Negative-pressure crude benzene distillation method and device

• Main Authors: WANG SONGLIN, XING LIANQI, YU HAILU, ZHANG SULI
• Format: Patent
• Language: Chinese; English
• Published: 25.06.2024
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention relates to a negative-pressure crude benzene distillation method and device. The negative-pressure crude benzene distillation method comprises the following steps: 1) condensation heat exchange self-reflux of a first heat exchange section of a rectifying section of a debenzolization tower; 2) performing condensation heat exchange and self-reflux on a second heat exchange section of the rectifying section of the debenzolization tower; 3) condensing, cooling and vacuumizing desorption steam at the top of the debenzolization tower; and 4) oil-water separation. Part of waste heat in the crude benzene distillation process can be recycled, and the energy utilization rate is increased; a crude benzene forced reflux process is reduced, and the equipment investment is reduced. 本发明涉及一种负压粗苯蒸馏方法及装置，包括如下步骤：1)脱苯塔精馏段第一换热段冷凝换热自回流；2)脱苯塔精馏段第二换热段冷凝换热自回流；3)脱苯塔顶部解吸汽冷凝冷却与抽真空；4)油水分离。本发明可以回收粗苯蒸馏过程部分余热，提高了能源利用率；减少粗苯强制回流工艺，降低了设备投资。