CN110871080A - Methyl isobutyl ketone low-temperature hydrogenation catalyst, preparation method and application - Google Patents
Methyl isobutyl ketone low-temperature hydrogenation catalyst, preparation method and application Download PDFInfo
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- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/835—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with germanium, tin or lead
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- C07C29/136—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH
- C07C29/143—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of ketones
- C07C29/145—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of ketones with hydrogen or hydrogen-containing gases
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Abstract
The invention discloses a methyl isobutyl ketone low-temperature hydrogenation catalyst, a preparation method and application. The catalyst comprises: the total weight of the catalyst is 100 parts, and the weight of nickel is 10-25 parts; 0.5-3 parts of lead; 72-89.5 parts of lanthanum modified alumina carrier; the content of lanthanum in the carrier is 1-5 wt%. The catalyst of the invention has good stability, high activity and high selectivity at low temperature.
Description
Technical Field
The invention relates to the field of catalysts, and particularly relates to a methyl isobutyl ketone low-temperature hydrogenation catalyst, a preparation method and application thereof.
Background
Methyl isobutyl carbinol (also known as 4-methyl-2-pentanol, abbreviated as MIBC in english) is an excellent medium boiling point solvent, is used as a raw material for organic synthesis, a mineral flotation lotion, such as extracted silicon and nickel sulfate ore, and also can be used as a brake fluid, and also can be used as a solvent for dyes, petroleum, rubber, resins, paraffin, nitrocellulose, ethyl cellulose and the like, and can be used as an inert solvent for nitrocellulose lacquer, which can increase the gloss and smoothness of a coating, improve the reddening property, and be used as a solvent in the manufacture of a lubricating oil additive, and the like.
Methyl isobutyl carbinol (MIBC) has considerable market prospects for use as a mineral flotation agent. In 2013, the consumption of the global flotation agent is about 10 million t, and the sales amount is about 2 hundred million dollars. North america is the world's region with the most spent flotation agents, with an estimated consumption of 2.38 million tons, followed by the south america, with annual consumption approaching 2 million tons. North america and east asia use flotation agents primarily for the production of metal sulphides, coal and iron ores, while south america is primarily used for mining copper ores, followed by lead/zinc/silver ores. In recent years, in developing countries, coal is exported to developed countries, and in order to meet the environmental protection requirements of destination countries, coal needs to be floated. Methyl phenol, as a flotation agent, is still used in some countries, but will be gradually eliminated due to environmental problems. Thus, the demand for MIBC will be greater. In recent years, the demand of methyl isobutyl alcohol is continuously increased, the market prospect is very optimistic, and the price is high.
On the other hand, with the continuous construction of domestic methyl isobutyl ketone (MIBK for short), the device for simply producing MIBK has no profitability, and most devices are in a production stop or low-load operation state. Industry has begun to look for downstream products of MIBK to improve the profitability and risk resistance of the device, one of the important products being MIBC, which has a good market value.
Chinese patent CN 1325837A discloses a method for preparing corresponding alcohol by ketone hydrogenation, in a fixed bed reactor, raw material ketone contacts with a hydrogenation catalyst to generate hydrogenation reaction with hydrogen to generate alcohol with the same carbon atom number as the raw material ketone. The raw material ketone is selected from acetone, methyl isopropyl ketone, methyl isobutyl ketone and diisobutyl ketone, and the hydrogenation catalyst comprises 10-80% of CuO、2～85％Al2O30.1 to 5.0% of an alkali metal oxide and 0 to 60% of an oxide of Zn, Mg, Cr or a mixture thereof. The reaction temperature is 100-250 ℃, the reaction pressure is normal pressure-6.0 MPa, the molecular ratio of hydrogen and ketone in the feeding is 1-6, and the liquid hourly space velocity of the feeding ketone is 0.2-5.0 h-1. In the examples, 100ml of catalyst was charged into a fixed bed reactor having a diameter of 20mm, and the liquid hourly volume space velocity of methyl isobutyl ketone was 1.0h-1The hydrogen-ketone ratio is 5:1, the reaction temperature is 180 ℃, the pressure is 2.0MPa, the MIBK conversion rate is 89.4 percent, and the MIBC selectivity is 99.9 percent.
The performance of the copper-based catalyst in the hydrogenation reaction of methyl isobutyl ketone is examined by dawning and Bo. The CuO-ZnO system catalyst is synthesized by adopting a parallel-flow coprecipitation method, and the influence of factors such as the composition, preparation conditions, reaction conditions and the like of the catalyst on the reaction performance of the catalyst is examined. At the temperature of 220 ℃, the pressure of 4MPa and the space velocity of 0.6h-1Under the conditions of hydrogen-ketone ratio of 15 and reduction temperature of 270 ℃, the CuO-ZnO catalyst with the copper-zinc molar ratio of 1:3 is used, the conversion rate of MIBK can reach 99.7%, and the selectivity of MIBC is more than 99%.
The copper-based catalysts disclosed at present have high selectivity, but the reaction temperature is relatively high, and no data for long-term stability examination is disclosed, and no relevant reports of industrialization are found. The research on the stability of the catalyst is a decisive index for the industrialization of the catalyst.
