CN-122006418-A - Separation tower and carbon disulfide production system comprising same

Abstract

The invention discloses a separation tower and a carbon disulfide production system comprising the same, which comprises a separation tower for primarily cooling and washing sulfur-containing gas-liquid mixed process gas from a reactor, and further comprises an internal circulation unit, a heat recovery unit and a control unit, wherein the separation tower comprises a tower shell, a first-stage washing cooling section and a second-stage fine washing section are arranged in the tower shell from bottom to top, a liquid collector is arranged below the second-stage fine washing section, the liquid collector is provided with a gas-liquid split structure for enabling gas to pass through and guiding liquid and is communicated with a carbon disulfide discharge port arranged on the tower shell, and the invention belongs to the technical field of chemical separation.

Inventors

• ZHANG ZHAOHUI
• KANG TIANLI
• SHI WENZHONG

Assignees

• 上海百金化工集团股份有限公司

Dates

Publication Date

20260512

Application Date

20260408

Claims (12)

1. 1. A separation tower, which comprises a separation tower for carrying out preliminary cooling and washing on sulfur-containing gas-liquid mixed process gas from a reactor; the heat recovery device is characterized by further comprising an internal circulation unit, a heat recovery unit and a control unit; the separation tower comprises a tower shell, a first-stage washing cooling section and a second-stage fine washing section are arranged in the tower shell from bottom to top, a liquid collector is arranged below the second-stage fine washing section, and the liquid collector is provided with a gas-liquid split structure which enables gas to pass through and guide liquid and is communicated with a carbon disulfide discharge hole formed in the tower shell; The internal circulation unit comprises a circulation pipeline and is used for sending part of carbon disulfide liquid output from the carbon disulfide discharge port back to the second-stage fine washing section as internal circulation liquid; The heat recovery unit comprises a heat exchanger which is arranged on a supply pipeline of the external fresh carbon disulfide washing liquid in series and is configured to perform heat exchange with the external fresh washing liquid by utilizing gas discharged from the top of the tower shell so as to preheat the external washing liquid and cool the discharged gas; The control unit comprises a controller, an online analyzer for detecting the sulfur content in the exhaust gas of the separation tower in real time, and a first adjusting mechanism for adjusting the liquid flow in the circulating pipeline, wherein the controller is connected with the online analyzer and the first adjusting mechanism and is configured to control the first adjusting mechanism according to the detection signal of the online analyzer so as to adjust the state of the washing liquid sent to the second-stage fine washing section.
2. 2. The separation tower according to claim 1, wherein the first-stage washing and cooling section comprises a first packing layer and a first liquid distributor which is positioned above the first packing layer and communicated with a first carbon disulfide feeding port, the second-stage fine washing section comprises a second packing layer and a second liquid distributor which is positioned above the second packing layer and communicated with a second carbon disulfide feeding port, and a liquid outlet end of the circulating pipeline is connected to the second carbon disulfide feeding port.
3. 3. A separator according to claim 2, wherein the first and second liquid distributors are integrated with the first and second pressure rings, respectively, for compressing the corresponding packing layers.
4. 4. A separation tower according to claim 3, wherein the first and second pressing rings each comprise a pressing plate provided with a transverse groove, the top ends of the grooves are communicated with a communicating pipe arranged on the pressing plate through communicating holes, and the bottom is provided with an outlet.
5. 5. The separation tower according to claim 4, wherein the liquid collector comprises a collecting hood, a collecting hood arranged below the collecting hood, and a plurality of ventilation pipes penetrating through the collecting hood, wherein the top ends of the ventilation pipes are provided with conical hoods, the pipe walls of the ventilation pipes are provided with vertical through grooves, and the collecting hood is connected with the carbon disulfide discharge port.
6. 6. The separator of claim 5, wherein a second grid for supporting the second packing layer is disposed in the separator, the second grid includes a support plate with a through-hole and a perforated base plate, and the cone cover is disposed between the perforated base plate and the support plate.
7. 7. A separator according to claim 1, wherein the first regulating means comprises a circulation pump and/or a flow regulating valve provided on the circulation line.
8. 8. The separator according to claim 7, wherein the control unit further comprises a second adjusting mechanism for adjusting a mixing ratio of the preheated external washing liquid and the internal circulation liquid, and the second adjusting mechanism is connected to the controller.
9. 9. The separator of claim 8, wherein the control unit further comprises a differential pressure sensor for monitoring a differential pressure of the packing layer of the second-stage finishing section, and the controller is further configured to control the first adjusting mechanism and/or the second adjusting mechanism according to a signal of the differential pressure sensor to reduce a total load of the washing liquid when the differential pressure is abnormally increased.
10. 10. The separator of claim 1, wherein the control unit further comprises a temperature sensor for monitoring the temperature of the cold and hot side streams of the heat exchanger, and wherein the controller is further configured to adjust the working conditions of the first adjusting mechanism and/or the heat exchanger to reduce the comprehensive energy consumption of the system under the premise of ensuring that the sulfur content of the exhaust gas meets the standard and the pressure difference is normal.
11. 11. A separation tower according to claim 1, wherein the bottom of the tower shell of the separation tower is provided with a discharge port for discharging settled sulfur, and the lower side wall is provided with a mixed feed liquid inlet for inputting process gas.
12. 12. A carbon disulphide production system comprising a separation column, comprising a separation column according to any one of claims 1 to 11.

