METHOD FOR PRODUCING XYLENE

• Main Authors: OSHIO ATSUYASU, KAWADA YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 22.10.2015
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CRACKING HYDROCARBON OILS; FUELS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LUBRICANTS; METALLURGY; MINERAL WAXES; ORGANIC CHEMISTRY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

PROBLEM TO BE SOLVED: To provide a method for simply producing xylene with high yield even though a catalytically cracked gasoline, which has a low aromatic hydrocarbon content ratio and contains an unsaturated hydrocarbon, a sulfur content, and a nitrogen content, is used as a starting material for a conversion reaction such as a disproportionation reaction or a transalkylation reaction.SOLUTION: A method for producing xylene comprises: (a) a fractional distillation step for conducting fractional distillation to obtain a distillate fraction having a boiling point range of 145 to 205°C by subjecting a fluid catalytically cracked gasoline to distillation; (b) a hydrogenation step for adjusting the sulfur content to 0 to 6 ppm by mass and the nitrogen content to 0 to 6 ppm by mass by subjecting the distillate fraction obtained in the fractional distillation step (a) and having the boiling point range of 145 to 205°C to a hydrodesulfurization/denitrification reaction; and (c) a disproportionation/transalkylation step for subjecting a product oil obtained in the hydrogenation step (b) and containing an aromatic hydrocarbon to a disproportionation reaction or a transalkylation reaction. 【課題】芳香族炭化水素の含有割合が低く、不飽和炭化水素や硫黄分、窒素分等を含有する接触分解ガソリンを不均化反応またはトランスアルキル化反応等の転化反応の原料に用いつつも、簡便かつ高い得率でキシレンを製造する方法を提供する。【解決手段】キシレンを製造する方法であって、（ａ）流動接触分解ガソリンを蒸留処理して沸点範囲が１４５〜２０５℃の留分を分留する分留工程と、（ｂ）前記（ａ）分留工程で得られた沸点範囲が１４５〜２０５℃の留分を水素化脱硫／脱窒反応させることにより、硫黄含有量を０〜６質量ｐｐｍ、窒素含有量を０〜６質量ｐｐｍに調整する水素化処理工程と、（ｃ）上記（ｂ）水素化処理工程で得られた芳香族炭化水素を含む生成油に、不均化反応またはトランスアルキル化反応を施す不均化／トランスアルキル化工程とを含むことを特徴とするキシレンの製造方法である。【選択図】なし