CN213680544U - Device for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil - Google Patents
Device for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil Download PDFInfo
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Abstract
The application discloses a device for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil, which comprises a high-pressure hydrolysis kettle, a stirring kettle, a centrifugal pump, a tubular reactor, a first condenser, a first compressor, a conical inverted tower and a spiral feeder, wherein an outlet at the bottom of the stirring kettle is connected with an inlet at the left end of the tubular reactor through the centrifugal pump by a pipeline; an outlet at the upper part of the right end of the tubular reactor is connected with an inlet at the left end of the tubular reactor through a condenser I and a compressor I by a pipeline; an outlet at the lower part of the right end of the tubular reactor is connected with a conical inverted tower through a pipeline, and an outlet at the bottom of the conical inverted tower is connected with the stirring kettle through a pipeline through a spiral feeder; and the reaction liquid flowing out of an overflow port at the upper part of the conical inverted tower is sent to a post-treatment system. The device of the utility model has the advantages of simple flow, simple operation, cyclic utilization of waste oil, low hydrogen consumption, no generation of propane, low catalyst price and the like when the device is used for preparing the second-generation biodiesel through hydrodeoxygenation reaction.
Description
Technical Field
The utility model relates to a device based on discarded oil hydrodeoxygenation preparation second generation biodiesel.
Background
The waste edible oil is mixture of inedible animal oil and various oils and fats generated in daily food processing, catering service and other lives of people, is difficult to biodegrade, can cause anoxic death of organisms in water if directly discharged into water without treatment, and can also generate rancidity phenomenon to pollute the atmosphere if exposed in the air. The processing and conversion of waste oil such as waste cooking oil into biodiesel can solve the pollution problem and the problem of fossil diesel shortage. Chinese patent CN110511823A discloses a method for preparing second-generation biodiesel from waste oil from food processing, wherein the waste oil from food processing is pretreated to obtain crude oil, and is pre-esterified to obtain pre-esterified product, and is then trans-esterified to obtain fatty acid methyl ester, and finally hydrogenated to obtain second-generation biodiesel. Chinese patent CN200510045569.0 discloses a process for producing biodiesel by using waste cooking oil, which comprises pretreating the waste cooking oil to obtain crude biodiesel, heating to adjust pH value, standing, and filtering to obtain biodiesel. Chinese patent CN200710020352.3 discloses a method for producing biodiesel by using waste oil, which is to pretreat, pre-esterify, ice-melt and separate the waste oil to obtain the biodiesel.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a device for preparing second-generation biodiesel based on the hydrodeoxygenation of waste oil. The utility model discloses a process for preparing second generation biodiesel through hydrodeoxygenation reaction, it is simple to possess the flow, easy and simple to handle, make waste oil obtain cyclic utilization, hydrogen consumption is low, can not generate a plurality of advantages such as propane, catalyst low price.
The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized by comprising a high-pressure hydrolysis kettle, a stirring kettle, a centrifugal pump, a tubular reactor, a first condenser, a first compressor, a conical inverted tower and a spiral feeder, wherein the waste oil is subjected to high-pressure hydrolysis in the high-pressure hydrolysis kettle to form fatty acid, and the fatty acid and a catalyst are stirred and mixed in the stirring kettle to form a raw material mixed solution;
the outlet at the bottom of the stirring kettle is connected with the inlet at the left end of the tubular reactor through a centrifugal pump by a pipeline, and the inlet at the left end of the tubular reactor is also connected with a hydrogen steel cylinder through a pipeline so as to introduce hydrogen into the tubular reactor for hydrodeoxygenation reaction;
an outlet at the upper part of the right end of the tubular reactor is connected with an air inlet of a condenser through a pipeline, and an air outlet of the condenser is connected with an inlet at the left end of the tubular reactor through a compressor I through a pipeline to form a hydrogen recycling loop;
an outlet at the lower part of the right end of the tubular reactor is connected with a conical inverted tower through a pipeline so as to introduce reaction liquid after the hydrodeoxygenation reaction into the conical inverted tower for standing and precipitation, and an outlet at the bottom of the conical inverted tower is connected with a stirring kettle through a spiral feeder through a pipeline so as to send a catalyst obtained by precipitation back to the stirring kettle again; and the reaction liquid flowing out of an overflow port at the upper part of the conical inverted tower is sent to a post-treatment system.
