CN102536779B - Processing method for preventing seal leakage of circulating pump and purification method of biodiesel - Google Patents
Processing method for preventing seal leakage of circulating pump and purification method of biodiesel Download PDFInfo
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- CN102536779B CN102536779B CN201110183667.6A CN201110183667A CN102536779B CN 102536779 B CN102536779 B CN 102536779B CN 201110183667 A CN201110183667 A CN 201110183667A CN 102536779 B CN102536779 B CN 102536779B
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- carbonaceous particles
- tower
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- 239000003225 biodiesel Substances 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000000746 purification Methods 0.000 title claims abstract description 13
- 238000003672 processing method Methods 0.000 title abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004939 coking Methods 0.000 claims abstract description 8
- 239000000084 colloidal system Substances 0.000 claims abstract description 8
- 150000002148 esters Chemical class 0.000 claims abstract description 8
- 238000011010 flushing procedure Methods 0.000 claims description 62
- 239000004519 grease Substances 0.000 claims description 55
- 238000000605 extraction Methods 0.000 claims description 27
- 238000007701 flash-distillation Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000002283 diesel fuel Substances 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 125000004185 ester group Chemical group 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 28
- 238000007789 sealing Methods 0.000 description 21
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 235000019198 oils Nutrition 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- ZXEKIIBDNHEJCQ-UHFFFAOYSA-N isobutanol Chemical compound CC(C)CO ZXEKIIBDNHEJCQ-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- MLBYBBUZURKHAW-UHFFFAOYSA-N 4-epi-Palustrinsaeure Natural products CC12CCCC(C)(C(O)=O)C1CCC1=C2CCC(C(C)C)=C1 MLBYBBUZURKHAW-UHFFFAOYSA-N 0.000 description 1
- 241001048891 Jatropha curcas Species 0.000 description 1
- MLBYBBUZURKHAW-MISYRCLQSA-N Palustric acid Chemical compound C([C@@]12C)CC[C@@](C)(C(O)=O)[C@@H]1CCC1=C2CCC(C(C)C)=C1 MLBYBBUZURKHAW-MISYRCLQSA-N 0.000 description 1
- 239000008162 cooking oil Substances 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention provides a processing method for preventing seal leakage of circulating pump and a purification method of biodiesel. The processing method comprises the step of washing the mechanical seal cavity of the circulating pump using the biodiesel, wherein carbonaceous particles attached to the mechanical seal cavity are peeled off under such washing condition, and the biodiesel liquid flow containing the carbonaceous particles is exported out; the carbonaceous particles are carbon deposit and colloid produced by high-temperature carbonization and coking of C19-C40 esters. With the adoption of the method provided by the invention, not only can the probability of seal leakage of the circulating pump be reduced, but also the purpose of producing biodiesel efficiently and continuously can be reached.
Description
Technical field
The present invention relates to a kind of processing method of circulating pump sealing leakage and process for purification of biodiesel of preventing.
