CN107866218B - Catalyst applied to preparation of 1, 4-diacetoxybutane - Google Patents

Abstract

The invention relates to a catalyst applied to preparation of 1, 4-diacetoxybutane, mainly solve the problem that the yield and selectivity of 1, 4-diacetoxybutane are low in the prior art, adopt the catalyst applied to preparation of 1, 4-diacetoxybutane, including carrier and active component, the said carrier is activated carbon, the active component includes Pt element and cocatalyst element, the said cocatalyst element includes the technical scheme of at least a kind of metallic element selected from VB metal, has solved the technical problem well, can be used in the industrial production of 1, 4-diacetoxybutane.

Description

Catalyst applied to preparation of 1, 4-diacetoxybutane

Technical Field

The invention relates to a catalyst applied to preparation of 1, 4-diacetoxybutane.

Background

1,4-butanediol (1,4-BDO) is an important organic and fine chemical raw material and is widely applied to the fields of medicine, chemical industry, textile, papermaking, automobile, daily chemical industry and the like. It can derive a series of fine chemical products with high added value. For example, Tetrahydrofuran (THF), polybutylene terephthalate (PBT), gamma-butyrolactone (GBL) and polyurethane resins (PU Resin) can be produced from 1,4-BDO, and have received extensive attention from research institutes, particularly as a basic raw material for the production of PBT engineering plastics and PBT fibers.

The technical barriers are high and the raw material sources are limited, the global 1,4-BDO production is relatively centralized in 2011, the global 1,4-BDO production is mainly distributed in Asia, America and Europe, wherein the ratio of the Asia 1,4-BDO production to the ratio reaches 56.6 percentIs used as raw material and is hydrogenated in two steps. In the first step, maleic anhydride is hydrogenated to generate gamma-butyrolactone and tetrahydrofuran under the action of a Ni-Re catalyst; second step of gamma-butyrolactone in Mo-Cr-K₂The main process of the method is mainly a two-stage hydrogenation process developed by using a Japanese dittany oil method and a Mitsubishi formation method, ③ a propylene method mainly comprises an allyl acetate method, an acrolein method and an allyl alcohol method, the allyl alcohol method developed by the Japanese Coly company is industrially applied at present, the method comprises the steps of performing liquid-phase hydroformylation on allyl alcohol to generate 4-hydroxybutyraldehyde under the action of a rhodium catalyst, and then performing hydrogenation to generate 1,4-butanediol ④ a butadiene method, and the method for producing the 1,4-BDO by using butadiene as a raw material mainly comprises a butadiene acetoxylation method and a butadiene chlorination method, the main process of the method is developed by the Japanese mitsubishi formation and Caoda company in 80 years of the 20 th century, the technical barrier and obstacle of the Reppe method are successfully broken, particularly the advantages and the prospects of the butadiene acetoxylation method, and the favor of research institutions at home and abroad is obtained.

As is well known, the butadiene acetoxylation method is a three-step process, namely firstly, butadiene is subjected to acetylation reaction with acetic acid and oxygen to generate 1, 4-diacetoxybutene and a byproduct of 3, 4-diacetoxybutene; then the 1, 4-diacetoxybutene is catalyzed and hydrogenated to generate the 1, 4-diene acetoxy butane, and finally hydrolysis reaction is carried out to obtain the 1, 4-BDO. In a 1, 4-butadiene to 1,4-butanediol process route in which 1, 4-diacetoxybutene is catalytically hydrogenated to 1, 4-diene acetoxybutane as one of the steps, the yield and selectivity of the hydrogenated product directly affects the yield and selectivity of 1,4-butanediol relative to 1, 4-butadiene.

