Continuous production system for chlorinated paraffin

Abstract

The utility model relates to a continuous production system for chlorinated paraffin. The continuous production system comprises a chlorine supply part, a liquid paraffin supply part, a chlorination reaction part and a tail gas treatment part, the chlorination reaction part comprises a plurality of main chlorination kettles and a plurality of auxiliary chlorination kettles, ultraviolet lamps are arranged in the main chlorination kettles and the auxiliary chlorination kettles, and heat exchangers are connected outside the main chlorination kettles and the auxiliary chlorination kettles; all the main chlorination kettles are arranged in series, and wax oil flows into the next main chlorination kettle from the previous main chlorination kettle in an overflow manner; wax oil flows into the next auxiliary chlorination kettle from the previous auxiliary chlorination kettle in an overflow manner, and the last auxiliary chlorination kettle is connected with the first main chlorination kettle to feed the wax oil; tail gas generated in the main chlorination kettle sequentially enters the previous auxiliary chlorination kettle from the next auxiliary chlorination kettle, and the flowing path of the tail gas is opposite to the flowing path of wax oil. The method has the advantages of high equipment utilization rate, short production period, low cost, high chlorination conversion rate and the like.

Description

Technical Field

[0001] The utility model relates to a chlorinated paraffin continuous production system. Background Art

[0002] Chlorinated paraffin has many excellent physical and chemical properties such as low volatility, flame retardancy, good electrical insulation and chemical corrosion resistance. It can be used as a flame retardant, polyvinyl chloride auxiliary plasticizer, etc. It is widely used in the production of plastics, cables, flooring materials, hoses, artificial leather and rubber products, etc. It can also be used as an additive for paints, coatings and lubricants.

[0003] Chlorinated paraffin is generally produced by reacting and absorbing chlorine and paraffin in a reactor under certain temperature and pressure conditions. Traditional reactors are intermittent production reactors, and the reaction process needs to be interrupted after each reaction and the reactor is opened for discharge. The reaction process in the reactor is intermittent, which is cumbersome to operate, has a long production cycle, and has low production efficiency, and cannot meet the needs of continuous production processes. Intermittent reactions generally use a top-in and top-out material loading and unloading method, resulting in uneven product density, incomplete reactions, waste of raw materials, unstable quality, poor reaction effects, and high costs. Utility Model Content

[0004] The utility model aims to provide a chlorinated paraffin continuous production system to solve the technical problems in the prior art that intermittent production easily leads to incomplete reaction, waste of raw materials and unstable product quality.

[0005] In order to solve the above problems, the chlorinated paraffin continuous production system provided by the utility model adopts the following technical solutions:

[0006] A chlorinated paraffin continuous production system, comprising a chlorine gas supply part, a liquid paraffin supply part, a chlorination reaction part and a tail gas treatment part;

[0007] The chlorination reaction part includes multiple main chlorination kettles and multiple auxiliary chlorination kettles. The kettle walls of each main chlorination kettle and each auxiliary chlorination kettle are provided with an air inlet, an air outlet, a liquid inlet, a liquid outlet and an overflow port, and are provided with an ultraviolet lamp inside and connected to a heat exchanger outside; the main chlorination kettles are arranged in series with each other, and the overflow port of the previous main chlorination kettle is connected to the liquid inlet of the next main chlorination kettle, so that the wax oil flows from the previous main chlorination kettle to the next main chlorination kettle by overflow; the auxiliary chlorination kettles are arranged in series with each other, and the overflow port of the previous auxiliary chlorination kettle is connected to the liquid inlet of the next auxiliary chlorination kettle, so that the wax oil flows from the previous auxiliary chlorination kettle to the next auxiliary chlorination kettle by overflow;

[0008] The liquid paraffin supply part includes a wax oil storage tank, which pumps the wax oil into the first auxiliary chlorination reactor through a wax oil delivery pump, and the last auxiliary chlorination reactor is connected to the first main chlorination reactor to deliver the wax oil;

[0009] The chlorine supply part includes a chlorine supply source and a chlorine distribution table, and a chlorine inlet pipe is connected between the chlorine distribution table and the air inlet of each main chlorination kettle;

[0010] The gas outlet of each main chlorination kettle is connected to a tail gas emission branch pipe, the tail gas emission branch pipe is connected to a tail gas emission main pipe, a tail gas delivery pipe is connected between the gas outlet of the rear auxiliary chlorination kettle and the gas inlet of the front auxiliary chlorination kettle, the tail gas emission main pipe is connected to the gas inlet of the last auxiliary chlorination kettle, so that the tail gas enters the front auxiliary chlorination kettle from the rear auxiliary chlorination kettle in sequence, and the gas outlet of the first auxiliary chlorination kettle is connected to the tail gas treatment part.