Background technique
In the production process of biodiesel, particularly adopt in the process of SRCA explained hereafter biodiesel, conventionally need to experience the unit operation such as refining of recovery, the biodiesel product of esterification, the low-carbon alcohols of feedstock oil and low-carbon alcohols.Wherein, in the refined unit of described biodiesel product, in order to allow biodiesel gasification temperature reduce, in the time of flash separation, conventionally adopt lower than the high vacuum operational condition of 1KPaA (absolute pressure) and the flash temperature of 255 DEG C-280 DEG C, and adopt recycle pump pump circulation heat-obtaining in the bottom of refiner.; the circulatory mediator entrance of recycle pump is connected with the tower reactor of high vacuum flash tower by pipeline; circulatory mediator outlet is connected with heater by pipeline; by recycle pump, a part of heavy grease is drawn from tower reactor; and after heater via heating; heavy grease is returned in high vacuum flash tower, thereby reach the object of circulation heat-obtaining.In this process, described heavy grease has part and infiltrates in the mechanical seal chamber of recycle pump, in order to ensure the normal operation of recycle pump,, the flushing medium entrance and the flushing medium outlet that prevent mechanical seal chamber are stopped up or wearing and tearing, can normally rinse described Seal cage, make Seal cage in clean conditions, ensure not leak outside, prior art is rinsed mechanical seal chamber using heavy grease as flushing medium conventionally.But, at high temperature easily there is polymerization carbonization in heavy grease, therefore, while adopting heavy grease as flushing medium, along with the increase of pump operation time, mechanical seal chamber, flushing medium entrance, the carbonaceous particles that flushing medium outlet bonding stockpiles is also being on the increase, the solid of the elastic element surface bonding carbon containing of the inside, mechanical seal chamber of mechanical seal device, easy initiation elastic element is stuck or elastic force is inhomogeneous, sealing surface compact power deficiency between elastic element, when serious, carbonaceous solid particulates enters sealing surface, cause the wearing and tearing of sealing surface, and then the risk that causes heavy grease to leak.If stopped up flushing medium entrance and/or outlet, in Seal cage, accumulate a large amount of carbonaceous particles, will cause sealing surface temperature to rise rapidly and scaling loss.
Summary of the invention
The object of the invention is for existing rinse described mechanical seal chamber during using heavy grease as flushing medium, the defect of the risk that heavy grease reveals easily occurs, a kind of processing method that circulating pump sealing leaks and process for purification of biodiesel of preventing is provided.Adopt processing method provided by the invention, not only can reduce the probability that circulating pump sealing is revealed, can also reach object efficient, continuous production of biodiesel.
The invention provides a kind of processing method that prevents that circulating pump sealing from leaking, wherein, described method comprises the mechanical seal chamber of rinsing described recycle pump by biodiesel, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and the biodiesel liquid stream that contains carbonaceous particles is drawn; Described carbonaceous particles is C
19-C
40the carbon distribution that ester class produces through high temperature cabonization coking and colloid.
The present inventor finds, at the temperature of 255 DEG C-280 DEG C, heavy grease has part and is carbonized, along with the increase of pump operating cycle time, the carbon granule accumulating in mechanical seal chamber, flushing medium entrance and flushing medium outlet also can increase gradually, these carbon granules not only can cause the obstruction of pump housing flushing medium entrance and flushing medium outlet, and also easy risk of wearing and tearing mechanical seal and cause heavy grease to reveal, has increased maintenance cost.The present inventor is surprised to find that, biodiesel has higher boiling point, while rinsing described mechanical seal chamber, is not easy gasification volatilization, thereby has good developing result as flushing medium; What is more important, the viscosity of described biodiesel is lower, at high temperature can carbonization not generate carbonaceous particles, while using biodiesel to rinse described mechanical seal chamber, can easily carbonaceous particles residual in Seal cage be taken out of, thereby make recycle pump energy long-term operation, reduced its maintenance cost, eliminated the danger that heavy grease leaks.
In addition, the present invention also provides a kind of process for purification of biodiesel, and the method comprises to be sent into biodiesel coarse product in flash tower and carry out flash distillation, and the condition of described flash distillation makes biodiesel from overhead extraction, and heavy grease is from extraction at the bottom of tower; Adopt recycle pump by part heavy grease from extraction at the bottom of tower, and return in flash tower after heating, wherein, the method also comprises and will introduce recycle pump from overhead extraction part biological diesel oil and rinse the mechanical seal chamber of described recycle pump, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and the biodiesel liquid stream that contains carbonaceous particles is drawn; Described carbonaceous particles is C
19-C
40the carbon distribution that ester class produces through high temperature cabonization coking and colloid.
The processing method that prevents that circulating pump sealing from leaking provided by the invention is simple, only by change flushing medium can ensure described recycle pump safe, steadily and in long-term operation, the maintenance cost of reduction recycle pump.In addition, the present invention adopts the recycle pump circulation heat-obtaining that seal leakage probability is little to refine biodiesel crude product, has also greatly improved the manufacturing efficiency of biodiesel and has saved cost.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
According to the present invention, the described processing method that prevents that circulating pump sealing from leaking comprises the mechanical seal chamber of rinsing described recycle pump by biodiesel, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and the biodiesel liquid stream that contains carbonaceous particles is drawn; Described carbonaceous particles is C
19-C
40the carbon distribution that ester class produces through high temperature cabonization coking and colloid.
