Tail gas absorption device in chlorinated environment-friendly plasticizer production

Abstract

The utility model discloses a tail gas absorption device in chlorinated environment-friendly plasticizer production. The tail gas absorption device comprises a first-stage main reaction tower, a second-stage auxiliary absorption tower, a variable-frequency pressure fan, a third-stage auxiliary absorption tower, a pressure controller, a tail gas absorption tank and a pressure sensor, the first-stage reaction main tower, the second-stage absorption auxiliary tower, the variable-frequency pressure fan, the third-stage absorption auxiliary tower and the tail gas absorption tank are respectively and sequentially connected in series through pipelines; the pressure sensor is arranged in the secondary absorption auxiliary tower; the pressure controller, the pressure sensor and the variable-frequency pressure fan are respectively connected through linkage control lines, and the pressure controller is connected with a computer, a control cabinet and a programmable logic controller (PLC) of a program control system through the linkage control lines, so that an automatic pressure control system is formed. The device is simple and compact in structure, safe, reliable and pollution-free in production and high in chlorine utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of production devices for plasticizers of organic chemical products, and particularly relates to a tail gas absorption device in the production of chlorinated environmental protection plasticizers. Background Art

[0002] The main component of chlorinated environmental protection plasticizer is chlorinated fatty acid methyl ester, which is synthesized by reacting fatty acid methyl ester with chlorine gas. In this reaction, chlorine atoms replace hydrogen atoms in fatty acid methyl ester to make fatty acid methyl ester become chlorinated fatty acid methyl ester. At present, the production of chlorinated environmental protection plasticizers still generally adopts batch production, that is, production kettle by kettle. This batch production is divided into primary main tower reaction and secondary sub-tower reaction absorption. The tail gas after secondary sub-tower reaction absorption is then absorbed into acid by a tail gas absorption tank. The existing defect is that since this tail gas is still rich in chlorine gas, it will surely affect the utilization rate of chlorine gas and production cost. And if a tertiary absorption sub-tower reaction is added to fully absorb and utilize the residual chlorine in the tail gas, the pressure in the primary main tower will double for each additional sub-tower, greatly reducing the production safety and reliability. Summary of the Invention

[0003] The purpose of the utility model is to provide a tail gas absorption device in the production of chlorinated environmental protection plasticizers, which has a simple and compact structure, reliable production safety, and high chlorine gas utilization rate.

[0004] To achieve the above purpose, the tail gas absorption device in the production of chlorinated environmental protection plasticizers of the utility model includes a primary reaction main tower 1, a secondary absorption sub-tower 2, a variable frequency pressure blower 3, a tertiary absorption sub-tower 4, a pressure controller 5, a tail gas absorption tank 6, and a pressure sensor 7; the primary reaction main tower 1, the secondary absorption sub-tower 2, the variable frequency pressure blower 3, the tertiary absorption sub-tower 4, and the tail gas absorption tank 6 are respectively connected in series through pipelines in sequence; the pressure sensor 7 is placed inside the secondary absorption sub-tower 2; the pressure controller 5, the pressure sensor 7, and the variable frequency pressure blower 3 are respectively connected by linkage control lines, and the pressure controller 5 is further connected to a computer, a control cabinet, and a program control system PLC through linkage control lines, thereby constituting a pressure automatic control system.

[0005] The above program control system PLC is developed by Longyan Tianhong Computer Technology Co., Ltd. The PLC brand is Siemens. The CPU and acquisition control module of the PLC system are general products of the Siemens S7-1200 series. The PLC software programming is written by Longyan Tianhong Computer Technology Co., Ltd. according to requirements; all software and hardware of computer programs such as computers and control cabinets can be purchased from the market and belong to the prior art.

[0006] The tail gas absorption device in the production of chlorinated environmental protection plasticizers of the utility model has the following technical features and beneficial effects:

[0007] 1. By adopting a pressure automatic control system, even when the tail gas absorbed by the third-stage secondary tower is increased, the pressures in the first-stage main tower and the second-stage secondary tower can still be reduced. While fully absorbing and utilizing chlorine gas in the tail gas to reduce production costs, the production safety is greatly improved.

[0008] 2. The whole device has a simple and compact structure, low manufacturing and maintenance costs, and is safe, reliable, and pollution-free in production. Brief Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the tail gas absorption device in the production of the chlorinated environmental protection plasticizer of the present utility model.

[0010] Reference numerals: the first-stage reaction main tower 1, the second-stage absorption secondary tower 2, the variable-frequency pressure blower 3, the third-stage absorption secondary tower 4, the pressure controller 5, the tail gas absorption tank 6, and the pressure sensor 7. Detailed Embodiments

[0011] The following further details the detailed embodiments of the tail gas absorption device in the production of the chlorinated environmental protection plasticizer of the present utility model with reference to the drawings.

[0012] Figure 1 As shown, the tail gas absorption device in the production of the chlorinated environmental protection plasticizer of the present utility model includes a first-stage reaction main tower 1, a second-stage absorption secondary tower 2, a variable-frequency pressure blower 3, a third-stage absorption secondary tower 4, a pressure controller 5, a tail gas absorption tank 6, and a pressure sensor 7; the first-stage reaction main tower 1, the second-stage absorption secondary tower 2, the variable-frequency pressure blower 3, the third-stage absorption secondary tower 4, and the tail gas absorption tank 6 are sequentially connected in series through pipelines; the pressure sensor 7 is placed in the second-stage absorption secondary tower 2; the pressure controller 5, the pressure sensor 7, and the variable-frequency pressure blower 3 are respectively connected by linkage control lines, and the pressure controller 5 is further connected to a computer, a control cabinet, and a programmable logic controller (PLC) of a program control system through linkage control lines, thus forming a pressure automatic control system.

[0013] The specific operation of adopting the tail gas absorption device in the production of the chlorinated environmental protection plasticizer of the present utility model is as follows:

[0014] Set the pressure controller 5 to a slightly negative pressure value on the programmable logic controller (PLC) of the program control system, start the variable-frequency pressure blower 3, so that a negative pressure is always maintained in the second-stage absorption secondary tower 2, and the negative pressure of the second-stage absorption secondary tower 2 can reduce the pressure in the first-stage reaction main tower 1; the variable-frequency pressure blower 3 pumps the tail gas into the third-stage absorption secondary tower 4, so that chlorine gas reacts in the third-stage absorption secondary tower 4 after reacting in the first-stage reaction main tower 1 and the second-stage absorption secondary tower, greatly improving the utilization rate of chlorine gas, and reducing production costs while improving production safety.

Claims

1. A tail gas absorption device for the production of chlorinated environmentally friendly plasticizers, comprising a primary reaction main tower (1), a secondary absorption sub-tower (2), a variable frequency pressure blower (3), a tertiary absorption sub-tower (4), a pressure controller (5), a tail gas absorption tank (6) and a pressure sensor (7); the primary reaction main tower (1), the secondary absorption sub-tower (2), the variable frequency pressure blower (3), the tertiary absorption sub-tower (4) and the tail gas absorption tank (6) are respectively connected in series through pipelines; the pressure sensor (7) is placed in the secondary absorption sub-tower (2); the pressure controller (5), the pressure sensor (7) and the variable frequency pressure blower (3) are respectively connected by linkage control lines, and the pressure controller (5) is further connected to a computer, a control cabinet and a program control system PLC through the linkage control line, thereby forming a pressure automatic control system.

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