The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized by further comprising a first heat exchanger, a second heat exchanger and a collecting tank, wherein an outlet of the centrifugal pump is connected with an inlet at the left end of the tubular reactor through a pipeline sequentially through a cold channel of the first heat exchanger and a cold channel of the second heat exchanger; an outlet at the lower part of the right end of the tubular reactor is connected with the conical inverted tower through a heat channel of the first heat exchanger by a pipeline, and a heat medium fluid is introduced into the heat channel of the second heat exchanger; and a liquid outlet of the first condenser is connected with the collecting tank through a pipeline so as to collect the organic matters condensed by the first condenser in the collecting tank.
The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized in that the post-treatment system comprises an extraction tower and a rectification system, an overflow port at the upper part of a conical inverted tower is connected with an inlet at the lower part of the extraction tower through a pipeline, alkali liquor is introduced into an inlet at the top of the extraction tower, extracted alkali liquor is discharged from an outlet at the bottom of the extraction tower, and an outlet at the upper part of the extraction tower is connected with the rectification system through a pipeline so as to send reaction liquid after extraction and desulfurization into the rectification system for rectification, separation and purification to obtain a final pure product; wherein, a filter screen is arranged at the overflow port at the upper part of the conical inverted tower.
The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized in that the rectifying system comprises a rectifying tower, a feed inlet of the rectifying tower is connected with an upper outlet of the extraction tower through a pipeline, a tower top gas outlet of the rectifying tower is sequentially connected with a second condenser, a first cold trap and a second compressor through pipelines, vacuum in the rectifying tower is maintained under the operation action of the second compressor, steam discharged from a tower top gas outlet of the rectifying tower is condensed by the second condenser, part of condensate is returned to the tower top of the rectifying tower as reflux liquid, and the rest of condensate is collected in a first container tank as the distillate; and a reboiler is connected to the bottom of the rectifying tower, part of the kettle liquid is heated and vaporized by the reboiler to form steam, and part of the kettle liquid in the reboiler enters the second cold trap to be cooled and is collected in the second container as a tower bottom product.
A device based on abandonment grease hydrodeoxygenation preparation second generation biodiesel, its characterized in that be equipped with the puddler in the tubular reactor, the lateral wall of puddler is equipped with the vortex fin, the right-hand member of puddler is worn out and is connected the motor from the right-hand member middle part of tubular reactor, the puddler rotation in the tubular reactor can be driven to the motor, under vortex fin pivoted effect on the puddler lateral wall, make the reaction liquid homogeneous mixing in the tubular reactor.
The process for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized by comprising the following steps of:
1) carrying out high-pressure hydrolysis on the waste oil to obtain fatty acid;
2) adding fatty acid into a stirring kettle, simultaneously adding a hydrogenation catalyst and a vulcanizing agent into the stirring kettle, and uniformly stirring and mixing to form a raw material mixed solution;
3) pumping the raw material mixed liquor in the stirring kettle by a centrifugal pump, preheating by a first heat exchanger, feeding the preheated raw material mixed liquor and hydrogen into a second heat exchanger for further heating to a reaction temperature, and feeding the heated raw material mixed liquor into a tubular reactor from a left end inlet of the tubular reactor for reaction;
4) unreacted hydrogen is discharged from an outlet at the upper part of the right end of the tubular reactor, organic matters carried by the hydrogen are condensed by a first condenser, and then the condensed organic matters are pressurized into high-pressure hydrogen by a first compressor, and the high-pressure hydrogen can be reused in the tubular reactor, wherein the organic matters condensed by the first condenser are collected in a collection tank;
5) discharging the reaction mixed liquid after the reaction from an outlet at the lower part of the right end of the tubular reactor, performing heat exchange with the raw material mixed liquid in a first heat exchanger, allowing the reaction mixed liquid to enter a conical inverted tower for standing and precipitation to separate a reaction product from a hydrogenation catalyst, and feeding the hydrogenation catalyst settled at the bottom of the conical inverted tower back to the stirring kettle by a screw feeder to realize the recycling of the hydrogenation catalyst; and (4) carrying out post-treatment on the reaction product after the hydrogenation catalyst is removed to obtain a final product.