Well known to a person skilled in the art to be, the main component of described biodiesel is C
12-C
18fatty-acid monoester; The main component of described heavy grease is C
19-C
40ester.
According to the present invention, described C
19-C
40the carbon distribution that ester class produces through high temperature cabonization coking and colloid come from the existing the whole bag of tricks of employing and prepare the C producing in biodiesel process
19-C
40carbon distribution and colloid that ester type high temp carbonization coking produces.Described biodiesel boiling point is higher, be difficult for gasification volatilization and be difficult for carbonization, while rinsing the mechanical seal chamber of described recycle pump by biodiesel, can easily residual carbonaceous particles in described mechanical seal chamber be peeled off and be taken out of with biodiesel liquid stream, thereby mechanical seal chamber, flushing medium entrance and flushing medium are exported all the time in clean conditions, extend the working life of recycle pump, reduce its maintenance cost.
According to the present invention, the various recycle pumps of described recycle pump can be known to the skilled person various heat-obtainings that are applicable to circulate in biodiesel refining process, its mechanical realization and working principle are conventionally known to one of skill in the art.For example, described recycle pump comprises motor, impeller, circulatory mediator entrance and circulatory mediator outlet, forms negative pressure the circulatory mediator being entered by circulatory mediator entrance is sucked and draw from circulatory mediator outlet by the rotation of impeller; Described recycle pump is also provided with mechanical seal device, this mechanical seal device comprises mechanical seal chamber, described mechanical seal chamber comprises flushing medium entrance and flushing medium outlet, and flushing medium enters and rinse Seal cage by flushing medium entrance, discharges from flushing medium outlet.
According to the present invention, the method for utilizing biodiesel to rinse the mechanical seal chamber of recycle pump is not particularly limited, as long as can ensure, residual carbonaceous particles in described mechanical seal chamber is taken out of; Under preferable case, the mode of described flushing can be for introducing described biodiesel in mechanical seal chamber by flushing medium entrance and rinse described mechanical seal chamber, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and is exported the biodiesel liquid stream that contains carbonaceous particles is drawn by flushing medium.
The present invention is not particularly limited the condition of described flushing, as long as can ensure, residual carbonaceous particles in described mechanical seal chamber is taken out of.Generally, the condition of described flushing comprises the flow velocity that rinses temperature and flushing medium; The temperature of described flushing can change within a large range, and for example, the temperature of described flushing can be higher than 120 DEG C, remove the combined factors such as effect and efficiency of carbonaceous particles consider from further raising, and the temperature of preferred described flushing is 90-110 DEG C; The flow velocity of described biodiesel also can in very large range change, can strengthen the flushing ability to carbonaceous particles owing to improving the flow velocity of described biodiesel in Seal cage, but cause too greatly equipment overload operation for fear of flow velocity, and flow velocity is too little, make the impact force to being attached to the carbonaceous particles in mechanical seal chamber too low, thereby remove the effect of carbonaceous particles and the problem of decrease in efficiency, under preferable case, the flow velocity of described biodiesel can be 6-12 meter per second, more preferably 8-10 meter per second.
The present invention also provides a kind of process for purification of biodiesel, and the method comprises to be sent into biodiesel coarse product in flash tower and carry out flash distillation, and the condition of described flash distillation makes biodiesel from overhead extraction, and heavy grease is from extraction at the bottom of tower; Adopt recycle pump by part heavy grease from extraction at the bottom of tower, and return in flash tower after heating, wherein, the method also comprises and will introduce recycle pump from overhead extraction part biological diesel oil and rinse the mechanical seal chamber of described recycle pump, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and the biodiesel liquid stream that contains carbonaceous particles is drawn; Described carbonaceous particles is C
19-C
40the carbon distribution that ester class produces through high temperature cabonization coking and colloid.
