The application patent number is CN03 139690.9.
Date of patent application: July 3, 2003
Production process for separating ethylbenzene and o-xylene from mixed xylene
Publication (Announcement)No. CN 1566045
Publication date (announcement) 2005+0.338+09
Category chemistry; metallurgy
Certification date
right of priority
Application (patent right) China Petrochemical Maoming Refining & Chemical Co., Ltd.
Address: No.5250112, Changqian West Road, Maoming, Guangdong.
Inventor (designer) Huang Kunrong; Huang Zhongqi; Lin Xunyu; Wan Liexiong; He Danhong; Li Xiaoming; Ouyang, Gangfeng; Yang
International application
International announcement
date of entry
Patent Agency Guangzhou Zhiyou Patent Agency Co., Ltd.
Agent Liu Xiaomin.
abstract
The invention provides a production process for separating o-xylene and ethylbenzene from mixed xylene, which comprises the following steps: adding an accelerant into mixed xylene raw materials, entering an o-xylene separation tower, separating o-xylene products at the bottom of the tower, wherein the vapor at the top of the tower contains the accelerant, ethylbenzene, p-xylene and m-xylene, and then entering an ethylbenzene separation tower filled with screen corrugated packing, and separating a mixture of p-xylene and m-xylene containing almost no ethylbenzene at the bottom of the tower; The overhead distillate enters the promoter recovery tower again, and ethylbenzene without promoter is separated from the bottom of the tower. The accelerant without ethylbenzene is distilled from the top of the tower and pumped back to the mixed xylene raw material for recycling. The production process has the advantages of high purity, high extraction rate, simple process flow, less dosage of drier and obvious separation effect.
Sovereignty terms
1. A production process for separating o-xylene and ethylbenzene from mixed xylene is characterized in that: xylene raw material (D) and catalyst (H) are added into a mixer (1), and the volume ratio of the catalyst is 1 ~ 10%, and they are evenly stirred and mutually dissolved at normal temperature; The mixed mixture enters the o-xylene separation tower (2) at the rate of 0. 1 ~ 25L/h, the bottom temperature is 140 ~ 160℃, the bottom pressure is ≤0.02Mpa, the o-xylene product (e) is separated from the bottom, and part of the o-xylene product (e) passes through. The overhead steam (a) enters the overhead reflux intermediate tank (4) after being cooled by the cooler (3), a part of which is pumped into the top of the o-xylene separation tower (2) by the pump (5) as reflux, and a part of which is used as distillate (a), and the overhead reflux ratio is 2-50; The distillate (a) enters the ethylbenzene separation tower (7) at a flow rate of 0. 1 ~ 15L/h, and the bottom temperature is controlled at 140 ~ 160℃, and the bottom pressure is ≤0.02Mpa, so that p-xylene and m-xylene (f) can be obtained. The vapor (b) distilled at the top of the tower is cooled by the cooler (8) to become liquid, and then enters the overhead reflux intermediate tank (9). Some of the vapor (b) is pumped back to the top of the ethylbenzene separation tower (7) by the pump (10), and some of it is used as the overhead distillate (b), with the overhead reflux ratio of18 ~170. The overhead distillate (b) enters the catalyst recovery tower (12), the bottom temperature is controlled at 130 ~ 180℃, the bottom pressure is ≤0.0 1Mpa, ethylbenzene product (g) is separated from the bottom, and part of ethylbenzene product (g) is separated. The overhead steam (C) is cooled by the cooler (180) and part of it is pumped back to the top of the catalyst recovery tower (12) by the pump (16), and part of it is used as the overhead distillate (C), and the reflux ratio at the top of the tower is 5-6544.
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