Using skeleton nickel as a catalyst, and performing liquid phase hydrogenation on MIBK to prepare MIBC, wherein the optimal skeleton nickel activation conditions are that the mass fraction of alkali liquor is 20.00%, the activation temperature is 90 ℃, and the activation time is 3 hours; under the conditions of 105 ℃ and 115 ℃, the hydrogen pressure of 1.2MPa and the stirring speed of 1000r/min, the MIBK conversion rate can reach 100 percent and the MIBC yield is 99 percent. However, the method has the disadvantages of complex process, reaction time of about 50min and troublesome operation.
Liaotao et al use self-made alumina supported skeleton Raney nickel as catalyst, at 170 deg.C, 4.0MPa of reaction pressure, 400 of hydrogen-ketone volume ratio and 0.8h of liquid airspeed-1Under the condition, the conversion rate of the methyl isobutyl ketone can reach 99.1 percent, and the selectivity of the methyl isobutyl carbinol can reach 99.9 percent％。
The raney nickel catalysts described above are selective but each has its own problems. The skeletal nickel is powdery raney nickel, the hydrogenation reaction is carried out in an autoclave, the operation is troublesome, the reaction time is long, and the other side also indicates that the catalyst does not have good activity. The supported Raney nickel is used at the reaction temperature of 170 ℃ and the reaction pressure of 4.0MPa, which also shows that the Raney nickel has lower dispersity relative to a nickel catalyst prepared by an impregnation or coprecipitation method and the like, and the effective utilization rate of nickel atoms is lower, so that the reaction temperature is higher and the reaction pressure is higher.
The copper-based catalysts disclosed at present have high selectivity, but the reaction temperature is relatively high, and no data for long-term stability examination is disclosed, and no relevant reports of industrialization are found. The research on the stability of the catalyst is a decisive index for the industrialization of the catalyst.
Therefore, there is still a need to develop a low-temperature, low-pressure, high-activity, high-selectivity catalyst.
Disclosure of Invention
The invention provides a methyl isobutyl ketone low-temperature hydrogenation catalyst, a preparation method and application, aiming at solving the technical problems of lack of stability, low reaction activity and the like of the catalyst in the prior art. The catalyst of the invention has good stability, high activity and high selectivity at low temperature.
One of the purposes of the invention is to provide a methyl isobutyl ketone low-temperature hydrogenation catalyst.
The catalyst comprises:
measured by taking the total weight of the catalyst as 100 parts,
10-25 parts of nickel; preferably 12-20 parts;
0.5-3 parts of lead; preferably 0.8-2 parts;
72-89.5 parts of lanthanum modified alumina carrier; preferably 78 to 87.2 parts;
the content of lanthanum in the carrier is 1-5 wt%, preferably 1.5-4.5 wt%.
The catalyst component can also contain barium, and the dosage of each component is as follows:
measured by taking the total weight of the catalyst as 100 parts,
12-20 parts of nickel;
0.8-2 parts of lead;
0.5-5 parts of barium;
73-86.7 parts of lanthanum modified alumina carrier.
Wherein the content of the first and second substances,
the lanthanum-modified alumina carrier is prepared by adding soluble lanthanum salt in the process of preparing pseudo-boehmite powder to obtain pseudo-boehmite containing lanthanum, and then forming into a carrier.
The preparation method of the lanthanum-modified alumina carrier comprises the following steps:
adding soluble lanthanum salt into an aluminum sulfate solution, feeding the soluble lanthanum salt and a sodium metaaluminate solution into a pseudo-boehmite synthesis tank in a cocurrent flow manner, controlling the flow rate of the two solutions to enable the pH value of a reaction solution in the pseudo-boehmite synthesis tank to be 6.5-8.0, and then aging, filtering, washing, drying and roasting to obtain the lanthanum-modified alumina carrier.
The second purpose of the invention is to provide a preparation method of the methyl isobutyl ketone low-temperature hydrogenation catalyst.
The method comprises the following steps:
(1) the load component is as follows: dissolving soluble nickel salt and lead salt or soluble nickel salt, lead salt and barium salt into mixed salt solution, spraying or dipping the mixed salt solution on a carrier, drying and decomposing the salt;
(2) reduction: the catalyst is reduced with hydrogen or a mixture of hydrogen and nitrogen.
The reduction temperature does not exceed 500 ℃.
The invention also aims to provide an application of the methyl isobutyl ketone low-temperature hydrogenation catalyst.
The catalyst is loaded in a reactor, a methyl isobutyl ketone raw material and hydrogen are respectively preheated and then mixed and are fed into the upper end of the reactor, the mass ratio of the methyl isobutyl ketone to the hydrogen is 2: 1-8: 1 during feeding, and the liquid hourly space velocity of the methyl isobutyl ketone is 0.1-1.0 h-1At a reaction pressure of 1.0 to 3.0MPa and a reaction temperature of 110 DEG CHydrogenation reaction is carried out at the temperature of 160 ℃;
the preheating temperature of the methyl isobutyl ketone and the hydrogen is controlled so that the liquid phase amount of the methyl isobutyl ketone accounts for 10 to 40 percent of the total amount of the methyl isobutyl ketone and the hydrogen after the methyl isobutyl ketone and the hydrogen are mixed.
