Ethylene oxide ring-opening catalytic polymerization system

Abstract

The invention discloses an ethylene oxide ring-opening catalytic polymerization system which comprises a catalyst preparation tank, an ethylene oxide gasification heating tank, a reaction kettle, a drying device and an automatic packaging machine, the catalyst preparation tank and the ethylene oxide gasification heating tank are used for being connected with the reaction kettle, and the discharging end of the reaction kettle is connected with the drying device. The drying equipment is used for being connected with an automatic packaging machine; a plurality of structures such as the catalyst preparation tank, the ethylene oxide gasification heating tank, the reaction kettle, the drying equipment and the automatic packaging machine are combined, the catalyst metering pump is arranged between the catalyst preparation tank and the reaction kettle, and a catalyst is quantitatively conveyed into the reaction kettle through the catalyst metering pump; quantitative feeding of the catalyst is achieved through the catalyst metering pump, implosion after one-time feeding of the catalyst can be avoided, uncontrollable technological parameters can be avoided, and meanwhile the situation that due to uneven dispersion of the catalyst, product particles are too large, and part of the catalyst cannot completely intervene in a polymerization reaction is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of ethylene oxide ring-opening catalytic polymerization, in particular to an ethylene oxide ring-opening catalytic polymerization system. Background Art

[0002] In the prior art, the ethylene oxide ring-opening catalytic polymerization system has the following problems when in use:

[0003] 1. The temperature in the reactor is uncontrollable, which affects the reaction effect inside the reactor.

[0004] 2. The amount of catalyst cannot be controlled. The explosion after the catalyst is added once makes the process parameters uncontrollable. It will also cause uneven dispersion of the catalyst, resulting in excessively large product particles and some catalysts failing to fully participate in the polymerization reaction.

[0005] Therefore, an ethylene oxide ring-opening catalytic polymerization system has become an urgent problem to be solved by the entire society. Summary of the invention

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: an ethylene oxide ring-opening catalytic polymerization system, comprising a catalyst configuration tank, an ethylene oxide gasification heating tank, a reactor, a drying device and an automatic packaging machine, wherein the catalyst configuration tank and the ethylene oxide gasification heating tank are used to be connected to the reactor, the discharge end of the reactor is connected to the drying device, and the drying device is used to be connected to the automatic packaging machine;

[0007] The catalyst configuration tank is connected to a molecular sieve and a solvent feed pump, and the solvent is quantitatively delivered to the reactor through the solvent feed pump;

[0008] A catalyst metering pump is provided between the catalyst configuration tank and the reactor, and the catalyst is quantitatively delivered into the reactor through the catalyst metering pump;

[0009] A pressure regulating valve is installed on the top of the reactor, and a liquid level interlock and a pressure interlock are provided on the ethylene oxide gasification heating tank.

[0010] Furthermore, a solid catalyst feeding port is provided at the top of the catalyst configuration tank, a flow meter and a cut-off valve are installed on the catalyst configuration tank, a pressure relief valve is installed on the ethylene oxide gasification heating tank, and the pressure transmitter is interlocked with the pressure relief valve.

[0011] Furthermore, the ethylene oxide gasification heating tank is connected with a jacket, and hot water is used for heating to gasify the ethylene oxide.

[0012] Furthermore, the reactor adopts over-temperature and over-pressure interlocking, and a discharge valve is arranged at the bottom of the reactor, and the reactor enters the drying equipment through the discharge valve.

[0013] The advantages of the invention compared with the prior art are:

[0014] The present invention combines a catalyst configuration tank, an ethylene oxide gasification and heating tank, a reactor, a drying device, an automatic packaging machine and other structures. A catalyst metering pump is provided between the catalyst configuration tank and the reactor. The catalyst is quantitatively delivered to the reactor by the catalyst metering pump. The quantitative feeding of the catalyst is achieved by the catalyst metering pump, which can avoid the explosion of the catalyst after the catalyst is added once, making the process parameters uncontrollable, and also avoid uneven dispersion of the catalyst, resulting in excessively large product particles and failure of some catalysts to fully participate in the polymerization reaction.

[0015] The present invention adopts an over-temperature and over-pressure interlocking for the reactor, so that the reactor temperature in the reactor can be controlled within a controllable range, so that the internal temperature of the reactor meets the reaction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic structural diagram of an ethylene oxide ring-opening catalytic polymerization system. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0019] The present invention is described in detail with reference to the accompanying drawings.

