CN102556535A - Long-distance transportation method for chloroprene - Google Patents
Long-distance transportation method for chloroprene Download PDFInfo
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- CN102556535A CN102556535A CN2011103671466A CN201110367146A CN102556535A CN 102556535 A CN102556535 A CN 102556535A CN 2011103671466 A CN2011103671466 A CN 2011103671466A CN 201110367146 A CN201110367146 A CN 201110367146A CN 102556535 A CN102556535 A CN 102556535A
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Abstract
The invention relates to dangerous chemical storage and transportation technology, in particular to a storage and transportation method for chloroprene, which solves the problem of transportation of the chloroprene. The method includes the steps: (1) pre-treating the chloroprene by removing water, refrigerating, storing the chloroprene in dark by means of refrigeration, adding compound polymerization inhibitors and pressurizing with nitrogen; (2) loading; (3) transporting by using stainless steel storage and transportation tank trucks with jacket heat-insulation layers; (4) unloading; and (5) taking safety measures. The method with the long-distance transportation technology has the advantages that safety, stability and no deterioration of chloroprene monomers can be guaranteed during storage and long-distance transportation, material consumption of the chloroprene monomers during storage is reduced, the storage period of the chloroprene monomers is prolonged, and long-distance transportation safety of the chloroprene monomers is enhanced.
Description
Technical field
The present invention relates to a kind of dangerous chemical storaging and transport technology, be specially a kind of storage and transportation resources of chloroprene.
Background technology
Chloroprene, chemical name full name: 2-chloro-1.3-butadidenne, molecular formula: C
4H
5Cl, mol wt: 88.54, danger rule number: 31013, CAS number: 126-99-8, this product is mainly used in the production poly-chloroprene rubber.Its physical property: outward appearance is a colourless transparent liquid, and volatility is extremely strong, can be dissolved in most organic solvents, is insoluble in water.59.4 ℃ of boiling points, flash-point :-20 ℃, proportion is 0.958 under 20 ℃ of normal pressures, and acceptable concentration is 0.002 mg/litre in the air, and toxicity is medium.Its chemical property: low-flash; Inflammable, explosive liquid, chloroprene steam contact with air and promptly generate explosive mixture; Explosive Range is 4～20% (volumes); Chloroprene is easy to polymerization voluntarily, and particularly polymerization speed is faster voluntarily in the presence of the oxide of air, heat, water, iron, and to have a kind of polymer to contact with air in the poly-mer that generates be decomposition combustion, blast.Therefore; There is very large danger in the storage of chloroprene monomer; And at the long-distance transport that stores the chloroprene monomer on the basis, because of dynamic change, the vehicle that has increased external environment jolts, limited or the like the unfavorable factor of control device, be all the more dangerous multiplication.The long-distance transport technology of chloroprene monomer also is a hang-up all the time.The producer of existing domestic production chloroprene has only the long-lived chemical industry Co., Ltd of Shanxi Synihetic Rubber Group Co., Ltd. and Sichuan; The chloroprene monomer does not go out plant area basically; With producing with usefulness; All be to lean on the on-site pipeline transportation, need not long term storage yet, two families do not grasp the long-distance transport technology of chloroprene.
The prerequisite of long-distance long-time transportation is a safe storage, and at present domestic also nobody carried out the research and the practice of long preservation this respect, from some related datas, recognized, has only the long preservation technology of E.I.Du Pont Company's grasp chloroprene of the U.S. at present.But the said firm is as know-how, and never public reported is crossed the data of these aspects.But along with development of social production, inevitable requirement chloroprene long-distance transport is at a distance deposited once more to other areas and in certain time limit and is processed.Therefore long preservation technology and the long-distance transport technology of saying chloroprene belong to blank at present at home.
Summary of the invention
The present invention provides a kind of long-distance transport method of chloroprene for the transportation problem that solves chloroprene.