Preferably:
the mass ratio of the methyl isobutyl ketone to the hydrogen in the feeding process is 3: 1-5: 1, and the liquid hourly space velocity of the methyl isobutyl ketone is 0.2-0.8 h-1Carrying out hydrogenation reaction at a reaction pressure of 1.5-2.5 MPa and a reaction temperature of 120-150 ℃;
the liquid phase amount of the methyl isobutyl ketone accounts for 10 to 30 percent of the total amount of the methyl isobutyl ketone and the hydrogen after the methyl isobutyl ketone and the hydrogen are mixed.
The reactor may be any conventional reactor in the art, and a trickle bed reactor may be preferred in the present invention.
The invention can adopt the following technical scheme:
a catalyst for preparing 4-methyl-2-pentanol by hydrogenation of methyl isobutyl ketone is measured by taking the whole weight of the catalyst as 100 parts, and comprises 10-25 parts of nickel, 0.5-3 parts of lead and 72-89.5 parts of lanthanum modified alumina carrier, wherein the lanthanum modified alumina carrier is prepared by adding soluble lanthanum salt in the process of preparing pseudo-boehmite powder to obtain pseudo-boehmite containing lanthanum, and then forming into a carrier, wherein the content of lanthanum in the carrier is 1-5 wt%.
In order to further highlight the performance of the catalyst of the invention, more preferably, the catalyst is measured by taking the total weight of the catalyst as 100 parts, and preferably comprises 12-20 parts of nickel, 0.8-2 parts of lead and 78-87.2 parts of lanthanum modified alumina carrier. Further preferably comprises a barium component which comprises 12-20 parts of nickel, 0.8-2 parts of lead, 0.5-5 parts of barium and 73-86.7 parts of lanthanum modified alumina carrier by taking the total weight of the catalyst as 100 parts.
The catalyst of the present invention is not limited to the above-mentioned supported component and carrier, but also includes other components useful for the catalyst.
A method for preparing a catalyst for preparing 4-methyl-2-pentanol by hydrogenation of methyl isobutyl ketone can comprise the following steps:
(1) preparing powder: adding a required amount of soluble lanthanum salt into an aluminum sulfate solution, then sending the solution and a sodium metaaluminate solution into an pseudo-boehmite synthesis tank in a cocurrent manner, controlling the flow rate of the two solutions to ensure that the pH value of a reaction solution in the pseudo-boehmite synthesis tank is 6.5-8.0, then aging for 2 hours, filtering, washing and drying;
(2) and (3) carrier molding: preparing the pseudo-boehmite powder prepared in the step (1) into spherical particles by adopting a rolling ball method, or kneading and extruding the spherical particles into strips, processing the strips into various shapes, drying the strips, and roasting the strips for 2 to 6 hours at the temperature of 600 to 900 ℃ to obtain a carrier;
(3) the load component is as follows: dissolving soluble nickel salt, soluble lead salt and preferably soluble barium salt into mixed salt solution, spraying or dipping the mixed salt solution onto the carrier once or in several times, drying and decomposing the salt;
(4) reduction: the catalyst is reduced by hydrogen or a mixture of hydrogen and nitrogen at a programmed temperature, the maximum reduction temperature not exceeding 500 ℃.
The concentration and pH value of the aluminum sulfate solution and the sodium metaaluminate solution have no special requirements, the concentration and pH value which are usually used can meet the requirements of the invention on the carrier, and the key is that lanthanum salt is added and the addition amount of lanthanum is controlled when the aluminum sulfate solution raw material is prepared.
The pseudoboehmite can be prepared into spherical particles with the particle size of 2-6 mm by adopting a common method, a proper amount of peptizing agent and/or pore-expanding agent can be added, the strength of the spheres can be improved by adding the peptizing agent, and the pore volume and the pore diameter of the spheres can be improved by adding the pore-expanding agent. When the pseudo-boehmite is extruded into strips for forming, a rolling machine or a kneading machine and the like can be used for kneading, a small amount of organic or inorganic acid can be added in addition to water in the kneading process to improve peptization, and a proper amount of binder and/or pore-expanding agent can be added. The above-mentioned additives have no specific sequence, and can be determined by those skilled in the art according to the needs. After fully rolling or uniformly kneading, extruding and forming by a strip extruding machine, and selecting different dies to be made into clover, cylinder, tooth ball, hollow strip, hollow ball and other shapes. The prepared spherical particles or strip-shaped particles are dried and roasted at high temperature to prepare the alumina carrier, the temperature and time of the high-temperature roasting can be specifically adjusted according to the pore structure of the carrier required by reaction, generally, the roasting temperature is 500-900 ℃, and the roasting time is 2-6 h.
The soluble nickel salt is, for example, nickel nitrate, nickel chloride, nickel hydroxycarbonate, nickel formate, nickel acetate, or the like. Examples of the soluble lead salt include lead nitrate, lead acetate, and lead formate. Examples of the soluble barium salt include barium nitrate and barium acetate. The soluble lanthanum salt is, for example, lanthanum nitrate, lanthanum chloride, lanthanum sulfate, lanthanum acetate, etc.
When the component is supported, an equivalent impregnation method, an excess impregnation method, a spraying method may be used according to the condition of the catalyst processing equipment, and the component may be supported at one time or may be supported several times according to the supported amount and the solution concentration. When the components are loaded for several times, the components are dried each time, the salt is decomposed into oxides, and then the next component loading is carried out.
