A chlorinated paraffin production process for improving raw material utilization

Abstract

The invention discloses a chlorinated paraffin production process for improving raw material utilization, belongs to the technical field of chlorinated paraffin production, and comprises the following steps: S1: purchasing, storing, and standby; S2: sedimentation and stratification, storing, and standby; S3: preheating liquid paraffin; S4: waiting for liquid paraffin to be measured; S5: introducing liquid paraffin, turning on fluorescent lamps and cooling water to make the temperature of a chlorination reactor constant, introducing chlorine, carrying out chlorination reaction, checking the relative density and chlorine content of the chlorinated paraffin, and stopping the chlorine when the requirements are met, turning off the fluorescent lamps and cooling water; S6: purifying waste gas, generating hydrochloric acid and oxygen; S7: storing oxygen; S8: storing hydrochloric acid solution; S9: degassing oxygen, and performing waste gas purification on the removed gas; S10: adding a pH regulator and stability; S11: washing, decompression, and dehydration to a water content of ≤2% to obtain a finished product; the invention can ensure that chlorine and liquid paraffin are fully contacted and reacted to generate chlorinated paraffin, avoid the problem of insufficient reaction, and improve the raw material utilization.

Description

Technical Field

[0001] The invention belongs to the technical field of chlorinated paraffin production, and in particular relates to a chlorinated paraffin production process for improving raw material utilization. Background Art

[0002] Chlorinated paraffin is a chlorinated derivative of paraffin hydrocarbons. It has the advantages of low volatility, flame retardancy, good electrical insulation and low price. It is widely used in flame retardancy of plastics and rubber, waterproof and fire retardant additives for fabrics, additives for coatings and inks, and additives for pressure-resistant lubricants.

[0003] The traditional chlorinated paraffin production process is: adding a measured amount of raw wax oil into a chlorination reactor, turning on the fluorescent lamp and cooling water in the reactor to maintain the temperature in the reactor at 40-60°C, introducing chlorine, checking the relative density and chlorine content of the chlorinated paraffin, stopping the introduction of chlorine when the required chlorine content is reached, turning off the fluorescent lamp and cooling water, adding the reacted chlorinated paraffin into a degassing tower, degassing for 3-4 hours to remove the contained hydrogen chloride and unreacted chlorine, adding the degassed chlorinated paraffin into a container at a temperature of 100°C, adding 40% caustic soda solution while stirring, neutralizing to pH 6-7, and filtering the discharged material to obtain the finished product.

[0004] The inventors of the present application have discovered that the existing production process has the problem of insufficient reaction between chlorine and liquid wax, resulting in a large amount of unreacted chlorine being discharged as waste gas, low raw material utilization rate, and reduced production efficiency of the enterprise. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a chlorinated paraffin production process for improving the utilization rate of raw materials, which has the characteristic of improving the utilization rate of raw materials.

[0006] To achieve the above object, the present invention provides the following technical solution: a chlorinated paraffin production process for improving raw material utilization, comprising the following steps:

[0007] S1: Purchase high-quality liquid paraffin, liquid chlorine, pH regulator and stabilizer, and store them in A liquid paraffin tank, liquid chlorine tank, regulator tank and stabilizer tank respectively for standby use;

[0008] S2: The liquid paraffin is settled and stratified in the A liquid paraffin tank, and the liquid paraffin after the settlement and stratification is pumped into the B liquid paraffin tank by the A liquid paraffin pump for storage and standby use;

[0009] S3: The liquid paraffin in the B liquid paraffin tank is pumped into the constant temperature preheating tank for preheating by the B liquid paraffin pump;

[0010] S4: The preheated liquid paraffin in the constant temperature preheating tank is pumped into the metering tank by the C liquid paraffin pump for standby use;