The present invention is realized by following technical scheme: a kind of long-distance transport method of chloroprene, and step comprises:
(1) chloroprene pre-processing; 1. remove moisture impurity: the smart chloroprene monomer liquid that rectification column is produced is through in anhydrous calcium chloride and the soda ash and drying tower; Making impurity acid and moisture be reduced to zero, is about 0 ℃ through the freezing chloroprene finished fluid temperature that makes
2. use corrosion-resistant steel storage tank lucifuge refrigerated storage: the chloroprene monomer liquid is transferred in the corrosion-resistant steel storage tank and is refrigerated to about-10 ℃,
3. got into by drying tower in the process of storage tank at chloroprene monomer, add 5/10000ths composite polymerzation inhibitor of chloroprene monomer amount, described composite polymerzation inhibitor is 3 parts phenothiazine and 2 parts p-tert-butyl catechol,
4. feed the nitrogen pressurize, with the continuously nitrogen pressurize of the about 0.2KPa of feeding in the storagetank of nitrogen tube;
In up-to-standard chloroprene product quality indicator, vinylacetylene content's index Wei ≦ 0.2%.Vinylacetylene:
is gas at normal temperatures and pressures; 5.5 ℃ of boiling points (depressing at standard atmosphere), proportion is 0.7095 in the time of 0 ℃.During
liquid state is water white transparency, and pungency, bitter, poisonous, volatile are arranged.Airborne safe level is 0.01mg/l.3. in the fully enclosed container, when temperature build-up, pressure rises very soon, explosive.In view of the above-mentioned characteristic of vinylacetylene and to chloroprene security consideration in transit.Through measures such as cooling and inhibitings it is controlled.
(2) entrucking,
1. before the entrucking force feed pipeline is connected with the accumulating jar, force feed pipeline and transport vehicle are carried out electrostatic test;
2. open accumulating jar feed liquor valve, when an end of force feed pipeline feeds nitrogen, open accumulating jar exhaust-valve and carry out nitrogen replacement, make nitrogen air emptying in the jar;
3. after treating that nitrogen replacement is accomplished, close nitrogen valve, with mass transport to accumulating jar; When mass transport finishes; Close accumulating jar exhaust-valve; Open the fluid-tight inlet, when accumulating jar internal pressure reaches specified value, close nitrogen valve and close accumulating jar feed liquor valve simultaneously; The force feed pipeline is separated with the accumulating jar, and transfer pressure, temperature, the material reserves record of qualified list of material and accumulating jar single with giving the person of escorting goods on a train, truck, etc. with car.
(3) transportation, the corrosion-resistant steel storage tank car of use jacketed heat-insulation layer in the transportation, transport preferred night: also be provided with auxiliary device on the described storage tank car.Because therefore the particularity of chloroprene can not use conventional accumulating jar to transport.Must use the accumulating jar of jacketed heat-insulation layer for this reason.This jar of accumulating jar of jacketed heat-insulation layer meets the requirement that country's danger jar manufactures and designs, this vehicle National standard.
(4) unload, 1. transportation tank car is connected with liquid discharging tube, accumulating jar nitrogen inlet is connected with nitrogen tube; Open nitrogen valve when 2. opening the tapping of accumulating jar tap hole, the pressure that keeps the accumulating jar is in specialized range; 3. after force feed finishes, close nitrogen valve, with xylene liquid flushing accumulating jar; 4. after flushing finishes, close accumulating jar feed liquor valve, open nitrogen valve and treat nitrogen replacement number minute, treat to close when accumulating jar internal pressure reaches authorized pressure nitrogen valve.All also will sneak into minor N O in the used nitrogen during whole the unloading, the purpose of using NO is to eliminate airborne oxygen.
(5) security insurance: in transportation, join an emergency guarantee car colleague simultaneously, emergent fire fighting apparatus and materials is arranged on the emergency guarantee vehicle, regularly accumulating jar internal pressure, temperature are checked in transit.Purpose is for to the unforeseen circumstances that possibly occur in the transportation, has formulated emergency preplan, guarantees the safety of chloroprene in transportation.