The catalyst of the present invention is reduced before use. When the catalyst is reduced, the mixed gas of hydrogen and nitrogen is generally used, the reduction temperature is better controlled, and temperature runaway is not easy to occur. If pure hydrogen reduction is used, the temperature rise rate needs to be strictly controlled and the temperature rises slowly. The supported component nickel and the like are reduced to be simple substances, the reducing gas can be hydrogen gas or a mixed gas of hydrogen gas and nitrogen gas, the content of the hydrogen gas in the mixed gas of hydrogen and nitrogen gas can be any content, for example, 2 vol% to 80 vol%, and gases with higher content can also be used. From the viewpoint of temperature control of catalyst reduction, a mixed gas having a low hydrogen content is preferred. The larger the space velocity of the gas, the better. The air speed is large, the heat generated by the reaction can be quickly removed in time, the temperature of the catalyst bed is kept stable, and the catalyst is not damaged by temperature runaway. For example, the space velocity of the mixed gas is 300-5000 m3/m3·h-1. The reduction temperature can be determined according to the composition of the specific catalyst, and for the catalyst provided by the invention, the temperature of a catalyst bed layer can be gradually increased at a speed of preferably 5-20 ℃/h, preferably 5-10 ℃/h, the catalyst stays at the temperature of about 200 ℃ for 2-8 hours, and then the temperature is increased at 5-20 ℃/h, preferably 5-10 ℃/hGradually increasing the temperature of the catalyst bed layer until the temperature reaches 420-480 ℃, and keeping the temperature for 4-6 hours. And then slowly cooling to room temperature, for example, the cooling rate is 5-20 ℃/h. After the temperature is reduced to the room temperature, the nitrogen is switched to the nitrogen, the hydrogen is gradually mixed into the nitrogen, and the hydrogen consumption is gradually increased to increase the hydrogen content in the mixed gas. The amount of hydrogen is adjusted at any time according to the change of the temperature of the catalyst, so that the temperature of a catalyst bed is prevented from being too high, for example, not exceeding 50 ℃. If the catalyst is reduced in situ in the reactor, the temperature of the reduced catalyst is reduced to the reaction temperature, and then the catalyst can be fed for use.
An application method of a catalyst for preparing 4-methyl-2-pentanol by hydrogenation of methyl isobutyl ketone comprises the steps of using a trickle fixed bed, loading the catalyst into a reactor, respectively preheating a methyl isobutyl ketone raw material and hydrogen, mixing, and feeding the mixture to the upper end of the reactor, wherein the mass ratio of the methyl isobutyl ketone to the hydrogen in feeding is 2: 1-8: 1, and the liquid hourly space velocity of the methyl isobutyl ketone is 0.1-1.0 h-1Carrying out hydrogenation reaction under the reaction pressure of 1.0-3.0 MPa and the reaction temperature of 110-160 ℃, and controlling the preheating temperature of the methyl isobutyl ketone and the hydrogen so that the liquid phase amount of the methyl isobutyl ketone accounts for 10-40% of the total amount of the methyl isobutyl ketone after the methyl isobutyl ketone and the hydrogen are mixed.
Hydrogenation of methyl isobutyl ketone (MIBK) produces 4-methyl-2-pentanol (MIBC) and the like. Under normal pressure, MIBK has a boiling point of 116 deg.C, MIBC has a boiling point of 132 deg.C, and a relatively high boiling point. According to the characteristic, the inventor finds that the MIBK part is kept in a liquid phase state in the catalyst bed layer to be more favorable for reaction through simulation software calculation and a plurality of times of experiments, on one hand, heavier components generated on the catalyst bed layer can be swept, on the other hand, the MIBK and the MIBC are in a gas-liquid equilibrium state under the reaction temperature and pressure, the heat of reaction can be removed through vaporization heat absorption, the temperature stability of the catalyst bed layer can be favorably kept, and the catalyst cannot generate an overheated hot spot.
In order to better highlight the advantages of the hydrogenation of methyl isobutyl ketone to 4-methyl-2-pentanol according to the present invention, a better process condition range is preferred, and the ratio of the amounts of methyl isobutyl ketone and hydrogen in the feed is particularly preferred3: 1-5: 1, and the liquid hourly space velocity of the methyl isobutyl ketone is 0.2-0.8 h-1Carrying out hydrogenation reaction under the reaction pressure of 1.5-2.5 MPa and the reaction temperature of 120-150 ℃, and controlling the preheating temperature of the methyl isobutyl ketone and the hydrogen so that the liquid phase amount of the methyl isobutyl ketone accounts for 10-30% of the total amount of the methyl isobutyl ketone after the methyl isobutyl ketone and the hydrogen are mixed.
The methyl isobutyl ketone is hydrogenated to generate the 4-methyl-2-pentanol, but when the catalyst or the process condition is not proper, some side reactions also occur, for example, the condensation of the methyl isobutyl ketone or the further hydrogenation of the condensation product to generate the heavy component, the intramolecular dehydration of the 4-methyl-2-pentanol to generate the carbon six-hydrocarbon, the chain breaking reaction of the molecular chain of the methyl isobutyl ketone and the 4-methyl-2-pentanol and the like also occur. These reactions may occur due to the nature of the catalyst itself or due to performance of some aspect, or may occur due to extreme process conditions. Therefore, the ideal effect can be achieved by selecting a multifunctional catalyst and moderate process conditions.
