CN-122015016-A - Fluoroolefin compression conveying system and method

CN122015016ACN 122015016 ACN122015016 ACN 122015016ACN-122015016-A

Abstract

The invention belongs to the technical field of fluorine-containing olefin conveying, and particularly relates to a fluorine-containing olefin compression conveying system and method. The fluorine-containing olefin compression conveying system comprises a low-pressure buffer tank, a pure water circulating tank, a high-pressure circulating pump and an ejector pump, wherein the low-pressure buffer tank is used for storing fluorine-containing olefin, the pure water circulating tank is used for storing deoxidized high-purity water, the high-pressure circulating pump is used for extracting deoxidized high-purity water in the pure water circulating tank, the liquid inlet end of the ejector pump is communicated with the high-pressure circulating pump, the air inlet end of the ejector pump is communicated with the low-pressure buffer tank, the ejector pump is communicated with the pure water circulating tank, the high-pressure circulating pump is used for pressurizing deoxidized high-purity water in the pure water circulating tank and inputting the fluorine-containing olefin in the low-pressure buffer tank into the ejector pump, the fluorine-containing olefin is mixed with the deoxidized high-purity water and then ejected into the pure water circulating tank, and the fluorine-containing olefin is separated out and enters a gas phase space at the upper part of the pure water circulating tank for pressurization. The fluorine-containing olefin compression conveying system can adopt deoxidized high-purity water as a circulating medium to carry out pressurization under the action of the jet pump, so that the explosion risk can be reduced, a compressor is omitted, the occupied area of equipment is reduced, the self-polymerization risk is also reduced, and different monomers can be uniformly mixed by the jet pump.

Inventors

ZHANG JINGANG
ZHOU LV
SUN DONGPING
ZHANG XIAOYUAN
ZHOU TINGTING
ZHENG DONGYUE

Assignees

南京理工大学

Dates

Publication Date: 20260512
Application Date: 20260311

Claims (10)

1. A compression and conveying system for fluorine-containing olefin, characterized by comprising the following steps: a low pressure buffer tank (1) for storing the fluoroolefins; a pure water circulation tank (2) for storing deoxidized high-purity water; A high-pressure circulation pump (3) for extracting deoxidized high-purity water in the pure water circulation tank (2), and A jet pump (4) with a liquid inlet end communicated with the high-pressure circulating pump (3), an air inlet end communicated with the low-pressure buffer tank (1) and a jet end communicated with the pure water circulating tank (2), wherein The high-pressure circulating pump (3) inputs deoxidized high-purity water in the pure water circulating tank (2) into the jet pump (4) in a pressurizing mode, so that fluorine-containing olefin in the low-pressure buffer tank (1) is sucked into the jet pump (4), the fluorine-containing olefin is mixed with the deoxidized high-purity water and then is sprayed into the pure water circulating tank (2), and the fluorine-containing olefin is separated out after entering the pure water circulating tank (2) and enters a gas phase space at the upper portion of the pure water circulating tank (2) to be pressurized to 3.0-3.5 MPa.
2. The fluoroolefin compression delivery system as claimed in claim 1 wherein, The upper space of the pure water circulating tank (2) is used for storing fluorine-containing olefin, and the lower space is used for storing deoxidized high-purity water; The high-pressure circulating pump (3) is communicated with the lower part of the pure water circulating tank (2).
3. The fluoroolefin compression delivery system as defined in claim 1 further comprising: A high-pressure buffer tank (5) which is communicated with the gas phase space at the upper part of the pure water circulating tank (2) and is used for storing the pressurized fluorine-containing olefin; The regulating valve (51) is arranged on a pipeline between the pure water circulating tank (2) and the high-pressure buffer tank (5); And a dryer (6) which is communicated with the high-pressure buffer tank (5) and is used for drying the fluorine-containing olefin.
4. The fluoroolefin compression delivery system as claimed in claim 1 wherein, The high-pressure circulating pump (3) pumps deoxidized high-purity water in the pure water circulating tank (2), and the deoxidized high-purity water enters the jet pump (4) after being cooled by the cooler (7); And the cooler (7) cools the deoxidized high-purity water to 5-10 ℃.
5. The fluoroolefin compression delivery system as claimed in claim 1 wherein, The jet pump (4) comprises: the lower end of the air suction chamber (41) is provided with a liquid collecting nozzle (411), and the side wall of the air suction chamber is provided with an air inlet (412) communicated with the low-pressure buffer tank (1); A jet pipe (42) with an upper end provided with a water inlet (421) communicating with the high-pressure circulation pump (3), a lower end extending into the suction chamber (41) and provided with a liquid inlet nozzle (422) facing the liquid collecting nozzle (411), and The water outlet pipe (43) comprises a straight pipe section (431) and an expansion section (432), wherein the upper end of the straight pipe section (431) is connected with the liquid collecting nozzle (411), and the lower end of the expansion section (432) is connected with the pure water circulating tank (2).
6. The fluoroolefin compression transport system as defined in claim 5 wherein, The jet pipe (42) is internally provided with a liquid inlet guide vane (423) for jetting deoxidized high-purity water downwards in a cyclone mode.
7. The fluoroolefin compression delivery system as claimed in claim 1 wherein, The fluorine-containing olefin comprises one or more of tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride and chlorotrifluoroethylene.
8. A fluoroolefin compression conveying method using the fluoroolefin compression conveying system as claimed in any one of claims 1 to 7, comprising: Controlling the pressure in the low-pressure buffer tank (1) to be-0.05-0.1 MPa; Cooling deoxidized high-purity water extracted by the high-pressure circulating pump (3) to 5-10 ℃ and discharging the deoxidized high-purity water into the jet pump (4); controlling the pressure of the high-pressure circulating pump (3) to control the pressure of fluoroolefin in the gas phase space at the upper part of the pure water circulating tank (2) to be 3.0-3.5 MPa; and controlling the regulating valve (51) to regulate the pressure in the high-pressure buffer tank (5) to be 2.5-3.0 MPa.
9. The method for compressed transportation of fluorine-containing olefin according to claim 8, The fluorine-containing olefin is one fluorine-containing olefin monomer or a mixture of two fluorine-containing olefin monomers.
10. The method for compressed transportation of fluorine-containing olefin according to claim 8, And (3) drying the fluorine-containing olefin in the high-pressure buffer tank (5) and then inputting the dried fluorine-containing olefin into the reaction kettle.

