Monomer cyclopentadiene cracking preparation system

Abstract

The utility model discloses a monomer cyclopentadiene cracking preparation system which comprises an azeotropic pipeline, a cracking pipeline, a water distribution pipeline and a cryogenic receiving tank, the azeotropic pipeline is communicated with the cracking pipeline, the cracking pipeline is communicated with the water distribution pipeline, the water distribution pipeline is communicated with the azeotropic pipeline through a water return pipeline, and the cryogenic receiving tank is communicated with the cracking pipeline. And the water distribution pipeline is communicated with the cryogenic receiving tank. According to the utility model, the dicyclopentadiene and water are vaporized at a relatively low temperature by utilizing azeotropy of the dicyclopentadiene and the water, so that the coking phenomenon of the dicyclopentadiene in the cracking process is effectively controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical synthesis, in particular to a monomer cyclopentadiene cracking preparation system. Background Art

[0002] Cyclopentadiene (DCPD) is a highly chemically active alicyclic hydrocarbon. 5 One of the main dienes in the fraction, it contains a conjugated double bond and an active methylene group. It is very active and can undergo a series of reactions such as polymerization, oxidation, addition, condensation and reduction. It is widely used in the synthesis of pharmaceutical intermediates, plastics, petroleum resins, cyclopentadiene compounds and new polymer materials. Since cyclopentadiene can self-polymerize into dicyclopentadiene at room temperature, it is generally stored and transported in the form of dicyclopentadiene in industry. In many chemical reactions, cyclopentadiene monomer (CPD) is mostly used, so dicyclopentadiene is generally cracked before the chemical reaction to prepare monomer cyclopentadiene and stored at -20°C or used as it is prepared.

[0003] Dicyclopentadiene begins to decompose at temperatures above 150°C. This characteristic of cyclopentadiene is mainly used in industry to vaporize and crack dicyclopentadiene. During the application process, cyclopentadiene is prone to undergo polymerization side reactions at high temperatures to produce polymers, which cause coking in the vaporizer, preheater and cracking tower, resulting in reduced cracking yield, reduced efficiency, and inability to produce continuous production. Utility Model Content

[0004] The purpose of the utility model is to provide a monomer cyclopentadiene cracking preparation system in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A monomer cyclopentadiene cracking preparation system comprises an azeotropic pipeline, a cracking pipeline, a water distribution pipeline and a cryogenic receiving tank, wherein the azeotropic pipeline is connected to the cracking pipeline, the cracking pipeline is connected to the water distribution pipeline, the water distribution pipeline is connected to the azeotropic pipeline through a return water pipeline, and the water distribution pipeline is connected to the cryogenic receiving tank.

[0007] Preferably, the azeotropic pipeline includes a vaporizer and a preheater, the vaporizer is respectively connected to the pure water pipeline and the dicyclopentadiene supply pipeline, the vaporizer is connected to the preheater, and the preheater is connected to the cracking pipeline; the pure water pipeline is connected to the return water pipeline, and the dicyclopentadiene supply pipeline is connected to the cracking pipeline.

[0008] Preferably, the cracking pipeline includes a cracking and separation tower, a cracker and a separation condenser, the air inlet of the cracker is connected to the air outlet of the preheater, the air outlet of the cracker is connected to the inlet of the cracking and separation tower, the outlet of the cracking and separation tower is connected to the air inlet of the separation condenser, and the liquid outlet of the separation condenser is connected to the water diversion pipeline; the top outlet of the cracking and separation tower is connected to the dicyclopentadiene supply pipeline.

[0009] Preferably, the water diversion pipeline includes a condenser, a water separator and a screening tower, the liquid inlet of the condenser is connected to the liquid outlet of the separation condenser, the liquid outlet of the condenser is connected to the liquid inlet of the water separator, the liquid outlet of the water separator is connected to the inlet of the screening tower, and the outlet of the screening tower is connected to the deep-cold receiving tank; the water outlet of the water separator is connected to the pure water pipeline.

[0010] Preferably, the control temperature of the preheater is 150°C-200°C, and the control temperature of the cracker is 320°C-350°C.

[0011] Preferably, the control temperature of the separation condenser is 35°C-42°C.

[0012] Preferably, the condenser is controlled at 0°C-18°C, and the deep-freeze receiving tank is controlled at -16°C--20°C.

[0013] Compared with the prior art, the beneficial effects are:

[0014] The utility model utilizes the azeotropic effect of dicyclopentadiene and water to vaporize it at a relatively low temperature, so that the coking phenomenon of dicyclopentadiene in the cracking process is effectively controlled; after being heated by a preheater, it enters a cracking and separation tower to realize the vapor phase cracking of dicyclopentadiene and the separation of monomer cyclopentadiene at the same time; the separated monomer cyclopentadiene passes through a water separator and a screening tower to dry and remove water from the monomer cyclopentadiene; the dried monomer cyclopentadiene is sent to a receiving tank with a deep-cold jacket for short-term storage to provide raw materials for the next chemical reaction. The device effectively controls the polymerization coking of dicyclopentadiene; improves the cracking efficiency; the comprehensive yield of the product is relatively high, which can reach more than 98%; the purity of the obtained cyclopentadiene monomer is relatively high, which can reach more than 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a principle diagram of the utility model.

