CN-121988268-A - Integrated reaction kettle for preparing epoxy derivatives

Abstract

The invention discloses an integrated reaction kettle for preparing an epoxy derivative, which is used for solving the problems of discontinuous flow, uneven mixing and low reaction efficiency in the existing epoxy derivative preparation process. The reaction kettle comprises an integrated kettle body, wherein the integrated kettle body is a gas-liquid phase reaction chamber and a reactant collecting chamber which are directly communicated from top to bottom, the reactant collecting chamber is connected with a liquid phase distributor positioned at the top of the gas-liquid phase reaction chamber through a circulation loop and is used for circulating and dispersing liquid phase reaction materials, and a reactant feeding unit is used for introducing and atomizing liquid alkylene oxide monomers into the gas-liquid phase reaction chamber. The reactor is characterized in that an atomization area of a reactant feeding unit and a dispersion area of a liquid phase distributor are overlapped in a gas-liquid phase reaction chamber through structural design. The integrated design omits complex connection among split devices, eliminates the risk of valve leakage, greatly strengthens gas-liquid mass transfer through forced mixing, and remarkably improves the reaction efficiency and the space-time yield of the devices.

Inventors

• Ying Licheng
• LI JUNBO
• CHENG NINGNING
• TAN LIPENG
• LIU BINJIE
• GENG CHEN
• GU XINCHUN
• LIU XINAN
• HOU JIANLONG
• PEI JIN
• MENG YAN
• GUO QIAN
• NIE TAO
• LI QUAN
• WANG WENJUAN
• GUO YUAN
• LI YAJING
• CHAI XINGANG

Assignees

• 中国化学赛鼎宁波工程有限公司

Dates

Publication Date

20260508

Application Date

20251222

Claims (10)

1. 1. An integrated reaction kettle for preparing an epoxy derivative, which is characterized by comprising: The integrated kettle body is sequentially provided with a gas-liquid phase reaction chamber and a reactant collecting chamber which are directly communicated from top to bottom; the circulating loop is provided with a circulating liquid outlet arranged on the reactant collecting chamber and a circulating liquid inlet arranged on the top of the gas-liquid phase reaction chamber; the liquid phase distributor is arranged in the gas-liquid phase reaction cavity, connected with the circulating liquid inlet and used for receiving and dispersing liquid phase reaction materials from the circulating loop; a reactant feeding unit for introducing liquid alkylene oxide monomer into the gas-liquid phase reaction chamber and atomizing; Wherein the atomizing area of the reactant feed unit overlaps the dispersing area of the liquid phase distributor within the gas-liquid phase reaction chamber.
2. 2. The integrated reaction kettle for preparing the epoxy derivative according to claim 1, wherein the circulating loop comprises a primary circulating loop and a secondary circulating loop which are arranged in parallel, the primary circulating loop and the secondary circulating loop are respectively provided with an independent circulating liquid outlet and a circulating liquid inlet, the circulating liquid outlets of the primary circulating loop and the secondary circulating loop are arranged on the reactant collecting chamber at intervals along the height direction, the position of the circulating liquid outlet of the primary circulating loop is lower than that of the circulating liquid outlet of the secondary circulating loop, a primary circulating pump and a primary circulating heat exchanger are connected in series between the circulating liquid outlet and the circulating liquid inlet of the primary circulating loop, and a secondary circulating pump and a secondary circulating heat exchanger are connected in series between the circulating liquid outlet and the circulating liquid inlet of the secondary circulating loop.
3. 3. An integrated reaction kettle for preparing an epoxy derivative according to claim 2 wherein said liquid phase distributor comprises: The primary distributor is connected with a circulating liquid inlet of the primary circulating loop, comprises a central inner extending pipe and extends to the upper part of the reactant collecting chamber, a plurality of layers of first atomization units are axially arranged on the pipe wall of the central inner extending pipe at intervals, each layer of first atomization units comprises a plurality of first atomizers which are uniformly distributed along the circumferential direction, and the spraying direction of each first atomization unit faces the inner wall of the gas-liquid phase reaction chamber; The secondary distributor is connected with a circulating fluid inlet of the secondary circulating loop and comprises a plurality of peripheral inner extending pipes which encircle the central inner extending pipe, a plurality of layers of second atomization units are axially arranged on the pipe wall of each peripheral inner extending pipe at intervals, and each layer of second atomization units comprises a second atomizer, and the spraying direction of the second atomizer faces the central inner extending pipe.
4. 4. An integrated reaction kettle for preparing epoxy derivatives as claimed in claim 3, wherein said central inner extension tube and said peripheral inner extension tube are reducing tubes having a through flow cross section gradually decreasing along the flow direction of the liquid phase reaction material.
5. 5. An integrated reaction kettle for preparing epoxy derivatives as claimed in claim 3 or 4, wherein said reactant feeding unit comprises: The feed inlets are arranged on the side wall of the gas-liquid phase reaction chamber and are provided with multiple layers at intervals along the height direction; Each feed atomizer is connected with one feed port and extends into the gas-liquid phase reaction chamber, and the spraying direction of the feed atomizers faces the central axis of the gas-liquid phase reaction chamber; wherein, a plurality of the feeding atomizers in the same layer are uniformly distributed along the circumference of the gas-liquid phase reaction chamber.
6. 6. An integrated reaction kettle for preparing an epoxy derivative according to any one of claims 1 to 4 further comprising a preheating system for preheating said integrated kettle body, said preheating system comprising a plurality of outer half-tubes, said integrated kettle body outer wall sections being surrounded by a plurality of said outer half-tubes, each of said outer half-tubes having a heat transfer medium inlet and a condensate outlet.
7. 7. An integrated reaction kettle for preparing epoxy derivatives as claimed in any one of claims 1 to 4, wherein a chain initiator feed port is provided on the side wall of the reactant collecting chamber.
8. 8. An integrated reaction kettle for preparing an epoxy derivative according to claim 5 wherein said feed atomizer and said second atomizer are present in a staggered arrangement across the cross section of said gas-liquid phase reaction chamber.
9. 9. An integrated reaction kettle for preparing an epoxy derivative according to claim 2, wherein a temperature sensor, a pressure sensor and a liquid level sensor are arranged on the reactant collecting chamber and are respectively used for monitoring the temperature, the pressure and the liquid level of liquid phase reaction materials, and the start-up of the secondary circulation loop is configured to respond to the liquid level monitored by the liquid level sensor to reach preset values.
10. 10. An integrated reaction kettle for preparing epoxy derivatives according to any of claims 1 to 4, characterized in that the gas-liquid phase reaction chamber and the reactant collecting chamber are connected by a detachable flange.

