Closed cleaning system for polymer material reaction kettle

Abstract

The utility model discloses a closed cleaning system for a polymer material reaction kettle, which belongs to the technical field of chemical cleaning equipment and is characterized in that a reaction stirring kettle, a cooler, a buffer tank, a pump body I, a filter, a clear liquid tank and a pump body II are sequentially connected with one another, and a steam inlet pipe and a condensate outlet pipe are respectively arranged on the side surface of the reaction stirring kettle; a gas phase inlet and outlet valve device is arranged on the steam inlet pipe, a liquid phase inlet and outlet valve is arranged on the condensate outlet pipe, a heating outer coil pipe is arranged on the outer wall of the reaction stirring kettle to heat the reaction kettle, and a discharge valve is arranged on a pipeline between the reaction stirring kettle and the cooler. The problems that in the 1-octene production process, an existing reaction kettle cleaning technology is complex in treatment and low in operation efficiency are solved, and the reaction kettle cleaning device is mainly applied to the aspect of chemical engineering cleaning equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chemical cleaning equipment technical field, concretely relates to a kind of reaction kettle polymer material reaction kettle closed cleaning system. BACKGROUND

[0002] When producing 1-octene by ethylene oligomerization method, overpolymerization phenomenon inevitably occurs in the reaction process, thereby generating ethylene polymer. These polymers can adhere to the reactor wall and stirring paddle, and as the reaction kettle operation cycle is continuously extended, the thickness of the adhered polymer gradually accumulates. This condition can have a serious negative impact on the heat exchange efficiency of the reactor, causing heat transfer to be blocked, thereby affecting the temperature control of the entire reaction process. At the same time, it also interferes with the accurate measurement of process parameters, making it difficult for operators to accurately grasp the actual situation of the reaction and unable to timely and accurately adjust the process. Therefore, after the reactor has been running for a certain period of time, it must be arranged for parking maintenance and cleaning work to ensure that the reactor can operate normally and maintain a good working condition.

[0003] The current cleaning technology mainly uses high-pressure water gun cleaning. After the reactor is parked, it must first be thoroughly purged and replaced. After the indicators are detected to be qualified, the reactor can be opened. Then, high-pressure water gun is used for flushing operation, with a cleaning pressure of up to 1100 kg. Even so, a small part of the extremely firm adhered material cannot be completely removed by the high-pressure water gun, which requires manual removal with special tools.

[0004] For example, in the PVC production process, the reactor also faces the problem of polymer material adhesion. In dealing with this problem, high-pressure water gun flushing is also used to solve the cleaning of the reactor adhered material. However, this high-pressure water gun cleaning technology has many obvious shortcomings.

[0005] Firstly, before high-pressure water gun cleaning, it is necessary to ensure that the process of the reaction system meets the requirements, which often requires a lot of time. Moreover, after cleaning is completed, the system needs to be purged again to ensure that the dew point, oxygen content and other indicators in the system meet the qualified standards, which requires a considerable amount of time. During this period, a large amount of nitrogen resources is consumed, and the overall cleaning process is extremely inefficient.

[0006] Secondly, when the high-pressure water gun is cleaning, the impact force generated by the high water pressure is large, which can cause damage to the flatness and roughness of the inner wall of the reaction kettle to a certain extent. Once the inner wall surface is damaged, the subsequent material is more likely to adhere to it, thereby further exacerbating the material adhesion problem. In addition, for the residual material that cannot be removed by the high-pressure water gun, it is also easy to cause scratching damage to the inner wall of the reaction kettle during manual removal, affecting the smoothness of the inner wall, and further leading to more serious material adhesion, forming a vicious cycle.

[0007] Thirdly, the high-pressure water gun cleaning operation consumes a lot of manpower and has low working efficiency. More importantly, this cleaning operation belongs to the type of limited space operation, and there is a high safety risk during the operation. The operator needs to operate in the relatively narrow and closed reaction kettle space, and once an accident occurs, such as high-pressure water gun out of control, gas leakage, etc., the evacuation and rescue of personnel will be greatly increased, which is easy to cause safety accidents and poses a serious threat to the life safety of personnel. In view of the above problems, the present application provides a reaction kettle polymer material reaction kettle closed cleaning system. Content of the utility model

[0008] The utility model aims at providing a reaction kettle polymer material reaction kettle closed cleaning system to solve the technical problem that the existing flat push polyethylene wax discharge tank is extremely inconvenient to use a shovel to slowly shovel down during discharging.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a 1-octene reaction kettle polymer material reaction kettle closed cleaning system, which comprises a reaction stirring kettle, a cooler, a buffer tank, a pump body one, a filter, a clear liquid tank and a pump body two, characterized in that: the reaction stirring kettle, the cooler, the buffer tank, the pump body one, the filter, the clear liquid tank and the pump body two are sequentially and mutually connected, the side surface of the reaction stirring kettle is respectively provided with a steam inlet pipe and a condensate outlet pipe, a gas phase inlet and outlet valve device is arranged on the steam inlet pipe, and a liquid phase inlet and outlet valve is arranged on the condensate outlet pipe; the reaction kettle is heated by arranging a heating outer coil pipe on the outer wall of the reaction stirring kettle; and a discharge valve is arranged on the pipeline between the reaction stirring kettle and the cooler.