[0011] Furthermore, the main chlorination kettles are provided with eight units, and the auxiliary chlorination kettles are provided with three units.

[0012] Furthermore, each main chlorination kettle is connected to a paraffin circulation pump, the inlet of the paraffin circulation pump is connected to the liquid outlet of the main chlorination kettle, and the outlet of the paraffin circulation pump is connected to the inlet of the corresponding heat exchanger; each main chlorination kettle is also provided with a liquid return port, and the outlet of the heat exchanger is connected to the liquid return port of the main chlorination kettle.

[0013] Furthermore, a condenser, an acid-oil separator and a purification tower are arranged between the tail gas treatment part and the first secondary chlorination kettle, the inlet of the condenser is connected to the gas outlet of the first secondary chlorination kettle, the gas outlet of the condenser is connected to the gas inlet of the acid-oil separator, the liquid outlet of the acid-oil separator is connected to the liquid inlet of the first secondary chlorination kettle, and the gas outlet of the acid-oil separator is connected to the purification tower and the tail gas treatment part; the purification tower is provided with a wax oil outlet connected to the liquid inlet of the first secondary chlorination kettle, and is also provided with a hydrochloric acid outlet for connecting to the concentrated acid tank.

[0014] Furthermore, the tail gas treatment part includes a first falling film absorber, a second falling film absorber, a first acid absorber, a second acid absorber and a third acid absorber which are arranged in series in sequence, and the gas outlet of the acid-oil separator is connected to the gas inlet of the first falling film absorber, so that the tail gas separated from the acid-oil separator enters the first falling film absorber, the second falling film absorber, the first acid absorber, the second acid absorber and the third acid absorber in sequence; the third acid absorber is connected to a primary water pipeline, and the primary water flows from the third acid absorber to the second acid absorber and the first acid absorber to replenish the liquid level in each acid absorption tower.

[0015] Furthermore, the second falling film absorption tower and the first acid absorption tower are both connected to a dilute acid tank for storing low-concentration hydrochloric acid, the dilute acid tank is connected to the concentrated acid tank through an acid delivery pipe, the acid delivery pipe is provided with a dilute acid circulation pump, and the dilute acid circulation pump is respectively connected to the second falling film absorption tower and the first acid absorption tower through two return liquid pipes.

[0016] Furthermore, the second acid absorption tower and the third acid absorption tower are both connected to a hydrochloric acid circulation pump, which is used to extract the liquid at the bottom of the second acid absorption tower or the third acid absorption tower and pump it into the acid absorption tower again from the top of the tower.

[0017] Furthermore, the tail gas treatment part also includes a first alkali washing tower and a second alkali washing tower connected in series, the air inlet of the first alkali washing tower is connected to the air outlet of the third acid absorption tower, the liquid outlet of the first alkali washing tower is connected to the secondary sodium storage tank, and the liquid outlet of the second alkali washing tower is connected to the liquid alkali absorption tank; a secondary sodium circulation pump is connected between the liquid return port of the first alkali washing tower and the secondary sodium storage tank, a liquid alkali circulation pump is connected between the liquid return port of the second alkali washing tower and the liquid alkali absorption tank, and a liquid alkali conveying pipe is also connected between the liquid alkali circulation pump and the secondary sodium storage tank.

[0018] Furthermore, the last main chlorination kettle is connected to the chlorinated paraffin refining part, which includes a degassing kettle, which is used to remove hydrogen chloride and chlorine in the chlorinated paraffin, and the gas outlet of the degassing kettle is connected to the gas inlet of the third acid absorption tower through an exhaust pipe; it also includes at least two finished product storage tanks with different viscosities connected to the liquid outlet of the degassing kettle, and each finished product storage tank is commonly connected to a modulation tank.