[0020] The present invention provides an ethylene oxide ring-opening catalytic polymerization system in a specific implementation, comprising a catalyst configuration tank V-01, an ethylene oxide gasification heating tank V-02, a reactor R-01, a drying device R-02 and an automatic packaging machine C-01, wherein the catalyst configuration tank V-01 and the ethylene oxide gasification heating tank V-02 are used to be connected to the reactor R-01, the discharge end of the reactor R-01 is connected to the drying device R-02, and the drying device R-02 is used to be connected to the automatic packaging machine C-01;

[0021] The catalyst preparation tank V-01 is connected to a molecular sieve ST-01 and a solvent pump, and the solvent is quantitatively transported to the reactor R-01 through the solvent pump;

[0022] A catalyst metering pump P-01 is provided between the catalyst configuration tank V-01 and the reactor R-01, and the catalyst is quantitatively transported into the reactor R-01 through the catalyst metering pump P-01;

[0023] A pressure regulating valve PV-01 is installed on the top of the reactor R-01, and a liquid level interlock and a pressure interlock are provided on the ethylene oxide gasification heating tank V-02.

[0024] Example:

[0025] When the present invention is in use, when the triggering condition is reached, the ethylene oxide feed valve HV-04 is closed, the vent valve HV-05 is opened, and the refrigerant water valve HV-06 is opened, and a rapid response is achieved, so that the kettle temperature and kettle pressure are quickly restored to a controllable range;

[0026] After the catalyst is evaluated by a small test device and the activity and product molecular weight range are determined, the given frequency of the catalyst metering pump P-01 is determined according to the change trend and rate of the thermometer pressure in the reactor, and the catalyst is continuously added to avoid the explosion of the catalyst after the catalyst is added once, which makes the process parameters uncontrollable. At the same time, it also avoids uneven dispersion of the catalyst, which leads to excessively large product particles and the failure of some catalysts to fully participate in the polymerization reaction;

[0027] After the ethylene oxide gasification heating tank V-02 is heated and gasified, it enters the reactor at a constant pressure (0.1MPa), and the pressure regulating valve PV-01 is adjusted through the reactor pressure PIS-04 (the reactor pressure is controlled at 0.04MPa) to continuously feed;

[0028] The ethylene oxide gasification heating tank V-02 is provided with a liquid level interlock. When the set liquid level is reached, the HV-02 feed valve is closed. At the same time, an overpressure protection device is provided on the tank. A pressure transmitter PT-01 is installed on the ethylene oxide gasification heating tank V-02. A pressure relief valve HV-03 is installed on the ethylene oxide gasification heating tank V-02. The pressure transmitter PT-01 is interlocked with the pressure relief valve HV-03. When the tank pressure exceeds the set value, HV-03 is opened, and the gas phase ethylene oxide returns to the storage tank to ensure that the tank pressure is within the safe process parameters.

[0029] The kettle temperature is controlled by the refrigerant return water regulating valve TV-02 / 03. TV-02 / 03 adopts split-range control. In the early stage of the reaction, due to the slow temperature rise rate and small valve opening, a small-diameter valve is used to control the refrigerant water flow. In the middle and late stages of the reaction, the reaction is intense, and a large-diameter valve is used to control the refrigerant water flow, so that the temperature of the reactor is controlled stably during the entire reaction cycle. At the same time, considering the accident state, the two regulating valves are opened at the same time, and the cut-off valve HV-06 is opened to achieve the purpose of rapid temperature reduction;

[0030] After the reaction is complete and matured for 4 hours, the reactor R-01 is discharged into the drying equipment R-02 through the discharge valve to completely separate the product and the solvent. The solvent is recovered into the solvent tank and is set aside after distillation. The product enters the automatic packaging machine C-01 to start the packaging process.

[0031] The specific process of the present invention is as follows:

[0032] 1) Catalyst preparation process: firstly, the solvent is added into the catalyst preparation tank V-01 through the flow interlock valve, and then the canned solid catalyst is put into the tank for standby use;

[0033] 2) Ethylene oxide is transported to ethylene oxide gasification heating tank V-02 through a feed pump, and the tank top pressure and liquid phase temperature are controlled in cascade by tank top pressure and liquid phase temperature;

[0034] 3) A quantitative solvent is delivered to the reactor R-01 through the solvent delivery pump, and a quantitative catalyst is delivered to the reactor through the catalyst metering pump P-01. The P-01 regulating valve is adjusted according to the pressure in the reactor to control the reactor top pressure and feed amount of the reactor R-01, and the molecular weight is controlled by online sampling and the catalyst supply amount.