[0017] The following are the descriptions of the reference numerals:

[0018] 1 is a vaporizer, 2 is a preheater, 3 is a cracking and separation tower, 4 is a cracker, 5 is a separation condenser, 6 is a condenser, 7 is a water separator, 8 is a screening tower, and 9 is a deep-cold receiving tank. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1 , the technical solution of the utility model is further explained:

[0020] like Figure 1 As shown, the utility model discloses a monomer cyclopentadiene cracking preparation system, including an azeotropic pipeline, a cracking pipeline, a water-dividing pipeline and a cryogenic receiving tank, wherein the azeotropic pipeline is connected to the cracking pipeline, the cracking pipeline is connected to the water-dividing pipeline, and the water-dividing pipeline is connected to the cryogenic receiving tank. That is to say, firstly, water and dicyclopentadiene are respectively sent to the azeotropic pipeline through the pure water pipeline and the dicyclopentadiene supply pipeline, and the azeotropic of dicyclopentadiene and water is utilized to vaporize it at a relatively low temperature, so that the coking phenomenon of dicyclopentadiene in the cracking process is effectively controlled; then, the gasified dicyclopentadiene and water enter the cracking pipeline for cracking to realize the separation of the monomer cyclopentadiene, and the monomer cyclopentadiene is then dried and dehydrated through the water-dividing pipeline, and finally sent to a receiving tank with a cryogenic jacket for short-term storage, so as to provide raw materials for the next chemical reaction.

[0021] Furthermore, the water distribution pipeline is connected to the azeotropic pipeline through a return pipeline. That is, the water after the cyclopentadiene monomer is dried and dehydrated in the water distribution pipeline is sent to the azeotropic pipeline through the return pipeline to participate in the reaction again, thereby improving the utilization rate of water resources.

[0022] Specifically, Figure 1 As shown, the azeotropic pipeline includes a vaporizer 1 and a preheater 2, the vaporizer 1 is respectively connected to the pure water pipeline and the dicyclopentadiene supply pipeline, the vaporizer 1 is connected to the preheater 2, and the preheater 1 is connected to the cracking pipeline; that is, dicyclopentadiene and water are added to the vaporizer in proportion, and the temperature of the vaporizer is adjusted at 98°C, so that dicyclopentadiene and water are azeotropically vaporized in the vaporizer, and the azeotrope of dicyclopentadiene and water is heated to 180°C by the preheater and then enters the cracking pipeline.

[0023] It should be noted that the preheater is a shell-and-tube heat exchanger whose shell-side heating medium is heat transfer oil or a heating tube with a built-in electric heating rod, and its control temperature is 150°C-200°C, preferably 180°C in this embodiment.

[0024] Furthermore, the pure water pipeline is connected to the return water pipeline, and the dicyclopentadiene supply pipeline is connected to the cracking pipeline. That is, the water dried and dehydrated by the water diversion pipeline is sent to the pure water pipeline through the return water pipeline, and then sent to the vaporizer through the pure water pipeline to participate in the reaction again; at the same time, the dicyclopentadiene and water that are not cracked in the cracking pipeline are condensed and refluxed, and are taken out through the side line and sent to the vaporizer through the dicyclopentadiene supply pipeline to participate in azeotropic vaporization again.

[0025] Specifically, Figure 1 As shown, the cracking pipeline includes a cracking separation tower 3, a cracker 4 and a separation condenser 5, the air inlet of the cracker 4 is connected to the air outlet of the preheater 2, the air outlet of the cracker 4 is connected to the inlet of the cracking separation tower 3, the outlet of the cracking separation tower 3 is connected to the air inlet of the separation condenser 5, and the liquid outlet of the separation condenser 5 is connected to the water diversion pipeline. That is to say, the dicyclopentadiene and water azeotrope enters the bottom of the cracking separation tower, and the cracker temperature is adjusted to 320-350°C, so that the dicyclopentadiene is fully cracked in the cracker; the cracked monomer cyclopentadiene gas rises in the cracking separation tower, and is distilled and separated, and the separation condenser temperature is adjusted to 35-42°C. The vapor phase material passing through the separation condenser is the cracked monomer cyclopentadiene, and then the monomer cyclopentadiene is dried and dehydrated through the water diversion pipeline.