U.S. Pat. No. 4032458(production of 1,4-butane diol) teaches the production of 1,4-butanediol using furan in the presence of a catalyst under certain conditions of temperature and pressure. Patent CN94108094.3 (process for preparing 1,4-butanediol) describes the preparation of 1,4-butanediol by gas phase catalytic hydrogenation reaction using maleic anhydride as raw material in the presence of a specifically designed catalyst. Patent CN104326871A (a preparation method of butanediol) describes that 2-butene with a content of more than 99% is mixed with acetic acid, nitrogen, oxygen and water vapor at a high temperature and then introduced into a fixed bed by using a fixed bed catalytic technology, and 1,4-butanediol is prepared under the conditions of a catalyst, a certain temperature and a certain pressure, and the like. However, the methods have the problems of low yield and low selectivity of the 1,4-BDO in the process of preparing the 1, 4-BDO.

Disclosure of Invention

One of the technical problems to be solved by the invention is the problem that the yield and the selectivity of 1, 4-diacetoxybutane are low, and a novel catalyst applied to the preparation of 1, 4-diacetoxybutane is provided, and the catalyst has the characteristics of high yield and high selectivity of 1, 4-diacetoxybutane.

The second technical problem to be solved by the invention is the preparation method of the hydrogenation catalyst.

The invention also provides a synthesis method of 1, 4-diacetoxybutane by using the hydrogenation catalyst.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the catalyst applied to the preparation of the 1, 4-diacetoxybutane comprises a carrier and an active component, wherein the carrier is activated carbon, the active component comprises a Pt element and a promoter element, and the promoter element is selected from at least one metal element in VB group metals.

In the technical scheme, the activated carbon is preferably at least one of coal columnar carbon, coconut shell activated carbon, apricot shell activated carbon and bamboo activated carbon.

In the technical scheme, the specific surface area of the activated carbon is preferably 1000-1500 cm²The preferred adsorption pore volume is 0.60-1.00 cm/g³/g。

In the above-mentioned embodiment, the group VB metal in the catalyst is preferably at least one selected from the group consisting of V, Nb and Ta. Further comprising V and Nb which have synergistic effects in increasing the yield of 1, 4-diacetoxybutane and the selectivity of 1, 4-diacetoxybutane.

In the above technical solution, the promoter element may further include at least one metal element of group IIIA metal elements. At this time, the group IIIA metal element and the group VB metal element have synergistic effect in improving the yield of the 1, 4-diacetoxybutane and the selectivity of the 1, 4-diacetoxybutane. By way of non-limiting example, such as but not limited to gallium in combination with niobium, indium in combination with niobium, and the like.

In the above technical solution, the group IIIA metal In the catalyst is preferably at least one selected from Al, Ga and In, and more preferably includes In and Ga at the same time. In and Ga have synergistic effects In improving the yield of 1, 4-diacetoxybutane and the selectivity of 1, 4-diacetoxybutane.

In the technical scheme, the content of Pt in the catalyst is preferably 1.00-8.60 g/L, and more preferably 1.50-5.00 g/L.

In the technical scheme, the content of the promoter element in the catalyst is preferably 0.50-10.00 g/L, and more preferably 1.00-6.00 g/L.

To solve the second technical problem, the technical solution of the present invention is as follows:

the catalyst preparation process according to any of the preceding technical solutions, comprising the steps of:

① mixing the solution containing platinum element with the carrier according to the composition of the catalyst to obtain a catalyst precursor I;

② aging the catalyst precursor I to obtain a catalyst precursor II;

③ reducing the combined platinum element in the catalyst precursor II into simple substance platinum to obtain a catalyst precursor III;

④ washing with water, drying to obtain catalyst precursor IV;

⑤ according to the composition of the catalyst, the solution containing the promoter element is loaded on the catalyst precursor IV by adopting an impregnation method, and the catalyst is obtained by drying.

In the above embodiment, the specific compound corresponding to the platinum element in step ① is preferably at least one compound selected from the group consisting of platinum acetate, platinum chloride, ammonium chloroplatinate, dinitrosoplatinate, chloroplatinic acid and tetraammineplatinate, and more preferably ammonium chloroplatinate, by way of non-limiting example.

In the above technical solution, as a non-limiting example, the promoter element in step ⑤ includes a specific compound corresponding to a group VB metal element, which is preferably at least one selected from vanadium trichloride, ammonium metavanadate, vanadium acetate, vanadium pentoxide, niobium pentachloride, niobium oxalate, niobium acetate, tantalum acetate, and tantalum pentachloride, and more preferably at least one selected from niobium oxalate and ammonium metavanadate.

