Vacuum unit of flexible foam polyether polyol reaction kettle

Abstract

The utility model relates to the technical field of flexible foam polyether polyol processing and production, in particular to a flexible foam polyether polyol reaction kettle vacuum unit which comprises a reaction kettle main body, an initiator input pipe is arranged at the top end of the reaction kettle main body, an epoxypropane input pipe is arranged on one side of the initiator input pipe, and an epoxypropane output pipe is arranged on the other side of the epoxypropane input pipe. A vacuum pipeline is arranged on one side of the epoxypropane input pipe and connected with a vacuum buffer tank, the vacuum buffer tank is connected with an input port of a roots pump, an output port of the roots pump is connected with a liquid ring pump, an output port of the liquid ring pump is connected with a spiral heat exchange assembly, an output port of the spiral heat exchange assembly is connected with a high-temperature storage tank, and the high-temperature storage tank is connected with a vacuum pump. An output port of the high-temperature storage tank is connected with a circulating pump, an output port of the circulating pump is provided with a connecting pipe, and by means of the structure of the spiral pipe, the liquid inlet pipe, the liquid outlet pipe, the high-temperature storage tank, the circulating pump and the connecting pipe, the problems that a traditional vacuum unit is low in waste gas waste heat recovery rate, lacks a preheating mechanism for raw materials and is serious in energy waste are solved.

Description

Technical Field

[0001] This utility model relates to the field of flexible foam polyether polyol processing and production technology, specifically a vacuum unit for a flexible foam polyether polyol reactor. Background Technology

[0002] Flexible polyether polyol is a key chemical raw material mainly used in the production of flexible polyurethane foam (such as sofa cushions, mattresses, and car seats). It is polymerized from propylene oxide (PO) or ethylene oxide (EO) with initiators (such as glycerol or sucrose) under the action of a catalyst. Its molecular chain contains multiple hydroxyl groups (-OH), which can react with isocyanates to form polyurethane. Its characteristics include high molecular weight, low viscosity, and moderate reactivity, giving the foam material its softness and elasticity, making it a core raw material for the production of flexible polyurethane foam.

[0003] Traditional vacuum units have low waste heat recovery rates and lack preheating mechanisms for raw materials, resulting in significant energy waste.

[0004] Therefore, it is particularly important to design a vacuum unit for a flexible foam polyether polyol reactor to overcome the above-mentioned technical defects and improve the overall practicality. Utility Model Content

[0005] The purpose of this invention is to provide a vacuum unit for a flexible foam polyether polyol reactor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A vacuum unit for a flexible foam polyether polyol reactor includes a reactor body. An initiator input pipe is located at the top of the reactor body. A propylene oxide input pipe is located on one side of the initiator input pipe. A vacuum pipe is located on one side of the propylene oxide input pipe. The vacuum pipe is connected to a vacuum buffer tank. The vacuum buffer tank is connected to the inlet of a Roots pump. The outlet of the Roots pump is connected to a liquid ring pump. The outlet of the liquid ring pump is connected to a spiral heat exchanger assembly. The outlet of the spiral heat exchanger assembly is connected to a high-temperature storage tank. The outlet of the high-temperature storage tank is connected to a circulation pump. The outlet of the circulation pump is equipped with a connecting pipe.

[0008] The spiral heat exchange assembly includes a conduit with a spiral tube inside. One end of the spiral tube is connected to the output port of a liquid ring pump. The conduit is provided with an inlet pipe and an outlet pipe.

[0009] As a preferred embodiment of this utility model, the vacuum pipe is made of stainless steel and its inner wall is electrolytically polished and its outer wall is covered with a polyurethane insulation layer. The top of the reactor body is provided with a feeding port. One-way valves are provided on the connecting pipe, the liquid outlet pipe and the output port of the high-temperature storage tank, and a solenoid valve is provided on one side of the one-way valve.

[0010] As a preferred embodiment of this utility model, the connecting pipe spirals around the outside of the propylene oxide input pipe along its height direction.

[0011] As a preferred embodiment of this utility model, one end of the connecting pipe is connected to the output port of the circulating pump, the other end of the connecting pipe is connected to the inlet pipe, and a leak-proof sealing gasket is provided at the interface between the inlet pipe and the spiral tube.

[0012] As a preferred embodiment of this utility model, the top of the vacuum buffer tank is provided with a detachable filter element by bolts, and the filter element is made of sintered stainless steel.