[0026] It should be noted that the control temperature of the cracker is 320°C-350°C. The cracker is a shell-and-tube heat exchanger whose shell-side heating medium is heat transfer oil or a heating tube with a built-in electric heating rod, and in this embodiment, it is preferably 330°C; the separation condenser is a shell-and-tube heat exchanger, and its shell-side cooling medium is normal temperature circulating water, and the control temperature is 35-42°C, preferably 38-40°C.

[0027] Furthermore, the top outlet of the cracking and separation tower 3 is connected to the dicyclopentadiene supply pipeline. That is, in the cracking stage, the uncracked dicyclopentadiene and water are condensed and refluxed, a part of which is sent to the dicyclopentadiene supply pipeline through the top of the cracking and separation tower through the side line, and the other part is dropped in the cracking and separation tower to adjust the tower body step temperature.

[0028] Specifically, Figure 1As shown, the water separation pipeline includes a condenser 6, a water separator 7 and a screening tower 8, the liquid inlet of the condenser 6 is connected to the liquid outlet of the separation condenser 5, the liquid outlet of the condenser 6 is connected to the liquid inlet of the water separator 7, the liquid outlet of the water separator 7 is connected to the inlet of the screening tower 8, and the outlet of the screening tower 8 is connected to the deep cold receiving tank 9; that is, the vapor phase material passing through the separation condenser is the cracked monomer cyclopentadiene, the temperature of the top condenser is adjusted to 0-10°C, the cracked monomer cyclopentadiene is further condensed, the condensed monomer cyclopentadiene enters the water separator, a small amount of residual water is separated, the monomer cyclopentadiene after water separation is further sent to the deep cold receiving tank for storage after removing trace water through the screening tower, and is prepared for the subsequent chemical reaction system.

[0029] Furthermore, the water outlet of the water separator 7 is connected to the pure water pipeline. That is, a small amount of residual water is separated by the water separator, and the separated water is sent to the pure water pipeline through the water outlet and the pipeline, and then sent back to the vaporizer to participate in the reaction again.

[0030] It should be noted that the condenser is a shell-and-tube heat exchanger, and its shell-side cooling medium is low-temperature chilled water, and the control temperature is 0-10°C, preferably 8-10°C; the deep-cold receiving tank is a jacketed cooling and insulation tank, and its jacket cooling medium is low-temperature chilled water, and the control temperature is -16--20°C; the screening tower is a water absorption tower with a built-in 4A molecular sieve.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A monomer cyclopentadiene cracking preparation system, characterized in that: It includes an azeotropic pipeline, a cracking pipeline, a water distribution pipeline and a cryogenic receiving tank. The azeotropic pipeline is connected to the cracking pipeline, the cracking pipeline is connected to the water distribution pipeline, the water distribution pipeline is connected to the azeotropic pipeline through a return water pipeline, and the water distribution pipeline is connected to the cryogenic receiving tank.

2. The monomer cyclopentadiene cracking preparation system according to claim 1, characterized in that: The azeotropic pipeline includes a vaporizer and a preheater, the vaporizer is respectively connected to a pure water pipeline and a dicyclopentadiene supply pipeline, the vaporizer is connected to the preheater, and the preheater is connected to the cracking pipeline; the pure water pipeline is connected to the return water pipeline, and the dicyclopentadiene supply pipeline is connected to the cracking pipeline.

3. The monomer cyclopentadiene cracking preparation system according to claim 2, characterized in that: The cracking pipeline includes a cracking and separation tower, a cracker and a separation condenser. The air inlet of the cracker is connected to the air outlet of the preheater, the air outlet of the cracker is connected to the inlet of the cracking and separation tower, the outlet of the cracking and separation tower is connected to the air inlet of the separation condenser, and the liquid outlet of the separation condenser is connected to the water diversion pipeline; the top outlet of the cracking and separation tower is connected to the dicyclopentadiene supply pipeline.

4. The system for preparing cyclopentadiene monomer by cracking as claimed in claim 3, characterized in that: The water diversion pipeline includes a condenser, a water separator and a screening tower. The liquid inlet of the condenser is connected to the liquid outlet of the separation condenser, the liquid outlet of the condenser is connected to the liquid inlet of the water separator, the liquid outlet of the water separator is connected to the inlet of the screening tower, and the outlet of the screening tower is connected to the deep-cold receiving tank; the water outlet of the water separator is connected to the pure water pipeline.

5. The monomer cyclopentadiene cracking preparation system according to claim 2, characterized in that: The control temperature of the preheater is 150°C-200°C, and the control temperature of the cracker in the cracking pipeline is 320°C-350°C.

6. The system for preparing cyclopentadiene monomer by cracking as claimed in claim 3, characterized in that: The control temperature of the separation condenser is 35°C-42°C.

7. The system for preparing cyclopentadiene monomer by cracking as claimed in claim 4, characterized in that: The temperature of the condenser is controlled at 0°C-18°C, and the temperature of the deep-freeze receiving tank is controlled at -16°C--20°C.

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