Description

Integrated reaction kettle for preparing epoxy derivatives Technical Field The invention relates to the technical field of chemical equipment, in particular to an integrated reaction kettle for preparing epoxy derivatives efficiently, high-quality and safely. Background In the process of preparing polyether and other products by ring-opening addition polymerization of epoxy derivatives, especially Ethylene Oxide (EO)/Propylene Oxide (PO) as monomers in the presence of chain initiator, a split system comprising a gas-liquid phase reactor and a reaction collector is generally adopted, and the typical operation flow is that the reaction is firstly carried out in the reaction collector, when the liquid level in the reaction collector reaches a preset 'large circulation starting liquid level', the system opens a communication valve between the two, and liquid phase materials in the reaction collector are pumped into the gas-liquid phase reactor, so that the latter is formally put into operation. The split system has the following significant defects: 1. the system has loose structure, discontinuous flow and low safety, and because two independent devices are needed, the system is forced to rely on a communication valve to realize the connection of the two devices and the material circulation, so that the system has loose structure, large occupied area and high investment cost. The starting and switching of production depend on liquid level judgment, the flow is discontinuous, the steps are complex, and the efficiency is low. Meanwhile, the communication valve is used as a potential leakage point, and the safety risk of unexpected leakage of the epoxy compound exists. 2. The gas-liquid mixing is uneven, the reaction efficiency is low, the internal part of the gas-liquid phase reactor is simple in structure, the liquid phase reactant (such as chain initiator) is usually fed only through simple spraying, the gas-liquid contact area is limited, and the reaction rate is controlled by mass transfer. This not only results in low production efficiency, but also may result in too broad molecular weight distribution of the product, affecting quality. 3. The equipment is not fully utilized, and the space is wasted, namely, the gas-liquid phase reactor is in an idle state and cannot be used as an effective reaction space before the large circulation is started. The split design causes waste of equipment space, essentially reduces the gas-liquid contact area in the unit volume of equipment, and reduces the overall reaction efficiency. Therefore, a novel reaction device capable of realizing process continuity, mixing and high efficiency and space integration is urgently needed to meet the requirements of high-efficiency, high-quality and safe preparation of epoxy derivatives. Disclosure of Invention The invention aims to solve the technical problems of discontinuous flow, uneven mixing and low reaction efficiency in the existing epoxy derivative preparation process by providing an integrated reaction kettle for preparing the epoxy derivative and through an integrated design and an innovative internal structure. The invention solves the technical problems by adopting the technical scheme that the integrated reaction kettle for preparing the epoxy derivative comprises the following components: The integrated kettle body is sequentially provided with a gas-liquid phase reaction chamber and a reactant collecting chamber which are directly communicated from top to bottom; the circulating loop is provided with a circulating liquid outlet arranged on the reactant collecting chamber and a circulating liquid inlet arranged on the top of the gas-liquid phase reaction chamber; the liquid phase distributor is arranged in the gas-liquid phase reaction cavity, connected with the circulating liquid inlet and used for receiving and dispersing liquid phase reaction materials from the circulating loop; a reactant feeding unit for introducing liquid alkylene oxide monomer into the gas-liquid phase reaction chamber and atomizing; Wherein the atomizing area of the reactant feed unit overlaps the dispersing area of the liquid phase distributor within the gas-liquid phase reaction chamber. The circulating loop comprises a primary circulating loop and a secondary circulating loop which are arranged in parallel, the primary circulating loop and the secondary circulating loop are respectively provided with an independent circulating liquid outlet and a circulating liquid inlet, the circulating liquid outlets of the primary circulating loop and the secondary circulating loop are arranged on the reactant collecting chamber at intervals along the height direction, the position of the circulating liquid outlet of the primary circulating loop is lower than that of the circulating liquid outlet of the secondary circulating loop, a primary circulating pump and a primary circulating heat exchanger are connected between the circulating liquid outlet and the ci