Particularly, described recycle pump comprises circulatory mediator entrance, circulatory mediator outlet and mechanical seal chamber, described mechanical seal chamber comprises flushing medium entrance and flushing medium outlet, the part heavy grease of extraction at the bottom of tower is introduced by described circulatory mediator entrance, and draw from circulatory mediator outlet through described recycle pump, part biological diesel oil from overhead extraction is introduced in the mechanical seal chamber of recycle pump by flushing medium entrance and rinsed described mechanical seal chamber, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and export the biodiesel liquid stream that contains carbonaceous particles is drawn by flushing medium, and the heavy grease of drawing and the biodiesel liquid stream that contains carbonaceous particles are mixed, obtain mixture, described mixture is heated and return and in described flash tower, carry out flash distillation together with biodiesel coarse product.
In the present invention, the processing method of biodiesel can be the processing method of existing various biodiesel, and under preferable case, method of the present invention is specially adapted to by the method for SRCA explained hereafter biodiesel.Described SRCA technique refers to grease and low-carbon alcohols is passed through the technique of high temperature (260 DEG C-280 DEG C) high pressure (6-8MPa) ester exchange reaction production biodiesel, and described grease can be selected from one or more in Jatropha curcas oil, cotton seed oil, rubber oil, acidification oil, waste oil and waste cooking oil; Described low-carbon alcohols can be selected from C
1-C
8low-carbon alcohols in one or more, for example C
1-C
8monohydric alcohol, can be selected from one or more in methyl alcohol, ethanol, normal propyl alcohol, isopropanol, n-butanol and isobutanol; From price be easy to the consideration of the combined factors such as recoverys, described C
1-C
8low-carbon alcohols be generally methyl alcohol.
According to the present invention, part heavy grease is drawn from tower reactor, after heating, return to described flash tower, after mixing with the biodiesel coarse product in flash tower, can improve the temperature of described biodiesel coarse product, can reach the object of circulation heat-obtaining.The part biological diesel oil of drawing from tower top rinses described mechanical seal chamber as flushing medium, draw from flushing medium outlet, after converging with above-mentioned heavy grease, heat and return to flash tower through heater, can again reclaim described biodiesel, can not cause the waste of material.
According to the present invention, the temperature of the mixture that the heavy grease after heating or heavy grease and the biodiesel liquid that contains carbonaceous particles flow can in very large range change, as long as ensure that its temperature is more than or equal to the temperature in flash tower, thereby can reach the object of circulation heat-obtaining, for example, described temperature can be 220-280 DEG C, is preferably 250-280 DEG C.
According to the present invention, the condition of described flushing is identical with the washing condition of the above-mentioned processing method that prevents circulating pump sealing leakage, will repeat no more at this.
According to the present invention, it is conventionally known to one of skill in the art that biodiesel coarse product is sent into the condition of carrying out flash distillation in flash tower, as long as make biodiesel from overhead extraction, heavy grease is from extraction at the bottom of tower, so that the biodiesel in biodiesel coarse product is separated with heavy grease.For example, the pressure of flash distillation can be 0.65-1.5KPaA (absolute pressure); The temperature of flash distillation can be 240-280 DEG C.
The present invention is further illustrated for following embodiment, but therefore do not limit the present invention.
Biodiesel coarse product in embodiment and comparative example is the thick product by SRCA method production biodiesel gained, be specially: in autoclave, be to add palustric acid carburetion (being purchased from Fujian Zhong Min Chemical Co., Ltd.) and methyl alcohol at 9: 1 in molar ratio, after 2 hours, obtain the product containing biodiesel in the lower reaction of 260 DEG C, 6.5MPa (gauge pressure).By the product containing biodiesel of gained, through methyl alcohol, distillation removes after most of methyl alcohol, after washing in water scrubber, washing product is passed in de-light component flash tower, under 210 DEG C, 20KPaA (absolute pressure), carry out flash distillation, at the bottom of tower, obtain biodiesel coarse product, described biodiesel coarse product is the mixture of biodiesel and heavy grease.