The process for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized in that in the step 1), the waste oil is one of waste cooking oil, hogwash oil, swill oil and swill-cooked dirty oil; the waste grease is firstly subjected to precipitation, filtration and pretreatment for removing water impurities, and then is subjected to high-pressure hydrolysis, wherein the temperature of the high-pressure hydrolysis is 70-90 ℃, the pressure of the high-pressure hydrolysis is 0.5-0.7MPa, and the time of the high-pressure hydrolysis is 1-6 hours.
The process for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized in that in the step 2), the catalyst is a transition metal catalyst or a noble metal catalyst; wherein, the catalyst carrier of the transition metal catalyst is alumina, the hydrogenation active component is one or more of sulfuration state Ni, Mo, W, Co and La, for example, the transition metal catalyst is Ni-Mo-W/Al2O3、Ni-Co-W/Al2O3、Ni-Co-La/Al2O3、Ni-Mo-La/Al2O3Or Ni-W-La/Al2O3. The carrier of the noble metal catalyst is alumina, and the active component of the noble metal catalyst is at least one of Pt and Pd.
The process for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized in that a first heat exchanger preheats a raw material mixed solution to 80-350 ℃, a second heat exchanger further heats the raw material mixed solution to 100-500 ℃, and the reaction temperature in a tubular reactor is 100-500 ℃; the volume ratio of hydrogen to oil entering the left end inlet of the tubular reactor is 100-2000, the reaction residence time in the tubular reactor is 1-48 h, and the reaction pressure in the tubular reactor is 1-10 Mpa.
The process for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is characterized in that in the step 2), in a raw material mixed solution formed by mixing fatty acid, a hydrogenation catalyst and a vulcanizing agent, the mass fraction of the hydrogenation catalyst is 10-25%, the vulcanizing agent is carbon disulfide, and the volume of the vulcanizing agent is 1-2.5% of that of the fatty acid;
the post-treatment process of the reaction product in the step 5) comprises the following steps: introducing a reaction product from an inlet at the lower part of the extraction tower, simultaneously introducing alkali liquor from an inlet at the top part of the extraction tower, and performing countercurrent contact extraction on the alkali liquor and the reaction product in the extraction tower so as to perform desulfurization treatment on the reaction product; the desulfurized reaction product flowing out of the upper outlet of the extraction tower enters a rectifying tower to be rectified, separated and purified, and a final product is obtained; wherein the volume ratio of the alkali liquor to the reaction product is 1: 1-10 in the sodium hydroxide aqueous solution with the mass concentration of 20-40% of the alkali liquor.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model discloses having carried out the high pressure preliminary treatment of hydrolysising to abandonment grease and having obtained fatty acid and carried out hydrodeoxygenation again and handled, avoided because abandonment grease component is undefined, impurity reason such as many can not carry out the hydrodeoxygenation reaction in tubular reactor, the fatty acid purity that the high pressure hydrolysis technique obtained in addition is high, the component clearly can not produce other components such as propane, has saved the consumption of hydrogen in the hydrodeoxygenation reaction stage simultaneously, the utility model discloses the catalyst that uses is Ni-Mo-W Al2O3When the non-noble metal catalyst, compare with the noble metal catalyst that active component is Pt or Pd load and saved manufacturing cost, the utility model designs a but catalyst circulation and serialization production use route.