[0010] Preferably, the gas phase inlet and outlet valve device comprises a connecting pipe, a maintenance valve one, a maintenance valve two, a gas phase inlet and outlet valve and a maintenance valve three, the connecting pipe is communicated with the steam inlet pipe at both ends, the maintenance valve one is arranged on the connecting pipe, and the maintenance valve two, the gas phase inlet and outlet valve and the maintenance valve three are sequentially arranged on the steam inlet pipe between the both ends of the connecting pipe, so that the gas phase inlet and outlet valve is convenient to maintain.

[0011] Preferably, a drain trap is arranged on the condensate outlet pipe, the drain trap automatically discharges the condensed water in the steam system, prevents steam leakage at the same time, and ensures the efficient operation and energy saving of the system.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1, use reaction process same solvent as heat carrier and dissolving solution, need not carry out reaction kettle process treatment before and after cleaning, thereby greatly save parking time, improve the utilization efficiency of reaction kettle,

[0014] 2, hot melt process, no mechanical impact and friction, will not cause damage to the inner wall of reaction kettle,

[0015] 3, use solvent to carry out heat conduction, heat the reaction kettle polymer thoroughly, clean once,

[0016] 4, solvent can be reused through recovery. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the system diagram of the utility model. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0019] EMBODIMENT

[0020] Please refer to Figure 1 The utility model provides a kind of technical scheme: a reaction kettle polymer material reaction kettle closed cleaning system, including reaction stirred tank 1, cooler 2, buffer tank 3, pump body one 4, filter 5, clear liquid tank 6 and pump body two 7, it is characterized by: reaction stirred tank 1, cooler 2, buffer tank 3, pump body one 4, filter 5, clear liquid tank 6 and pump body two 7 are sequentially interconnected, reaction stirred tank 1 side is respectively provided with steam inlet pipe 11 and condensate outlet pipe 12, steam inlet pipe 11 is provided with gas phase inlet valve device 13, condensate outlet pipe 12 is provided with liquid phase inlet valve 14, utilize the heating outer coil pipe 15 on the outer wall of reaction stirred tank 1 to heat reaction kettle, discharge valve 16 is provided on the pipeline between reaction stirred tank 1 and cooler 2.

[0021] In an embodiment, gas phase inlet valve device 13 includes connecting pipe 91, maintenance valve one 92, maintenance valve two 93, gas phase inlet valve 94 and maintenance valve three 95, connecting pipe 91 is communicated with steam inlet pipe 11 at both ends, maintenance valve one 92 is provided on connecting pipe 91, maintenance valve two 93, gas phase inlet valve 94 and maintenance valve three 95 are sequentially provided on steam inlet pipe 11 between the both ends of connecting pipe 91, steam trap 8 is provided on condensate outlet pipe 12.

[0022] A kind of 1-octene reactor polymer reactor closed cleaning principle:

[0023] First step: when the polymer increases in reaction stirred tank 1, influence normal production operation, to reaction stirred tank 1 is filled with solvent solvent is normal reaction solvent, liquid level is higher than normal reaction 20%.

[0024] Second step: close steam inlet pipe 11 and set up gas phase inlet valve 13, condensate outlet pipe 12 and set up liquid phase inlet valve 14, utilize the heating outer coil 15 of reaction stirred tank 1 to heat reaction stirred tank 1, to temperature rises to 150 DEG C corresponding pressure 0.3MPa, start heat preservation, reaction stirred tank 1 is stirred, stirs 2h.

[0025] Third step: cut off heat source, stop heat preservation, open reaction stirred tank 1 bottom and unload valve 16, after dissolving the mixture material is unloaded to cooler 2, control cooler 2 outlet temperature 70-80 DEG C

[0026] Fourth step: after the material of cooler 2 is unloaded to buffer tank 3, is filtered after pump body one 4 conveying filter 5, after filtration, clear liquid is to clear liquid tank 6, wait for the next time to use, filter residue is treated as hazardous waste.

[0027] Although the embodiments of the present application have been shown and described, it should be understood that various changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the principles and spirit of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A closed cleaning system for a reactor polymer material reactor, comprising a reaction stirring kettle (1), a cooler (2), a buffer tank (3), a pump body one (4), a filter (5), a clear liquid tank (6) and a pump body two (7), characterized in that: The reaction stirring kettle (1), the cooler (2), the buffer tank (3), the pump body one (4), the filter (5), the clear liquid tank (6) and the pump body two (7) are sequentially and mutually connected, the reaction stirring kettle (1) side is respectively provided with the steam inlet pipe (11) and the condensate outlet pipe (12), the steam inlet pipe (11) is provided with the gas phase inlet and outlet valve device (13), the condensate outlet pipe (12) is provided with the liquid phase inlet and outlet valve (14), the reaction kettle is heated by the heating outer coil pipe (15) arranged on the outer wall of the reaction stirring kettle (1), the pipeline between the reaction stirring kettle (1) and the cooler (2) is provided with the unloading valve (16).

2. The closed cleaning system for a polymerization reactor according to claim 1, wherein: The gas phase inlet and outlet valve device (13) includes the connecting pipe (91), the maintenance valve one (92), the maintenance valve two (93), the gas phase inlet and outlet valve (94) and the maintenance valve three (95), the connecting pipe (91) two ends are communicated with the steam inlet pipe (11), the connecting pipe (91) is provided with the maintenance valve one (92), the steam inlet pipe (11) between the connecting pipe (91) two ends is sequentially provided with the maintenance valve two (93), the gas phase inlet and outlet valve (94) and the maintenance valve three (95).

3. The system of claim 1, wherein the system further comprises a cleaning system. The condensate outlet pipe (12) is provided with the drain trap (8).

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