Compared with the methyl isobutyl ketone hydrogenation catalyst reported in the existing literature, the catalyst provided by the invention has the advantages of acidity, alkalinity and hydrogenation capability, and side reactions are minimized. Secondly, although the preparation process has know-how, the catalyst of the invention has reproducibility, and the preparation method of the invention can reproduce the effect of the catalyst of the invention. The catalyst and the hydrogenation process have wider operation windows, and a better hydrogenation effect can be found by combining simulation calculation.
Detailed Description
The present invention will be further described with reference to the following examples.
The starting materials used in the examples are all commercially available.
Example 1
(1) Preparing powder: 190g of lanthanum nitrate hexahydrate was added to a volume of 30L of 70g/L of an aqueous aluminum sulfate solution containing alumina, and the aluminum hydroxide was dissolved with an aqueous sodium hydroxide solution to prepare a sodium metaaluminate solution containing 68g/L of alumina, which was prepared in excess to adjust the pH of pseudo-boehmite synthesis therewith. Adding 3L of deionized water into a neutralization tank, heating to 70 ℃, co-currently injecting the prepared aluminum sulfate solution and a sodium metaaluminate solution into a synthesis tank, controlling the temperature in the neutralization tank to be 68-72 ℃, fixing the flow of the aluminum sulfate solution, adjusting the flow of the sodium metaaluminate solution to ensure that the pH value of reaction liquid in the synthesis tank is 6.8-7.2, stopping injecting the sodium metaaluminate solution when the aluminum sulfate solution is injected completely, then increasing the temperature to 88-90 ℃, aging for 2 hours, filtering, washing and drying;
(2) and (3) carrier molding: mixing 300g of pseudo-boehmite prepared in the step (1) and 9g of sesbania powder in a kneader, adding acid liquor prepared from 280g of water, 5g of nitric acid and 6g of citric acid, kneading for 20min, extruding into clover by using a strip extruding machine, drying at 120 ℃, and roasting at 800 ℃ for 4 hours to obtain a carrier;
(3) the load component is as follows: dissolving 40.9g of nickel nitrate and 1.8g of lead nitrate in 43ml of water, pouring 83g of the carrier obtained in the step (2) into a solution of the nickel nitrate and the lead nitrate, shaking uniformly, drying at 100 ℃ for 4 hours, and decomposing at 400 ℃ for 3 hours; dissolving 33.4g of nickel nitrate and 1.4g of lead nitrate in 44ml of water again, pouring the semi-finished product obtained by the first load component into the solution of the nickel nitrate and the lead nitrate, shaking up, drying at 100 ℃ for 4 hours, and decomposing at 400 ℃ for 3 hours;
(4) reduction: and (3) reducing the oxidation state catalyst obtained in the step (3) by using a mixed gas of 25 vol% of hydrogen and 75 vol% of nitrogen, wherein the reduction temperature rise rate is 100 ℃/h, the temperature stays for 2 hours when rising to 250 ℃, then rises to 430 ℃, stays for 5 hours at the temperature, and then the temperature is reduced to room temperature, so that the catalyst KC-1 is obtained.
Example 2
(1) Preparing powder: 515g of lanthanum nitrate hexahydrate was added to a volume of 30L of an aqueous aluminum sulfate solution containing 65g/L of alumina, and the alumina was dissolved with an aqueous sodium hydroxide solution to prepare a sodium metaaluminate solution containing 65g/L of alumina, which was prepared in excess to adjust the pH of pseudo-boehmite synthesis therewith. Adding 3L of deionized water into a neutralization tank, heating to 66 ℃, co-currently injecting the prepared aluminum sulfate solution and a sodium metaaluminate solution into a synthesis tank, controlling the temperature in the neutralization tank to be 65-68 ℃, fixing the flow of the aluminum sulfate solution, adjusting the flow of the sodium metaaluminate solution to ensure that the pH value of reaction liquid in the synthesis tank is 7.0-7.4, stopping injecting the sodium metaaluminate solution when the aluminum sulfate solution is injected completely, then increasing the temperature to 85-88 ℃, aging for 2 hours, filtering, washing and drying;
(2) and (3) carrier molding: mixing 300g of pseudo-boehmite prepared in the step (1) and 9g of sesbania powder in a kneader, adding acid liquor prepared from 280g of water, 5g of nitric acid and 6g of citric acid, kneading for 22min, extruding into clover by using a strip extruding machine, drying at 120 ℃, and roasting at 650 ℃ for 4 hours to obtain a carrier;
(3) the load component is as follows: dissolving 27.3g of nickel nitrate and 0.44g of lead nitrate in 53ml of water, pouring 90g of the carrier obtained in the step (2) into a solution of nickel nitrate and lead nitrate, shaking uniformly, drying at 110 ℃ for 4 hours, and decomposing at 380 ℃ for 3 hours; dissolving 22.3g of nickel nitrate and 0.36g of lead nitrate in 53ml of water again, pouring the semi-finished product obtained by the first loading component into the solution of the nickel nitrate and the lead nitrate, shaking up, drying at 110 ℃ for 4 hours, and decomposing at 380 ℃ for 3 hours;
(4) reduction: and (3) reducing the oxidation state catalyst obtained in the step (3) by using a mixed gas of 25 vol% of hydrogen and 75 vol% of nitrogen, wherein the reduction temperature rise rate is 100 ℃/h, the temperature stays for 2 hours when rising to 250 ℃, then rises to 430 ℃, stays for 5 hours at the temperature, and then the temperature is reduced to room temperature, so that the catalyst KC-2 is obtained.