Drawings
FIG. 1 is a schematic structural diagram of the apparatus used in the process for preparing the second-generation biodiesel based on the hydrodeoxygenation of waste oils according to the present invention;
in fig. 1: 1-stirred tank, 2-centrifugal pump, 3-first heat exchanger, 4-second heat exchanger, 5-tubular reactor, 7-first condenser, 8-collecting tank, 9-, 10-conical inverted tower, 11-spiral feeder, 12-extraction tower, 13-rectifying tower, 14-second condenser, 15-first container, 16-first cold trap, 17-second compressor, 18-reboiler, 19-second cold trap, and 20-second container.
Detailed Description
The present invention will be further described with reference to the following specific examples, but the scope of the present invention is not limited thereto.
Example (b): compare FIG. 1
The device adopted by the process for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil is shown in figure 1, and can be seen from figure 1:
a device for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil comprises a high-pressure hydrolysis kettle, a stirring kettle 1, a centrifugal pump 2, a tubular reactor 5, a condenser I7, a compressor I9, a conical inverted tower 10 and a spiral feeder 11, wherein the waste oil is subjected to high-pressure hydrolysis in the high-pressure hydrolysis kettle to form fatty acid, and the fatty acid and a catalyst are stirred and mixed in the stirring kettle 1 to form a raw material mixed solution; an outlet at the bottom of the stirring kettle 1 is connected with an inlet at the left end of the tubular reactor 5 through a centrifugal pump 2 by a pipeline, and an inlet at the left end of the tubular reactor 5 is also connected with a hydrogen steel cylinder by a pipeline so as to introduce hydrogen into the tubular reactor 5 for hydrodeoxygenation reaction;
an outlet at the upper part of the right end of the tubular reactor 5 is connected with an air inlet of a condenser I7 through a pipeline, an air outlet of the condenser I7 is connected with an inlet at the left end of the tubular reactor 5 through a compressor I9 through a pipeline, and a hydrogen recycling loop is formed;
an outlet at the lower part of the right end of the tubular reactor 5 is connected with a conical inverted tower 10 through a pipeline so as to introduce reaction liquid after the hydrodeoxygenation reaction into the conical inverted tower 10 for standing and precipitation, and an outlet at the bottom of the conical inverted tower 10 is connected with the stirring kettle 1 through a spiral feeder 11 through a pipeline so as to send the catalyst obtained by precipitation back to the stirring kettle 1 again; the reaction liquid flowing out of an overflow port at the upper part of the conical inverted tower 10 is sent to a post-treatment system.
Further, the device of the application also comprises a first heat exchanger 3, a second heat exchanger 4 and a collecting tank 8, wherein an outlet of the centrifugal pump 2 is connected with an inlet at the left end of the tubular reactor 5 through a pipeline sequentially through a cold channel of the first heat exchanger 3 and a cold channel of the second heat exchanger 4; the lower outlet of the right end of the tubular reactor 5 is connected with the conical inverted tower 10 through a heat channel of the first heat exchanger 3 by a pipeline, and a heat medium fluid is introduced into the heat channel of the second heat exchanger 4; the liquid outlet of the first condenser 7 is connected with the collecting tank 8 through a pipeline, so that organic matters condensed by the first condenser 7 are collected in the collecting tank 8.
Referring to fig. 1, the post-treatment system of the present application includes an extraction tower 12 and a rectification system, an overflow port at the upper part of a conical inverted tower 10 is connected with a lower inlet of the extraction tower 12 through a pipeline, an alkali liquor is introduced into a top inlet of the extraction tower 12, an extracted alkali liquor is discharged from a bottom outlet of the extraction tower 12, and an upper outlet of the extraction tower 12 is connected with the rectification system through a pipeline, so that a reaction solution after extraction and desulfurization is sent into the rectification system for rectification separation and purification to obtain a final pure product; wherein, a filter screen is arranged at the overflow port at the upper part of the conical inverted tower 10.