[0019] The beneficial effects of the chlorinated paraffin continuous production system of the utility model are:

[0020] 1. The utility model adopts a combination of thermal chlorination and photochlorination to continuously produce chlorinated paraffin. Liquid paraffin is continuously fed and continuously reacts with chlorine during transportation. Therefore, the content of chlorinated paraffin in the last main chlorination kettle is higher than that in the previous main chlorination kettle. When the material enters the last main chlorination kettle, the material in the kettle has been basically reacted completely, thereby improving the conversion rate. In addition, the tail gas discharged from each main chlorination kettle enters each secondary chlorination kettle in turn along a path opposite to the flow path of the liquid paraffin, and pre-reacts in each secondary chlorination kettle to absorb the incompletely reacted chlorine. Before the tail gas enters the tail gas treatment part, the volatile wax oil is separated by an acid oil separator and an extraction tower and re-enters the chlorination reaction part for reaction. The whole system has a short production cycle, high conversion efficiency, stable product quality, and easy process control.

[0021] 2. The tail gas produced by the chlorination reaction adopts a five-stage absorption, using primary water as the absorption medium. The tail gas first passes through a two-stage falling film absorption tower to absorb most of the hydrogen chloride and trace chlorine in the tail gas, and then passes through a three-stage acid absorption tower to absorb the remaining tail gas. The tail gas treatment effect is good; and the tail gas treatment process can produce by-products hydrochloric acid and sodium hypochlorite, with a high chlorination conversion rate and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0023] Figure 1 Schematic diagram of the continuous production system of chlorinated paraffin of the utility model Figure 1 ;

[0024] Figure 2 Schematic diagram of the continuous production system of chlorinated paraffin of the utility model Figure 2 .

[0025] Description of reference numerals:

[0026] 1. Liquid chlorine storage tank; 2. Liquid chlorine vaporizer; 3. Chlorine buffer tank; 4. Chlorinated wax oil conditioning tank; 5. Low viscosity storage tank; 6. Medium viscosity storage tank; 7. High viscosity storage tank; 8. Degassing kettle; 9. Chlorination temporary storage tank; 10. Main chlorination kettle; 11. Paraffin circulation pump; 12. Heat exchanger; 13. Conditioning and delivery pump; 14. Product delivery pump; 15. Third auxiliary chlorination kettle; 16. Second auxiliary chlorination kettle; 17. First auxiliary chlorination kettle; 18. Extraction tower; 19. Condenser; 20. Acid oil separation device; 21, the first falling film absorption tower; 22, the second falling film absorption tower; 23, the first acid absorption tower; 24, the second acid absorption tower; 25, the third acid absorption tower; 26, the first alkali washing tower; 27, the hydrochloric acid circulation pump; 28, the wax oil storage tank; 29, the wax oil delivery pump; 30, the concentrated acid tank; 31, the concentrated acid circulation pump; 32, the dilute acid tank; 33, the dilute acid circulation pump; 34, the secondary sodium storage tank; 35, the secondary sodium circulation pump; 36, the liquid alkali absorption tank; 37, the liquid alkali circulation pump; 38, the second alkali washing tower. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0028] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0029] Specific embodiments of the chlorinated paraffin continuous production system provided by the utility model:

[0030] like Figure 1 and Figure 2As shown, the chlorinated paraffin continuous production system includes a chlorine supply part, a liquid paraffin supply part, a chlorination reaction part and a tail gas treatment part. Among them, the chlorine supply part includes a liquid chlorine storage tank 1, a liquid chlorine vaporizer 2, a chlorine buffer tank 3 and a chlorine distribution table, and the liquid chlorine storage tank 1 serves as a chlorine gas supply source. The liquid paraffin supply part includes a wax oil storage tank 28, which is used to store raw liquid paraffin. The raw liquid paraffin is naturally settled to obtain refined paraffin (the raw liquid paraffin should be liquid paraffin after hydrogenation refining).