In the above-mentioned technical solution, as a non-limiting example, when the promoter element in step ⑤ further includes a group IIIA metal element, a specific compound corresponding to the group IIIA metal element is preferably at least one selected from the group consisting of aluminum chloride, aluminum sulfate, aluminum acetate, aluminum nitrate, aluminum oxide, gallium nitrate, gallium chloride, gallium acetate, indium chloride, indium sulfate, indium nitrate and indium acetate, and more preferably at least one selected from the group consisting of gallium nitrate and indium acetate.

In the technical scheme, based on the understanding of a person skilled in the art that the reducing agent in the step ③ is not particularly required, the reducing agent can be gas or liquid, the reducing agent is preferably at least one of hydrogen and hydrazine hydrate, the drying temperature in the step ④ is preferably 30-120 ℃, the drying time is preferably 1-5 hours, and the drying temperature in the step ⑤ is preferably 80-120 ℃, and more preferably 100-120 ℃.

To solve the third technical problem, the technical scheme of the invention is as follows:

a method for synthesizing 1, 4-diacetoxybutane, in the presence of the catalyst in any of the technical schemes of the technical problems, hydrogen and 1, 4-diacetoxybutene are subjected to hydrogenation reaction to obtain the 1, 4-diacetoxybutane.

The key to the invention is the selection of the catalyst, and the skilled person knows how to determine the appropriate hydrogenation process conditions such as reaction temperature, reaction time, reaction pressure and feed ratio according to actual needs. However:

in the technical scheme, the temperature of the hydrogenation reaction is preferably 20-120 ℃.

In the above technical scheme, the pressure of the hydrogenation reaction is preferably 1.0-10.0 MPa, and more preferably 1.0-6.0 MPa.

In the technical scheme, the time of the hydrogenation reaction is preferably 0.5-5.0 h, and more preferably 0.5-2.0 h.

1, 4-diacetoxybutene is commercially available or can be synthesized by butadiene oxyacetylation. The butadiene oxyacetylation method can select Pd-Te/C as butadiene oxyacetylation catalyst. The content of palladium element in the suitable Pd-Te/C catalyst is preferably 2.50-5.00 g/L, and more preferably 3.00-4.50 g/L; the content of tellurium is preferably 0.50 to 3.00g/L, more preferably 1.00 to 2.50 g/L. The suitable temperature of the oxyacetylation reaction is preferably 40-150 ℃; the pressure of the oxyacetylation reaction is preferably 1.0-10.0 MPa; the preferred time of the oxyacetylation reaction is 0.5-5 h; the molar ratio of butadiene to acetic acid is preferably 0.010-2.0. After the butadiene is subjected to the butadiene oxyacetylation reaction, the mixture of the butadiene oxyacetylation reaction can be separated to obtain the target product 1, 4-diacetoxybutene, and then the hydrogenation reaction is carried out, or the hydrogenation reaction can be directly carried out without separating. However, in order to eliminate other impurities to cause system complexity and facilitate the same proportion, the section of the embodiment of the invention adopts pure 1, 4-diacetyloxybutene as the hydrogenation reaction raw material.

The product mixture of the hydrogenation reaction can be separated to obtain the target product 1, 4-diacetyloxybutane.

The 1, 4-diacetoxybutane can be further used to obtain 1,4-butanediol by a hydrolysis process. The selection of an appropriate hydrolysis catalyst and the determination of an appropriate hydrolysis reaction temperature, time and feed ratio are well known to those skilled in the art. The hydrolysis catalysts which are commonly used may be inorganic acids, inorganic bases, organic acids and organic bases. Such as hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, sodium hydroxide, potassium hydroxide, benzenesulfonic acid, and ion exchange resins. The appropriate hydrolysis reaction temperature is preferably 30-100 ℃; the hydrolysis reaction pressure is preferably 0-2.0 MPa; the solvent is preferably water.

