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Supported catalyst for synthesizing 2,2-dimethyl-3-hydroxypropanal and application thereof

A technology of a supported catalyst and hydroxypropionaldehyde, which is applied in the field of preparation technology for synthesizing 2,2-dimethyl-3-hydroxypropionaldehyde, can solve the problems of unsuitable industrial application, high cost, low catalytic efficiency and the like, and achieves the The conversion rate and selectivity can be adjusted, the selectivity is high, and the effect of saving energy

Inactive Publication Date: 2018-03-23
TANGSHAN ZHONGRONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the synthetic catalyst of HPA in the prior art, and its conversion rate is low, side reaction is many, or though side reaction is few, conversion rate is high but selectivity is low, or cost is expensive, and catalytic efficiency is not high , not suitable for industrial applications, etc.

Method used

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  • Supported catalyst for synthesizing 2,2-dimethyl-3-hydroxypropanal and application thereof
  • Supported catalyst for synthesizing 2,2-dimethyl-3-hydroxypropanal and application thereof

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preparation example Construction

[0039] The present invention also discloses the preparation method of the supported catalyst for synthesizing 2,2-dimethyl-3-hydroxypropanal, including:

[0040] Step S1: making one or more of alkali metal hydroxides, carbonates, and fluorides into an aqueous solution of a certain concentration; the alkali metal hydroxides, carbonates, and fluorides described in step S1 One or more of NaOH, Na 2 CO 3 , KOH, K 2 CO 3 One or more of , KF and NaF, the concentration of the aqueous solution is 1-30% by mass fraction, preferably 10-20%.

[0041] Step S2: Add the aqueous solution prepared in step S1 dropwise to the carrier γ-Al at a certain temperature 2 o 3 and perform homogenization operation to obtain γ-Al adsorbed with one or more aqueous solutions of alkali metal hydroxides, carbonates, and fluorides 2 o 3 solid particles; carrier γ-Al 2 o 3 Refers to γ-Al 2 o 3 Small balls, particle size 1~5mm, specific surface area 200~600m 2 / g; or γ-Al 2 o 3 Cylindrical, diamet...

Embodiment 1

[0048] Embodiment 1: the preparation of catalyst Cat-1

[0049] Use particles with a particle size of 2-3mm and a specific surface area of ​​about 350-400m 2 / g γ-Al 2 o 3 100g of pellets is used as a carrier, and a KOH aqueous solution with a mass fraction of 1% is prepared, and the aqueous solution is added dropwise to γ-Al at 90°C 2 o 3 On the carrier, stir for 1 hour while absorbing. The volume of solution used was 70 mL. Then the γ-Al adsorbed KOH aqueous solution 2 o 3 The particles were dried overnight in an oven at 120°C. Then the dried γ-Al 2 o 3 The particles are calcined in a muffle furnace. The calcining procedure is to raise the temperature to 300°C at a rate of 5°C / min from room temperature, then keep the temperature for 4h, and then cool to room temperature to obtain γ-Al 2 o 3 Supported catalyst, spare; and labeled as Cat-1, with a loading of 0.7%.

Embodiment 2

[0050] Embodiment 2: the preparation of catalyst Cat-2

[0051] Use particles with a particle size of 3-4mm and a specific surface area of ​​about 550-600m 2 / g γ-Al 2 o 3 100 g of pellets are used as the carrier. Prepare Na with a mass fraction of 30% 2 CO 3 aqueous solution, the aqueous solution was added dropwise to γ-Al at 40°C 2 o 3 On the carrier, the volume of the solution used was 65 mL when it was stirred for 2 hours while adsorbing. Then the adsorbed Na 2 CO 3 γ-Al in aqueous solution 2 o 3 The particles were dried overnight in an oven at 100°C. Then the dried γ-Al 2 o 3 The particles are roasted in a muffle furnace. The roasting procedure is to raise the temperature from room temperature to 700 °C at a rate of 10 °C / min, then keep it for 6 hours, and then cool down to obtain γ-Al 2 o 3 Supported catalyst, spare; and labeled Cat-2, 19.5% loading.

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Abstract

Theinvention relates to a supported catalyst for synthesizing 2,2-dimethyl-3-hydroxypropanal. The supported catalyst is characterized by comprising active components and a carrier, wherein the activecomponents comprise one or more of alkali metal hydroxide, carbonate and fluoride, the carrier is Gamma-Al2O3, and with carrier mass as a reference, the load amount of the active components accounts for 0.5-20% of the weight of the carrier. A certain molar ratio of formaldehyde and isobutyraldehyde are used as the raw material, the supported catalyst for synthesizing 2,2-dimethyl-3-hydroxypropanalis adopted, the reaction is conducted through a continuation method, the operations are simple, the reaction conditions are mild, the reaction temperature is low, less energy is consumed, the conversion rate and selectivity are adjustable, and industrial requirements on preparation and synthesis of 2,2-dimethyl-3-hydroxypropanal with formaldehyde and isobutyraldehyde are met.

Description

technical field [0001] The invention relates to a supported catalyst and a preparation method for synthesizing 2,2-dimethyl-3-hydroxypropanal, and a preparation process for synthesizing 2,2-dimethyl-3-hydroxypropanal. Background technique [0002] 2,2-Dimethyl-3-hydroxypropionaldehyde (HPA for short) is an important organic compound, an intermediate of calcium pantothenate, a vitamin drug, and an intermediate of neopentyl glycol, an important chemical raw material. Neopentyl glycol is an important fine chemical product, which is widely used in the production of various resins, plasticizers, synthetic lubricants and surfactants. At present, the preparation of 2,2-dimethyl-3-hydroxypropionaldehyde at home and abroad mainly uses formaldehyde and isobutyraldehyde under the condition of catalyst. [0003] For example, CN101863747B discloses a method for preparing 2,2-dimethyl-3-hydroxypropanal, and the basic catalyst is trimethylamine or triethylamine. CN105085212A discloses a ...

Claims

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Application Information

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IPC IPC(8): B01J23/04B01J27/232B01J27/08B01J35/08B01J35/02B01J35/10C07C45/75C07C47/19
CPCC07C45/75B01J23/04B01J27/08B01J27/232B01J35/51B01J35/617B01J35/40B01J35/615C07C47/19
Inventor 代淑梅吴超勇蔡宁
Owner TANGSHAN ZHONGRONG TECH CO LTD
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