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Catalyst and method for preparing 1,5 pentanediol by hydrogenation of 1,5 dimethyl glutarate

A dimethyl glutarate and catalyst technology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of increased production costs, increased pressure requirements for reaction equipment, and increased operational difficulty, etc. problems, to achieve the effect of reducing pressure requirements, reducing one-time investment and production costs, and reducing difficulty

Inactive Publication Date: 2005-01-19
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, in the method for preparing 1,5-pentanediol, the common problem is that the pressure of the catalytic hydrogenation reaction is generally very high, which inevitably increases the pressure requirements of the reaction equipment, which will correspondingly make the production The one-time investment of the device increases, the production cost increases, and the operation difficulty in production will also be increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 182.1 grams of copper nitrate (Cu(NO 3 ) 2 ·3H 2 O), 73 grams of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 147 grams of aluminum nitrate (Al(NO 3 ) 3 9H 2 O) Dissolve in 800 ml of distilled water. Under heating and stirring, it is neutralized with alkaline solution sodium hydroxide to PH = 7, and a precipitate is formed at the same time. After filtering and washing, it is dried at 120°C for 5 hours, calcined at 400°C for 4 hours, and formed. The catalyst was reduced in a hydrogen stream at 300°C for 4 hours before use.

Embodiment 2

[0017] Put 85.6 grams of copper chloride (CuCl 2 2H 2 O), 83.7 grams of zinc chloride (ZnCl 2 ), and 73.5 grams of aluminum nitrate (Al(NO 3 ) 3 9H 2 O) Dissolve in 800 ml of distilled water. Under heating and stirring, it is neutralized with alkaline solution sodium carbonate to PH = 7, and a precipitate is formed at the same time. After filtering and washing, it is dried at 120°C for 5 hours, calcined at 400°C for 4 hours, and formed. The catalyst code is DLW-66. The catalyst was reduced in a hydrogen stream at 300°C for 4 hours before use.

Embodiment 3

[0019] Put 151.8 grams of copper nitrate (Cu(NO 3 ) 2 ·3H 2 O), 127.9 grams of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) and 39.2 grams of aluminum chloride (AlCl 3 ) was dissolved in 800 ml of distilled water. Under heating and stirring, it is neutralized to PH=7 with alkali solution and ammonia water, and a precipitate is formed at the same time. After filtering and washing, it is dried at 120°C for 5 hours, and calcined at 400°C for 4 hours to form a shape. The catalyst was reduced in a hydrogen stream at 300°C for 4 hours before use.

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PUM

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Abstract

The invention relates to a catalyst for hydrogenation preparation of 1,5-pentanediol by 1,5-dimethyl glutarate and its preparation method. The catalyst consists of active component copper oxide, aid zinc oxide and alumina, in which, copper oxide is 40 to 60% by weight, zinc oxide is 20 to 50% by weight and alumina is 10 to 20% by weight. The preparation process comprises the following steps: soluble salts of copper, zinc and aluminum are mixed by weight and dissolved by water, and pH value is adjusted to 7 by aqueous alkali in the process of heating and stirring, precipitate is filtered, washed, dried and baked, and then the catalyst is obtained.

Description

[0001] Field [0002] The invention relates to a catalyst for hydrogenating 1,5-pentanedioic acid dimethyl ester to produce 1,5-pentanediol, a preparation method and application thereof. Background technique [0003] 1,5-Pentanediol is a colorless viscous liquid, mainly used as a raw material for new polyesters, coatings, adhesives, sealants and plasticizers. [0004] At present, the production methods of 1,5-pentanediol in the prior art include: 1) using tetrahydrofurfuryl alcohol as a raw material and preparing it through catalytic hydrogenation. The reaction temperature is 300-330°C, and the reaction pressure is 22-42Mpa; 2) Cyclopentadiene is photooxidized to obtain epoxypentenal, and then hydrogenated at 70-100°C under a pressure of about 6MPa to obtain 1,5- pentylene glycol. [0005] In U.S. Patent USP 6037504, it is provided to use α, ω-dibasic acid (carbon number 4-12) to generate corresponding dibasic ester through esterification; Then generate corresponding α throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/825B01J37/08B01J37/16C07C29/149C07C31/20
Inventor 林培滋李民丁云杰黄集钺黄世煜曹微程显波刘景凤
Owner PETROCHINA CO LTD
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