[0031] The chlorination reaction part includes eight main chlorination kettles 10 and three auxiliary chlorination kettles, and the three auxiliary chlorination kettles are respectively the first auxiliary chlorination kettle 17, the second auxiliary chlorination kettle 16 and the third auxiliary chlorination kettle 15 arranged in sequence. The kettle wall of each main chlorination kettle 10 and each auxiliary chlorination kettle is provided with an air inlet, an air outlet, a liquid inlet, a liquid outlet, a liquid return port and an overflow port, and an ultraviolet lamp is provided inside for illumination, and a heat exchanger 12 and a paraffin circulation pump 11 are connected to the outside. Among them, the eight main chlorination kettles 10 are arranged in series with each other and are connected to each other by pipes. The overflow port of the previous main chlorination kettle 10 is connected to the liquid inlet of the next main chlorination kettle 10, so that the wax oil flows from the previous main chlorination kettle 10 to the next main chlorination kettle 10 by overflow; each auxiliary chlorination kettle is arranged in series with each other, and the overflow port of the previous auxiliary chlorination kettle is connected to the liquid inlet of the next auxiliary chlorination kettle, so that the wax oil flows from the previous auxiliary chlorination kettle to the next auxiliary chlorination kettle by overflow. The inlet of the paraffin circulation pump 11 is connected to the liquid outlet of the main chlorination kettle 10, and the outlet of the paraffin circulation pump 11 is connected to the inlet of the corresponding heat exchanger 12; each main chlorination kettle 10 is also provided with a liquid return port, and the outlet of the heat exchanger 12 is connected to the liquid return port of the main chlorination kettle 10. The provision of the paraffin circulation pump 11 can increase the circulation and improve the reaction rate.

[0032] Liquid chlorine comes from the liquid chlorine storage tank 1 and is sent to the vaporization area by pipeline. The liquid chlorine enters the liquid chlorine vaporizer 2, and after being heated and vaporized by hot water (provided by the hot water tank), it enters the chlorine buffer tank 3 for pressure stabilization. The chlorine gas inlet pipes are respectively connected between the chlorine gas distribution station and the air inlet of each main chlorination kettle 10. After the chlorine gas distribution station is flow-controlled and metered, it enters the eight main chlorination kettles 10 along the chlorine gas inlet pipes. The refined liquid paraffin is pumped into the first auxiliary chlorination kettle 17 by the wax oil delivery pump 29, and then enters the second auxiliary chlorination kettle 16 and the third auxiliary chlorination kettle 15 in turn by overflow. The third auxiliary chlorination kettle 15 is connected to the first main chlorination kettle 10, and the wax oil overflows from the third auxiliary chlorination kettle 15 into the first main chlorination kettle 10, and flows to the subsequent main chlorination kettles 10 in turn by overflow. In each main chlorination kettle 10, chlorine gas reacts with liquid paraffin under the irradiation of ultraviolet rays. The liquid paraffin in the present application is continuously fed and continuously reacts with chlorine during the transportation process, so the content of chlorinated paraffin in the last main chlorination kettle 10 is higher than that in the previous main chlorination kettle 10. When the material enters the last main chlorination kettle 10, the material in the kettle has basically reacted completely and overflowed into the chlorination temporary storage kettle. In normal production, the degree and output of chlorination are controlled by adjusting the flow of chlorine and liquid paraffin. Since the chlorination reaction is an exothermic reaction, it needs to be cooled with circulating water after reaching a certain temperature. The hydrogen chloride produced by the reaction and a trace of unreacted chlorine enter each auxiliary chlorination kettle to further improve the utilization rate of chlorine.

[0033] Specifically, the gas outlet of each main chlorination kettle 10 is connected to a tail gas discharge branch pipe, the tail gas discharge branch pipe is connected to a tail gas discharge main pipe, the gas outlet of the rear auxiliary chlorination kettle and the gas inlet of the front auxiliary chlorination kettle are connected to a tail gas delivery pipe, and the tail gas discharge main pipe is connected to the gas inlet of the last auxiliary chlorination kettle, so that the tail gas enters the front auxiliary chlorination kettle from the rear auxiliary chlorination kettle in sequence, that is, the tail gas reacted from each main chlorination kettle 10 enters the third auxiliary chlorination kettle 15, the second auxiliary chlorination kettle 16 and the first auxiliary chlorination kettle 17 in sequence, which is opposite to the flow path of the wax oil. At this time, the paraffin in the third auxiliary chlorination kettle 15, the second auxiliary chlorination kettle 16 and the first auxiliary chlorination kettle 17 can be pre-reacted with the tail gas (containing hydrogen chloride and chlorine that does not participate in the reaction) to recover the chlorine that is not completely reacted in the main reaction section.