Example 3
(1) Preparing powder: 275g of lanthanum nitrate hexahydrate was added to a volume of 30L of an aqueous aluminum sulfate solution containing 66g/L of alumina, and a sodium metaaluminate solution containing 72g/L of alumina was prepared by dissolving the alumina in an aqueous sodium hydroxide solution, and the sodium metaaluminate solution was prepared in excess to adjust the pH of pseudo-boehmite synthesis therewith. Adding 3L of deionized water into a neutralization tank, heating to 63 ℃, co-currently injecting the prepared aluminum sulfate solution and the sodium metaaluminate solution into a synthesis tank, controlling the temperature in the neutralization tank to be 63-66 ℃, fixing the flow of the aluminum sulfate solution, adjusting the flow of the sodium metaaluminate solution to ensure that the pH value of reaction liquid in the synthesis tank is 7.2-7.5, stopping injecting the sodium metaaluminate solution when the aluminum sulfate solution is injected completely, then increasing the temperature to 85-88 ℃, aging for 2 hours, filtering, washing and drying;
(2) and (3) carrier molding: mixing 300g of pseudo-boehmite prepared in the step (1) and 9g of sesbania powder in a kneader, adding acid liquor prepared from 280g of water, 5g of nitric acid and 6g of citric acid, kneading for 25min, extruding into clover by using a strip extruding machine, drying at 120 ℃, and roasting at 750 ℃ for 4 hours to obtain a carrier;
(3) the load component is as follows: carrying out first loading, namely dissolving 49.6g of nickel nitrate and 1.92g of lead nitrate in 32ml of water, pouring 72g of the carrier obtained in the step (2) into a solution of the nickel nitrate and the lead nitrate, shaking uniformly, drying at 110 ℃ for 4 hours, and decomposing at 380 ℃ for 3 hours; carrying out second loading, namely dissolving 43.4g of nickel nitrate and 1.68g of lead nitrate in 32ml of water, pouring a semi-finished product obtained by the first loading component into the solution of the nickel nitrate and the lead nitrate, shaking up, drying at 110 ℃ for 4 hours, and decomposing at 380 ℃ for 3 hours; the third load, 31g of nickel nitrate and 1.2g of lead nitrate are dissolved in 32ml of water, the semi-finished product obtained by the second load component is poured into the solution of nickel nitrate and lead nitrate, shaken evenly, dried for 4 hours at 110 ℃, and decomposed for 3 hours at 380 ℃;
(4) reduction: and (3) reducing the oxidation state catalyst obtained in the step (3) by using a mixed gas of 25 vol% of hydrogen and 75 vol% of nitrogen, wherein the reduction temperature rise rate is 100 ℃/h, the temperature stays for 2 hours when rising to 250 ℃, then rises to 450 ℃, stays for 5 hours at the temperature, and then the temperature is reduced to room temperature, so that the catalyst KC-3 is obtained.
Example 4
(1) Preparing powder: 440g of lanthanum nitrate hexahydrate was added to a volume of 30L of an aqueous aluminum sulfate solution containing 65g/L of alumina, and the aluminum hydroxide was dissolved with an aqueous sodium hydroxide solution to prepare a sodium metaaluminate solution containing 65g/L of alumina, which was prepared in excess to adjust the pH of pseudo-boehmite synthesis therewith. Adding 3L of deionized water into a neutralization tank, heating to 72 ℃, co-currently injecting the prepared aluminum sulfate solution and the sodium metaaluminate solution into a synthesis tank, controlling the temperature in the neutralization tank to be 72-74 ℃, fixing the flow of the aluminum sulfate solution, adjusting the flow of the sodium metaaluminate solution to ensure that the pH value of reaction liquid in the synthesis tank is 7.5-7.8, stopping injecting the sodium metaaluminate solution when the aluminum sulfate solution is injected completely, then increasing the temperature to 85-88 ℃, aging for 2 hours, filtering, washing and drying;
(2) and (3) carrier molding: mixing 300g of pseudo-boehmite prepared in the step (1) and 9g of sesbania powder in a kneader, adding acid liquor prepared from 300g of water, 7g of nitric acid and 6g of citric acid, kneading for 18min, extruding into clover by using a strip extruding machine, drying at 120 ℃, and roasting at 900 ℃ for 4 hours to obtain a carrier;
(3) the load component is as follows: dissolving 54.5g of nickel nitrate and 0.88g of lead nitrate in 36ml of water, pouring 79g of the carrier obtained in the step (2) into a solution of the nickel nitrate and the lead nitrate, shaking uniformly, drying at 90 ℃ for 4 hours, and decomposing at 350 ℃ for 3 hours; dissolving 44.6g of nickel nitrate and 0.72g of lead nitrate in 36ml of water again, pouring the semi-finished product obtained by the first load component into the solution of the nickel nitrate and the lead nitrate, shaking up, drying at 110 ℃ for 4 hours, and decomposing at 360 ℃ for 3 hours;
(4) reduction: and (3) reducing the oxidation state catalyst obtained in the step (3) by using a mixed gas of 50 vol% of hydrogen and 50 vol% of nitrogen, wherein the reduction temperature rise rate is 100 ℃/h, the temperature is raised to 250 ℃ and stays for 2 hours, then the temperature is raised to 460 ℃, the temperature stays for 5 hours, and then the temperature is reduced to room temperature, so that the catalyst KC-4 is obtained.
