C4 comprehensive utilization system

Abstract

The utility model discloses a C4 comprehensive utilization system which comprises a propylene removal tower, the upper end of the propylene removal tower is provided with a polymer-grade propylene product discharge end, the lower end of the propylene removal tower is provided with a C4 discharge end, the C4 comprehensive utilization system further comprises a decarburization tower, and the C4 discharge end is connected to the feed end of the decarburization tower through a first regulating valve. The discharge end of the decarbonization tower is connected to the feed end of a return tank through a first electromagnetic valve, the discharge end of the return tank is connected to the discharge end of a first regulating valve through a first booster pump and a second regulating valve which are connected in series, and meanwhile, the discharge end of the first regulating valve is also connected with a return pipe and a pressure relief pipe. The method has the advantage of better comprehensive benefits.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical processing equipment, and in particular to a C4 comprehensive utilization system. Background Art

[0002] Among the olefin conversion technologies, the OCT process of Lummus has been industrialized. This process uses C4 and ethylene as raw materials to produce polymerization-grade propylene products and the remaining C4 products. The olefin conversion unit mainly includes a C4 feed processing system, a two-stage selective hydrogenation unit, an OCT reactor feed processing and reaction unit, and a product distillation and regeneration unit. In this process, polymerization-grade propylene is produced from the top of the propylene removal tower for use in the downstream polypropylene unit; and the remaining C4 products produced from the bottom of the tower are generally sold externally. Summary of the invention

[0003] The purpose of the present invention is to provide a C4 comprehensive utilization system, which has the characteristics of better comprehensive benefits.

[0004] The technical solution adopted by the present invention is: a C4 comprehensive utilization system, including a depropylene tower, the upper end of the depropylene tower has a polymerization-grade propylene product discharge end, and the lower end has a C4 discharge end. The C4 comprehensive utilization system also includes a decarbonization tower, the C4 discharge end is connected to the feed end of the decarbonization tower through a first regulating valve, the discharge end of the decarbonization tower is connected to the feed end of a reflux tank through a first solenoid valve, the discharge end of the reflux tank is connected to the discharge end of the first regulating valve through a first booster pump and a second regulating valve connected in series, and at the same time, the discharge end of the first regulating valve is also connected to a return pipe and a pressure relief pipe.

[0005] The C4 comprehensive utilization system also includes an ethylene feedstock tank, and the discharge end of the decarbonization tower is connected to the ethylene feedstock tank through a third regulating valve, a second boosting pump, and a second solenoid valve connected in series.

[0006] The C4 comprehensive utilization system also includes an upstream butane C5 product pipeline, and the discharge end of the second solenoid valve is connected to the upstream butane C product pipeline through a fourth regulating valve.

[0007] Compared with the prior art, the present invention has the advantages of better comprehensive benefits. The C4 comprehensive utilization system of the present invention separates C4 and C5 from the remaining C4 products on the basis of the original extracted polymerization-grade propylene products, and can sell them separately to improve production efficiency. The separated C4 can also be returned to the upstream for refining as needed to increase the production of dienes. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0009] Figure 1It is a connection diagram of an embodiment of the present invention.

[0010] In the figure:

[0011] 10. propylene removal tower, 11. polymerization-grade propylene product discharge end, 12. C4 discharge end, 121. first regulating valve, 122. return pipe, 123. pressure relief pipe;

[0012] 20. decarbonization tower, 21. third regulating valve, 22. second booster pump, 23. second solenoid valve;

[0013] 30. Upstream butane C5 product pipeline, 31. Fourth regulating valve;

[0014] 40. A first solenoid valve;

[0015] 50. reflux tank, 51. first booster pump, 52. second regulating valve;

[0016] 60. Ethylene raw material tank. Implementation

[0017] For example, see Figure 1 As shown: the C4 comprehensive utilization system comprises a propylene removal tower 10. The propylene removal tower 10 has a polymerization-grade propylene product discharge end 11 at the upper end and a C4 discharge end 12 at the lower end.

[0018] Further speaking:

[0019] The C4 comprehensive utilization system also includes a decarbonization tower 20. The C4 discharge end 12 is connected to the feed end of the decarbonization tower 20 through a first regulating valve 121. The discharge end of the decarbonization tower 20 is connected to the feed end of a reflux tank 50 through a first solenoid valve 40. The discharge end of the reflux tank 50 is connected to the discharge end of the first regulating valve 121 through a first booster pump 51 and a second regulating valve 52 connected in series. At the same time, the discharge end of the first regulating valve 121 is also connected to a return pipe 122 and a pressure relief pipe 123, and the return pipe 122 is generally in a normally closed state. That is, part of the C4 product of the depropylene tower is further decarbonized, and gas-liquid exchange can be performed on the tower plate to form a purified mixed C4 product on the top of the tower. It enters the reflux tank through the circulating water condenser and is sent to the original remaining C4 pipeline through pressurization. It can be sent to the tank area as a product for sale, or it can be sent to the front-end integrated equipment through the C4 recycling line. The products such as C5 in the bottom of the tower can be further comprehensively utilized after pressurization, cooling and other treatments.

[0020] Optimized:

[0021] The C4 comprehensive utilization system also includes an ethylene raw material tank 60, which is generally an original equipment of the manufacturer. The discharge end of the decarbonization tower 20 is connected to the ethylene raw material tank 60 through the third regulating valve 21, the second booster pump 22, and the second solenoid valve 23 connected in series. That is, it can be further comprehensively utilized and enter the ethylene processing system.

[0022] The C4 comprehensive utilization system also includes an upstream butane C5 product pipeline 30, which can also be an original equipment of the manufacturer. The discharge end of the second solenoid valve 23 is connected to the upstream butane C product pipeline 30 through a fourth regulating valve 31. That is, it can be further transported to the upstream for comprehensive utilization again.

[0023] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A C4 comprehensive utilization system, comprising a depropylene tower (10), wherein the depropylene tower (10) has a polymerization-grade propylene product discharge end (11) at the upper end and a C4 discharge end (12) at the lower end, and is characterized in that: The C4 comprehensive utilization system further comprises a decarbonization tower (20), wherein the C4 discharge end (12) is connected to the feed end of the decarbonization tower (20) via a first regulating valve (121), the discharge end of the decarbonization tower (20) is connected to the feed end of a reflux tank (50) via a first solenoid valve (40), the discharge end of the reflux tank (50) is connected to the discharge end of the first regulating valve (121) via a first booster pump (51) and a second regulating valve (52) connected in series, and at the same time, the discharge end of the first regulating valve (121) is also connected to a return pipe (122) and a pressure relief pipe (123).

2. The C4 comprehensive utilization system according to claim 1, characterized in that: The C4 comprehensive utilization system further comprises an ethylene raw material tank (60), and the discharge end of the decarbonization tower (20) is connected to the ethylene raw material tank (60) via a third regulating valve (21), a second boosting pump (22), and a second solenoid valve (23) connected in series.

3. The C4 comprehensive utilization system according to claim 2, characterized in that: The C4 comprehensive utilization system further comprises an upstream butane C5 product pipeline (30), and the discharge end of the second solenoid valve (23) is connected to the upstream butane C product pipeline (30) via a fourth regulating valve (31).

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