[0034] The gas outlet of the first secondary chlorination kettle 17 is connected to the tail gas treatment part. Specifically, in this embodiment, the tail gas treatment part includes a first falling film absorber 21, a second falling film absorber 22, a first acid absorber 23, a second acid absorber 24 and a third acid absorber 25 arranged in series in sequence, and the gas outlet of the acid-oil separator 20 is connected to the gas inlet of the first falling film absorber 21, so that the tail gas separated from the acid-oil separator 20 enters the first falling film absorber 21, the second falling film absorber 22, the first acid absorber 23, the second acid absorber 24 and the third acid absorber 25 in sequence; the third acid absorber 25 is connected to a primary water pipeline, and the primary water flows from the third acid absorber 25 to the second acid absorber 24 and the first acid absorber 23 to replenish the liquid level in each acid absorber.

[0035] A condenser 19, an acid oil separator 20 and a purification tower 18 are also provided between the first secondary chlorination kettle 17 and the first falling film absorption tower 21. The acid oil separator 20 can separate wax oil and hydrochloric acid, and the purification tower 18 can separate wax oil and hydrochloric acid. The wax oil has a small density and is in the upper layer, and the hydrochloric acid is in the lower layer. The inlet of the condenser 19 is connected to the gas outlet of the first secondary chlorination kettle 17, the gas outlet of the condenser 19 is connected to the gas inlet of the acid oil separator 20, the liquid outlet of the acid oil separator 20 is connected to the liquid inlet of the first secondary chlorination kettle 17, and the gas outlet of the acid oil separator 20 is connected to the purification tower 18 and the tail gas treatment part; the purification tower 18 is provided with a wax oil outlet connected to the liquid inlet of the first secondary chlorination kettle 17, and is also provided with a hydrochloric acid outlet for connecting to the concentrated acid tank 30, and the concentrated acid tank 30 pumps the concentrated hydrochloric acid into the tank area for storage through the concentrated acid circulation pump 31.

[0036] The second falling film absorption tower 22 and the first acid absorption tower 23 are both connected to a dilute acid tank 32 for storing low-concentration hydrochloric acid. The dilute acid tank 32 is connected to the concentrated acid tank 30 through an acid delivery pipe. The acid delivery pipe is provided with a dilute acid circulation pump 33. The dilute acid circulation pump 33 is respectively connected to the second falling film absorption tower 22 and the first acid absorption tower 23 through two liquid return pipes. The second acid absorption tower 24 and the third acid absorption tower 25 are both connected to a hydrochloric acid circulation pump 27. The hydrochloric acid circulation pump 27 is used to extract the liquid at the bottom of the second acid absorption tower 24 or the third acid absorption tower 25 and pump it into the acid absorption tower again from the top of the tower.

[0037] The tail gas treatment part also includes a first alkali washing tower 26 and a second alkali washing tower 38 connected in series, the air inlet of the first alkali washing tower 26 is connected to the air outlet of the third acid absorption tower 25, the liquid outlet of the first alkali washing tower 26 is connected to the secondary sodium storage tank 34, and the liquid outlet of the second alkali washing tower 38 is connected to the liquid alkali absorption tank 36; a secondary sodium circulation pump 35 is connected between the liquid return port of the first alkali washing tower 26 and the secondary sodium storage tank 34, a liquid alkali circulation pump 37 is connected between the liquid return port of the second alkali washing tower 38 and the liquid alkali absorption tank 36, and a liquid alkali conveying pipe is also connected between the liquid alkali circulation pump 37 and the secondary sodium storage tank 34.

[0038] In the present application, tail gas absorption adopts five-stage absorption, using primary water as absorption medium, tail gas first passes through two-stage falling film absorption tower to absorb most of hydrogen chloride and trace chlorine in tail gas, and then passes through three-stage acid absorption tower to absorb remaining tail gas. The absorption liquid coming out of the first-stage falling film absorption tower enters concentrated acid tank 30 for circulation, and when the specific gravity reaches the required requirement, it is controlled by density sensor and regulating valve and sent to hydrochloric acid storage tank. The tail gas absorption part is after the secondary chlorination kettle to avoid contact between water vapor and liquid wax, improve product quality, and at the same time, since the liquid wax may contain low flash point hydrocarbons, from the perspective of safety, concentrated acid tank 30 increases nitrogen sealing, and a breathing valve is installed to release air at the same time, and concentrated acid tank 30 is provided with a delivery port for extracting oil phase. If oil phase is precipitated during long-term operation, the start and stop of condensed wax oil pump is controlled by interface liquid level transmitter, and the first secondary chlorination kettle 17 is returned to continue to participate in chlorination reaction.