Description

Separation tower and carbon disulfide production system comprising same Technical Field The invention relates to the technical field of chemical separation, in particular to a separation tower and a carbon disulfide production system containing the separation tower. Background In the industrial production of carbon disulphide, a gas phase reaction method of natural gas and sulfur is commonly adopted. The reaction is carried out at high temperature to produce a high temperature mixture comprising the target product carbon disulphide vapour, unreacted raw methane and sulphur (both liquid and gaseous), and by-product hydrogen sulphide, which mixture must undergo a series of preliminary separation steps to remove the vast majority of sulphur and reduce the temperature before it can enter the subsequent refining section. The traditional process usually adopts a plurality of pressure vessels (such as a vapor-liquid separator, a sulfur trap, a separation tower and a condenser) with single functions to complete the task through complex pipeline and valve series combination. This combination, while achieving the basic split cooling function, has a number of inherent drawbacks. Firstly, the multi-equipment scattered arrangement results in lengthy process flow and huge occupied area, thus not only increasing capital investment, but also introducing a large amount of potential leakage risks due to numerous connection points, and seriously threatening the operation safety of the device when treating high-temperature and inflammable carbon disulfide media. And secondly, the synergy and the operation elasticity among the independent devices are poor, the adaptability to the fluctuation of the upstream reaction working condition is insufficient, the separation effect is unstable, and the quality of the final product is influenced. Again, traditional sulphur trap (like silk screen formula) entrapment efficiency is limited, and shell and tube condenser extremely easily takes place to block up because of sulphur condenses in long-term operation again, leads to maintaining to overhaul frequently, influences continuity and the stability of production. In addition, the heat removed from the high-temperature process gas is generally directly removed only through a cooling medium, so that a great amount of low-grade heat energy is wasted, and the energy cannot be effectively recycled; therefore, the existing demand is not satisfied, and for this reason we propose a separation tower and a carbon disulfide production system containing the separation tower. Disclosure of Invention Therefore, the present invention provides a separation tower and a carbon disulfide production system comprising the same, so as to solve the above problems in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: according to a first aspect of the invention, a separation tower and a carbon disulfide production system comprising the separation tower comprise a separation tower for carrying out preliminary cooling and washing on sulfur-containing gas-liquid mixed process gas from a reactor; the device also comprises an internal circulation unit, a heat recovery unit and a control unit; the separation tower comprises a tower shell, a first-stage washing cooling section and a second-stage fine washing section are arranged in the tower shell from bottom to top, a liquid collector is arranged below the second-stage fine washing section, and the liquid collector is provided with a gas-liquid split structure which enables gas to pass through and guide liquid and is communicated with a carbon disulfide discharge hole formed in the tower shell; The internal circulation unit comprises a circulation pipeline and is used for sending part of carbon disulfide liquid output from the carbon disulfide discharge port back to the second-stage fine washing section as internal circulation liquid; The heat recovery unit comprises a heat exchanger which is arranged on a supply pipeline of external fresh carbon disulfide washing liquid in series and is configured to perform heat exchange with the external fresh washing liquid by utilizing gas discharged from the top of the tower shell so as to preheat the external washing liquid and cool the discharged gas; The control unit comprises a controller, an online analyzer for detecting the sulfur content in the exhaust gas of the separation tower in real time, and a first adjusting mechanism for adjusting the liquid flow in the circulating pipeline, wherein the controller is connected with the online analyzer and the first adjusting mechanism and is configured to control the first adjusting mechanism according to the detection signal of the online analyzer so as to adjust the state of the washing liquid sent to the second-stage fine washing section; The control unit comprises a controller, an online analyzer for detecting the sulfur content in the exhaust gas of the separa