[0011] S5: liquid paraffin is introduced into the spray plate of the chlorination reactor through the metering tank of the metering tank, and the liquid paraffin is sprayed into the chlorination reactor through the spray head of the spray plate, the fluorescent lamp and cooling water of the chlorination reactor are turned on to make the temperature of the chlorination reactor constant, the liquid chlorine is pumped into the chlorine gasifier for gasification through the liquid chlorine pump, and the chlorine is introduced into the spray pipe of the chlorination reactor through the gasification tank of the chlorine gasifier, and the chlorine enters from bottom to top through the spray head of the spray pipe, and the liquid paraffin and the chlorine react with chlorination. During the chlorination reaction, the liquid paraffin at the bottom of the chlorination reactor is pumped into the spray plate by the D liquid paraffin pump for spraying, and continuously contacts and reacts with the chlorine, and the relative density and chlorine content of the chlorinated paraffin in the chlorine reactor are checked. When the required chlorine content is reached, the chlorine is stopped, and the fluorescent lamp and cooling water are turned off;

[0012] S6: The HCL and CL2 mixed gas generated during the reaction is pumped into the aqueous solution tank through a purification pump, the HCL gas dissolves in water to generate hydrochloric acid, the CL2 gas dissolves in water to generate hydrochloric acid and hypochlorous acid, and the hypochlorous acid decomposes to generate hydrochloric acid and oxygen;

[0013] S7: Pump oxygen into the oxygen tank for storage through oxygen pump A;

[0014] S8: pumping the hydrochloric acid solution into a hydrochloric acid tank for storage through a hydrochloric acid pump;

[0015] S9: The reacted chlorinated paraffin is pumped into the degassing reactor by the wax pump A, and oxygen is pumped into the degassing reactor by the oxygen pump B. The oxygen blows the chlorinated paraffin to remove the hydrogen chloride gas on the surface of the chlorinated paraffin. The blown hydrogen chloride gas is pumped into the aqueous solution tank by the purification pump for reaction generation;

[0016] S10: pumping the degassed chlorinated paraffin into the reactor through the B wax pump, pumping the pH regulator in the regulator tank into the reactor through the regulator pump, heating and stirring, allowing the pH regulator to fully react with the chlorinated paraffin to neutralize the pH, pumping the stabilizer in the stabilizer tank into the reactor through the stabilizer pump, heating and stirring, until the reaction is fully completed;

[0017] S11: The chlorinated paraffin that has fully reacted with the stabilizer is pumped into the packaging equipment through a material pump. The packaging equipment washes the chlorinated paraffin under reduced pressure and dehydrates it to a water content of ≤2% to obtain a finished product.

[0018] Preferably, in step S2, the water content in the liquid paraffin after sedimentation and stratification is ≤0.015%.

[0019] Preferably, in step S3, the constant temperature range of the constant temperature preheating tank is 80-90°C.

[0020] Preferably, in step S5, the constant temperature range of the chlorination reactor is 40-60°C.

[0021] Preferably, in step S5, the chlorine gas introduction pressure value of the chlorine gasifier is 0.10-0.20Mpa.

[0022] Preferably, in step S10, the stirring speed is 300-500 r / min, and the stirring time is 10-25 min.

[0023] Preferably, in step S10, the neutralization value of pH is between 6 and 7.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention draws liquid paraffin into an upper spray pipe, and sprays it from top to bottom through the spray head of the spray pipe; after liquid chlorine is gasified by a chlorine gasifier, it is drawn into a lower spray pipe, and sprayed from bottom to top through the spray head of the spray pipe. This chlorination reaction mode can ensure that chlorine and liquid paraffin fully contact and react to generate chlorinated paraffin, and avoid the problem of insufficient reaction. At the same time, the spray head of chlorine is downward, and the liquid paraffin at the bottom of the chlorination reactor can be re-drawn into the upper spray pipe by a liquid paraffin pump for spraying. This chlorination reaction mode can make the liquid paraffin repeatedly contact and react with chlorine, and can avoid the problem that the liquid paraffin blocks the spray head and causes the chlorine to be unable to enter, thereby improving the utilization rate of raw materials.

