oxygen-containing compounds - C10G 21/28: Recovery of used solvent - C10G 25/05: Removal of non-hydrocarbon compounds, e.g. sulfur compounds - C10G 29/205: {by reaction with hydrocarbons added to the hydrocarbon oil} - C10G 57/005: {with alkylation} - C10G 53/04: including at least one extraction step - C10G 53/08: including at least one sorption step - C10G 2300/1022: Fischer-Tropsch products - C10G 2300/202: Heteroatoms content, i.e. S, N, O, P - C10G 2400/22: Higher olefins - C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract Disclosed are a pretreatment method and system for a fraction oil for the production of alkylbenzene, the method comprising: adding a fraction oil, a weak base solution and an inorganic salt solution into a reactor, and leaving same to stand and layering same after the reaction is complete; adding water and an inorganic salt solution into an oil phase for washing with water; extracting same with a polar solvent having a high boiling point, and then adsorbing same with an adsorbent to separate oxygen-containing compounds in the neutral fraction oil; sending the extraction agent containing the oxygen-containing compounds to an extraction agent recovery unit; and then sending the neutral fraction oil to an alkylation reactor for a reaction. ## Claims ### Claim 1 A method for pretreatment of a fraction oil for the production of alkylbenzene, characterized in comprising the following steps: reacting a fraction oil, a base solution and an inorganic salt solution in a reactor, fully stirring, standing still for layering after the reaction is complete, and discharging a generated emulsion phase and a water phase, leaving an oil phase; adding water and an inorganic salt solution into the oil phase for washing with water to remove redundant base solution, standing still for layering, and discharging a generated emulsion phase and a water phase, leaving a neutral fraction oil; conveying the neutral fraction oil to an extraction unit, extracting oxygen-containing compounds in the neutral fraction oil by using a polar solvent, then conveying the neutral fraction oil to an adsorption unit, and conveying an extraction agent containing the oxygen-containing compounds to an extraction agent recovery unit; in the adsorption unit, using an adsorbent to adsorb and separate the oxygen-containing compounds in the neutral fraction oil, and then the neutral fraction oil is conveyed to an alkylation reactor for reaction. ### Claim 2 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein the base solution is selected from one or more of potassium carbonate, sodium carbonate, potassium bicarbonate and sodium bicarbonate. ### Claim 3 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein, the inorganic salt solution is selected from one or more of potassium chloride, sodium chloride and calcium chloride. ### Claim 4 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein the polar solvent is selected from one or both of N-methylpyrrolidone and ethylene glycol. ### Claim 5 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein, in the extraction step, the neutral fraction oil is fed in the middle of the extraction unit, and the polar solvent is fed in the upper part of the extraction unit. ### Claim 6 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein in the extraction step, a gas mixture discharged from the extraction unit is cooled and the neutral fraction oil therein is recovered. ### Claim 7 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein, in the step of extraction agent recovery, the recovered extraction agent is conveyed into the extraction unit for recycling. ### Claim 8 (depends on 1) The pretreatment method for a fraction oil according to claim 1, wherein, in the step of extraction agent recovery, a gas mixture discharged from the extraction agent recovery unit is cooled and the oxygen-containing compounds therein is recovered. ### Claim 9 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein, the adsorbent is selected from one or more of ZSM-5.3A, 4A, 5A, 10X, and 13X molecular sieves. ### Claim 10 (depends on 1) The method for pretreatment of a fraction oil according to claim 1, wherein, the neutral fraction oil is preheated before being conveyed to the adsorption unit. ### Claim 11 A system for pretreatment of a fraction oil for the production of alkylbenzene, characterized in comprising a neutralization reaction unit, an extraction unit, an extraction agent recovery unit, and an adsorption unit which are connected in sequence, wherein the neutralization reaction unit is set up with a fraction oil inlet, a water injection port, a base solution inlet, an inorganic salt solution inlet, a neutral fraction oil outlet, and an emulsion phase and water phase outlet; the upper part of the extraction unit is connected with an extraction agent conveying pipeline; the middle part of the extraction unit is connected with the neutral fraction oil outlet of the neutralization reaction unit: the bottom of the extraction unit is connected with an inlet of the extraction agent recovery unit; and the top of the extraction unit is connected with an inlet of the adsorption unit; the top of the extraction agent recovery unit is connected with oxygen-containing compounds discharge pipeline, and the bottom of the extraction agent recovery unit is connected with an extraction agent conveying pipeline; the top of the adsorption unit is connected with an alkylation reactor. ### Claim 12 (depends on 11) The system for pretreatment of a fraction oil according to claim 11, wherein a cooling unit is set up on the top of the extraction unit for cooling and recovering the fraction oil in a top discharged gas. ### Claim 13 (depends on 12) The system for pretreatment of a fraction oil according to claim 12, wherein the cooling unit is connected to the adsorption unit through an extraction reflux tank. ### Claim 14 (depends on 11) The system for pretreatment of a fraction oil according to claim 11, wherein a cooling unit is set up on the top of the extraction agent recovery unit for recovering the oxygen-containing compounds in a top discharged gas. ### Claim 15 (depends on 14) The system for pretreatment of a fraction oil according to claim 14, wherein the cooling unit is connected to the oxygen-containing compounds discharge pipeline through a reflux tank. ### Claim 16 (depends on 11) The system for pretreatment of a fraction oil according to claim 11, wherein a preheater is installed between the extraction unit and the adsorption unit. ### Claim 17 (depends on 11) The system for pretreatment of a fraction oil according to claim 11, wherein a condenser is installed between the adsorption unit and the alkylation reactor.