Embodiment 1
The present embodiment is for illustrating the processing method of circulating pump sealing leakage and the process for purification of biodiesel of preventing provided by the invention.
Biodiesel coarse product obtained above is joined in flash tower, is that 280 DEG C, pressure are to carry out flash distillation under 0.65KPaA (absolute pressure) in temperature, and biodiesel is from overhead extraction, and heavy grease is from extraction at the bottom of tower.At the bottom of tower, draw the heavy grease that flow is 60t/h, this part heavy grease recycle pump of flowing through, then send back in flash tower after being heated to 280 DEG C by heater, carry out distilation together with biodiesel coarse product.Meanwhile, from tower top extension biodiesel, be cooled to after 110 DEG C through cooler, flushing medium entrance from the mechanical seal chamber of recycle pump is introduced, to rinse this mechanical seal chamber, the carbonaceous particles being attached in mechanical seal chamber is peeled off, and this biodiesel that contains carbonaceous particles is drawn from flushing medium outlet, converge rear heating (280 DEG C) and return to described flash tower with above-mentioned heavy grease and carry out flash distillation together with biodiesel coarse product, the amount of the part biological diesel oil of drawing from tower top is as the criterion as 8 meter per seconds to ensure its flow velocity in mechanical seal chamber.Adopt method of the present invention can effectively prevent the leakage of circulating pump sealing, this recycle pump can continuous service 1 year and is not leaked outside.
Embodiment 2
The present embodiment is for illustrating the process for purification of biodiesel provided by the invention.
Biodiesel coarse product obtained above is joined in flash tower, is that 280 DEG C, pressure are to carry out flash distillation under 0.65KPaA (absolute pressure) in temperature, and biodiesel is from overhead extraction, and heavy grease is from extraction at the bottom of tower.At the bottom of tower, draw the heavy grease that flow is 60t/h, this part heavy grease recycle pump of flowing through, then send back in flash tower after being heated to 280 DEG C by heater, carry out distilation together with biodiesel coarse product.Meanwhile, from tower top extension biodiesel, be cooled to after 90 DEG C through cooler, flushing medium entrance from the mechanical seal chamber of recycle pump is introduced, to rinse this mechanical seal chamber, carbonaceous particles is taken out of, and this biodiesel that contains carbonaceous particles is drawn from flushing medium outlet, converge rear heating (280 DEG C) and return to described flash tower with above-mentioned heavy grease and carry out flash distillation together with biodiesel coarse product, the amount of the part biological diesel oil of drawing from tower top is as the criterion as 10 meter per seconds to ensure its flow velocity in mechanical seal chamber.Adopt method of the present invention can effectively prevent the leakage of circulating pump sealing, this recycle pump can continuous service 11 months and is not leaked outside.
Embodiment 3
The present embodiment is for illustrating the process for purification of biodiesel provided by the invention.
Biodiesel coarse product obtained above is joined in flash tower, is that 280 DEG C, pressure are to carry out flash distillation under 0.65KPaA (absolute pressure) in temperature, and biodiesel is from overhead extraction, and heavy grease is from extraction at the bottom of tower.At the bottom of tower, draw the heavy grease that flow is 60t/h, this part heavy grease recycle pump of flowing through, then send back in flash tower after being heated to 280 DEG C by heater, carry out distilation together with biodiesel coarse product.Meanwhile, from tower top extension biodiesel, be cooled to after 100 DEG C through cooler, flushing medium entrance from the mechanical seal chamber of recycle pump is introduced, to rinse this mechanical seal chamber, the carbonaceous particles being attached in mechanical seal chamber is peeled off, and this biodiesel that contains carbonaceous particles is drawn from flushing medium outlet, converge rear heating (280 DEG C) and return to described flash tower with above-mentioned heavy grease and carry out flash distillation together with biodiesel coarse product, the amount of the part biological diesel oil of drawing from tower top is as the criterion as 9 meter per seconds to ensure its flow velocity in mechanical seal chamber.Adopt method of the present invention can effectively prevent the leakage of circulating pump sealing, this recycle pump can continuous service 13 months and is not leaked outside.