The product mixture after hydrogenation reaction is analyzed by a gas chromatography-MASS spectrometer (GC-MASS), and the yield and selectivity of 1, 4-diacetoxybutane are calculated according to the following formula:

compared with the prior art, the key point of the invention is that the new hydrogenation catalyst adopted in the step (2) improves the yield and the selectivity of the 1, 4-diacetoxybutane.

Experimental results show that when the method is adopted, the yield of the 1, 4-diacetyloxy butane is over 82 percent, the selectivity is over 93 percent, and a better technical effect is achieved. Especially, when the active component of the hydrogenation catalyst simultaneously comprises platinum, at least one metal element selected from IIIA group metals and at least one metal element selected from VB group metals, more outstanding technical effects are achieved, and the hydrogenation catalyst can be used in the industrial production of 1, 4-butanediol. The invention is further illustrated by the following examples.

Detailed Description

[ example 1 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ indium acetate (In (OAc) containing 1.90g of In₃·6H₂O) was impregnated on the catalyst precursor IV in 180ml of an aqueous solution and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the In content was determined to be 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was analytically calculated to be 82.45% and the selectivity was 93.96%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 2 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ niobium oxalate containing 1.90g Nb ((C)₂HO₄)₅Nb·6H₂O) was sufficiently dissolved in an aqueous solution of acetic acid having a concentration of 30% by weight to obtain 180ml of an impregnation solution, which was then impregnated on the catalyst precursor IV and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the Nb content was determined to be 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

step (2): adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 82.39% and the selectivity was 94.09%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amounts, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ COMPARATIVE EXAMPLE 1 ]

Are comparative examples of [ example 1 ] and [ example 2 ].

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying for 4 hours at 50 ℃ to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was analytically calculated to be 75.19% and the selectivity was 91.34%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

Compared with the examples 1-2, the catalyst adopting hydrogenation has the advantages that the catalyst containing Pt and In as active components and Pt and Nb as active components has better performance than the catalyst containing Pt as active components, and the catalyst containing Pt and Nb as active components is favorable for improving the activity and stability of the hydrogenation catalyst and has high yield and selectivity of 1, 4-diacetoxybutane.

[ COMPARATIVE EXAMPLE 2 ]

Comparative example [ comparative example 1 ].

Preparation of hydrogenation catalyst:

① ammonium chloropalladite containing 2.05g Pd ((NH)₄)₂PdCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying for 4 hours at 50 ℃ to obtain the catalyst.

The Pd content of the catalyst was determined by ICP to be 2.05 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 70.07% and the selectivity was 88.16%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amounts, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

Compared with the comparative example 1, the catalyst adopting hydrogenation has better performance than the catalyst containing Pd active component, which shows that the hydrogenation catalyst uses Pt as the active component to favor the hydrogenation of 1, 4-diacetoxybutene and the yield and the selectivity of 1, 4-diacetoxybutane are high.