Referring to fig. 1, the rectification system includes a rectification column 13, a feed inlet of the rectification column 13 is connected with an upper outlet of the extraction column 12 through a pipeline, a gas outlet at the top of the rectification column 13 is connected with a second condenser 14, a first cold trap 16 and a second compressor 17 through pipelines in sequence, vacuum in the rectification column 13 is maintained under the operation action of the second compressor 17, steam discharged from a gas outlet at the top of the rectification column 13 is condensed by the second condenser 14, part of condensate is returned to the top of the rectification column 13 as reflux, and the rest of condensate is collected in a first container tank 15 as distillate; the bottom of the rectifying tower 13 is connected with a reboiler 18, the reboiler 18 heats and vaporizes part of the kettle liquid to form steam, and part of the kettle liquid in the reboiler 18 enters a second cold trap 19 to be cooled and then is collected in a second container tank 20 as a tower bottom product.
In order to enable the reaction liquid to be uniformly mixed in the tubular reactor 5, a stirring rod is arranged in the tubular reactor 5, the outer side wall of the stirring rod is provided with turbulence fins, the right end of the stirring rod penetrates out from the middle part of the right end of the tubular reactor 5 and is connected with a motor, the motor can drive the stirring rod in the tubular reactor 5 to rotate, and the reaction liquid in the tubular reactor 5 is enabled to be uniformly mixed under the rotating effect of the turbulence fins on the outer side wall of the stirring rod.
Blank example 1:
Ni-Mo-W/Al2O3the preparation method of the hydrodeoxygenation catalyst comprises the following steps:
1) preparing a catalyst carrier: weighing 20.0 g of pseudo-boehmite powder and 1.0 g of sesbania powder, uniformly mixing, adding 5mL of deionized water, dropwise adding two drops of 98% HNO3 solution (about 0.1mL), and continuously addingIonized water until the mixed powder of the pseudo-boehmite powder and the sesbania powder is full of viscosity, kneading the mixture into a cluster, extruding the cluster into thin strips (the diameter is 2mm) by using a strip extruding machine, and drying the strips in a blast type oven at the temperature of 105 ℃ for 4 hours. And taking out the dried strips, and roasting for 4 hours in a muffle furnace at 500 ℃. And cutting the thin strips into small strips with the length of 3-5 mm after fully cooling. The small strips are the catalyst carrier gamma-Al2O3；
2) Preparing a catalyst precursor: dissolving nickel nitrate, ammonium molybdate tetrahydrate and ammonium metatungstate in deionized water to prepare a precursor solution; soaking the catalyst carrier gamma-Al 2O3 obtained in the step 1) in a precursor solution for 12 hours at room temperature by an isometric soaking method, drying at 105 ℃ to evaporate water, and roasting at 500 ℃ for 4 hours in an air atmosphere to obtain the catalyst precursor.
3) Putting the catalyst precursor obtained in the step 2) into H2Reducing for 2h at 350 ℃ in the atmosphere to obtain the final Ni-Mo-W/Al2O3A hydrodeoxygenation catalyst. Prepared Ni-Mo-W/Al2O3In the hydrodeoxygenation catalyst, the loading of Ni was 10%, the loading of Mo was 5%, and the loading of W was 3%.
Example 1:
a process for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil (a production device adopts a structure shown in figure 1), comprises the following steps:
s1: heating the illegal cooking oil to 80 ℃, performing high-pressure hydrolysis treatment after precipitation, filtration and impurity removal, and then dehydrating and distilling to obtain C15-18 mixed fatty acid; wherein the pressure of high-pressure hydrolysis is 0.6MPa, the hydrolysis time is 5 hours, and the high-pressure hydrolysis of the grease increases the solubility of water in the grease until the grease is in a highly miscible state, so that the hydrolysis speed is greatly accelerated; the continuous water addition can continuously discharge the glycerol obtained by hydrolysis to the outside of the system, thus destroying the equilibrium state of the reaction and leading the hydrolysis reaction of the grease to move to the hydrolysis direction, thus greatly improving the hydrolysis rate. The hydrolysis time of the high-pressure hydrolysis is short, the hydrolysis rate is high (98-99.5%), the production capacity is high, and the produced fatty acid can reach the decolorization degree.