[0013] As a preferred embodiment of this utility model, the inner wall of the high-temperature storage tank is provided with a ceramic coating, and the outer layer is wrapped with a rock wool insulation layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, a vacuum unit for a flexible foam polyether polyol reactor is designed. Utilizing a structure consisting of a spiral tube, inlet pipe, outlet pipe, high-temperature storage tank, circulation pump, and connecting pipe, the initiator and propylene oxide enter the reactor through the inlet pipe. Polymerization occurs under the action of a catalyst. Reaction byproducts and unreacted gases are drawn to a buffer tank through a corrosion-resistant vacuum pipe, filtered by a sintered stainless steel filter element, and then compressed by a Roots pump-liquid ring pump series before entering the spiral heat exchange assembly. The liquid ring pump discharges high-temperature waste gas, which exchanges heat with the circulating medium within the outer conduit of the spiral tube. The recovered heat is stored in the high-temperature storage tank. When preheating is required, the circulation pump transports the heat medium through the spiral wound tube to the outside of the propylene oxide inlet pipe for further circulation. This utilizes residual heat to raise the raw material temperature. The spiral structure enhances heat transfer efficiency, solving the problems of low waste heat recovery rate and lack of preheating mechanism for raw materials in traditional vacuum units, resulting in significant energy waste. Attached Figure Description

[0016] Figure 1 This is a plan view of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall process of this utility model;

[0018] Figure 3 This is a schematic diagram of the spiral heat exchange component of this utility model.

[0019] In the diagram: 1. Reactor body; 101. Initiator inlet pipe; 102. Propylene oxide inlet pipe; 103. Vacuum pipe; 104. Vacuum buffer tank; 105. Roots pump; 106. Liquid ring pump; 2. Spiral heat exchange assembly; 201. Conduit; 202. Spiral tube; 203. Liquid inlet pipe; 204. Liquid outlet pipe; 107. High-temperature storage tank; 108. Circulation pump; 109. Connecting pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] For examples, please refer to Figure 1-3 This utility model provides a technical solution:

[0025] A vacuum unit for a flexible foam polyether polyol reactor includes a reactor body 1. An initiator input pipe 101 is located at the top of the reactor body 1. A propylene oxide input pipe 102 is located on one side of the initiator input pipe 101. A vacuum pipe 103 is located on one side of the propylene oxide input pipe 102. The vacuum pipe 103 is connected to a vacuum buffer tank 104. The vacuum buffer tank 104 is connected to the inlet of a Roots pump 105. The outlet of the Roots pump 105 is connected to a liquid ring pump 106. The outlet of the liquid ring pump 106 is connected to a spiral heat exchange assembly 2. The outlet of the spiral heat exchange assembly 2 is connected to a high-temperature storage tank 107. The outlet of the high-temperature storage tank 107 is connected to a circulation pump 108. The outlet of the circulation pump 108 is provided with a connecting pipe 109. The spiral heat exchange assembly 2 includes a conduit 201. A spiral tube 202 is located inside the conduit 201. One end of the spiral tube 202 is connected to the outlet of the liquid ring pump 106. An inlet pipe 203 and an outlet pipe 204 are provided on the conduit 201. Initiator and raw materials enter the reactor body 1 through initiator input pipe 101 and propylene oxide input pipe 102. Under the action of catalyst, polymerization reaction occurs. During the reaction, vacuum pipe 103 draws reaction byproducts and unreacted gas to vacuum buffer tank 104. After mechanical impurities are intercepted by sintered stainless steel filter element in the tank, the gas is pressurized by Roots pump 105 and compressed by liquid ring pump 106 before entering spiral heat exchange component 2. High-temperature waste gas discharged by liquid ring pump is discharged into waste gas treatment system through spiral pipe 202. The circulating medium between spiral pipe 202 and conduit 201 exchanges heat with high-temperature waste gas. The recovered heat is stored in high-temperature storage tank 107. When needed, circulation pump 108 transports the heat medium in high-temperature storage tank to the outside of propylene oxide input pipe 102 through spirally wound connecting pipe 109 to preheat raw materials using residual heat. The spiral structure of connecting pipe 109 enhances heat transfer efficiency. The ceramic coating and rock wool insulation layer of high-temperature storage tank 107 ensure stable heat storage.

[0026] The vacuum pipe 103 is made of 316L stainless steel, with its inner wall electrolytically polished and its outer wall covered with a polyurethane insulation layer. The top of the reactor body (1) is provided with a feeding port. One-way valves are provided on the output ports of the connecting pipe (109), the liquid outlet pipe (204), and the high-temperature storage tank (107), and a solenoid valve is provided on one side of each one-way valve. Due to the strong corrosiveness of propylene oxide, austenitic stainless steel is selected to resist chloride ion corrosion. The connecting pipe 109 spirals around the outside of the propylene oxide input pipe 102 along its height direction. The structure improves the heat transfer coefficient. One end of the connecting pipe 109 is connected to the output port of the circulating pump 108, and the other end of the connecting pipe 109 is connected to the liquid inlet pipe 203. A leak-proof sealing gasket is provided at the interface between the liquid inlet pipe 203 and the spiral pipe 202. The elastic deformation of the gasket is used to compensate for the thermal expansion of the pipeline. A removable filter element is provided on the top of the vacuum buffer tank 104 by bolts. The filter element is made of sintered stainless steel, which intercepts most of the reaction by-products and mechanical impurities and protects the rotor blades of the Roots pump from damage. The inner wall of the high-temperature storage tank 107 is covered with a ceramic coating and the outer layer is wrapped with a rock wool insulation layer.