[ example 3 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ ammonium metavanadate (NH) containing 1.90g V₄VO₃) Is impregnated on the catalyst precursor IV, and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the V content 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 82.37% and the selectivity was 94.08%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amounts, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 4 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.60cm³Per g, specific surface area 1000cm²Soaking a coconut shell cylindrical activated carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ vanadium acetate (V (OAc)) containing 1.90g V₃) Fully dissolved in acetic acid water solution with the concentration of 30 wt% to obtain impregnation liquid 180ml, impregnated on the catalyst precursor IV, 100 ℃ drying for 4 hours, get the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the V content 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was found to be 82.32% by analysis, and the selectivity was found to be 94.11%, and for convenience of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amount, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 5 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm and pore volume of 1.00cm³Per g, specific surface area 1500cm²Soaking the apricot shell cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ niobium acetate (Nb (OAc) containing 1.90g Nb₅) Fully dissolved in acetic acid water solution with the concentration of 30 wt% to obtain impregnation liquid 180ml, impregnated on the catalyst precursor IV, 120 ℃ drying for 4 hours, get the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the Nb content was determined to be 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 82.43% and the selectivity was 93.98%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amounts, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 6 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a bamboo cylindrical activated carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ aluminum acetate (Al (OAc) containing 1.90g of Al₃·6H₂O) 180ml of an aqueous solution, was impregnated on the catalyst precursor IV, and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the Al content was determined to be 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 82.41% and the selectivity was 93.87%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amounts, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 7 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ gallium nitrate (Ga (NO) containing 1.90g Ga₃)₃·8H₂O) 180ml of an aqueous solution, was impregnated on the catalyst precursor IV, and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 2.05g/L and the Ga content was 1.90 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 50 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was analytically calculated to be 82.50% and the selectivity was 93.99%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 8 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 1.50g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ aluminum nitrate (Al (NO) containing 1.00g of Al₃)₃) 180ml of an aqueous solution was immersed in the catalyst precursor IV, and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was 1.50g/L and the Al content was 1.00g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 0.5MPa, introducing hydrogen until the pressure is 1.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 20 ℃, continuously reacting for 30min, and stopping the reaction. Cooling the reaction kettle to room temperature, and purifying to remove impurities to obtain the 1, 4-diacetyloxy butane.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 80.63% and the selectivity 93.74%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 9 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 5.00g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ indium nitrate (In (NO) containing 6.00g of In₃)₃·4.5H₂O) 180ml of an aqueous solution, was impregnated on the catalyst precursor IV, and dried at 110 ℃ for 4 hours to obtain the catalyst.

The Pt content of the catalyst was determined by ICP to be 5.00g/L and the In content was determined to be 6.00 g/L.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 6.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 120 ℃, continuously reacting for 120min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 82.89% and the selectivity 93.75%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 10 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ indium acetate (In (OAc) containing 1.18g of In and 0.72g of Ga₃·6H₂O) and gallium nitrate (Ga (NO)₃)₃·8H₂O) was impregnated on the catalyst precursor IV in 180ml of an aqueous solution and dried at 110 ℃ for 4 hours to obtain the catalyst.

The catalyst had a Pt content of 2.05g/L, an In content of 1.18g/L and a Ga content of 0.72g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was found to be 83.55% by analysis, the selectivity was found to be 94.36%, and the preparation of the hydrogenation catalyst, the reaction conditions, the feed of the materials, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively, for convenience of illustration and comparison.

From example 10, In comparison with examples 1 and 7, it can be seen that the metal element In and Ga In the group IIIA metal of the hydrogenation catalyst used In the present invention have a better synergistic effect In increasing the yield and selectivity of 1, 4-diacetoxybutane.

[ example 11 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ niobium oxalate containing 1.25g Nb and 0.65g V ((C)₂HO₄)₅Nb·6H₂O) and ammonium metavanadate (NH)₄VO₃) Fully dissolved in acetic acid water solution with the concentration of 30 wt% to obtain 180ml of impregnation liquid, impregnated on the catalyst precursor IV, and dried for 4 hours at 110 ℃ to obtain the catalyst.

The catalyst had a Pt content of 2.05g/L, a Nb content of 1.25g/L and a V content of 0.65g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was found to be 83.42% by analysis, and the selectivity was found to be 94.49%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, and the yield and selectivity of 1, 4-diacetoxybutane were shown in tables 1 and 2, respectively.

As can be seen from the comparison between example 11 and examples 2 and 3, in the hydrogenation catalyst used in the present invention, Nb, which is a metal of group VB, has a good synergistic effect with V, in terms of improving the yield and selectivity of 1, 4-diacetoxybutane.

[ example 12 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ indium acetate (In (OAc) containing 1.05g of In and 0.85g of Nb₃·6H₂O) and niobium oxalate ((C)₂HO₄)₅Nb·6H₂O) was sufficiently dissolved in an aqueous solution of acetic acid having a concentration of 30% by weight to obtain 180ml of an impregnation solution, which was impregnated on the catalyst precursor IV and dried at 110 ℃ for 4 hours to obtain the catalyst.