S2: adding the mixed fatty acid obtained in the step S1 into a stirring kettle, and simultaneously adding the Ni-Mo-W/Al obtained in the blank example 1 into the stirring kettle2O3Adding a carbon disulfide n-heptane solution (the volume ratio of carbon disulfide to n-heptane is 1: 1), and stirring and mixing uniformly to form a raw material mixed solution. In the raw material mixed solution formed by stirring, the mass fraction of the catalyst is 20%, the volume concentration of carbon disulfide is 2%, and the purpose of adding the carbon disulfide is to carry out vulcanization modification on the catalyst so as to form a vulcanized hydrogenation catalyst;
s3: the raw material mixed liquid is mixed by a centrifugal pump at 70m3Conveying the mixture into a tubular reactor at a flow rate, raising the temperature to 300 ℃ along the way through a first heat exchanger, further raising the temperature to 350 ℃ through a second heat exchanger, and finally conveying the raw material mixed solution at 350 ℃ into the tubular reactor for heat preservation reaction at 350 ℃; simultaneously introducing fresh H into the tubular reactor2In H2Reacting under the pressure of 5MPa, and carrying out hydrodeoxygenation reaction on the mixed fatty acid under the action of a catalyst to obtain a long-chain alkane substance;
s4: the retention time of the reaction mixed liquid in the tubular reactor is 40h, the reaction mixed liquid after the reaction enters a conical inverted tower for standing and precipitation so as to separate a reaction product from a hydrogenation catalyst, and the hydrogenation catalyst settled at the bottom of the conical inverted tower is sent back to the stirring kettle by a screw feeder, so that the reuse of the hydrogenation catalyst is realized; and (4) carrying out post-treatment on the reaction product after the hydrogenation catalyst is removed to obtain a final product.
Wherein, the post-treatment process of the reaction product comprises the following steps: and introducing the reaction product from an inlet at the lower part of the extraction tower, and introducing alkali liquor from an inlet at the top of the extraction tower, wherein the alkali liquor is selected from sodium hydroxide aqueous solution with the mass concentration of 30%, and the volume ratio of the alkali liquor to the reaction product is 1: and 10, performing countercurrent contact extraction on the alkali liquor and the reaction product in the extraction tower, thereby performing desulfurization treatment on the reaction product. According to the above production process, the results can be obtained: in the presence of Ni-Mo-W/Al2O3Under the action of hydrodeoxygenation catalyst, the hydrodeoxygenation reaction is carried out to obtain liquid of C15-18 alkaneAnd (4) continuously reacting the product in the reactor for 40 hours, and then taking a desulfurized sample for analysis. The desulfurization rate of the product reaches 70%, the fatty acid conversion rate is 100.0%, the yield of C15-18 alkane reaches 95.3%, and the yields of C15-18 alkane are 1.01%, 10.26%, 5.00% and 79.03%, respectively.
Wherein, in the process method of the utility model, the reaction product after desulfurization is sent into a rectifying tower for rectification, separation and purification, and various final pure products can be obtained.
