Catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate

A technology of dialkyl adipate and hexanediol, which is applied in the field of catalytic chemistry and can solve problems such as high hydrogen/ester molar ratio, limitations of preparation methods, and high reaction pressure

Inactive Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the Cu catalyst prepared by the prior art is used in the hydrogenation of dialkyl adipate to prepare 1,6-hexanediol, which has

Method used

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  • Catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate
  • Catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate
  • Catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 73.6 grams of aluminum nitrate nonahydrate, prepare a solution with a concentration of 0.6M, stir evenly, transfer to a three-necked flask, and heat to 65°C. The aluminum nitrate solution was neutralized with 25% ammonia water, the pH value of the end point was controlled to be 8.6, the obtained gel was aged for 4 hours, filtered with suction, washed, dried at 90° C. and then used for later use.

[0028] Weigh 60.4 grams of copper nitrate trihydrate, 220.4 grams of zinc nitrate hexahydrate, and 41.1 grams of 50% manganese nitrate solution, and prepare a solution with a concentration of 0.6M, which is solution I; weigh 129.1 grams of sodium carbonate, and prepare a solution with a concentration of 1.0 The solution of M is solution II. Place the prepared alumina precursor in the bottom liquid, heat it to 75°C, add solution I and solution II dropwise in parallel, control the end point pH value at about 7.0, age the obtained slurry for 3 hours, filter, wash, and heat ...

Embodiment 2

[0030]Weigh 132.4 grams of aluminum nitrate nonahydrate, prepare a solution with a concentration of 0.6M, stir evenly, transfer to a three-necked flask, and heat to 65°C. The aluminum nitrate solution was neutralized with 25% ammonia water, the pH value of the end point was controlled to be 8.6, the obtained gel was aged for 4 hours, filtered with suction, washed, dried at 90° C. and then used for later use.

[0031] Weigh 60.4 grams of copper nitrate trihydrate, 220.4 grams of zinc nitrate hexahydrate, and 8.2 grams of 50% manganese nitrate solution, and prepare a solution with a concentration of 0.6M, which is solution I; weigh 118.4 grams of sodium carbonate, and prepare a solution with a concentration of 1.0 The solution of M is solution II. Put the prepared alumina precursor in the bottom liquid, heat it to 75°C, add solution I and solution II dropwise in parallel, control the end point pH value at about 7.0, and age the obtained slurry for 3 hours, filter, wash, and heat...

Embodiment 3

[0033] Weigh 110.3 grams of aluminum nitrate nonahydrate, prepare a solution with a concentration of 0.6M, stir evenly, transfer to a three-necked flask, and heat to 65°C. The aluminum nitrate solution was neutralized with 25% ammonia water, the pH value of the end point was controlled to be 8.6, the obtained gel was aged for 4 hours, filtered with suction, washed, dried at 90° C. and then used for later use.

[0034] Weigh 60.4 grams of copper nitrate trihydrate, 220.4 grams of zinc nitrate hexahydrate, and 20.6 grams of 50% manganese nitrate solution, and prepare a solution with a concentration of 0.6M, which is solution I; weigh 122.4 grams of sodium carbonate, and prepare a solution with a concentration of 1.0 The solution of M is solution II. Put the prepared alumina precursor in the bottom liquid, heat it to 75°C, add solution I and solution II dropwise in parallel, control the end point pH value at about 7.0, and age the obtained slurry for 3 hours, filter, wash, and he...

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Abstract

The invention relates to a catalyst and method for preparing 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate. The catalyst comprises, by weight, a) 20 to 50 parts of metallic copper or an oxide thereof, b) 30 to 60 parts of metal zinc or an oxide thereof, c) 1 to 20 parts of at least one transition metal or its oxide, and d) 1 to 20 parts of alumina. The desired alumina precursor has a specific surface area of 50 to 500m<2>/g and a total pore volume of 0.3 to 2.0ml/g. The volume of pores having diameters less than 20nm is 40-80% total pore volume. The volume of pores having diameters of 20-90nm is 10-40% total pore volume. The volume of pores having diameters greater than 90nm is 0-16% total pore volume. The catalyst can be used in the industrial production of 1, 6-hexanediol by hydrogenation of dialkyl 1, 6-adipate.

Description

technical field [0001] The invention belongs to the field of catalytic chemistry, in particular to a catalyst and a method for preparing 1,6-hexanediol by hydrogenating 1,6-dialkyl adipate. Background technique [0002] 1,6-Hexanediol is an important fine chemical raw material, mainly used in the production of high-quality polyurethane elastomer resin, polyester plasticizer, UV-curable coating, polycarbonate, pharmaceutical intermediates, lubrication Oil heat stability improver, food additive, etc. 1,6-hexanediol has two terminal hydroxyl groups, and this structure can better participate in the polymerization reaction. At the same time, 1,6-hexanediol has a longer carbon chain, which can effectively improve the mechanical strength of the polymer. In terms of dyes and polyesters, 1,6-hexanediol improves the color and adsorption capacity of products, and has good light stability. 1,6-hexanediol is also widely used in the production of polyurethane, which can effectively impr...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/80B01J23/83B01J35/10C07C31/20C07C29/149
Inventor 徐晓清刘仲能涂云宝朱瑾
Owner CHINA PETROLEUM & CHEM CORP
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