The catalyst had a Pt content of 2.05g/L, an In content of 1.05g/L and an Nb content of 0.85g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was found to be 84.62% by analysis, and the selectivity was found to be 95.19%, and for convenience of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amount, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

As can be seen from the comparison between example 12 and examples 1 and 2, the hydrogenation catalyst used In the present invention has a good synergistic effect of the metal element In the group IIIA metal and the metal element Nb In the group VB metal In terms of improving the yield and selectivity of 1, 4-diacetoxybutane.

[ example 13 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ gallium nitrate (Ga (NO) containing 1.05g Ga and 0.85g Nb₃)₃·8H₂O) and niobium oxalate ((C)₂HO₄)₅Nb·6H₂O) was sufficiently dissolved in an aqueous solution of acetic acid having a concentration of 30% by weight to obtain 180ml of an impregnation solution, which was impregnated on the catalyst precursor IV and dried at 110 ℃ for 4 hours to obtain the catalyst.

The catalyst had a Pt content of 2.05g/L, a Ga content of 1.05g/L and a Nb content of 0.85g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was found to be 84.71% by analysis, the selectivity was found to be 95.03%, and the preparation of the hydrogenation catalyst, the reaction conditions, the feed of the materials, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively, for convenience of illustration and comparison.

As can be seen from the comparison between example 13 and examples 2 and 7, the hydrogenation catalyst used in the present invention has a good synergistic effect of the metal element Ga in the group IIIA metal and the metal element Nb in the group VB metal in terms of improving the yield and selectivity of 1, 4-diacetoxybutane.

[ example 14 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ will contain 0.65g In, 0.40g Ga and 0.85g NIndium acetate (in (OAc) of b₃·6H₂O), gallium nitrate (Ga (NO)₃)₃·8H₂O) and niobium oxalate ((C)₂HO₄)₅Nb·6H₂O) was sufficiently dissolved in an aqueous solution of acetic acid having a concentration of 30% by weight to obtain 180ml of an impregnation solution, which was impregnated on the catalyst precursor IV and dried at 110 ℃ for 4 hours to obtain the catalyst.

The catalyst had a Pt content of 2.05g/L, an In content of 0.65g/L, a Ga content of 0.40g/L and a Nb content of 0.85g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was calculated analytically to be 85.28% and the selectivity was 95.42%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amounts, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

As can be seen from the comparison between example 14 and examples 12 and 13, the hydrogenation catalyst used In the present invention has a good synergistic effect of the metal elements In, Ga and Nb In the metals of groups IIIA, VB In increasing the yield and selectivity of 1, 4-diacetoxybutane.

[ example 15 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ In (In (OAc)) containing 0.65g of In, Ga (0.40 g) and indium acetate (In (OAc)) containing 0.85g V₃·6H₂O), gallium nitrate (Ga (NO)₃)₃·8H₂O) and ammonium metavanadate (NH)₄VO₃) Is impregnated on the catalyst precursor IV, and dried at 110 ℃ for 4 hours to obtain the catalyst.

The catalyst had a Pt content of 2.05g/L, an In content of 0.65g/L, a Ga content of 0.40g/L and a V content of 0.85g/L as determined by ICP.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was found to be 85.33% by analysis and the selectivity was found to be 95.34%, and for convenience of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed amount, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

[ example 16 ]

Preparation of hydrogenation catalyst:

① ammonium chloroplatinite ((NH) containing 2.05g Pt₄)₂PtCl₄) Dissolving in 8 wt% hydrochloric acid aqueous solution to obtain 200ml of impregnation solution, and mixing 1L of solution with diameter of 3mm, length of 2cm, and pore volume of 0.80cm³A specific surface area of 1200 cm/g²Soaking a coal cylindrical active carbon carrier in the soaking solution to obtain a catalyst precursor I;

② standing and aging for 24h to obtain a catalyst precursor II;

③ the concentration is 8% (by N)₂H₄·H₂O weight ratio) of 500ml of hydrazine hydrate is used for reducing the catalyst precursor II for 3h to obtain a catalyst precursor III;