Example 2:
a process for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil (a production device adopts a structure shown in figure 1), comprises the following steps:
s1: heating the illegal cooking oil to 80 ℃, performing high-pressure hydrolysis treatment after precipitation, filtration and impurity removal, and then dehydrating and distilling to obtain C15-18 mixed fatty acid; wherein the pressure of high-pressure hydrolysis is 0.6MPa, and the hydrolysis time is 5 hours;
s2: adding the mixed fatty acid obtained in the step S1 into a stirring kettle, and simultaneously adding the Ni-Mo-W/Al obtained in the blank example 1 into the stirring kettle2O3Adding a carbon disulfide n-heptane solution (the volume ratio of carbon disulfide to n-heptane is 1: 1), and stirring and mixing uniformly to form a raw material mixed solution. Wherein in the raw material mixed solution formed by stirring, the mass fraction of the catalyst is 20 percent, and the volume concentration of the carbon disulfide is 2 percent;
s3: the raw material mixed liquid is mixed by a centrifugal pump at 70m3The flow rate of the raw materials is conveyed to a tubular reactor, the temperature is raised to 400 ℃ through a first heat exchanger and further raised to 450 ℃ through a second heat exchanger along the way, and finally the raw material mixed solution at 450 ℃ is conveyed to the tubular reactor to be subjected to heat preservation reaction at 450 ℃; simultaneously introducing fresh H into the tubular reactor2In H2Reacting under the pressure of 5MPa, and carrying out hydrodeoxygenation reaction on the mixed fatty acid under the action of a catalyst to obtain a long-chain alkane product;
s4: the retention time of the reaction mixed liquid in the tubular reactor is 40h, the reaction mixed liquid after the reaction enters a conical inverted tower for standing and precipitation so as to separate a reaction product from a hydrogenation catalyst, and the hydrogenation catalyst settled at the bottom of the conical inverted tower is sent back to the stirring kettle by a screw feeder, so that the reuse of the hydrogenation catalyst is realized; and (4) carrying out post-treatment on the reaction product after the hydrogenation catalyst is removed to obtain a final product.
Wherein, the post-treatment process of the reaction product comprises the following steps: and introducing the reaction product from an inlet at the lower part of the extraction tower, and simultaneously introducing alkali liquor from an inlet at the top part of the extraction tower, wherein the alkali liquor is selected from sodium hydroxide aqueous solution with the mass concentration of 30%, the volume ratio of the alkali liquor to the reaction product is 1:10, and the alkali liquor and the reaction product are subjected to countercurrent contact extraction in the extraction tower, so that the reaction product is subjected to desulfurization treatment. According to the above production process, the results can be obtained: in the presence of Ni-Mo-W/Al2O3Under the action of the hydrodeoxygenation catalyst, a hydrodeoxygenation reaction is carried out to obtain a liquid product which is basically C15-18 alkane, the liquid product continuously reacts in a reactor for 40 hours, and then a desulfurized sample is taken for analysis. The desulfurization rate of the product reaches 70%, the fatty acid conversion rate is 98.0%, the yield of C15-18 alkane reaches 95.34%, and the yields of C15-18 alkane are 1.00%, 10.27%, 4.00% and 80.07%, respectively.
Wherein, in the process method of the utility model, the reaction product after desulfurization is sent into a rectifying tower for rectification, separation and purification, and various final pure products can be obtained.
The description is given for the sake of illustration only, and should not be construed as limiting the scope of the invention to the particular forms set forth in the examples.
Claims (5)
1. A device for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil is characterized by comprising a high-pressure hydrolysis kettle, a stirring kettle (1), a centrifugal pump (2), a tubular reactor (5), a condenser I (7), a compressor I (9), a conical inverted tower (10) and a spiral feeder (11), wherein the waste oil is subjected to high-pressure hydrolysis in the high-pressure hydrolysis kettle to form fatty acid, and the fatty acid and a catalyst are stirred and mixed in the stirring kettle (1) to form a raw material mixed solution;
an outlet at the bottom of the stirring kettle (1) is connected with an inlet at the left end of the tubular reactor (5) through a centrifugal pump (2) by a pipeline, and an inlet at the left end of the tubular reactor (5) is also connected with a hydrogen steel cylinder through a pipeline so as to introduce hydrogen into the tubular reactor (5) for hydrodeoxygenation reaction;
an outlet at the upper part of the right end of the tubular reactor (5) is connected with an air inlet of a condenser I (7) through a pipeline, an air outlet of the condenser I (7) is connected with an inlet at the left end of the tubular reactor (5) through a compressor I (9) through a pipeline, and a hydrogen recycling loop is formed;
an outlet at the lower part of the right end of the tubular reactor (5) is connected with a conical inverted tower (10) through a pipeline so as to introduce reaction liquid after the hydrodeoxygenation reaction into the conical inverted tower (10) for standing and precipitation, and an outlet at the bottom of the conical inverted tower (10) is connected with the stirring kettle (1) through a spiral feeder (11) through a pipeline so as to send the catalyst obtained by precipitation back to the stirring kettle (1); the reaction liquid flowing out of an overflow port at the upper part of the conical inverted tower (10) is sent to a post-treatment system.