Embodiment 4
The present embodiment is for illustrating the process for purification of biodiesel provided by the invention.
Method according to embodiment 1 is refined biodiesel, different, and the biodiesel of drawing from tower top is cooled to after 60 DEG C through cooler, rinses described Seal cage.Adopt method of the present invention can effectively prevent the leakage of circulating pump sealing, this recycle pump can continuous service 10 months and is not leaked outside.
Embodiment 5
The present embodiment is for illustrating the process for purification of biodiesel provided by the invention.
Method according to embodiment 1 is refined biodiesel, different, and the flow velocity of the biodiesel of drawing from tower top in Seal cage is 4 meter per seconds.Adopt method of the present invention can effectively prevent the leakage of circulating pump sealing, this recycle pump can continuous service 9 months and is not leaked outside.
Comparative example 1
This comparative example is for illustrating biodiesel refining of reference.
Method according to embodiment 1 is refined biodiesel, different, and the medium that rinses described mechanical seal chamber is to export the part heavy grease of drawing from the circulatory mediator of recycle pump, that is:
Biodiesel coarse product obtained above is joined in flash tower, is that 280 DEG C, pressure are to carry out flash distillation under 0.65KPaA (absolute pressure) in temperature, and biodiesel is from overhead extraction, and heavy grease is from extraction at the bottom of tower.At the bottom of tower, draw the heavy grease that flow is 60t/h, this part heavy grease recycle pump of flowing through, then send back in flash tower after being heated to 280 DEG C by heater, distill refining together with biodiesel coarse product.Meanwhile, from the circulatory mediator outlet extension heavy grease of recycle pump, be cooled to after 110 DEG C through cooler, flushing medium entrance from the mechanical seal chamber of recycle pump is introduced, to rinse sealing chamber, and this heavy grease is drawn from flushing medium outlet, heating (280 DEG C) return to carry out flash distillation in described flash tower together with biodiesel coarse product converging with above-mentioned heavy grease of drawing from circulating-pump outlet, described in the amount of the part heavy grease of drawing be as the criterion as 8 meter per seconds to ensure its flow velocity in mechanical seal chamber.Method according to this comparative example is processed recycle pump, and this recycle pump continuous service leaked outside after 1 month.
Can find out from the result of embodiment 1-5, adopt method of the present invention can effectively reduce the risk of the leakage that prevents circulating pump sealing, recycle pump is the shortest also can continuous service 9 months and do not leak outside; And adopt the method for the prior art of comparative example 1 to process recycle pump, and recycle pump has only moved 1 month and has just occurred to leak outside, and as can be seen here, processing method provided by the invention can reduce the probability that circulating pump sealing is revealed greatly.In addition, because the present invention will rinse described recycle pump as flushing medium from flash distillation overhead extraction part biological diesel oil, the biodiesel liquid stream that contains carbonaceous particles obtaining after flushing returns and in flash tower, carry out flash distillation together with biodiesel crude product, can not cause the waste of material, realize object efficient, continuous production of biodiesel.
Claims (4)
1. a process for purification for biodiesel, the method comprises to be sent into biodiesel coarse product in flash tower and carries out flash distillation, and the condition of described flash distillation makes biodiesel from overhead extraction, and heavy grease is from extraction at the bottom of tower; Adopt recycle pump by part heavy grease from extraction at the bottom of tower, and return in flash tower after heating, it is characterized in that, the method also comprises and will introduce recycle pump from overhead extraction part biological diesel oil and rinse the mechanical seal chamber of described recycle pump, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and the biodiesel liquid stream that contains carbonaceous particles is drawn; Described carbonaceous particles is C
19-C
40the carbon distribution that ester class produces through high temperature cabonization coking and colloid; The temperature that the condition of rinsing comprises flushing is not higher than 120 DEG C, and the flow velocity of described biodiesel in mechanical seal chamber is 6-12 meter per second; Described biodiesel coarse product makes for grease and low-carbon alcohols are carried out to ester exchange under 260-280 DEG C, 6-8MPa.