[0026] 2. The oxygen in the degassing process of the present invention is formed by the reaction of HCL gas generated in the chlorination reaction process in an aqueous solution, which can achieve waste recycling and reduce the cost of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flow chart of the chlorinated paraffin production process for improving raw material utilization of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the chlorinated paraffin spray pipe of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the chlorine spray pipe of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] See also Figure 1-3 The present invention provides the following technical solution: A chlorinated paraffin production process for improving raw material utilization, comprising the following steps:

[0033] S1: Purchase high-quality liquid paraffin, liquid chlorine, pH regulator and stabilizer, and store them in A liquid paraffin tank, liquid chlorine tank, regulator tank and stabilizer tank respectively for standby use;

[0034] S2: The liquid paraffin is settled and stratified in the A liquid paraffin tank, and the liquid paraffin with a moisture content of ≤0.015% after the settlement and stratification is pumped into the B liquid paraffin tank for storage and standby use by the A liquid paraffin pump;

[0035] S3: The liquid paraffin in the B liquid paraffin tank is pumped to a constant temperature preheating tank at 80°C for preheating by means of the B liquid paraffin pump;

[0036] S4: The preheated liquid paraffin in the constant temperature preheating tank is pumped into the metering tank by the C liquid paraffin pump for standby use;

[0037] S5: liquid paraffin is passed into the spray plate of the chlorination reactor through the metering tank of the metering tank, and the liquid paraffin is sprayed into the chlorination reactor through the spray head of the spray plate, the fluorescent lamp and cooling water of the chlorination reactor are turned on, so that the temperature of the chlorination reactor is constant at 40°C, liquid chlorine is pumped into the chlorine gasifier for gasification through a liquid chlorine pump, chlorine is passed into the spray pipe of the chlorination reactor through the gasification tank of the chlorine gasifier at a pressure of 0.10Mpa, chlorine enters from bottom to top through the spray head of the spray pipe, and liquid paraffin and chlorine react with chlorination. During the chlorination reaction, the liquid paraffin at the bottom of the chlorination reactor is pumped into the spray plate by the D liquid paraffin pump for spraying, and continuously contacts and reacts with chlorine. The relative density and chlorine content of the chlorinated paraffin in the chlorine reactor are checked. When the required chlorine content is reached, the chlorine is stopped, and the fluorescent lamp and cooling water are turned off;

[0038] S6: The HCL and CL2 mixed gas generated during the reaction is pumped into the aqueous solution tank through a purification pump, the HCL gas dissolves in water to generate hydrochloric acid, the CL2 gas dissolves in water to generate hydrochloric acid and hypochlorous acid, and the hypochlorous acid decomposes to generate hydrochloric acid and oxygen;

[0039] S7: Pump oxygen into the oxygen tank for storage through oxygen pump A;

[0040] S8: pumping the hydrochloric acid solution into a hydrochloric acid tank for storage through a hydrochloric acid pump;

[0041] S9: The reacted chlorinated paraffin is pumped into the degassing reactor by the wax pump A, and oxygen is pumped into the degassing reactor by the oxygen pump B. The oxygen blows the chlorinated paraffin to remove the hydrogen chloride gas on the surface of the chlorinated paraffin. The blown hydrogen chloride gas is pumped into the aqueous solution tank by the purification pump for reaction generation;

[0042] S10: pumping the degassed chlorinated paraffin into the reactor through the B wax pump, pumping the pH regulator in the regulator tank into the reactor through the regulator pump, stirring at a stirring speed of 300 r / min for 25 minutes while heating, so that the pH regulator and the chlorinated paraffin fully react and are neutralized to pH 6, pumping the stabilizer in the stabilizer tank into the reactor through the stabilizer pump, stirring at a stirring speed of 300 r / min for 25 minutes while heating, until the reaction is fully achieved;

[0043] S11: The chlorinated paraffin that has fully reacted with the stabilizer is pumped into the packaging equipment through a material pump. The packaging equipment washes the chlorinated paraffin under reduced pressure and dehydrates it to a water content of ≤2% to obtain a finished product.