[0035] Among them, the catalyst configuration tank V-01 can realize the quantitative cutting off of the solvent, the ethylene oxide gasification heating tank V-02 can maintain the pressure, and the tank top pressure and the temperature inside the tank can be controlled in cascade.

[0036] As a further elaboration of the present invention, a solid catalyst feeding port is provided at the top of the catalyst configuration tank V-01, a pressure transmitter PT-01 is installed on the catalyst configuration tank V-01, a pressure relief valve HV-03 is installed on the ethylene oxide gasification heating tank V-02, and the pressure transmitter PT-01 is interlocked with the pressure relief valve HV-03.

[0037] As a further elaboration of the present invention, the ethylene oxide gasification heating tank V-02 is connected with a jacket and uses hot water heating to gasify the ethylene oxide.

[0038] As a further elaboration of the present invention, the reactor R-01 adopts over-temperature and over-pressure interlocking, and a discharge valve is provided at the bottom of the reactor R-01, and the reactor R-01 enters the drying equipment R-02 through the discharge valve.

[0039] The SIS system uses temperature TICS-03 / 04 / 05 and kettle pressure PIS-03 to adopt OR logic interlock, among which the temperature adopts three-choose-two, which can improve the safety of the SIS system. Specifically, the reaction R-01 over-temperature and over-pressure interlock (temperature three-choose-two TE-03 / 04 / 05 and kettle PT-03 OR logic interlock. After triggering, HV-04 closes the feed, HV-05 opens the vent, and HV-06 opens the refrigerant return water).

[0040] As a further elaboration of the present invention, the kettle temperature of the reactor R-01 is controlled by the refrigerant return water regulating valve TV-02 and the refrigerant return water regulating valve TV-03, and the refrigerant return water regulating valve TV-02 and the refrigerant return water regulating valve TV-03 adopt split-range control.

[0041] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An ethylene oxide ring-opening catalytic polymerization system, characterized in that: It comprises a catalyst configuration tank (V-01), an ethylene oxide gasification heating tank (V-02), a reactor (R-01), a drying device (R-02) and an automatic packaging machine (C-01), wherein the catalyst configuration tank (V-01) and the ethylene oxide gasification heating tank (V-02) are used to be connected to the reactor (R-01), the discharge end of the reactor (R-01) is connected to the drying device (R-02), and the drying device (R-02) is used to be connected to the automatic packaging machine (C-01); The catalyst preparation tank (V-01) is connected to a molecular sieve (ST-01) and a solvent pump, and the solvent is quantitatively delivered to the reactor (R-01) through the solvent pump; A catalyst metering pump (P-01) is provided between the catalyst configuration tank (V-01) and the reactor (R-01), and the catalyst is quantitatively transported into the reactor (R-01) through the catalyst metering pump (P-01); A pressure regulating valve (PV-01) is installed on the top of the reactor (R-01), and a liquid level interlock is provided on the ethylene oxide gasification heating tank (V-02).

2. The ethylene oxide ring-opening catalytic polymerization system according to claim 1, characterized in that: A solid catalyst feeding port is provided at the top of the catalyst configuration tank (V-01), a flow meter and a shut-off valve are installed on the catalyst configuration tank (V-01), a pressure relief valve (HV-03) is installed on the ethylene oxide gasification heating tank (V-02), and the pressure transmitter (PT-01) is interlocked with the pressure relief valve (HV-03).

3. The ethylene oxide ring-opening catalytic polymerization system according to claim 1, characterized in that: The ethylene oxide gasification heating tank (V-02) is connected with a jacket and uses hot water heating to gasify the ethylene oxide.

4. The ethylene oxide ring-opening catalytic polymerization system according to claim 1, characterized in that: The reactor (R-01) adopts over-temperature and over-pressure interlocking, and a discharge valve is arranged at the bottom of the reactor (R-01), and the reactor (R-01) enters the drying equipment (R-02) through the discharge valve.

5. The ethylene oxide ring-opening catalytic polymerization system according to claim 4, characterized in that: The kettle temperature of the reactor (R-01) is controlled by the refrigerant return water regulating valve (TV-02) and the refrigerant return water regulating valve (TV-03), and the refrigerant return water regulating valve (TV-02) and the refrigerant return water regulating valve (TV-03) adopt split-range control.

Images