2. method according to claim 1, wherein, described recycle pump comprises circulatory mediator entrance, circulatory mediator outlet and mechanical seal chamber, described mechanical seal chamber comprises flushing medium entrance and flushing medium outlet, the part heavy grease of extraction at the bottom of tower is introduced by described circulatory mediator entrance, and draw from circulatory mediator outlet through described recycle pump, part biological diesel oil from overhead extraction is introduced in the mechanical seal chamber of recycle pump by flushing medium entrance and rinsed described mechanical seal chamber, the condition of described flushing is stripped from the carbonaceous particles being attached in mechanical seal chamber, and export the biodiesel liquid stream that contains carbonaceous particles is drawn by flushing medium, and the heavy grease of drawing and the biodiesel liquid stream that contains carbonaceous particles are mixed, obtain mixture, described mixture is heated and return and in described flash tower, carry out flash distillation together with biodiesel coarse product.
3. method according to claim 1, wherein, the temperature of described flushing is 90-110 DEG C, the flow velocity of described biodiesel in mechanical seal chamber is 8-10 meter per second.
4. method according to claim 1 and 2, wherein, the temperature of the mixture that the heavy grease after heating or heavy grease and the biodiesel liquid that contains carbonaceous particles flow is 220-280 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110183667.6A CN102536779B (en) | 2011-06-30 | 2011-06-30 | Processing method for preventing seal leakage of circulating pump and purification method of biodiesel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110183667.6A CN102536779B (en) | 2011-06-30 | 2011-06-30 | Processing method for preventing seal leakage of circulating pump and purification method of biodiesel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102536779A CN102536779A (en) | 2012-07-04 |
| CN102536779B true CN102536779B (en) | 2014-11-26 |
Family
ID=46344531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110183667.6A Active CN102536779B (en) | 2011-06-30 | 2011-06-30 | Processing method for preventing seal leakage of circulating pump and purification method of biodiesel |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB341158A (en) * | 1929-10-31 | 1931-01-15 | Ig Farbenindustrie Ag | Improvements in the manufacture and production of esters |
| CN1743416A (en) * | 2004-08-30 | 2006-03-08 | 中油双星生物柴油有限公司 | Apparatus for producing biodiesel for vehicle and its preparing method |
| WO2008011731B1 (en) * | 2006-07-27 | 2008-06-26 | Forest Bioproducts Inc | A device for the transesterification of animal and plant glycerides into fatty acid alkyl esters for small scale production of biodiesel and value added products |
| CN201512523U (en) * | 2009-09-28 | 2010-06-23 | 刘新宇 | Biological diesel refining device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050027137A1 (en) * | 2003-07-29 | 2005-02-03 | Hooker Jeffrey D. | Apparatus and method for the production of fatty acid alkyl ester |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB341158A (en) * | 1929-10-31 | 1931-01-15 | Ig Farbenindustrie Ag | Improvements in the manufacture and production of esters |
| CN1743416A (en) * | 2004-08-30 | 2006-03-08 | 中油双星生物柴油有限公司 | Apparatus for producing biodiesel for vehicle and its preparing method |
| WO2008011731B1 (en) * | 2006-07-27 | 2008-06-26 | Forest Bioproducts Inc | A device for the transesterification of animal and plant glycerides into fatty acid alkyl esters for small scale production of biodiesel and value added products |
| CN201512523U (en) * | 2009-09-28 | 2010-06-23 | 刘新宇 | Biological diesel refining device |
Non-Patent Citations (2)
| Title |
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| 工艺条件对机械密封性能的影响;庄永福;《润滑与密封》;20040115(第01期);第76页，图2 * |
| 庄永福.工艺条件对机械密封性能的影响.《润滑与密封》.2004,(第01期), * |
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