公开(公告)号：US3721620A

公开(公告)日：1973-03-20

申请号：US3721620D

申请日：1970-07-17

Applicant: SNAM PROGETTI

Inventor： PARET G ,  CINELLI E

IPC: B01D11/04 ,  C07C7/00 ,  C07C7/08 ,  C07C7/10 ,  C10G21/02

CPC classification number: C07C7/08 ,  B01D11/0488 ,  C07C7/005 ,  C07C7/10 ,  C07C15/00

Abstract: A MULTI-STAGE COUNTERCURRENT PROCESS FOR THE SOLVENT EXTRACTION OF AROMATIC HYDROCARBONS FOR A MIXED FEED STOCK IS DISCLOSED WHEREIN THE FEED IS CONTACTED WITH SOLVENT AND EXTRACTED IN A FIRST STAGE, EXTRACT FROM THE FIRST STAGE IS PURIFIED IN A SECOND STAGE BY COUNTERCURRENT CONTACT WITH AN OVERHEAD FRACTION FROM A THIRD STAGE WHEREIN THE SECOND STAGE EXTRACT IS DISTILLED, AND RECTIFICATION IS EFFECTED IN A FOURTH STAGE WHEREIN WATER IS REFLUXED AND A PART OF THE WATER, OBTAINED AS REFLUX FREE OF SOLVENT, IS VAPORIZED AND RECYCLED TO THE BOTTOM OF THIS RECTIFICATION STAGE TO RECOVER THE SENSIBLE HEAT OF LEAN SOLVENT.

D R A W I N G

公开(公告)号：US3816302A

公开(公告)日：1974-06-11

申请号：US21356771

申请日：1971-12-29

Applicant: SNAM PROGETTI

Inventor： PARET G

IPC: C07C7/08 ,  C07C7/10 ,  C07C15/02 ,  C10G7/08 ,  C10G21/12 ,  C10G21/20 ,  C10G21/06

CPC classification number: C10G21/20 ,  C07C7/08 ,  C07C7/10 ,  C10G7/08 ,  C10G21/12 ,  C07C15/00

Abstract: A process is disclosed whereby aromatic hydrocarbons such as benzene, toluene and xylene are separated with high selectivity from mixtures in which they are contained through extraction and/or extractive distillation with the aid of a solvent mixture including morpholine and another solvent such as an oxygen containing derivative of morpholine and water, e.g. morpholinewater, morpholine-N-formyl morpholine and morpholine-N-formyl morpholine-water, in three main steps: (1) concentration of nonaromatic hydrocarbons to produce a stream free from aromatics; (2) purification of aromatics dissolved in rich solvent; and (3) recovery of the aromatics from the rich solvent.

公开(公告)号：US3720605A

公开(公告)日：1973-03-13

申请号：US3720605D

申请日：1970-07-17

Applicant: SNAM PROGETTI

Inventor： PARET G ,  CINELLI E

IPC: B01D3/40 ,  B01D11/04 ,  C07C1/00 ,  C07C7/00 ,  C07C7/08 ,  C07C7/10 ,  C07C15/02 ,  C07C67/00 ,  C10G7/08 ,  C10G21/00 ,  C10G21/20 ,  C10G21/28

CPC classification number: C07C7/08 ,  B01D11/0488 ,  C07C7/005 ,  C07C7/10 ,  C07C15/00

Abstract: A multi-stage countercurrent process for the solvent extraction of aromatic hydrocarbons from a mixed feed stock is disclosed wherein the feed is contacted with a keto- or aldo-morpholine and extracted in a first stage, extract from the first stage is purified in a second stage by countercurrent contact with an overhead fraction from a third stage wherein the second stage extract is distilled, and rectification is effected in a fourth stage wherein water is refluxed and a part of the water, obtained as reflux free of solvent, is vaporized and recycled to the bottom of this rectification stage to recover the sensible heat of lean solvent.

Abstract translation: 公开了一种用于从混合原料中溶剂萃取芳族烃的多级逆流方法，其中进料与酮 - 或吗啉进行接触并在第一阶段提取，第一阶段的提取物在第二阶段中被纯化 通过与来自第三阶段的塔顶馏分进行逆流接触，其中第二阶段提取物被蒸馏，并且在第四阶段进行精馏，其中水被回流，并且一部分水作为无回流的溶剂被蒸发并再循环 到这个整流阶段的底部，以回收贫溶剂的显热。