[0044] Example 2

[0045] See also Figure 1-3 The present invention provides the following technical solution: A chlorinated paraffin production process for improving raw material utilization, comprising the following steps:

[0046] S1: Purchase high-quality liquid paraffin, liquid chlorine, pH regulator and stabilizer, and store them in A liquid paraffin tank, liquid chlorine tank, regulator tank and stabilizer tank respectively for standby use;

[0047] S2: The liquid paraffin is settled and stratified in the A liquid paraffin tank, and the liquid paraffin with a moisture content of ≤0.015% after the settlement and stratification is pumped into the B liquid paraffin tank for storage and standby use by the A liquid paraffin pump;

[0048] S3: The liquid paraffin in the B liquid paraffin tank is pumped to a 90°C constant temperature preheating tank for preheating by means of the B liquid paraffin pump;

[0049] S4: The preheated liquid paraffin in the constant temperature preheating tank is pumped into the metering tank by the C liquid paraffin pump for standby use;

[0050] S5: liquid paraffin is passed into the spray plate of the chlorination reactor through the metering tank of the metering tank, and the liquid paraffin falls into the chlorination reactor through the spray head of the spray plate, the fluorescent lamp and cooling water of the chlorination reactor are turned on, the temperature of the chlorination reactor is kept constant at 60°C, liquid chlorine is pumped into the chlorine gasifier for gasification through a liquid chlorine pump, chlorine is passed into the spray pipe of the chlorination reactor through the gasification tank of the chlorine gasifier at a pressure of 0.20Mpa, chlorine enters from bottom to top through the spray head of the spray pipe, and liquid paraffin and chlorine react with chlorination. During the chlorination reaction, the liquid paraffin at the bottom of the chlorination reactor is pumped into the spray plate by the D liquid paraffin pump for spraying, and continuously contacts and reacts with chlorine. The relative density and chlorine content of the chlorinated paraffin in the chlorine reactor are checked. When the required chlorine content is reached, the chlorine is stopped, and the fluorescent lamp and cooling water are turned off;

[0051] S6: The HCL and CL2 mixed gas generated during the reaction is pumped into the aqueous solution tank through a purification pump, the HCL gas dissolves in water to generate hydrochloric acid, the CL2 gas dissolves in water to generate hydrochloric acid and hypochlorous acid, and the hypochlorous acid decomposes to generate hydrochloric acid and oxygen;

[0052] S7: Pump oxygen into the oxygen tank for storage through oxygen pump A;

[0053] S8: pumping the hydrochloric acid solution into a hydrochloric acid tank for storage through a hydrochloric acid pump;

[0054] S9: The reacted chlorinated paraffin is pumped into the degassing reactor by the wax pump A, and oxygen is pumped into the degassing reactor by the oxygen pump B. The oxygen blows the chlorinated paraffin to remove the hydrogen chloride gas on the surface of the chlorinated paraffin. The blown hydrogen chloride gas is pumped into the aqueous solution tank by the purification pump for reaction generation;

[0055] S10: pumping the degassed chlorinated paraffin into the reactor through the B wax pump, pumping the pH regulator in the regulator tank into the reactor through the regulator pump, stirring at a stirring speed of 500 r / min for 10 min while heating, so that the pH regulator and the chlorinated paraffin fully react and are neutralized to pH 7, pumping the stabilizer in the stabilizer tank into the reactor through the stabilizer pump, stirring at a stirring speed of 500 r / min for 10 min while heating, until the reaction is fully achieved;

