CN201301291Y

CN201301291Y - Benzene recovery unit

Info

Publication number: CN201301291Y
Application number: CNU200820220197XU
Authority: CN
Inventors: 佟庆杰; 邹健
Original assignee: Liaoyang Guanghua Chemical Co Ltd
Current assignee: Liaoyang Guanghua Chemical Co Ltd
Priority date: 2008-12-03
Filing date: 2008-12-03
Publication date: 2009-09-02
Anticipated expiration: 2018-12-03

Abstract

A benzene recovery unit relates to a device for recovering benzene in mixture gas of benzene steam and nitrogen during producing sulfolane, which is mainly designed for solving the problem of low coefficient of recovery of benzene exhausted during producing sulfolane. The benzene recovery unit comprises a benzene cooler, wherein a heat exchange tube is arranged in the benzene cooler, and is connected with an upper tube plate and a lower tube plate, a coolant inlet and a coolant outlet arranged on a shell layer are connected with a refrigerating machine, a water outlet arranged on the bottom of the benzene cooler is connected with a circulating pump through a pipeline, a spray tower is connected with the upper portion of the benzene cooler, packing is filled in the spray tower, a benzene steam and nitrogen mixed gas outlet is arranged on the lower portion of the spray tower, a spray head is arranged on the inner upper portion of the spray tower, and is connected with the circulating pump through a pipeline, an incondensable gas outlet is arranged on the top of the spray tower, a liquid benzene outlet is arranged on the benzene cooler to connect with a benzene storage tank through a pipeline, and a water exhaust port and a benzene outlet arranged on the lower portion of the benzene storage tank are respectively connected with the circulating pump and a production unit through pipelines. The benzene recovery unit has the advantage of over 95% benzene coefficient of recovery.

Description

The benzene retrieving arrangement

Technical field:

The utility model relates to the device of the benzene in a kind of gas mixture that reclaims the benzene vapor of discharging when producing tetramethylene sulfone and nitrogen.

Background technology:

The benzene that reclaims at present in the gas mixture of the benzene vapor of discharging when producing tetramethylene sulfone and nitrogen mainly adopts pipe bundle condenser to reclaim, employing be air cooling, the rate of recovery of benzene is low, generally can reclaim about 40%.

Summary of the invention:

Technical problem to be solved in the utility model provides a kind of high benzene retrieving arrangement of the rate of recovery of benzene.

Above-mentioned purpose is achieved in that it comprises the benzene water cooler, in the benzene water cooler heat transfer tube is arranged, heat transfer tube and last, lower tubesheet links to each other, shell has cooling fluid to advance, outlet links to each other with refrigerator, benzene water cooler bottom has water outlet to be connected with recycle pump by pipeline, the top of benzene water cooler is connected with spray column, filler is arranged in the spray column, benzene vapor and nitrogen mixture import are arranged at the spray column bottom, the spray column internal upper part has spray header, spray header is connected with recycle pump by pipeline, row's non-condensable gas mouth is arranged at the top of spray column, also have the liquid benzene outlet to be connected with the benzene storage tank by pipeline on the benzene water cooler, water port is arranged at benzene storage tank bottom, and outlet links to each other with recycle pump and production equipment through pipeline respectively with benzene.

The utility model has the advantages that: because benzene vapor contacts cooling with spray water with nitrogen mixture in spray column, so good cooling effect, through test, the rate of recovery of benzene can reach 95%.

Description of drawings:

Accompanying drawing is a structural representation of the present utility model.

Embodiment:

With reference to accompanying drawing, it comprises benzene water cooler 3, heat transfer tube 2 is arranged in the benzene water cooler, heat transfer tube 2 is with last,

lower tubesheet

14,15 link to each other, shell has cooling fluid to advance, outlet links to each other with refrigerator, benzene water cooler 3 bottoms have water outlet 10 to be connected with recycle pump 1 by pipeline, the top of benzene water cooler is connected with spray column 4, filler 5 is arranged in the spray column, benzene vapor and nitrogen mixture import 8 are arranged at the spray column bottom, the spray column internal upper part has spray header 7, spray header 7 is connected with recycle pump 1 by pipeline, row's non-condensable gas mouth 6 is arranged at the top of spray column, also has liquid benzene outlet 9 to be connected with benzene storage tank 13 by pipeline on the benzene water cooler, and benzene storage tank bottom has water port 11 and benzene to export 12 to link to each other with recycle pump and production equipment through pipeline respectively.

Principle of work: benzene vapor and nitrogen mixture enter spray column from the inlet mouth of spray column bottom, washed by the spray header spray cooling through filler, benzene vapor is liquefied, flow in the benzene water cooler, because benzene density is less than water and water insoluble, water is discharged from water outlet in benzene water cooler bottom, continue circulation cleaning through recycle pump to spray header, nitrogen is discharged from row's non-condensable gas mouth, when reaching a certain amount of, the benzene liquid in the benzene water cooler enters the benzene storage tank from the liquid benzene outlet, the a spot of water of benzene tank bottom is got back to spray header from water port through pipeline and recycle pump, flows back to the device of producing tetramethylene sulfone from the benzene outlet when benzene in the benzene storage tank reaches a certain amount of.

Claims

1, the benzene retrieving arrangement, comprise benzene water cooler (3), it is characterized in that heat transfer tube (2) is arranged in the benzene water cooler, heat transfer tube (2) is with last, lower tubesheet (14,15) link to each other, shell has cooling fluid to advance, outlet links to each other with refrigerator, benzene water cooler (3) bottom has water outlet (10) to be connected with recycle pump (1) by pipeline, the top of benzene water cooler is connected with spray column (4), filler (5) is arranged in the spray column, benzene vapor and nitrogen mixture import (8) are arranged at the spray column bottom, the spray column internal upper part has spray header (7), spray header (7) is connected with recycle pump (1) by pipeline, row's non-condensable gas mouth (6) is arranged at the top of spray column, also has liquid benzene outlet (9) to be connected with benzene storage tank (13) by pipeline on the benzene water cooler, and benzene storage tank bottom has water port (11) to link to each other with recycle pump and production equipment through pipeline respectively with benzene outlet (12).