2. The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil and fat as claimed in claim 1, which is characterized by further comprising a first heat exchanger (3), a second heat exchanger (4) and a collecting tank (8), wherein an outlet of the centrifugal pump (2) is connected with an inlet at the left end of the tubular reactor (5) through a pipeline sequentially through a cold channel of the first heat exchanger (3) and a cold channel of the second heat exchanger (4); the lower outlet of the right end of the tubular reactor (5) is connected with the conical inverted tower (10) through a heat channel of the first heat exchanger (3) by a pipeline, and a heat medium fluid is introduced into the heat channel of the second heat exchanger (4); the liquid outlet of the first condenser (7) is connected with the collecting tank (8) through a pipeline so as to collect the organic matters condensed by the first condenser (7) in the collecting tank (8).
3. The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil and fat as claimed in claim 1, wherein the post-treatment system comprises an extraction tower (12) and a rectification system, an overflow port at the upper part of the conical inverted tower (10) is connected with an inlet at the lower part of the extraction tower (12) through a pipeline, an alkali liquor is introduced into an inlet at the top part of the extraction tower (12), an extracted alkali liquor is discharged from an outlet at the bottom part of the extraction tower (12), and an outlet at the upper part of the extraction tower (12) is connected with the rectification system through a pipeline so as to convey the reaction liquid after extraction and desulfurization into the rectification system for rectification separation and purification to obtain a final pure product; wherein a filter screen is arranged at the overflow port at the upper part of the conical inverted tower (10).
4. The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil and fat as claimed in claim 3, wherein the rectification system comprises a rectification tower (13), a feed inlet of the rectification tower (13) is connected with an upper outlet of the extraction tower (12) through a pipeline, an outlet at the top of the rectification tower (13) is sequentially connected with a second condenser (14), a first cold trap (16) and a second compressor (17) through pipelines, vacuum in the rectification tower (13) is maintained under the operation action of the second compressor (17), steam discharged from an outlet at the top of the rectification tower (13) is condensed by the second condenser (14), part of condensate returns to the top of the rectification tower (13) as reflux liquid, and the rest of condensate is collected in a first container tank (15) as distillate; the bottom of the rectifying tower (13) is connected with a reboiler (18), the reboiler (18) heats and vaporizes part of the kettle liquid to form steam, and part of the kettle liquid in the reboiler (18) enters a second cold trap (19) to be cooled and then is collected in a second container tank (20) as a tower bottom product.
5. The device for preparing the second-generation biodiesel based on the hydrodeoxygenation of the waste oil and fat as claimed in claim 1, wherein a stirring rod is arranged in the tubular reactor (5), turbulence fins are arranged on the outer side wall of the stirring rod, the right end of the stirring rod penetrates out from the middle part of the right end of the tubular reactor (5) and is connected with a motor, the motor can drive the stirring rod in the tubular reactor (5) to rotate, and reaction liquid in the tubular reactor (5) is promoted to be uniformly mixed under the action of the rotation of the turbulence fins on the outer side wall of the stirring rod.
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| CN112457878A (en) * | 2020-11-28 | 2021-03-09 | 浙江工业大学 | Device and process for preparing second-generation biodiesel based on hydrodeoxygenation of waste oil |
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