[0027] The working process of this utility model is as follows: When using the vacuum unit of this flexible foam polyether polyol reactor, the initiator and raw materials first enter the reactor body 1 through the initiator input pipe 101 and the propylene oxide input pipe 102. Under the action of the catalyst, a polymerization reaction occurs. During the reaction, the vacuum pipe 103 draws the reaction byproducts and unreacted gases to the vacuum buffer tank 104. After the sintered stainless steel filter element in the tank intercepts mechanical impurities, the gas is successively pressurized by the Roots pump 105 and compressed by the liquid ring pump 106 before entering the spiral heat exchange assembly 2. The liquid ring pump then discharges the gas. The high-temperature waste gas is discharged into the waste gas treatment system through the spiral tube 202. The circulating medium between the spiral tube 202 and the conduit 201 exchanges heat with the high-temperature waste gas. The recovered heat is stored in the high-temperature storage tank 107. When needed, the circulating pump 108 transports the heat medium in the high-temperature storage tank to the outside of the propylene oxide input pipe 102 through the spirally wound connecting pipe 109 to preheat the raw materials using waste heat. The spiral structure of the connecting pipe 109 enhances the heat transfer efficiency. The ceramic coating and rock wool insulation layer of the high-temperature storage tank 107 ensure stable storage of heat energy.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0029] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art. Among them, the reaction vessel, Roots pump, liquid ring pump, vacuum buffer tank and circulating pump are all existing mature equipment that can be purchased from the market. The control method is through a controller. The control circuit of the controller can be implemented by a person skilled in the art through simple circuit connection. It is common knowledge in the field. Therefore, this application will not explain the control method and circuit connection in detail.

Claims

1. A vacuum unit for a flexible foam polyether polyol reactor, comprising a reactor body (1), characterized in that: The reactor body (1) is provided with an initiator input pipe (101) at the top. A propylene oxide input pipe (102) is provided on one side of the initiator input pipe (101). A vacuum pipe (103) is provided on one side of the propylene oxide input pipe (102). The vacuum pipe (103) is connected to a vacuum buffer tank (104). The vacuum buffer tank (104) is connected to the inlet of a Roots pump (105). The outlet of the Roots pump (105) is connected to a liquid ring pump (106). The outlet of the liquid ring pump (106) is connected to a spiral heat exchange assembly (2). The outlet of the spiral heat exchange assembly (2) is connected to a high-temperature storage tank (107). The outlet of the high-temperature storage tank (107) is connected to a circulation pump (108). The outlet of the circulation pump (108) is provided with a connecting pipe (109). The spiral heat exchange assembly (2) includes a conduit (201), inside which is a spiral tube (202), one end of which is connected to the output port of a liquid ring pump (106), an inlet pipe (203) on the conduit (201), and an outlet pipe (204) on the conduit (201).

2. The vacuum unit for a flexible foam polyether polyol reactor according to claim 1, characterized in that: The vacuum pipe (103) is made of 316L stainless steel and its inner wall is electrolytically polished and its outer wall is covered with a polyurethane insulation layer. The top of the reactor body (1) is provided with a feeding port. The output ports of the connecting pipe (109), the liquid outlet pipe (204), and the high temperature storage tank (107) are respectively provided with check valves, and a solenoid valve is provided on one side of the check valve.

3. The vacuum unit for a flexible foam polyether polyol reactor according to claim 1, characterized in that: The connecting pipe (109) spirals around the outside of the propylene oxide inlet pipe (102) along its height direction.

4. The vacuum unit for a flexible foam polyether polyol reactor according to claim 1, characterized in that: One end of the connecting pipe (109) is connected to the output port of the circulating pump (108), and the other end of the connecting pipe (109) is connected to the inlet pipe (203). A leak-proof sealing gasket is provided at the interface between the inlet pipe (203) and the spiral pipe (202).

5. The vacuum unit for a flexible foam polyether polyol reactor according to claim 1, characterized in that: The vacuum buffer tank (104) has a detachable filter element on its top by bolts, and the filter element is made of sintered stainless steel.

6. The vacuum unit for a flexible foam polyether polyol reactor according to claim 1, characterized in that: The inner wall of the high-temperature storage tank (107) is coated with a ceramic coating and wrapped with a rock wool insulation layer on the outside.

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