[0056] S11: The chlorinated paraffin that has fully reacted with the stabilizer is pumped into the packaging equipment through a material pump. The packaging equipment washes the chlorinated paraffin under reduced pressure and dehydrates it to a water content of ≤2% to obtain a finished product.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chlorinated paraffin production process for improving raw material utilization, characterized in that: The following steps are involved: S1: Purchase high-quality liquid paraffin, liquid chlorine, pH regulator and stabilizer, and store them in A liquid paraffin tank, liquid chlorine tank, regulator tank and stabilizer tank respectively for standby use; S2: The liquid paraffin is settled and stratified in the A liquid paraffin tank, and the liquid paraffin after the settlement and stratification is pumped into the B liquid paraffin tank by the A liquid paraffin pump for storage and standby use; S3: The liquid paraffin in the B liquid paraffin tank is pumped into the constant temperature preheating tank for preheating by the B liquid paraffin pump; S4: The preheated liquid paraffin in the constant temperature preheating tank is pumped into the metering tank by the C liquid paraffin pump for standby use; S5: liquid paraffin is introduced into the spray plate of the chlorination reactor through the metering tank of the metering tank, and the liquid paraffin is sprayed into the chlorination reactor through the spray head of the spray plate, the fluorescent lamp and cooling water of the chlorination reactor are turned on to make the temperature of the chlorination reactor constant, the liquid chlorine is pumped into the chlorine gasifier for gasification through the liquid chlorine pump, and the chlorine is introduced into the spray pipe of the chlorination reactor through the gasification tank of the chlorine gasifier, and the chlorine enters from bottom to top through the spray head of the spray pipe, and the liquid paraffin and the chlorine react with chlorination. During the chlorination reaction, the liquid paraffin at the bottom of the chlorination reactor is pumped into the spray plate by the D liquid paraffin pump for spraying, and continuously contacts and reacts with the chlorine, and the relative density and chlorine content of the chlorinated paraffin in the chlorine reactor are checked. When the required chlorine content is reached, the chlorine is stopped, and the fluorescent lamp and cooling water are turned off; S6: The HCL and CL2 mixed gas generated during the reaction is pumped into the aqueous solution tank through a purification pump, the HCL gas dissolves in water to generate hydrochloric acid, the CL2 gas dissolves in water to generate hydrochloric acid and hypochlorous acid, and the hypochlorous acid decomposes to generate hydrochloric acid and oxygen; S7: Pump oxygen into an oxygen tank for storage through oxygen pump A; S8: pumping the hydrochloric acid solution into a hydrochloric acid tank for storage through a hydrochloric acid pump; S9: The reacted chlorinated paraffin is pumped into the degassing reactor by the wax pump A, and oxygen is pumped into the degassing reactor by the oxygen pump B. The oxygen blows the chlorinated paraffin to remove the hydrogen chloride gas on the surface of the chlorinated paraffin. The blown hydrogen chloride gas is pumped into the aqueous solution tank by the purification pump for reaction generation; S10: pumping the degassed chlorinated paraffin into the reactor through the B wax pump, pumping the pH regulator in the regulator tank into the reactor through the regulator pump, heating and stirring, allowing the pH regulator to fully react with the chlorinated paraffin to neutralize the pH, pumping the stabilizer in the stabilizer tank into the reactor through the stabilizer pump, heating and stirring, until the reaction is fully completed; S11: The chlorinated paraffin that has fully reacted with the stabilizer is pumped into the packaging equipment through a material pump. The packaging equipment washes the chlorinated paraffin under reduced pressure and dehydrates it to a water content of ≤2% to obtain a finished product.

2. A chlorinated paraffin production process for improving raw material utilization according to claim 1, characterized in that: In the step S2, the water content of the liquid paraffin after sedimentation and stratification is ≤0.015%.

3. A chlorinated paraffin production process for improving raw material utilization according to claim 1, characterized in that: In step S3, the constant temperature range of the constant temperature preheating tank is 80-90°C.

4. A chlorinated paraffin production process for improving raw material utilization according to claim 1, characterized in that: In step S5, the constant temperature range of the chlorination reactor is 40-60°C.

5. A chlorinated paraffin production process for improving raw material utilization according to claim 1, characterized in that: In step S5, the chlorine gas introduction pressure value of the chlorine gasifier is 0.10-0.20Mpa.

6. A chlorinated paraffin production process for improving raw material utilization according to claim 1, characterized in that: In the step S10, the stirring speed is 300-500 r / min, and the stirring time is 10-25 min.

7. A chlorinated paraffin production process for improving raw material utilization according to claim 1, characterized in that: In step S10, the neutralization value of pH is between 6 and 7.

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