④, washing with water until no chloride ion exists, and drying at 50 ℃ for 4 hours to obtain a catalyst precursor IV;

⑤ indium acetate (In (OAc) containing 0.65g of In, 0.40g of Ga, 0.31g V and 0.54g of Nb₃·6H₂O), gallium nitrate (Ga (NO)₃)₃·8H₂O), ammonium metavanadate (NH)₄VO₃) And niobium oxalate ((C)₂HO₄)₅Nb·6H₂O) was sufficiently dissolved in an aqueous solution of acetic acid having a concentration of 30% by weight to obtain 180ml of an impregnation solution, which was impregnated on the catalyst precursor IV and dried at 110 ℃ for 4 hours to obtain the catalyst.

The catalyst has a Pt content of 2.05g/L, an In content of 0.65g/L, a Ga content of 0.40g/L, a V content of 0.31g/L and an Nb content of 0.54g/L through ICP determination.

1, 4-diacetoxybutene hydrogenation:

adding 15ml of 1, 4-diacetoxybutene, 30ml of toluene and 0.01mol of hydrogenation catalyst into a 100ml titanium reaction kettle, discharging air in the kettle by using argon, pressurizing to 1.0MPa, introducing hydrogen until the pressure is 3.0MPa, increasing the stirring speed to 600rpm, stirring, heating to the reaction temperature, controlling the reaction temperature to be 60 ℃, continuously reacting for 90min, and stopping the reaction.

The yield of 1, 4-diacetoxybutane was analytically calculated to be 86.59% and the selectivity was 95.62%, and for ease of illustration and comparison, the preparation of the hydrogenation catalyst, the reaction conditions, the feed rates, the yield of 1, 4-diacetoxybutane and the selectivity were shown in tables 1 and 2, respectively.

From example 16, which is compared with examples 14 and 15, it can be seen that the hydrogenation catalyst used In the present invention has a better synergistic effect of metal elements In, Ga and V, Nb In the group IIIA metals and the group VB metals In terms of improving the yield and selectivity of 1, 4-diacetoxybutane.

TABLE 1

TABLE 2

Claims (7)

1. A method for preparing 1, 4-diacetoxybutane comprises the steps of carrying out hydrogenation reaction on hydrogen and 1, 4-diacetoxybutene in the presence of a catalyst to obtain 1, 4-diacetoxybutane; the catalyst comprises a carrier and an active component, wherein the carrier is activated carbon, the active component comprises Pt element and a promoter element, and the promoter element comprises at least one metal element selected from VB group metals; the content of Pt element in the catalyst is 1.00-8.60 g/L; the content of the promoter element in the catalyst is 0.50-10.00 g/L.

2. The method according to claim 1, wherein the activated carbon is at least one of coal columnar carbon, coconut shell activated carbon, apricot shell activated carbon, and bamboo activated carbon.

3. The method according to claim 1, wherein the activated carbon has a specific surface area of 1000 to 1500m²The volume of the adsorption holes is 0.60-1.00 cm³/g。

4. The method according to claim 1, wherein said catalyst contains at least one group VB metal selected from the group consisting of V, Nb and Ta.

5. The production method according to any one of claims 1 to 4, wherein the production process of the catalyst comprises the steps of:

① mixing the solution containing platinum element with the carrier according to the composition of the catalyst to obtain a catalyst precursor I;

② aging the catalyst precursor I to obtain a catalyst precursor II;

③ reducing the combined platinum element in the catalyst precursor II into simple substance platinum to obtain a catalyst precursor III;

④ washing with water, drying to obtain catalyst precursor IV;

⑤ according to the composition of the catalyst, the solution containing the promoter element is loaded on the catalyst precursor IV by adopting an impregnation method, and the catalyst is obtained by drying.

6. The process according to any one of claims 1 to 4, wherein the hydrogenation reaction is carried out at a temperature of 20 to 120 ℃.

7. The process according to any one of claims 1 to 4, wherein the pressure of the hydrogenation reaction is 1.0 to 10.0 MPa.