Example 5
The support was prepared using example 1 and the components were loaded. The reduction method was carried out in the same manner as in example 1. The loading steps are as follows:
dissolving 40.9g of nickel nitrate, 1.76g of lead nitrate and 2.09g of barium nitrate in 42ml of water, pouring 81g of the carrier obtained in the step (2) into a salt solution, shaking up, drying at 100 ℃ for 4 hours, and decomposing at 370 ℃ for 4 hours; 33.4g of nickel nitrate, 1.44g of lead nitrate and 1.71g of barium nitrate were again dissolved in 42ml of water, and the semifinished product obtained from the first loading of the components was poured into this solution of nickel nitrate and lead nitrate, shaken up, then dried at 110 ℃ for 4 hours and decomposed at 360 ℃ for 5 hours.
The catalyst obtained is designated KC-5.
Example 6
The support was prepared using example 1 and the components were loaded. The reduction method was carried out in the same manner as in example 1. The loading steps are as follows:
dissolving 40.9g of nickel nitrate, 1.76g of lead nitrate and 5.23g of barium nitrate in 40ml of water, pouring 78g of the carrier obtained in the step (2) into a salt solution, shaking up, drying at 100 ℃ for 4 hours, and decomposing at 370 ℃ for 4 hours; 33.4g of nickel nitrate, 1.44g of lead nitrate and 4.28g of barium nitrate were again dissolved in 40ml of water, and the semifinished product obtained from the first loading of the components was poured into this solution of nickel nitrate and lead nitrate, shaken up, then dried at 110 ℃ for 4 hours and decomposed at 360 ℃ for 5 hours.
The catalyst obtained is designated KC-6.
TABLE 1 catalyst component content
| Catalyst and process for preparing same | Nickel/wt.% | Lead wt.% | Barium wt.% | Alumina wt% | Lanthanum wt% in alumina |
| KC-1 | 15 | 2 | 0 | 83 | 1.58 |
| KC-2 | 10 | 0.5 | 0 | 89.5 | 4.47 |
| KC-3 | 25 | 3 | 0 | 72 | 2.36 |
| KC-4 | 20 | 1 | 0 | 79 | 3.76 |
| KC-5 | 15 | 2 | 2 | 81 | 1.58 |
| KC-6 | 15 | 2 | 5 | 78 | 1.58 |
Examples 7 to 12
This example illustrates the application of the catalysts prepared in examples 1-6 in a hydrogenation reaction of methyl isobutyl ketone.
Filling a catalyst in a trickle bed reactor, metering methyl isobutyl ketone into a preheater of the trickle bed reactor through a metering pump, controlling and metering hydrogen into the hydrogen preheater through a gas mass flow meter, mixing the methyl isobutyl ketone and the hydrogen and feeding the mixture into the upper end of the reactor to enter a catalyst bed layer for hydrogenation reaction, wherein the reaction conditions are as follows: the reaction temperature is 130 ℃, the reaction pressure is 1.7MPa, and the space velocity is 0.5h-1The mass ratio of hydrogen to acetone was 6:1, and the liquid phase amount of methyl isobutyl ketone after mixing methyl isobutyl ketone with hydrogen was 23.6%. The test results are shown in Table 2.
Example 13
The procedure of example 7 was followed to carry out the hydrogenation of methyl isobutyl ketone while changing the reaction temperature to 110 ℃ and the reaction pressure to 0.8MPa, in which the liquid phase ratio of methyl isobutyl ketone after mixing the methyl isobutyl ketone with hydrogen gas was 11.0%. The test results are shown in Table 2.
Example 14
A hydrogenation of methyl isobutyl ketone was carried out as in example 7, except that the reaction temperature was changed to 120 ℃ and the reaction pressure was changed to 1.2MPa, at which time the liquid phase ratio of methyl isobutyl ketone after mixing methyl isobutyl ketone with hydrogen gas was 15.2%. The test results are shown in Table 2.
Example 15
A hydrogenation of methyl isobutyl ketone was carried out as in example 7, except that the reaction temperature was changed to 140 ℃ and the reaction pressure was changed to 2.1MPa, at which the liquid phase ratio of methyl isobutyl ketone after mixing methyl isobutyl ketone with hydrogen gas was 20.7%. The test results are shown in Table 2.
Example 16
A hydrogenation of methyl isobutyl ketone was carried out as in example 7, except that the reaction temperature was changed to 150 ℃ and the reaction pressure was changed to 2.8MPa, at which the liquid phase ratio of methyl isobutyl ketone after mixing methyl isobutyl ketone with hydrogen gas was 24.5%. The test results are shown in Table 2.
Example 17
A hydrogenation of methyl isobutyl ketone was carried out as in example 7, except that the reaction temperature was changed to 160 ℃ and the reaction pressure was changed to 3MPa, at which time the liquid phase ratio of methyl isobutyl ketone after mixing the methyl isobutyl ketone with hydrogen gas was 26.9%. The test results are shown in Table 2.