Technical scheme according to the invention comprises activity inhibition technology, transportation anoxybiotic resist technology, process safety custody technology, the safe and reliable technology of unloading and the protection Removal Technology of transporting tank car of this kind chemical to the adverse reaction of chloroprene monomer under the condition of the oxide of air, heat, illumination, water, iron.Make different corresponding countrmeasures from above various aspects; These several kinds conditions that the harm factor produces have been eliminated; Reduce its material loss and dangerous factor that takes place in storage and transportation; Thereby guaranteed the permanence of safe storage time and the continuity and the stability of production, and adorned, transported, unload process safety, stable, continuous target in the chloroprene long-distance transport process, for being that the diversification of raw material is produced and created advantageous conditions with the chloroprene monomer.
The beneficial effect of long-distance transport of the present invention technology: guarantee the chloroprene monomer store and the long-distance transport process in can be safely, stablize, never degenerate; Reduce the material loss of chloroprene monomer in storage process, increase the shelf life and remote safety of carrying of chloroprene monomer.Solved my company's Central Asia joint venture bottleneck problem in the process that goes into trial production.
Description of drawings
Fig. 1 is a storing technology technology scheme circuit
Fig. 2 is the tank car and the accessory equipment scheme drawing of chloroprene
Among the figure: add inlet, 5-nitrogen pressurize admission port, 6-storage tank, 7-fluid-tight, 8-emptying, 9-car body, 10-tank body with drying tower, 2-liquid receiving port, 3-soda ash or anhydrous calcium chloride, 4-stabilizer among the 1-.
The specific embodiment
Embodiment 1, the long-distance transport method of chloroprene, and step comprises:
(1) 1. the preparatory preservation of chloroprene monomer, the measure of taking are, remove moisture impurity: the smart chloroprene monomer liquid that rectification column is produced is built-in with anhydrous calcium chloride (CaCl from body of the tower
2) and soda ash (Na
2CO
3) in flow into drying tower bottom; Material gets into the outlet of leading to chloroprene monomer storage tank that has filtering net on top through anhydrous calcium chloride and soda ash; The dry body of the tower that neutralizes simultaneously can drop to the temperature of chloroprene monomer about 0 ℃ with-15 ℃ of chilled brine chuck heat-insulation layers.
The polymeric generation of chloroprene can brought out and promote to the existence of moisture, prepares in the process at the chloroprene monomer, usually has a spot of acid and moisture in the smart chloroprene monomer of being produced by rectification column, and these sour waters are through placing anhydrous calcium chloride (CaCl
2) and soda ash (Na
2CO
3) in and drying tower, in drying tower in wherein anhydrous calcium chloride be used for absorbing the moisture in the chloroprene, during soda ash is used for material in sour water, guaranteeing does not have moisture before chloroprene gets into storage tank.
2. use corrosion-resistant steel storage tank lucifuge refrigerated storage: the chloroprene monomer liquid is refrigerated to about-10 ℃.We store the chloroprene monomer through-15 ℃ of chilled brine chuck heat-insulation layer corrosion-resistant steel storage tanks that have that use totally-enclosed lucifuge; Chloroprene finished fluid temperature is reduced to about-10 ℃ by original 0 ℃.
Temperature plays considerable effect in the chloroprene storage process, in up-to-standard chloroprene product quality indicator, and vinylacetylene content's index Wei ≦ 0.2%.Vinylacetylene:
is gas at normal temperatures and pressures; 5.5 ℃ of boiling points (depressing at standard atmosphere), proportion is 0.7095 in the time of 0 ℃.During
liquid state is water white transparency, and pungency, bitter, poisonous, volatile are arranged.Airborne safe level is 0.01mg/l.3. in the fully enclosed container, when temperature build-up, pressure rises very soon, explosive.So, temperature high-vinyl acetylene and chloroprene volatilize easily on the one hand, are prone to give birth to dangerous; Temperature is high more in the identical time on the other hand; Chloroprene voluntarily polymerization speed to generate the polymerization scale of construction more soon many more, the respective reaction release heat is also many more, promotes the generation of first aspect hidden danger all the more.