[0039] The tail gas discharged from the tail gas absorption section enters two alkali absorption towers, which use 30% liquid alkali as an absorbent to absorb chlorine and hydrogen chloride in the tail gas to produce a byproduct of sodium hypochlorite (effective chlorine content 12%). The two alkali absorption towers are arranged in series, and the tail gas absorbed by the first alkali washing tower 26 enters the second alkali washing tower 38 for further absorption. The tail gas after absorption is discharged into the atmosphere. Using two absorption towers makes it easier to completely absorb the residual chlorine and reduce environmental pollution.

[0040] The last main chlorination kettle 10 is connected to the chlorinated paraffin refining part, which includes two degassing kettles 8, which are used to remove hydrogen chloride and chlorine from the chlorinated paraffin. The gas outlets of the two degassing kettles 8 are connected to the gas inlet of the third acid absorption tower 25 through an exhaust pipe. The material in the chlorination temporary storage tank 9 is pumped into the degassing kettle 8 by a chlorinated wax oil temporary storage delivery pump, and dry compressed air is introduced into the degassing kettle 8 at the same time to blow out the hydrogen chloride and chlorine dissolved in the chlorinated paraffin. The blown gas enters the third acid absorption tower 25 for treatment. The chlorinated paraffin refining part also includes a low-viscosity storage tank 5, a medium-viscosity storage tank 6 and a high-viscosity storage tank 7 connected to the liquid outlet of the degassing kettle 8, and the storage tanks of different viscosities are connected to a chlorinated wax oil modulation tank. After the blowing is completed, a stabilizer is added to the degassing kettle 8 to form a chlorinated paraffin finished product. Since the amount of stabilizer is very small, a metering pump is used to add it. The degassing delivery pump delivers the product from the bottom of the kettle to storage tanks with different viscosities, and then pumps it into the chlorinated wax oil conditioning tank 4 through the product delivery pump 14. After being mixed in the chlorinated wax oil conditioning tank 4, the conditioning delivery pump 13 delivers it to the tank area for storage, packaging and sale.

[0041] It should be noted that, in practice, the number of acid absorption towers is selected according to the actual absorption effect. The number of main chlorination kettle 10 and auxiliary chlorination kettle is not limited to the number described in this application, and can be arranged according to actual needs.

Claims

1. A chlorinated paraffin continuous production system, comprising a chlorine supply part, a liquid paraffin supply part, a chlorination reaction part and a tail gas treatment part, characterized in that: The chlorination reaction part includes multiple main chlorination kettles and multiple auxiliary chlorination kettles. The kettle walls of each main chlorination kettle and each auxiliary chlorination kettle are provided with an air inlet, an air outlet, a liquid inlet, a liquid outlet and an overflow port, and are provided with an ultraviolet lamp inside and connected to a heat exchanger outside; the main chlorination kettles are arranged in series with each other, and the overflow port of the previous main chlorination kettle is connected to the liquid inlet of the next main chlorination kettle, so that the wax oil flows from the previous main chlorination kettle to the next main chlorination kettle by overflow; the auxiliary chlorination kettles are arranged in series with each other, and the overflow port of the previous auxiliary chlorination kettle is connected to the liquid inlet of the next auxiliary chlorination kettle, so that the wax oil flows from the previous auxiliary chlorination kettle to the next auxiliary chlorination kettle by overflow; The liquid paraffin supply part includes a wax oil storage tank, which pumps the wax oil into the first auxiliary chlorination reactor through a wax oil delivery pump, and the last auxiliary chlorination reactor is connected to the first main chlorination reactor to deliver the wax oil; The chlorine supply part includes a chlorine supply source and a chlorine distribution table, and a chlorine inlet pipe is connected between the chlorine distribution table and the air inlet of each main chlorination kettle; The gas outlet of each main chlorination kettle is connected to a tail gas emission branch pipe, the tail gas emission branch pipe is connected to a tail gas emission main pipe, a tail gas delivery pipe is connected between the gas outlet of the rear auxiliary chlorination kettle and the gas inlet of the front auxiliary chlorination kettle, the tail gas emission main pipe is connected to the gas inlet of the last auxiliary chlorination kettle, so that the tail gas enters the front auxiliary chlorination kettle from the rear auxiliary chlorination kettle in sequence, and the gas outlet of the first auxiliary chlorination kettle is connected to the tail gas treatment part.