Example 18
The procedure of example 7 was followed to carry out the hydrogenation of methyl isobutyl ketone while changing the reaction temperature to 160 deg.C, the reaction pressure to 2.0MPa, and the liquid hourly space velocity of methyl isobutyl ketone to 0.8h-1The molar ratio of hydrogen to methyl isobutyl ketone was 3:1, and the liquid phase amount of methyl isobutyl ketone was 19.5% after mixing methyl isobutyl ketone and hydrogen. The test results are shown in Table 2.
Example 19
The procedure of example 7 was followed to carry out the hydrogenation of methyl isobutyl ketone while changing the reaction temperature to 160 deg.C, the reaction pressure to 1.2MPa, and the liquid hourly space velocity of methyl isobutyl ketone to 0.2h-1The molar ratio of hydrogen to methyl isobutyl ketone was 2:1, in which case the liquid phase ratio of methyl isobutyl ketone after mixing with hydrogen was 16.9%. The test results are shown in Table 2.
TABLE 2 hydrogenation test results
Example 20
This example examines the stability of the catalyst.
When the catalyst KC-1 is selected and the methyl isobutyl ketone hydrogenation reaction is carried out as in example 7, and the evaluation test is carried out for 1000 hours, the activity and the selectivity of the catalyst are not obviously changed.
Claims (9)
1. A methyl isobutyl ketone low temperature hydrogenation catalyst, characterized in that the catalyst comprises:
measured by taking the total weight of the catalyst as 100 parts,
10-25 parts of nickel;
0.5-3 parts of lead;
72-89.5 parts of lanthanum modified alumina carrier;
the content of lanthanum in the carrier is 1-5 wt%.
2. The methylisobutylketone low temperature hydrogenation catalyst of claim 1 wherein:
measured by taking the total weight of the catalyst as 100 parts,
12-20 parts of nickel;
0.8-2 parts of lead;
78-87.2 parts of lanthanum-modified alumina carrier;
the content of lanthanum in the carrier is 1.5-4.5 wt%.
3. The methylisobutylketone low temperature hydrogenation catalyst of claim 2 wherein:
measured by taking the total weight of the catalyst as 100 parts,
12-20 parts of nickel;
0.8-2 parts of lead;
0.5-5 parts of barium;
73-86.7 parts of lanthanum modified alumina carrier.
4. The methylisobutylketone low temperature hydrogenation catalyst of claim 1 wherein:
the lanthanum-modified alumina carrier is prepared by adding soluble lanthanum salt in the process of preparing pseudo-boehmite powder to obtain pseudo-boehmite containing lanthanum, and then forming into a carrier.
5. The methylisobutylketone low temperature hydrogenation catalyst of claim 4 wherein:
the preparation method of the lanthanum-modified alumina carrier comprises the following steps:
adding soluble lanthanum salt into an aluminum sulfate solution, feeding the soluble lanthanum salt and a sodium metaaluminate solution into a pseudo-boehmite synthesis tank in a cocurrent flow manner, controlling the flow rate of the two solutions to enable the pH value of a reaction solution in the pseudo-boehmite synthesis tank to be 6.5-8.0, and then aging, filtering, washing, drying and roasting to obtain the lanthanum-modified alumina carrier.
6. A method for preparing a methyl isobutyl ketone low temperature hydrogenation catalyst according to any one of claims 1 to 5, comprising:
(1) the load component is as follows: dissolving soluble nickel salt and lead salt or soluble nickel salt, lead salt and barium salt into mixed salt solution, spraying or dipping the mixed salt solution on a carrier, drying and decomposing the salt;
(2) reduction: the catalyst is reduced with hydrogen or a mixture of hydrogen and nitrogen.
7. The process for preparing a methylisobutylketone low temperature hydrogenation catalyst of claim 6, wherein:
and (2) reducing at a temperature not exceeding 500 ℃.
8. Use of a methylisobutylketone low temperature hydrogenation catalyst according to any one of claims 1 to 5, wherein:
the catalyst is loaded in a reactor, a methyl isobutyl ketone raw material and hydrogen are respectively preheated and then mixed and are fed into the upper end of the reactor, the mass ratio of the methyl isobutyl ketone to the hydrogen is 2: 1-8: 1 during feeding, and the liquid hourly space velocity of the methyl isobutyl ketone is 0.1-1.0 h-1Carrying out hydrogenation reaction at a reaction pressure of 1.0-3.0 MPa and a reaction temperature of 110-160 ℃;
the preheating temperature of the methyl isobutyl ketone and the hydrogen is controlled so that the liquid phase amount of the methyl isobutyl ketone accounts for 10 to 40 percent of the total amount of the methyl isobutyl ketone and the hydrogen after the methyl isobutyl ketone and the hydrogen are mixed.
9. The use of a methylisobutylketone low temperature hydrogenation catalyst as claimed in claim 8, wherein:
the mass ratio of the methyl isobutyl ketone to the hydrogen in the feeding process is 3: 1-5: 1, and the liquid hourly space velocity of the methyl isobutyl ketone is 0.2-0.8 h-1Carrying out hydrogenation reaction at a reaction pressure of 1.5-2.5 MPa and a reaction temperature of 120-150 ℃;
the liquid phase amount of the methyl isobutyl ketone accounts for 10 to 30 percent of the total amount of the methyl isobutyl ketone and the hydrogen after the methyl isobutyl ketone and the hydrogen are mixed.
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