In view of above-mentioned vinylacetylene characteristic and to the consideration of chloroprene storage safe.We make chloroprene finished fluid temperature reduce to about-10 ℃ by original 0 ℃ through the accumulator tank that has-15 ℃ of chilled brine chuck heat-insulation layers that uses lucifuge, thus effectively avoided chloroprene in storage process since the insecurity that the vinylacetylene volatilization causes with suppress the polymeric generation of chloroprene.
Accelerate because the chloroprene monomer contacts polymerization speed with the oxide of iron, contact with the oxide of iron for fear of it, we replace traditional carbon steel storage tank with the corrosion-resistant steel storage tank, thereby reduce the polymeric growing amount of chloroprene.
3. get in the process of storage tank every composite polymerzation inhibitor of 5/10000ths that flows into storage tank chloroprene monomer amount half an hour that adds through chloroprene storage tank feed pipe at a distance from half an hour by drying tower at chloroprene monomer.
4. feed the nitrogen pressurize: with the continuously nitrogen pressurize of the about 0.2KPa of feeding in the storagetank of nitrogen tube.
Because the vinylacetylene volatile matter contacts easily with air and blasts in the stock solution; Simultaneously chloroprene contacts with air and more easily polymerization takes place and go bad; For the safety of storing and stability we with nitrogen tube continuously in the storagetank feeding nitrogen reach about 0.2KPa and pressurize; Make to store to keep the pure nitrogen gas environment in the cell body, avoid the direct contact of stock solution and air, thereby assurance stock solution safety, stablize, never degenerate.
(2), entrucking,
1. before the entrucking force feed pipeline is connected with the accumulating jar, force feed pipeline and transport vehicle are carried out electrostatic test;
2. open accumulating jar feed liquor valve, when an end of force feed pipeline feeds nitrogen, open accumulating jar exhaust-valve (keeping pressure) and carry out nitrogen replacement a little more than barometric pressure 0.1-0.3kpa;
3. after treating nitrogen replacement number minute, nitrogen is full of in the tank body fully, closes nitrogen valve, with mass transport to accumulating jar; When mass transport finishes; Close accumulating jar exhaust-valve; Open fluid-tight admission port (the each entrucking as prescribed inspection of fluid-tight liquid level), when accumulating jar internal pressure reaches specified value, close nitrogen valve and close accumulating jar feed liquor valve simultaneously; The force feed pipeline is separated with the accumulating jar, and transfer pressure, temperature, the material reserves record of qualified list of material and accumulating jar single with giving the person of escorting goods on a train, truck, etc. with car.
(3), use the storage tank car of jacketed heat-insulation layer in the transportation: also be provided with auxiliary device on the described storage tank car.Auxiliary device is fluid-tight, evacuated tube, and pressure gauge, exhaust-valve, flame trap are housed on the pipeline; Operable transportation tank body has two kinds: a kind of is the enamel pipe of cover in the band; Another kind is the stainless cylinder of steel of band insulation, the performance requriements of heat-insulation layer, and 8 hours the temperature difference is 1 ℃; Tank interior does not have the dead angle as far as possible, requires weld bond to do polishing and handles.The transportation speed of a motor vehicle is prone to be difficult for slowly fast, reduces as far as possible and jolts.