2. The continuous production system of chlorinated paraffin according to claim 1, characterized in that: The main chlorination kettles are provided with eight units, and the auxiliary chlorination kettles are provided with three units.

3. The continuous production system of chlorinated paraffin according to claim 1, characterized in that: A paraffin circulation pump is also connected to the outside of each main chlorination kettle, the inlet of the paraffin circulation pump is connected to the liquid outlet of the main chlorination kettle, and the outlet of the paraffin circulation pump is connected to the inlet of the corresponding heat exchanger; each main chlorination kettle is also provided with a liquid return port, and the outlet of the heat exchanger is connected to the liquid return port of the main chlorination kettle.

4. The continuous production system of chlorinated paraffin according to any one of claims 1 to 3, characterized in that: A condenser, an acid-oil separator and a purification tower are arranged between the tail gas treatment part and the first auxiliary chlorination kettle. The inlet of the condenser is connected to the gas outlet of the first auxiliary chlorination kettle, the gas outlet of the condenser is connected to the gas inlet of the acid-oil separator, the liquid outlet of the acid-oil separator is connected to the liquid inlet of the first auxiliary chlorination kettle, and the gas outlet of the acid-oil separator is connected to the purification tower and the tail gas treatment part; the purification tower is provided with a wax oil outlet connected to the liquid inlet of the first auxiliary chlorination kettle, and is also provided with a hydrochloric acid outlet for connecting to the concentrated acid tank.

5. The continuous production system of chlorinated paraffin according to claim 4, characterized in that: The tail gas treatment part includes a first falling film absorption tower, a second falling film absorption tower, a first acid absorption tower, a second acid absorption tower and a third acid absorption tower which are arranged in series in sequence. The gas outlet of the acid-oil separator is connected to the gas inlet of the first falling film absorption tower, so that the tail gas separated from the acid-oil separator enters the first falling film absorption tower, the second falling film absorption tower, the first acid absorption tower, the second acid absorption tower and the third acid absorption tower in sequence; the third acid absorption tower is connected to a primary water pipeline, and the primary water flows from the third acid absorption tower to the second acid absorption tower and the first acid absorption tower to replenish the liquid level in each acid absorption tower.

6. The continuous production system of chlorinated paraffin according to claim 5, characterized in that: The second falling film absorption tower and the first acid absorption tower are both connected to a dilute acid tank for storing low-concentration hydrochloric acid. The dilute acid tank is connected to the concentrated acid tank through an acid delivery pipe. The acid delivery pipe is provided with a dilute acid circulation pump. The dilute acid circulation pump is respectively connected to the second falling film absorption tower and the first acid absorption tower through two return liquid pipes.

7. The continuous production system of chlorinated paraffin according to claim 6, characterized in that: The second acid absorption tower and the third acid absorption tower are both connected to a hydrochloric acid circulation pump, which is used to extract the liquid at the bottom of the second acid absorption tower or the third acid absorption tower and pump it into the acid absorption tower again from the top of the tower.

8. The continuous production system of chlorinated paraffin according to any one of claims 5 to 7, characterized in that: The tail gas treatment part also includes a first alkali washing tower and a second alkali washing tower connected in series, the air inlet of the first alkali washing tower is connected to the air outlet of the third acid absorption tower, the liquid outlet of the first alkali washing tower is connected to a secondary sodium storage tank, and the liquid outlet of the second alkali washing tower is connected to a liquid alkali absorption tank; a secondary sodium circulation pump is connected between the liquid return port of the first alkali washing tower and the secondary sodium storage tank, a liquid alkali circulation pump is connected between the liquid return port of the second alkali washing tower and the liquid alkali absorption tank, and a liquid alkali conveying pipe is also connected between the liquid alkali circulation pump and the secondary sodium storage tank.

9. The continuous production system of chlorinated paraffin according to any one of claims 5 to 7, characterized in that: The last main chlorination kettle is connected to the chlorinated paraffin refining part, which includes a degassing kettle for removing hydrogen chloride and chlorine from the chlorinated paraffin. The gas outlet of the degassing kettle is connected to the gas inlet of the third acid absorption tower through an exhaust pipe; it also includes at least two finished product storage tanks with different viscosities connected to the liquid outlet of the degassing kettle, and each finished product storage tank is commonly connected to a modulation tank.

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