Description

Fluoroolefin compression conveying system and method Technical Field The invention belongs to the technical field of fluorine-containing olefin conveying, and particularly relates to a fluorine-containing olefin compression conveying system and method. Background Fluorine-containing olefins such as tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride, and chlorotrifluoroethylene are required for use in similar processes such as PTFE polymerization, polytetrafluoroethylene propylene polymerization, soluble PFA polymerization, perfluorosulfonic acid resin polymerization, pentafluoroethane preparation, perfluoroiodoalkane telogen, tetrafluoropropanol reaction, fluororubber polymerization, and F40 polymerization. Such reactors often need to be operated at relatively high pressures, and therefore, the fluoroolefins need to be pressurized to a sufficient pressure to successfully enter the reaction vessel. There are two common pressurization methods, one is to use a compressor to carry out the pressurized and then transported fluorine-containing olefin. Two fluoroolefins for synthetic fluororubber are compressed as an example, and the flow is shown in FIG. 1. Problems with this process include 1, poor safety, compressor leakage, air ingress, etc., and increased risk of explosion. 2. The occupied area is large, the equipment investment is large, the compressor needs to have enough maintenance space, and meanwhile, the compressor needs to be matched with a cooler, a buffer tank and the like, so that the occupied area of the equipment is large. Meanwhile, the cost of the compressor is high. 3. The compressor has the advantages of poor stability, more traditional parts of the compressor, membrane and the like belonging to vulnerable parts, therefore, the compressor needs to be maintained regularly, and the maintenance frequency is high. 4. Monomers such as TFE are susceptible to self-polymerization, i.e., because of the compressor compressing pure fluoroolefins, these fluoroolefins are active in nature and subject to polymerization, i.e., they can clog pipes and increase the risk of explosion. The other way is to utilize the saturated vapor pressure of fluorine-containing olefin to be directly pressed into the reaction kettle. Taking the polymerization of pure TFE monomer to produce PTFE as an example, the flow is shown in fig. 2. The problems of the technology include 1, poor safety, that is, high-purity fluorine-containing olefin exists in the whole system, monomer is easy to self-polymerize, and oxygen channeling and explosion are easy to happen. 2. The equipment occupies large space, and because TFE monomers are extremely easy to self-gather in the monomer storage tank and the gasification tank, the risk is guaranteed to be high, and therefore, the equipment is required to be independently arranged in the explosion-proof room, more building area is occupied, and the civil engineering cost is high. 3. The control system is complex, and the accident frequently occurs due to easy runaway, namely, the gasification tank needs to be heated by steam or hot water, and the saturated steam is higher and higher along with the temperature rise of TFE monomer. If the hot water regulating valve is out of control, the pressure in the gasification tank is easily increased rapidly, and the risks of explosion and self-aggregation are increased. Disclosure of Invention The invention aims to provide a fluoroolefin compression conveying system and method, which take deoxidized high-pressure pure water as a circulating medium, and boost the pressure of fluoroolefin in a spray suction and pressurization mode so as to realize compression conveying. A first aspect of the present application provides a fluoroolefin compression transport system comprising: a low pressure buffer tank for storing the fluoroolefin; a pure water circulation tank for storing deoxidized high purity water; A high-pressure circulation pump for pumping deoxidized high-purity water in the pure water circulation tank, and A jet pump, the liquid inlet end of which is communicated with the high-pressure circulating pump, the air inlet end of which is communicated with the low-pressure buffer tank, and the jet end of which is communicated with the pure water circulating tank, wherein The high-pressure circulating pump is used for pressurizing and inputting deoxidized high-purity water in the pure water circulating tank into the jet pump so as to suck fluorine-containing olefin in the low-pressure buffer tank into the jet pump, the fluorine-containing olefin is mixed with deoxidized high-purity water and then is sprayed into the pure water circulating tank, and the fluorine-containing olefin is separated out after entering the pure water circulating tank and enters a gas phase space at the upper part of the pure water circulating tank for pressurizing. In one embodiment of the application, the upper space of the pure water circulating tank is used for storing flu