(4), unload;
1. transportation tank car is connected with liquid discharging tube, accumulating jar nitrogen inlet is connected with nitrogen tube;
Open nitrogen valve when 2. opening the tapping of accumulating jar tap hole, the pressure that keeps the accumulating jar is in specialized range;
3. after force feed finishes, close nitrogen valve, with xylene liquid flushing accumulating jar;
4. after flushing finishes, close accumulating jar feed liquor valve, after opening nitrogen valve and treating nitrogen replacement number minute, treat to close when accumulating jar internal pressure reaches authorized pressure nitrogen valve.
To in nitrogen, sneak into minor N O when using nitrogen during whole the unloading, millesimal volume for example, the purpose of using NO is to eliminate the hoot oxygen that maybe might exist in the long-distance transportation back tank body that jolts, make and recover anaerobic state in the tank body.
(5), security insurance: in transportation, join an emergency guarantee car colleague simultaneously, emergent fire fighting apparatus and materials is arranged on the emergency guarantee vehicle, regularly accumulating jar internal pressure, temperature are checked in transit.
The mountain of the joint construction of Shanxi Synihetic Rubber Group Co., Ltd. and Armenian Na Yilite company is received company and will be built up the end of the year 2009; According to the requirement of chemical industry test run, need receive company to the chloroprene long-distance transport that old factory produces to the mountain and carry out polymerization and produce as a trial.
Rubber receives roping since on December 22nd, 2009 toward the mountain from the mountain for effect, chloroprene, and April 30 in 2010, end of day lasted 5 months, and the time average of each roping is 2 hours, and the amount of roping is about 10m
3About.Nearly 900 tons of the amount of accumulative total roping chloroprene does not have any accident and takes place with unexpected.
Instance one: with removing the monomer of impurity acid with moisture after the rectifying, the tank car of under the nitrogen pressure of 0.1-0.3kpa, packing into is during entrucking: 10 tons of amount of monomer, temperature-9 ℃, adding composite polymerzation inhibitor 5Kg; The transportation speed of a motor vehicle＜70km/h; Tank car temperature fluctuation range :-9～-8 ℃; Fluctuation of pressure scope: 8kPa～10 kPa, haulage time 1 hour 45 minutes.Before the transportation with to have transported after the rectifying index of quality of monomer following:
Instance two: with removing the monomer of impurity acid with moisture after the rectifying, the tank car of under the nitrogen pressure of 0.1-0.3kpa, packing into is during entrucking: 12 tons of amount of monomer, temperature-8 ℃, adding composite polymerzation inhibitor 6Kg; The transportation speed of a motor vehicle＜70km/h; Tank car temperature fluctuation range :-8 ℃～-7 ℃; Fluctuation of pressure scope: 8kPa～12 kPa, haulage time 1 hour 55 minutes.Before the transportation with to have transported after the rectifying index of quality of monomer following:
Instance three: with removing the monomer of impurity acid with moisture after the rectifying, the tank car of under the nitrogen pressure of 0.1-0.3kpa, packing into is during entrucking: 15 tons of amount of monomer, temperature-10 ℃, adding composite polymerzation inhibitor 7.5Kg; The transportation speed of a motor vehicle＜70km/h; Tank car temperature fluctuation range :-10 ℃～-8 ℃; Fluctuation of pressure scope: 9kPa～12 kPa, haulage time 2 hours 10 minutes.Before the transportation with to have transported after the rectifying index of quality of monomer following:
Instance four: with removing the monomer of impurity acid with moisture after the rectifying, the tank car of under the nitrogen pressure of 0.1-0.3kpa, packing into is during entrucking: 10 tons of amount of monomer, temperature-7 ℃, adding composite polymerzation inhibitor 5Kg; The transportation speed of a motor vehicle＜70km/h; Tank car temperature fluctuation range :-7 ℃～-6 ℃; Fluctuation of pressure scope: 9kPa～14 kPa, haulage time 1 hour 30 minutes.Before the transportation with to have transported after the rectifying index of quality of monomer following:
Instance five: with removing the monomer of impurity acid with moisture after the rectifying, the tank car of under the nitrogen pressure of 0.1-0.3kpa, packing into is during entrucking: 15 tons of amount of monomer, temperature-9 ℃, adding composite polymerzation inhibitor 7.5Kg; The transportation speed of a motor vehicle＜70km/h; Tank car temperature fluctuation range :-9 ℃～-7 ℃; Fluctuation of pressure scope: 9kPa～13 kPa, haulage time 2 hours 05 minute.Before the transportation with to have transported after the rectifying index of quality of monomer following:
Claims (2)
1. the long-distance transport method of a chloroprene is characterized in that: step comprises,
1., remove moisture impurity (1) pretreatment of chloroprene monomer: the smart chloroprene monomer liquid that rectification column is produced is built-in with anhydrous calcium chloride (CaCl from body of the tower
2) and soda ash (Na
2CO
3) in flow into drying tower bottom, the outlet of leading to chloroprene monomer storage tank that has filtering net that material gets into top through anhydrous calcium chloride and soda ash, simultaneously in and drying tower the temperature of chloroprene monomer is dropped to about 0 ℃,
2. use corrosion-resistant steel storage tank lucifuge refrigerated storage: the chloroprene monomer liquid is transferred in the corrosion-resistant steel storage tank and is refrigerated to about-10 ℃,
3. get into by drying tower in the process of storage tank at chloroprene monomer, add 5/10000ths composite polymerzation inhibitor of chloroprene monomer amount,
4. feed the nitrogen pressurize, with the continuously nitrogen pressurize of the about 0.2KPa of feeding in the storagetank of nitrogen tube;
(2) 1. entrucking is connected the force feed pipeline before the entrucking with the accumulating jar, force feed pipeline and transport vehicle are carried out electrostatic test; 2. open accumulating jar feed liquor valve, when an end of force feed pipeline feeds nitrogen, open accumulating jar exhaust-valve and carry out nitrogen replacement; 3. after treating that nitrogen replacement finishes, close nitrogen valve, with mass transport to accumulating jar; When mass transport finishes; Close accumulating jar exhaust-valve; Open the fluid-tight inlet, when accumulating jar internal pressure reaches specified value, close nitrogen valve and close accumulating jar feed liquor valve simultaneously; The force feed pipeline is separated with the accumulating jar, and transfer pressure, temperature, the material reserves record of qualified list of material and accumulating jar single with giving the person of escorting goods on a train, truck, etc. with car; Transportation will be monitored the pressure of the temperature and the nitrogen envelope of groove jar, prevents that nitrogen from leaking and temperature build-up;
(3) storage tank car of use jacketed heat-insulation layer in the transportation: also be provided with auxiliary device on the described storage tank car;
(4) unload, 1. transportation tank car is connected with liquid discharging tube, accumulating jar nitrogen inlet is connected with nitrogen tube; Open nitrogen valve when 2. opening the tapping of accumulating jar tap hole, the pressure that keeps the accumulating jar is in specialized range; 3. after force feed finishes, close nitrogen valve, with xylene liquid flushing accumulating jar; 4. after flushing finishes, close accumulating jar feed liquor valve, open nitrogen valve and treat nitrogen replacement, treat to close when accumulating jar internal pressure reaches authorized pressure nitrogen valve;
(5) security insurance: in transportation, join an emergency guarantee car colleague simultaneously, emergent fire fighting apparatus and materials is arranged on the emergency guarantee vehicle, regularly accumulating jar internal pressure, temperature are checked in transit.
2. the long-distance transport method of chloroprene according to claim 1, it is characterized in that: composite polymerzation inhibitor is 3 parts phenothiazine and 2 parts p-tert-butyl catechol.
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Cited By (1)
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| CN108358151A (en) * | 2018-04-23 | 2018-08-03 | 中国化学赛鼎宁波工程有限公司 | A kind of factory monitors with ethylene oxide, storage, recycling and handling system |
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