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Catalyst for preparation of 1,6-hexanediol by hydrogenating 1,6-hexanedioic acid dialkyl ester and preparation method and application thereof

A dialkyl adipate and catalyst technology, which is applied in the preparation of hydroxyl compounds, metal/metal oxide/metal hydroxide catalysts, molecular sieve catalysts, etc., can solve problems such as poor thermal stability, high catalyst cost, and high reaction pressure problem, to achieve the effect of increasing liquid hourly space velocity, simple preparation process, and reducing hydrogen-ester ratio

Active Publication Date: 2012-03-21
SHANGHAI WUZHENG ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above disclosed patents basically use copper as the main catalyst and are prepared by co-precipitation method, which has the disadvantages of high reaction pressure, small space velocity, large hydrogen-ester ratio, and poor thermal stability.
There are also a small number of hydrogenation catalysts that are noble metal catalysts, and the cost of catalysts is relatively high

Method used

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  • Catalyst for preparation of 1,6-hexanediol by hydrogenating 1,6-hexanedioic acid dialkyl ester and preparation method and application thereof
  • Catalyst for preparation of 1,6-hexanediol by hydrogenating 1,6-hexanedioic acid dialkyl ester and preparation method and application thereof
  • Catalyst for preparation of 1,6-hexanediol by hydrogenating 1,6-hexanedioic acid dialkyl ester and preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0041] 2. Preparation of catalyst

[0042] Weigh a certain amount of the above-mentioned carriers respectively, and dry them at 80-120°C; then weigh a certain amount of soluble salts of copper, nickel, and metal additive M according to the ratio of each component in the catalyst, and you can choose nitrate and acetate etc.; and configured as an aqueous solution, the total concentration of solute contained in the solution is 10-30%wt, and a saturated solution is recommended; the carrier is immersed in the above metal solution according to the loading capacity, and the precursor is obtained after drying.

[0043] Configure a certain concentration of KBH 4 or NaBH 4 Solution, pH value 7-12, concentration 1-10mol / L. Add the solution dropwise to the precursor, and stir in a constant temperature water bath at 25-75°C. After no hydrogen is released, the reaction ends. Wash with distilled water until the conductivity of the filtrate is less than 100 μs / cm. The catalyst precursor ...

Embodiment 1

[0051] Effect of catalysts prepared with different supports on the hydrogenation of dimethyl adipate to hexanediol. The activity and selectivity of the catalysts were evaluated in a micro fixed bed reactor. The catalyst powder is granulated to 40-100 mesh, and the loading amount is 5g.

[0052] table 3

[0053]

[0054]

Embodiment 2

[0056] Effect of Metal Additive M on the Hydrogenation of Dimethyl Adipate to Hexylene Glycol. The activity and selectivity of the catalysts were evaluated in a micro fixed bed reactor. The catalyst powder is granulated to 40-100 mesh, and the loading amount is 5g.

[0057] Table 4

[0058]

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Abstract

The invention provides a catalyst for preparation of 1,6-hexanediol by hydrogenating 1,6-hexanedioic acid dialkyl ester and a preparation method and application thereof. The catalyst comprises, by weight, 5%-30% of Cu, 2-10% of Ni, 5%-20% of B, 0%-5% of metallic addition and the balance being a porous carrier. Since the catalyst is applied to reaction for preparation of hexanediol by hydrogenating 1,6-hexanedioic acid dialkyl ester, pressure during reaction can be reduced effectively, the liquid hourly space velocity is increased and H2-to-ester ratio is lowered.

Description

technical field [0001] The invention relates to a catalyst for preparing 1,6-hexanediol through hydrogenation of dialkyl 1,6-adipate, a preparation method and application thereof. Background technique [0002] 1,6-Hexanediol is a white solid at room temperature, with a melting point of 43°C and a boiling point of 250°C. It is soluble in water and ethanol, slightly soluble in hot ether, and insoluble in benzene. 1,6-Hexanediol is mainly used in the production of polyurethane, unsaturated polyester, coatings, adhesives, hardeners for plasticizers, and thermal stability improvers for lubricating oils. [0003] Modification of polyurethane elastomers with 1,6-hexanediol. The modified resin has excellent mechanical strength, water resistance, heat resistance and oxidation resistance. In the field of polyester: Since the carbon chain of 1,6-hexanediol unsaturated polyester is more difficult to hydrolyze than unsaturated polyester of other short-chain alcohols, and has better fle...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J23/80B01J23/889B01J29/00C07C31/20C07C29/149
Inventor 王保明李玉江徐长青王东辉
Owner SHANGHAI WUZHENG ENG TECH CO LTD
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